RP506K NISSHINBO | Alldatasheet

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2 A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

No.EA-296-210909 OUTLINE The RP506K is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous rectifier featuring 2 A(1) output current. Internally, a single converter consists of an oscillator, a reference voltage unit, an error am plifier, a switching control c ircuit, a mod e control c ircuit, a s oft start circui t, a latch type protection circuit, an under-voltage lockout (UVLO) circuit, a thermal shutdown circuit, and switching transistors. The RP506K is employing synchronous rectificati on for improv ing the efficiency of rectificati on by replacing diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance but also allows a design to reduce parts count. Power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control type by i nputting a signal to t he MODE p in. In low out put current, f orced PWM control s witches at f ixed frequency r ate in order t o reduce noise. Likewise, i n low o utput current, PWM/VFM auto switching control automatically switches from PWM mode to VFM mode in order to achieve high efficiency. Output voltage type can be selected from an internally fix ed output voltage type (RP506Kxx1A/B/D/E) or an externally adjustable output voltage type (RP506K001C/F). The output voltage of the RP506Kxx1A/B/D/E can be set by 0.1 V step and the output voltage accuracy is as high as ±1.5% or ±18 mV. The output voltage of the RP506K001C/F can be set by using the external resistors. Oscillator frequency can be selected from 2.25 MHz (RP506Kxx1A/B/C) or 1.2 MHz (RP506Kxx1D/E/F). Soft- start time is Typ. 0.15 ms, and by connecting an external capacitor to the TSS pin, soft-start time is adjustable. Power good (PG) function monitors the VOUT pin voltage or the feedback pi n voltage (VFB), and switches the PG pin to low if any abnormal condition is detected. Protection circuits included in the RP506K are over c urrent protection circuit, latch type protection circuit and thermal shutdown circuit. Over current protection circuit supervises the inductor peak current in each switching cycle, and if t he current exceeds the L X current limit (I LXLIM), it turns off Pc h T r. Latc h type protection circuit latches the built-in driver to t he OFF stat e and stops t he operation of the step- down DC/DC converter if the over current status continues or VOUT continues being the half of t he setting voltage for equal or longer than protection delay time (tprot). Thermal shut down circuit detects overheating of the converter if the output pin is shorted to the ground pin (GND) etc. and stops the converter operation to protect it from damage if the junction temperature exceeds the specified temperature. The RP506K is available in DFN(PL)2527-10 which achieves high-density mounting on boards. (1) This is an approximate value. The output current is dependent on conditions and external components.

No.EA-296-210909

FEATURES

 Output Voltage Range(1) ·················· Fixed output voltage type (RP506Kxx1A/B/D/E) : to 3.3 V by 0.1 V step Adjustable output voltage type (RP506K001C/F) : to 4.0 V Version Forced PWM Control PWM/VFM Auto Switching Control RP506Kxx1A/B 1.1 V to 3.3 V 0.8 V to 3.3 V RP506K001C 1.1 V to 4.0 V 0.8 V to 4.0 V RP506Kxx1D/E 0.6 V to 3.3 V RP506K001F 0.6 V to 4.0 V  Output Voltage/Feedback Voltage  Inductor C  Package· APPLICATION  Power source for Li-ion battery-used equipment  Power source for portable communication equipment, camcorder, DSC, Notebook PC  Power source for HDD, WLAN (1) Refer to Selection Guide for detailed information. (2) VSET = Set Output Voltage

No.EA-296-210909 SELECTION GUIDE The set output voltage, the output voltage type, the auto-discharge function(1), and the oscillator frequency for the ICs are user-selectable options. Sel ection Guide Product Name Package Quantity per Reel Pb Free Halogen Free RP506Kxx1$(y)-TR DFN(PL)2527−10 5,000 pc s Yes Yes xx: Designation of the set output voltage (VSET)(2) For Fixed Output Voltage Type(3): 0.6 V to 3.3 V in 0.1 V steps For Adjustable Output Voltage Type: 00 only (y) : If VSET includes the 3rd digit, indicate the digit of 0.01 V. (1.25 V) Ex. If VSET is 1.25 V, RP506K121$5-TR. $: D esignation of Version Version Output Voltage Type Auto-discharge Function Oscillator Frequency VSET Forced PWM PWM/VFM Auto Switching RP506Kxx1A Fixed No

2.25 MHz

1.1 V to 3.3 V 0.8 V to 3.3 V RP506Kxx1B Yes RP506K001C Adjustable No 1.1 V to 4.0 V 0.8 V to 4.0 V RP506Kxx1D Fixed

1.2 MHz

0.6 V to 3.3 V RP506Kxx1E Yes RP506K001F Adjustable No 0.6 V to 4.0 V (1) Auto-discharge function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor. (2) VSET can be set only within the specified range of voltage. Refer to Designation of Version for detailed information. (3) 0.05 V step is also available as a custom code.

No.EA-296-210909 BLOCK DIAGRAM CE PVIN AGND LX Chip Enable Ramp Compensation Current Feedback Current Detector Switching Control UVLO OSC Vref VOUT Mode Control Soft Start PGND MODE Thermal Protection AVIN TSS (“L” during Soft Start) PG Over /Under Voltage Detection OVD UVD RP506Kxx1A/D Block Diagram CE PVIN AGND LX Chip Enable Ramp Compensation Current Feedback Current Detector Switching Control UVLO OSC Vref VOUT Mode Control Soft Start PGND MODE Thermal Protection AVIN TSS (“L” during Soft Start) PG Over /Under Voltage Detection OVD UVD RP506Kxx1B/E Block Diagram

No.EA-296-210909 CE PVIN AGND LX Chip Enable Ramp Compensation Current Feedback Current Detector Switching Control UVLO OSC Vref VFB Mode Control Soft Start PGND MODE Thermal Protection AVIN TSS (“L” during Soft Start) PG Over /Under Voltage Detection OVD UVD RP506K001C/F Block Diagram

No.EA-296-210909 PIN DESCRIPTION Bottom View Top View 6 10 7 8 9 5 1 4 3 2 10 6 9 8 7 1 5 2 3 4 DFN(PL)2527-10 Pin Configurations DFN(PL)2527-10 Pin Description Pin N o. Symbol Description

1 PVIN PVIN Input Voltage Pin(1)

2 AVIN AVIN Input Voltage Pin(1)

3 PG Power Good Pin

4 CE Chip Enable Pin (Active “H”)

5 MODE

(“H”: forced PWM control, “L”: PWM/VFM auto switching control)

6 TSS Soft-start Pin

7 VOUT/ VFB Output/ Feedback Voltage Pin

8 AGND Analog Ground Pin(2)

9 LX Switching Pin

10 PGND Power Ground Pin(2)

∗ The tab on the bottom of the package enhances thermal performance and is electrically connected to GND (substrate level). It is recommended that the tab be connected to the ground plane on the board, or otherwise be left floating. (1) No.1 pin and No.2 pin must be wired to the VIN plane when mounting on boards. (2) No.8 pin and No.10 pin must wired to the GND plane when mounting on boards.

No.EA-296-210909 ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings (AGND = PGND = 0 V) Symbol Item Rating Unit VIN A/PVIN Pin Voltage −0.3 to 6.5 V VLX LX Pin Voltage −0.3 to A/PVIN +0.3 V VCE CE Pin Voltage −0.3 to 6.5 V VOUT/VFB VOUT/VFB Pin Voltage −0.3 to 6.5 V VMODE MODE Pin Voltage −0.3 to 6.5 V VPG PG Pin Voltage −0.3 to 6.5 V VTSS TSS Pin Voltage −0.3 to AVIN+0.3 V ILX LX Pin Output Current 2.8 A PD Power Dissipation(1) Standard Land Pattern 910 mW High Wattage Land Pattern 1400 mW Tj Junction Temperature −40 to 125 °C Tstg Storage Temperature Range −55 to 125 °C ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause permanent damage and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings are not assured. RECOMMENDED OPERATING CONDITIONS Recommended Operating Conditions Symbol Item Rating Unit VIN Input Voltage 2.5 to 5.5 V Ta Operating Temperature Range −40 to 85 °C RECOMMENDED OPERATING CONDITIONS All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions , even if they are used ov er such ratings by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. (1) Refer to PACKAGE INFORMATION for detailed information.

No.EA-296-210909

ELECTRICAL CHARACTERISTICS

RP506Kxx1 Electrical Characteristics (Ta = 25°C) Symbol Item Conditions Min. Typ. Max. Unit Istandby Standby Current A/PVIN = 5.5 V, VCE = 0 V 0 5 µA ICEH CE “H” Input Current A/PVIN = VCE = 5.5 V −1 0 1 µA ICEL CE “L” Input Current A/PVIN = 5.5 V, VCE = 0 V −1 0 1 µA IMODEH MODE “H” Input Current A/PVIN = VMODE = 5.5 V, VCE = 0 V −1 0 1 µA IMODEL MODE “L” Input Current A/PVIN = 5.5 V, VCE = VMODE = 0 V −1 0 1 µA ILXLEAKH LX Leakage Current “H” A/PVIN = VLX = 5.5 V, VCE = 0 V −1 0 6 µA ILXLEAKL LX Leakage Current “L” A/PVIN = 5.5 V, VCE = VLX = 0 V −6 0 1 µA VCEH CE “H” Input Voltage A/PVIN = 5.5 V 1.0 V VCEL CE “L” Input Voltage A/PVIN = 2.5 V 0.4 V VMODEH MODE “H” Input Voltage A/PVIN = 5.5 V 1.0 V VMODEL MODE “L” Input Voltage A/PVIN = 2.5 V 0.4 V RONP On Resistance of Pch Transistor A/PVIN = 3.6 V, ILX = −100 mA 0.130 Ω RONN On Resistance of Nch Transistor A/PVIN = 3.6 V, ILX = −100 mA 0.125 Ω Maxduty Maximum Duty Cycle 100 % tstart1 Soft-start Time 1 A/PVIN = VCE = 3.6 V or VSET +1 V, TSS = OPEN 150 300 µs tstart2 Soft-start Time 2 A/PVIN = VCE = 3.6 V or VSET +1 V, CSS = 0.1 µF 15 30 45 ms ILXLIM LX Current Limit A/PVIN = VCE = 3.6 V or VSET +1 V 2300 2800 mA tprot Protection Delay Time A/PVIN = VCE = 3.6 V or VSET +1 V 0.5 1.5 5 ms VUVLO1 UVLO Detector Threshold A/PVIN = VCE 2.1 2.2 2.3 V VUVLO2 UVLO Released Voltage A/PVIN = VCE 2.2 2.3 2.4 V TTSD Thermal Shutdown Temperature Junction Temperature 150 °C TTSR Thermal Shutdown Released Temperature Junction Temperature 100 °C RPG On Resistance of PG Pin When Low Output A/PVIN = 3.6 V, VOUT = 0 V or VFB = 0 V 45 Ω

No.EA-296-210909 ELECTRICAL CHARACTERISTICS (continued) RP506Kxx1A/B, RP506K001C (Oscillator Frequency: 2.25 MHz) Electrical Characteristics (Ta = 25°C) Symbol Item Conditions Min. Typ. Max. Unit VIN When MODE = H Operating Input Voltage(1) 1.1 V ≤ VSET < 1.2 V 2.5 4.5 V 1.2 V ≤ VSET 2.5 5.5 When MODE = L Operating Input Voltage(2) 0.8 V ≤ VSET < 1.0 V 2.5 4.5 1.0 V ≤ VSET 2.5 5.5 fosc Oscillator Frequency A/PVIN = VCE = 3.6 V or VSET +1 V 2.00 2.25 2.50 MHz RP506Kxx1D/E, RP506K001F (Oscillator Frequency: 1.2 MHz) Electrical Characteristics Symbol Item Conditions Min. Typ. Max. Unit VIN When MODE = H Operating Input Voltage 0.6 V ≤ VSET < 0.7 V 2.5 4.5 V 0.7 V ≤ VSET 2.5 5.5 When MODE = L Operating Input Voltage 0.6 V ≤ VSET 2.5 5.5 fosc Oscillator Frequency A/PVIN = VCE = 3.6 V or VSET +1 V 1.00 1.20 1.40 MHz (1) As for RP506Kxx1A/B/C (MODE = H), VSET can be set from 1.1 V. (2) As for RP506Kxx1A/B/C (MODE = L), VSET can be set from 0.8 V.

No.EA-296-210909 ELECTRICAL CHARACTERISTICS (continued) RP506Kxx1A/B/D/E (Fixed Output Voltage Type) Electrical Characteristics (Ta = 25°C) Symbol Item Conditions Min. Typ. Max. Unit VOUT Output Voltage A/PVIN = VCE = 3.6 V or VSET +1 V VSET ≥ 1.2 V x0.985 x1.015 V VSET < 1.2 V −0.018 +0.018 ∆VOUT /∆Ta Output Voltage Temperature Coefficient −40°C ≤ Ta ≤ 85°C ±100 ppm /°C IDD1 Supply Current 1 A/PVIN = VCE = 5.5 V, VOUT = VSET ×0.8 600 µA IDD2 Supply Current 2 A/PVIN = VCE = VOUT = 5.5 V VMODE = 0 V 48 72 µA VMODE = 5.5 V 600 µA IVOUTL VOUT “L” Current A/PVIN = 5.5 V, VCE = VOUT = 0 V −1 0 1 µA VOVD OVD Voltage A/PVIN = 3.6 V VSET ×1.2 V VUVD UVD Voltage A/PVIN = 3.6 V VSET ×0.8 V RP506Kxx1A/D (Fixed Output Voltage Type without Auto-discharge Function) IVOUTH VOUT “H” Current A/PVIN = VOUT = 5.5 V, VCE = 0 V −1 0 1 µA RP506Kxx1B/E (Fixed Output Voltage Type with Auto-discharge Function) RLOW On Resistance of Low Output A/PVIN = 3.6 V, VCE = 0 V 45 Ω RP506K001C/F (Adjustable Output Voltage Type) Electrical Characteristics VFB Feedback Voltage A/PVIN = VCE = 3.6 V 0.591 0.600 0.609 V ∆VFB /∆Ta Feedback Voltage Temperature Coefficient −40°C ≤ Ta ≤ 85°C ±100 ppm /°C IDD1 Supply Current 1 A/PVIN = VCE = 5.5 V, VFB = 0.48 V 600 µA IDD2 Supply Current 2 A/PVIN = VCE = VFB = 5.5 V VMODE = 0 V 48 72 µA VMODE = 5.5 V 600 µA IVFBH VFB “H” Current A/PVIN = VFB = 5.5 V, VCE = 0 V −1 0 1 µA IVFBL VFB “L” Current A/PVIN = 5.5 V, VCE = VFB = 0 V −1 0 1 µA VOVD OVD Voltage A/PVIN = 3.6 V 0.72 V VUVD UVD Voltage A/PVIN = 3.6 V 0.48 V All test items listed under Electrical Characteristics are done under the pulse load condition (Tj ≈ Ta = 25°C) except Output Voltage Temperature Coefficient and Feedback Voltage Temperature Coefficient.

No.EA-296-210909 ELECTRICAL CHARACTERISTICS (continued) Product Name Output Voltage (VOUT) [V] Min. Typ. Max. RP506K061x 0.582 0.600 0.618 RP506K071x 0.682 0.700 0.718 RP506K081x 0.782 0.800 0.818 RP506K091x 0.882 0.900 0.918 RP506K101x 0.982 1.000 1.018 RP506K111x 1.082 1.100 1.118 RP506K121x 1.182 1.200 1.218 RP506K131x 1.281 1.300 1.319 RP506K141x 1.379 1.400 1.421 RP506K151x 1.478 1.500 1.522 RP506K161x 1.576 1.600 1.624 RP506K171x 1.675 1.700 1.725 RP506K181x 1.773 1.800 1.827 RP506K191x 1.872 1.900 1.928 RP506K201x 1.97 2.000 2.03 RP506K211x 2.069 2.100 2.131 RP506K221x 2.167 2.200 2.233 RP506K231x 2.266 2.300 2.334 RP506K241x 2.364 2.400 2.436 RP506K251x 2.463 2.500 2.537 RP506K261x 2.561 2.600 2.639 RP506K271x 2.66 2.700 2.74 RP506K281x 2.758 2.800 2.842 RP506K291x 2.857 2.900 2.943 RP506K301x 2.955 3.000 3.045 RP506K311x 3.054 3.100 3.146 RP506K321x 3.152 3.200 3.248 RP506K331x 3.251 3.300 3.349 RP506K121x5 1.232 1.250 1.268

No.EA-296-210909 THEORY OF OPERATION Soft-start Time Adjustment Function Soft-start time (tstart) of the RP506K is adjustable by connecting a soft-start time adjustment capacitor (C SS) connected, tstart will be 30 ms. The TSS pin must be open if the soft -start time function is not used. tstart is set to 0.15 ms (Typ.) when the TSS pin is open. tstart 30ms 15ms 3ms 0.15ms 0 470pF 0.01μF 0.047μF 0.1μF CSS CSS vs. tstart (Typ.) Soft-start Time (tstart) vs. Soft-start Time Adjustment Capacitor (CSS) Power Good Function The RP506K contains a power good function using Nch open drain. If any abnormal condition is detected, the power good function turns Nch transistor on and switches the PG pin to low. If the cause of the abnormal condition is removed, the power good function turns Nch transistor off and switches the PG pin back to high. After the recovery from abnormal condition, it takes typically 0.05 ms for the IC to turns Nch transistor off. The followings are the abnormal conditions that the power good function can detect.

  • CE = ”L” (Shut down)
  • UVLO (Shut down)
  • Thermal Shutdown
  • O ver Voltage Detection: Typ. VSET x 1.2 V (RP506Kxx1A/B/D/E) or 0.72 V (RP506K001C/F)
  • Under Voltage Detection: Typ. VSET x 0.8 V (RP506Kxx1A/B/D/E) or 0.48 V (RP506K001C/F)
  • Latch Type Protection Notes: When using the power good function, the resistance of PG pin (R PG) should be between 10 kΩ to 100 kΩ. The PG pin must be open or connected to GND if the power good function is not used.

No.EA-296-210909 Sequential Start-Up Using Soft-Start Time Adjustment and Power Good Functions Sequential startup circuits can be built by using soft -start time adjustment and power good functions of the RP506K. The figure below is an example of sequential startup circuits using DC/DC1 and DC/DC2. The DC/DC1 starts up first followed by the DC/DC2: the output of DC/DC1 reaches 1.44 V (VSET x 0.8), the PG pin of DC/DC1 sends a high signal to the CE pin of DC/DC2, and then the DC/DC2 starts soft -start. DC/DC1 (RP506K001C/F): VIN = 5.0 V, VOUT = 1.8 V, tstart = 30 ms (CSS = 0.1 μF) DC/DC2 (RP506K001C/F): VIN = 5.0 V, VOUT = 1.2 V, tstart = 30 ms (CSS = 0.1 μF) PVIN PG PGND Lx VFB AGND VIN = 5.0 V COUT1 30 µF VOUT1 1.8 V 2.2 µH RP506K001C/F AVIN CE TSS MODE RPG1 100 kΩ CIN1 10 µF 440 kΩ 22 pF PVIN PG PGND Lx VFB AGND COUT2 30 µF VOUT2 1.2 V 2.2 µH RP506K001C/F AVIN CE TSS MODE CIN2 10 µF 22 pF DCDC1 DCDC2 220 kΩ 220 kΩ 220 kΩ CSS1 0.1 µF CSS2 0.1 µF Circuits Example using Sequential Startup

No.EA-296-210909 Operation of Step-Down DC/DC Converter and Output Current The step-down DC/DC converter charges energy in the inductor when L X Tr. turns “ON”, and discharges the energy from the inductor when L X Tr. turns “OFF” and controls with less energy loss, so that a lower output voltage (VOUT) than the input voltage (VIN) can be obtained. The operation of the step-down DC/DC converter is explained in the following figures. Pch Tr L Nch Tr VIN VOUT CL GND T＝1/fosc ton toff topen ILmin ILmax IL i1 i2 Basic Circuit Inductor Current (IL) flowing through Inductor (L) Step1. Pch Tr. turns “ON” and IL (i1) flows, L is charged with energy. At this moment, i1 increases from the minimum inductor current (ILmin), which is 0 A, and reaches the maximum inductor current (ILmax) in proportion to the on-time period (ton) of Pch Tr. Step2. When Pch Tr. turns “OFF”, L tries to maintain IL at ILmax, so L turns Nch Tr. “ON” and IL (i2) flows into Step3. i2 decreases gradually and reaches ILmin after the open-time period (topen) of Nch Tr., and then Nch Tr. turns “OFF”. This is called discontinuous current mode. As the output current (IOUT) increases, the off-time period (toff) of Pch Tr. runs out before IL reaches ILmin. The next cycle starts, and Pch Tr. turns “ ON” and Nch Tr. turns “OFF”, which means IL starts increasing from ILmin. This is called continuous current mode. In the case of PWM mode, VOUT is maintained by controlling ton. During PWM mode, the oscillator frequency (fosc) is being maintained constant. When the step-down DC/DC operation is constant, ILmin and ILmax during ton of Pch Tr. would be same as during toff of Pch Tr. The current differential between ILmax and ILmin is described as ∆I. ∆I = ILmax − ILmin = V However, T = 1 / fosc = ton + toff duty (%) = ton / T × 100 = ton × fosc × 100 topen ≤ toff In Equation 1, “V OUT × topen / L” shows the amount of current change in "OFF" state. Also, “(VIN − VOUT) × ton / L” shows the amount of current change at "ON" state.

No.EA-296-210909 Discontinuous Mode and Continuous Mode As illustrated in Figure A, when IOUT is relatively small, t open < toff. In this case, the energy charged into L during ton will be completely discharged during toff, as a result, ILmin = 0. This is called discontinuous mode. When IOUT is gradually increased, eventually topen = toff and when IOUT is increased further, eventually ILmin > 0, as illustrated in Figure B. This is called continuous mode. ILmax ILmin ton toff T=1/fosc topen IL t ILmax ILmin ton toff T=1/fosc IL Iconst t Figure A. Discontinuous Mode Figure B. Continuous Mode In the continuous mode, the solution of Equation 1 is described as tonc. tonc = T × V When ton < tonc, it is discontinuous mode, and when ton = tonc, it is continuous mode.

No.EA-296-210909 Forced PWM Mode By setting the MODE pin to “H”, the IC switches the frequency at the fixed rate to reduce noise even when the output load is light. Therefore, when IOUT is ∆IL/2 or less, ILmin becomes less than 0. That is, the accumulated electricity in CL is discharged through the IC side while IL is increasing from ILmin to 0 during ton, and also while IL is decreasing from 0 to ILmin during toff. ILmax ILmin ton toff T=1/fosc IL IOUT t ΔIL Forced PWM Mode VFM Mode By setting the MODE pin to “L”, in low output current, the IC automatically switches into VFM mode in order to achieve high efficiency. In VFM mode, ton is forced to end when the inductor current reaches the pre-set ILmax. In the VFM mode, ILmax is typically set to 400 mA for the RP506Kxx1A/B/C, and 550 mA for the RP506Kxx1D/E/F. When ton reaches 1.5 times of T = 1 / fosc, ton will be forced to end even if the inductor current is not reached ILmax. ILmax ILmin ton toff IL t VFM Mode

No.EA-296-210909 Output Current and Selection of External Components The following equations explain the relationship between output current and peripheral components that are listed in Table1. Recommended External Components in TYPICAL APPLICATION. Ripple Current P-P value is described as IRP, ON resistance of Pch Tr. is described as RONP, ON resistance of Nch Tr. is described as RONN, and DC resistor of the inductor is described as RL. First, when Pch Tr. is “ON”, the following equation is satisfied. V Second, when Pch Tr. is "OFF" (Nch Tr. is "ON"), the following equation is satisfied. L × I Put Equation 4 into Equation 3 to solve ON duty of Pch Tr. (D ON = ton / (toff + ton)): Ripple Current is described as follows: I Peak current that flows through L, and LX Tr. is described as follows: Notes: Please consider ILxmax when setting conditions of input and output, as well as selecting the external components. The above calculation formulas are based on the ideal operation of the ICs in continuous mode.

No.EA-296-210909 Timing Chart (1) Soft-start Time Starting-up with CE Pin The IC starts to operate when the CE pin voltage (VCE) exceeds the threshold voltage. The threshold voltage is preset between CE “H” input voltage (VCEH) and CE “L” input voltage (VCEL). After the start-of the start-up of the IC, soft -start circuit starts to operate. Then, after a certain period of time, the reference voltage (VREF) in the IC gradually increases up to the specified value. VCEH Soft-start Time IC Internal Reference Voltage VCEL Threshold Level Lx Voltage (VCE) (VREF) Soft-start Circuit operation starts. (VLX) Depending on Power Supply, Load Current, External Components (VOUT) Output Voltage CE Pin Input Voltage IC operates with PWM mode during Soft-start time. Timing Chart Soft-start time starts when soft -start circuit is activated, and ends when the reference voltage reaches the specified voltage. Notes: Soft start time is not always equal to the turn-on speed of the step-down DC/DC converter. Please note that the turn-on speed could be affected by the power supply capacity, the output current, the inductance value and the C OUT value.

No.EA-296-210909 Starting-up with Power Supply After the power-on, when VIN exceeds the UVLO released voltage (VUVLO2), the IC starts to operate. Then, soft- start circuit starts to operate and after a certain period of time, V REF gradually increases up to the specified value. Soft -start time starts when soft -start circuit is activated, and ends when V REF reaches the specified voltage. Output Voltage (VOUT) Input Voltage (VIN) VUVLO2 IC Internal Reference Voltage (VREF) VUVLO1 Lx Voltage (VLX) VSET VSET Depending on Power Supply, Load Current, External Components Soft-start Time IC operates with PWM mode during Soft-start time. Timing Chart Notes: Please note that the turn-on speed of VOUT could be affected by the power supply capacity, the output current, the inductance value, the COUT value and the turn-on speed of VIN determined by CIN.

No.EA-296-210909 (2) Under Voltage Lockout (UVLO) Circuit If VIN becomes lower than V SET, the step-down DC/DC converter stops the switching operation and ON duty becomes 100%, and then VOUT gradually drops according to VIN. If the VIN drops more and becomes lower than the UVLO detector threshold (V UVLO1), the UVLO circuit starts to operate, VREF stops, and Pch and Nch built-in switch transistors turn “OFF”. As a result, VOUT drops according to the COUT capacitance value and the load. To restart the operation, VIN needs to be higher than V UVLO2. The timing chart below shows the voltage shifts of VREF, VLX and VOUT when VIN value is varied. Output Voltage (VOUT) Input Voltage (VIN) VUVLO2 IC Internal Reference Voltage (VREF) VUVLO1 Lx Voltage (VLX) VSET Depending on Power Supply, Load Current, External Components Soft-start Time Timing Chart Notes: Falling edge (operating) and rising edge (releasing) waveforms of V OUT could be affected by the initial voltage of COUT and the output current of VOUT.

No.EA-296-210909 (3) Over Current Protection Circuit, Latch Type Protection Circuit Over current protection circuit supervises the inductor peak current (the peak current flowing through Pch Tr.) in each switching cycle, and if the current exceeds the L X current limit (ILXLIM), it turns off Pch Tr. I LXLIM of the RP506K is set to Typ.2800 mA. Latch type protection circuit latches the built-in driver to the OFF state and stops the operation of the step- down DC/DC converter if the over current status continues or V OUT continues being the half of the setting voltage for equal or longer than protection delay time (tprot). To release the latch type protection circuit, restart the IC by inputting "L" signal to the CE pin, or restart the IC with power-on or make the supply voltage lower than VUVLO1. Notes: I LXLIM and tprot could be easily affected by self -heating or ambient environment. If the V IN drops dramatically or becomes unstable due to short-circuit, protection operation and tprot could be affected. Protection Delay Time (tprot) Lx Limit Current (ILXLIM) IL flowing through L Current flowing through Pch Tr. Lx Voltage (VLX) Protection Delay Time

No.EA-296-210909 The timing chart below shows the voltage shift of V CE, VLX and VOUT when the IC status is changed by the following orders: VIN rising → stable operation → high load → CE reset → stable operation → VIN falling → VIN recovering (UVLO reset) → stable operation. (1)(2) If the large current flows through the circuit or the IC goes into low V OUT condition due to short-circuit or other reasons, the latch type protection circuit latches the built -in driver to “OFF” state after tprot. Then, VLX becomes "L" and VOUT turns “OFF”. (3) The latch type protection circuit is released by CE reset, which puts the IC into "L" once with the CE pin and back into "H". (4) The latch type protection circuit is released by UVLO reset, which makes VIN lower than VUVLO1. Input Voltage (VIN) VSET UVLO Detector Threshold (VUVLO1) CE Pin Input Voltage (VCE) VSET Threshold Level Lx Voltage (VLX) VSET Output Voltage (VOUT) UVLO Released Voltage (VUVLO2) (1) (2) Soft-start Time VSET Soft-start Time Soft-start Time Stable Operation Stable Operation Stable Operation Protection Delay Time Protection Delay Time UVLO Reset CE Reset Latch-type Protection Latch-type Protection (3) (4) Timing Chart

No.EA-296-210909

APPLICATION INFORMATION

PG function is used, 30 ms Soft-start Time *1 MODE = “H”: forced PWM control, MODE = “L”: PWM/VFM auto switching control PVIN PG PGND LX VOUT AGND VIN COUT 30 uF VOUT 2.2 uH RP506K CE TSS MODE*1 RPG 100 kΩ CIN 10 uF PG AVIN CSS 0.1 uF RP506Kxx1A/B/D/E (Fixed Output Voltage Type) PG function is not used, 150 µs Soft-start Time *1 MODE = “H”: forced PWM control, MODE = “L”: PWM/VFM auto switching control PVIN PG PGND Lx VFB AGND VIN COUT 30 uF VOUT 2.2 uH RP506K AVIN CE TSS MODE*1 CIN 10 uF RP506K001C/F (Adjustable Output Voltage Type)

Table 1. Recommended External Components

No.EA-296-210909 TECHNICAL NOTES The performance of power source circuits using this IC largely depends on peripheral circuits. When selecting the peripheral components, please consider the conditions of use. Do not allow each component, PCB pattern or the IC to exceed their respected rated values (voltage, current, and power) when designing the peripheral circuits.  AGND and PGND must be wired to the GND plane when mounting on boards.  AVIN and PVIN must be wired to the VIN plane when mounting on boards.  Ensure the A/PVIN and A/PGND lines are s ufficiently robust. A large switching current flow s through the A/ PGND line, the VDD line, the VOUT line, an inductor, and LX. If their impedance is too high, noise pickup or unstable operation may result. Set the external components as close as possible to the IC and minimize the wiring between the components and the IC. Especially, place a capacitor (C IN) as close as possible to the PVIN pin and PGND. For the RP506Kxx1A/B/D/E, separate the wiring between the VOUT pin and an inductor (L1) from the wiring between L1 and Load. Likewise, for the RP506K001C/F, separate the wiring between a resistor for setting output voltage (R1) and an inductor (L2) f rom the wiring between L2 and Load.  Choose a low ESR ceramic capacitor . The ceramic capacitance of C IN should be more than or equal to 10 µF. For a ceramic capacitor (COUT), it is recommended that three paralleled 10 µF ceramic capacitors or two paralleled 22 µF ceramic capacitors be used.  When VSET ≤ 3.3 V, a 2.2 μH inductor is recommended for RP506Kxx1A/B/C/D/E/F. When VSET ≤ 2.3 V, a 1.5 μH inductor can be used for RP506Kxx1A/B/C. When VSET ≤ 1.5 V, a 1 μH inductor can be used for RP506Kxx1A/B/C. When VSET > 3.3 V, a 4.7 μH inductor is recommended for RP506K001C/F. The phase compensation of this IC is designed according to the C OUT and L values. Choose an inductor that has small DC resistance, has enough allowable current and is hard to cause magnetic saturation. If the inductance value of an inductor is extremely small, the peak current of L X may increase along with the load current. As a result, over current protection circuit may start to operate when the peak current of L X reaches to “LX limit current”. Set Output Voltage Range vs. Inductance Range Version RP506Kxx1A/B RP506Kxx1D/E VSET (V) L = 1.0 μH L = 1.5 μH L = 2.2 μH L = 2.2 μH up to 1.5 Acceptable Acceptable Recommended Recommended 1.6 to 2.3 - Acceptable Recommended Recommended 2.4 to 3.3 - - Recommended Recommended Version RP506K001C RP506K001F up to 1.5 Acceptable Acceptable Recommended - Recommended - 1.6 to 2.3 - Acceptable Recommended - Recommended - 2.4 to 3.3 - - Recommended - Recommended - 3.4 or more - - - Recommended - Recommended

No.EA-296-210909  Over current protection circuit and latch type protection circuit may be affected by self-heating or power dissipation environment.  The output voltage (VSET) is adjustable by changing the resistance values of resistors (R1, R2) as follows. VSET = VFB × (R1 + R2) / R2 (Recommended VOUT range for RP506K001F: 0.6 V ≤ VSET ≤ 4.0 V) (Recommended VOUT range for RP506K001C: 0.8 V ≤ VSET ≤ 4.0 V) If R1 and R2 are too large, the impedances of V FB also become large, as a result, the IC could be easily affected by noise. For this reason, R2 should be 220 k Ω or less. If the operation becomes unstable due to the high impedances, the impedances should be decreased. C1 can be calculated by the following equations. Please use the value close to the calculation result. If the output voltage is lower than or equal to 3.3 V: C1 = 4.84 × 10 -6 / R2 [F] If the output voltage exceeds 3.3 V: C1 = 1.50 × 10 -6 / R2 [F] The recommended resistance values for R1 and C1 when R2 = 220 kΩ or 100 kΩ are as follows. Set Output Voltage (VSET) vs. Resistors (R1, R2) and Capacitor (C1) R1 [kΩ] 0 36.7 73.3 220 440 697 990 533 567 R2 [kΩ] 220 220 220 220 220 220 220 100 100 C1 [pF] - 22 22 22 22 22 22 15 15  Soft-start Time (tstart) is adjustable by connecting a capacitor (CSS) between the TSS pin and GND. The capacitance value for CSS that is suitable for tstart can be calculated by the following equation. C SS (nF) = 3.5 × tstart (ms) The TSS pin must be open if Soft -start time function is not used. Soft -start time is set to typically 150 µ s when the TSS pin is open.  When using the power good function, the resistance value of a resistor (R PG) should be between 10 kΩ to 100 kΩ. The PG pin must be open or connected to GND if the power good function is not used.

No.EA-296-210909 Reference PCB Layouts RP506xxxA/B/D/E (PKG: DFN(PL)2527−10pin) PCB Layout Topside Backside RP506K001C/F (PKG: DFN(PL)2527−10pin) PCB Layout Topside Backside ∗ R11 and R12 are arranged as a substitute for R1 so that two resistors can be connected in series.

No.EA-296-210909 TYPICAL PERFORMANCE CHARACTERISTICS Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed. 1) Output Voltage vs. Output Current RP506Kxx1A/B/C VOUT = 1.2 V RP506Kxx1A/B/C VOUT = 1.2 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1A/B/C VOUT = 1.8 V RP506Kxx1A/B/C VOUT = 1.8 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1A/B/C VOUT = 3.3 V RP506Kxx1A/B/C VOUT = 3.3 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=5.0V 1.780 1.785 1.790 1.795 1.800 1.805 1.810 1.815 1.820 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=5.0V 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=4.3V Vin=5.0V 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=4.3V Vin=5.0V

No.EA-296-210909 RP506Kxx1D/E/F VOUT = 0.6 V RP506Kxx1D/E/F VOUT = 0.6 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 0.8 V RP506Kxx1D/E/F VOUT = 0.8 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 1.2 V RP506Kxx1D/E/F VOUT = 1.2 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control 0.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=4.5V 0.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=4.5V 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=5.0V 1.180 1.185 1.190 1.195 1.200 1.205 1.210 1.215 1.220 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=5.0V

No.EA-296-210909 RP506Kxx1D/E/F VOUT = 1.8 V RP506Kxx1D/E/F VOUT = 1.8 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 3.3 V RP506Kxx1D/E/F VOUT = 3.3 V MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control 2) Output Voltage vs. Input Voltage RP506Kxx1D/E/F VOUT = 0.6 V RP506Kxx1D/E/F VOUT = 0.8 V MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control 1.780 1.785 1.790 1.795 1.800 1.805 1.810 815 1.820 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=5.0V 1.780 1.785 1.790 1.795 1.800 1.805 1.810 815 1.820 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=5.0V 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=4.3V Vin=5.0V 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 3.350 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=4.3V Vin=5.0V 0.780 0.785 0.790 0.795 0.800 0.805 0.810 0.815 0.820 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=1000mA Iout=2000mA 0.580 0.585 0.590 0.595 0.600 0.605 0.610 0.615 0.620 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=1000mA Iout=2000mA

No.EA-296-210909 RP506K VOUT = 1.2 V RP506K VOUT = 1.8 V MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506K VOUT = 3.3 V MODE = “H” Forced PWM Control 3) Output Voltage vs. Ambient Temp. 4) Feedback Voltage vs. Ambient Temp. RP506K181A/B/D/E VOUT = 1.8 V RP506K001C/F 1.180 1.185 1.190 1.195 1.200 1.205 1.210 215 1.220 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=1000mA Iout=2000mA 1.780 1.785 1.790 1.795 1.800 1.805 1.810 815 1.820 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=1000mA Iout=2000mA 3.260 3.270 3.280 3.290 3.300 3.310 320 3.330 3.340 3.350 3.8 4.3 4.8 5.3 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=1000mA Iout=2000mA 1.770 1.780 1.790 1.800 1.810 1.820 1.830 -50 -25 0 25 50 75 100 Temperature Ta (℃) Output Voltage V OUT (V) Vin=3.6V 0.591 0.593 0.595 0.597 0.599 0.601 0.603 0.605 0.607 0.609 -50 -25 0 25 50 75 100 Temperature Ta (℃) Feedback Voltage V FB (V) Vin=3.6V

No.EA-296-210909 5) Efficiency vs. Output Current RP506Kxx1A/B/C VOUT = 1.2 V RP506Kxx1A/B/C VOUT = 1.8 V RP506Kxx1A/B/C VOUT = 3.3 V RP506Kxx1D/E/F VOUT = 0.6 V RP506Kxx1D/E/F VOUT = 0.8 V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=3.6V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=3.6V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=3.6V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=3.6V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=4.3V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=4.3V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=3.6V, VMODE=0V VIN=VMODE=3.6V VIN=VMODE=5.0V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=4.5V, VMODE=0V VIN=3.6V, VMODE=0V VIN=VMODE=4.5V VIN=VMODE=3.6V

No.EA-296-210909 RP506Kxx1D/E/F VOUT = 1.2 V RP506Kxx1D/E/F VOUT = 1.8 V RP506Kxx1D/E/F VOUT = 3.3 V 6) Supply Current vs. Ambient Temp. 7) Supply Current vs. Input Voltage RP506K VOUT = 1.8 V(VIN = 5.5 V) RP506K VOUT = 1.8 V MODE = “L”PWM/VFM Auto Switching Control MODE = “L” PWM/VFM Auto Switching Control 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=3.6V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=3.6V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=3.6V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=3.6V 100 0.01 0.1 1 10 100 1000 10000 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=4.3V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=4.3V -50 0 50 100 Temperature Ta (°C) Supply Current (uA) Closed Loop Open Loop 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN (V) Supply Current (uA) Closed Loop Open Loop

No.EA-296-210909 8) Output Voltage Waveform RP506Kxx1A/B/C VOUT = 0.8 V(VIN = 3.6 V) MODE = “L”PWM/VFM Auto Switching Control RP506Kxx1A/B/C VOUT = 1.2 V(VIN = 3.6 V) RP506Kxx1A/B/C VOUT = 1.2 V(VIN = 3.6 V) MODE = “L” PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1A/B/C VOUT = 1.8 V(VIN = 3.6 V) RP506Kxx1A/B/C VOUT = 1.8 V(VIN = 3.6 V) MODE = “L” PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control -0.03 -0.02 -0.01 0.00 0.01 0.02 -50 -40 -30 -20 -10 0 10 20 30 40 50 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 500 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -50 -40 -30 -20 -10 0 10 20 30 40 50 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 500 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -50 -40 -30 -20 -10 0 10 20 30 40 50 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 500 Inductor Current IL (mA) Output Voltage IL IOUT=10mA

No.EA-296-210909 RP506Kxx1A/B/C VOUT = 3.3 V(VIN = 5.0 V) RP506Kxx1A/B/C VOUT = 1.8 V(VIN = 5.0 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 0.6 V(VIN = 3.6 V) RP506Kxx1D/E/F VOUT = 0.6 V(VIN = 3.6 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 0.8 V(VIN = 3.6 V) RP506Kxx1D/E/F VOUT = 0.8 V(VIN = 3.6 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -50 -40 -30 -20 -10 0 10 20 30 40 50 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 500 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.06 -0.04 -0.02 0.00 0.02 -250 -150 -50 50 150 250 Time t (μs) Output Ripple Voltage(AC) Vripple (V) 200 400 600 800 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.06 -0.04 -0.02 0.00 0.02 -250 -200 -150 -100 -50 0 50 100 150 200 250 Time t (μs) Output Ripple Voltage(AC) Vripple (V) 200 400 600 800 Inductor Current IL (mA) Output Voltage IL IOUT=10mA

No.EA-296-210909 RP506Kxx1D/E/F VOUT = 1.2 V(VIN = 3.6 V) RP506Kxx1D/E/F VOUT = 1.2 V(VIN = 3.6 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 1.8 V(VIN = 3.6 V) RP506Kxx1D/E/F VOUT = 1.8 V(VIN = 3.6 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F VOUT = 3.3 V(VIN = 5.0 V) RP506Kxx1D/E/F VOUT = 3.3 V(VIN = 5.0 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “H” Forced PWM Control -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.06 -0.04 -0.02 0.00 0.02 -250 -200 -150 -100 -50 0 50 100 150 200 250 Time t (μs) Output Ripple Voltage(AC) Vripple (V) 200 400 600 800 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.06 -0.04 -0.02 0.00 0.02 -250 -200 -150 -100 -50 0 50 100 150 200 250 Time t (μs) Output Ripple Voltage(AC) Vripple (V) 200 400 600 800 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -5 -4 -3 -2 -1 0 1 2 3 4 5 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA -0.03 -0.02 -0.01 0.00 0.01 0.02 -250 -200 -150 -100 -50 0 50 100 150 200 250 Time t (μs) Output Ripple Voltage(AC) Vripple (V) 200 400 600 800 Inductor Current IL (mA) Output Voltage IL IOUT=10mA

No.EA-296-210909 9) Oscillator Frequency vs. Ambient Temp. RP506Kxx1A/B/C RP506Kxx1D/E/F 10) Oscillator Frequency vs. Input Voltage RP506Kxx1A/B/C RP506Kxx1D/E/F 11) Soft-start Time vs. Ambient Temp. 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 -50 -25 0 25 50 75 100 Temperature Ta (°C) Frequency fosc (MHz) Vin=3.6 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 -50 -25 0 25 50 75 100 Temperature Ta (°C) Frequency fosc (MHz) Vin=3.6 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN (V) Frequency fosc (MHz) -40°C 25°C 85°C 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN (V) Frequency fosc (MHz) -40°C 25°C 85°C 150 160 170 180 190 200 210 220 230 240 250 -50 -25 0 25 50 75 100 Temperature Ta (℃) Soft Start Time tstart1 (us)

No.EA-296-210909 12) UVLO Detector Threshold/ Released Voltage vs. Ambient Temp. UVLO Detector Threshold UVLO Released Voltage 13) CE Input Voltage vs. Ambient Temp. CE“H” Input Voltage (VIN = 5.5 V) CE “L” Input Voltage (VIN = 2.5 V) 14) Lx Limit Current vs. Ambient Temp. 2.15 2.16 2.17 2.18 2.19 2.20 2.22 2.23 2.24 2.25 -50 -25 0 25 50 75 100 Temperature ( ℃) UVLO Voltage V UVLO1 (V) 2.25 2.26 2.27 2.28 2.29 2.30 2.32 2.33 2.34 2.35 -50 -25 0 25 50 75 100 Temperature ( ℃) UVLO Voltage V UVLO2 (V) 0.3 0.4 0.5 0.6 0.7 0.8 1.0 1.1 -50 -25 0 25 50 75 100 Temperature ( ℃) CE Input Voltage V CEH (V) 0.3 0.4 0.5 0.6 0.7 0.8 1.0 1.1 -50 -25 0 25 50 75 100 Temperature ( ℃) CE Input Voltage V CEL (V) 2700 2800 2900 3000 3100 3200 3300 -50 -25 0 25 50 75 100 Temperature ( ℃) LX Limit Current I LXLIM (mA)

No.EA-296-210909 17) PG Detector Threshold vs. Ambient Temp. Over Voltage Detection (VOVD) Under Voltage Detection (VUVD) 18) Soft-start Waveform RP506K VOUT = 1.8 V TSS = Open RP506K VOUT = 1.8 V TSS = 0.1 µF 0.02 0.04 0.06 0.08 0.10 0.14 0.16 0.18 0.20 -50 -25 0 25 50 75 100 Temperature ( ℃) Nch Tr. ON Resistance R ON (Ω) 0.02 0.04 0.06 0.08 0.10 0.14 0.16 0.18 0.20 -50 -25 0 25 50 75 100 Temperature ( ℃) Pch Tr. ON Resistance R ON (Ω) 1.10 1.15 1.20 1.25 1.30 -50 -25 0 25 50 75 100 Temperature ( ℃) PG Over Voltage Detection VOVD Voltage (VSET×Y) 0.70 0.75 0.80 0.85 0.90 -50 -25 0 25 50 75 100 Temperature ( ℃) PG Under Voltage Detection VUVD Voltage (VSET×Y) VSET× VSET× VSET× VSET× -50 0 50 100 150 200 250 300 350 400 450 Time t (us) CE Input Voltage (V) Output Voltage (V) PG Voltage (V) -5 0 5 10 15 20 25 30 35 40 45 Time t (ms) CE Input Voltage (V) Output Voltage (V) PG Voltage (V) CE Input Voltage CE Input Voltage PG Voltage PG Voltage Output Voltage Output Voltage

No.EA-296-210909 19) Load Transient Response RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 0.8 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 0.8 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 0.8 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 0.8 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.2 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.2 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L” PWM/VFM Auto Switching Control 0.70 0.75 0.80 0.85 0.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 0.70 0.75 0.80 0.85 0.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage 0.70 0.75 0.80 0.85 0.90 0.95 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 0.70 0.75 0.80 0.85 0.90 0.95 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage Output Voltage

No.EA-296-210909 RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.2 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.2 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.2 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.2 V) RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.8 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.8 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 1.60 1.70 1.80 1.90 2.00 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.60 1.70 1.80 1.90 2.00 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage Output Voltage

No.EA-296-210909 RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.8 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.8 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.8 V) RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.8 V) RP506Kxx1A/B/C (VIN = 5.0 V, VOUT = 3.3 V) RP506Kxx1A/B/C (V IN = 5.0 V, VOUT = 3.3 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 3.10 3.20 3.30 3.40 3.50 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 3.10 3.20 3.30 3.40 3.50 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage Output Voltage

No.EA-296-210909 RP506Kxx1A/B/C (VIN = 5.0 V, VOUT = 3.3 V) RP506Kxx1A/B/C (V IN = 5.0 V, VOUT = 3.3 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1A/B/C (VIN = 5.0 V, VOUT = 3.3 V) RP506Kxx1A/B/C (V IN = 5.0 V, VOUT = 3.3 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.6 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.6 V) MODE = “L”PWM/VFM Auto Switching Control MOD E = “L”PWM/VFM Auto Switching Control 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 0.50 0.55 0.60 0.65 0.70 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 0.50 0.55 0.60 0.65 0.70 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage

No.EA-296-210909 RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.6 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 0.6 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.6 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 0.6 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.8 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 0.8 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control 0.50 0.55 0.60 0.65 0.70 0.75 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 0.50 0.55 0.60 0.65 0.70 0.75 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 0.50 0.55 0.60 0.65 0.70 0.75 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) 0.50 0.55 0.60 0.65 0.70 0.75 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 1000mA-->2000mA Output Current 2000mA-->1000mA 0.70 0.75 0.80 0.85 0.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 0.70 0.75 0.80 0.85 0.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage

No.EA-296-210909 RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.8 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.8 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 0.8 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 0.8 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.2 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 1.2 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control 0.70 0.75 0.80 0.85 0.90 0.95 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 0.70 0.75 0.80 0.85 0.90 0.95 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 0.70 0.75 0.80 0.85 0.90 0.95 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 0.70 0.75 0.80 0.85 0.90 0.95 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage Output Voltage

No.EA-296-210909 RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.2 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.2 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.2 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 1.2 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.8 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 1.8 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 1.00 1.10 1.20 1.30 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 1.60 1.70 1.80 1.90 2.00 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.60 1.70 1.80 1.90 2.00 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage Output Voltage

No.EA-296-210909 RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.8 V) RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.8 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.8 V) RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 1.8 V) RP506Kxx1D/E/F (VIN = 5.0 V, VOUT = 3.3 V) RP506Kxx1D/E/F (V IN = 5.0 V, VOUT = 3.3 V) MODE = “L”PWM/VFM Auto Switching Control MODE = “L”PWM/VFM Auto Switching Control 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 1.60 1.70 1.80 1.90 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 3.10 3.20 3.30 3.40 3.50 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 3.10 3.20 3.30 3.40 3.50 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Current 200mA-->1000mA Output Current 1000mA-->200mA Output Voltage Output Voltage

No.EA-296-210909 RP506Kxx1D/E/F (VIN = 5.0 V, VOUT = 3.3 V) RP506Kxx1D/E/F (V IN = 5.0 V, VOUT = 3.3 V) MODE = “H” Forced PWM Control MODE = “H” Forced PWM Control RP506Kxx1D/E/F (VIN = 5.0 V, VOUT = 3.3 V) RP506Kxx1D/E/F (V IN = 5.0 V, VOUT = 3.3 V) 20) Auto Switching Control Waveform RP506Kxx1A/B/C RP506Kxx1A/B/C (V IN = 3.6 V, VOUT = 1.2 V, IOUT = 1 mA) (VIN = 3.6 V, VOUT = 1.2 V, IOUT = 1 mA) MODE = “L” --> MODE = “H” MODE = “H” --> MODE = “L” 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (μs) Output Voltage V OUT (V) 500 1000 1500 Output Current I OUT (mA) Output Voltage Output Voltage Output Current 200mA-->1000mA Output Current 1000mA-->200mA 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 1000mA-->2000mA 3.10 3.20 3.30 3.40 -20 0 20 40 60 80 100 120 140 160 180 Time t (us) Output Voltage V OUT (V) 1000 2000 3000 Output Current I OUT (mA) Output Current 2000mA-->1000mA Output Voltage Output Voltage 1.15 1.20 1.25 1.30 -100 0 100 200 300 400 500 600 700 800 900 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE(V) Output Voltage Mode Input Voltage 1.15 1.20 1.25 1.30 -100 0 100 200 300 400 500 600 700 800 900 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE(V) Output Voltage Mode Input Voltage

No.EA-296-210909 RP506Kxx1A/B/C RP506Kxx1A/B/C (VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1 mA) (VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1 mA) MODE = “L” --> MODE = “H” MODE = “H” --> MODE = “L” RP506Kxx1D/E/F RP506Kxx1D/E/F (V IN = 3.6 V, VOUT = 1.2 V, IOUT = 1 mA) (V IN = 3.6 V, VOUT = 1.2 V, IOUT = 1 mA) MODE = “L” --> MODE = “H” MODE = “H” --> MODE = “L” RP506Kxx1D/E/F RP506Kxx1D/E/F (VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1 mA) (VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1mA) MODE = “L” --> MODE = “H” MODE = “H” --> MODE = “L” 1.75 1.80 1.85 1.90 1.95 2.00 -100 0 100 200 300 400 500 600 700 800 900 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE(V) Output Voltage Mode Input Voltage 1.75 1.80 1.85 1.90 1.95 2.00 -100 0 100 200 300 400 500 600 700 800 900 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE(V) Output Voltage Mode Input Voltage 1.15 1.20 1.25 1.30 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE V) Output Voltage Mode Input Voltage 1.15 1.20 1.25 1.30 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage 1.75 1.80 1.85 1.90 1.95 2.00 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage 1.75 1.80 1.85 1.90 1.95 2.00 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (us) Output Voltage V OUT (V) Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage

POWER DISSIPATION DFN(PL)2527-10 Ver. A i The power dissipation of the package is dependent on PCB material, layout, and environmental conditions. The following conditions are used in this measurement. Measurement Conditions High Wattage Land Pattern Standard Land Pattern Environment Mounting on Board (Wind Velocity = 0 m/s) Mounting on Board (Wind Velocity = 0 m/s) Board Material Glass Cloth Epoxy Plastic (Four-Layer Board) Glass Cloth Epoxy Plastic (Double-Sided Board) Board Dimensions 35 mm × 90 mm × 0.8 mm 40 mm × 40 mm × 1.6 mm Copper Ratio Outer Layers (First and Fourth Layers): Approx.15% Inner Layers (Second and Third Layers): Approx.15% Top Side: Approx. 50% Bottom Side: Approx. 50% Copper Foil Thickness Outer Layers (First and Fourth Layers): Approx. 35 µm Inner Layers (Second and Third Layers): Approx. 18 µm Top Side: Approx. 35 µm Bottom Side: Approx. 35 µm Through-holes φ 0.3 mm × 9 holes (connecting outer and inner layers to a package tab) φ 0.5 mm × 10 holes (connecting pins) φ 0.54 mm × 30 holes Measurement Result (Ta = 25°C, Tjmax = 125°C) Hig h Wattage Land Pattern Standard Land Pattern Power Dissipation 1400 mW (Tjmax = 125°C) 910 mW (Tjmax = 125°C) Thermal Resistance θja = (125 − 25°C) / 1.4 W = 71°C/W θjc = (125 − 25°C) / 0.91 W = 110°C/W High Wattage Standard IC Mount A rea (mm) Power Dissipation vs. Ambient Temperature Measurement Board Pattern Power Dissipation (mW) 2000 1500 1000 500 0 25 50 75 100 125 150 Ambient Temperature (°C) 1400 High Wattage Land Pattern Standard Land Pattern 910

PACKAGE DIMENSIONS DFN(PL)2527-10 Ver. A i DFN(PL)2527-10 Package Dimensions ∗ The tab on the bottom of the package is substrate level (GND). It is recommended that the tab be connected to the ground plane on the board, or otherwise be left floating. 2.50 2.70 A B 0.05 INDEX 0.6max. 0.05min. S 0.05 S 6 10 5 1 0.25±0.1 0.25±0.1 0.10nom. 0.30±0.1 1.5±0.1 0.50 0.20±0.1 0.05 M AB 2.3±0.1 φ 0.5±0.05

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