RP550-EC

RP550-EC NISSHINBO | Alldatasheet

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

for Automotive Applications NO.EC-285-170906 OUTLINE The RP550L001B is a 1 A(1) dual step-down DC/DC converter with synchronous rectifier. Replacing diodes with built -in switching transistors improves the efficiency of rectification. Therefore, by simply using two inductors, resistors and capacitors as the external components, a low ripple high efficiency synchronous rectifier step-down DC/DC converter can be easily configured. Protection functions include a current limit function, a latch- off overcurrent protection function, a thermal shutdown function, and so on. Output Voltage Control Methods have t wo operati ng modes: Forced PWM mode and PWM/VFM Auto- switching mode. By inputting a signal to the MODE pin, the RP550L001B can select from between two modes. When the both converters are in PWM control, the converters operate with 180° turn-on phase shift of the switching transistors. FEATURE S  Input Voltage Range (Maximum Rating)  Output Voltage Temperature Coefficient ········· ±100 ppm/°C (1) This is an approximate value, because output current depends on conditions and external components. (2) VSET: Set Output Voltage (3) Output voltage is settable by external resistor. Recommended range is up to 3.3 V.

NO.EC-285-170906 APPLICATION  Power source for car accessories including car audio equipment, car navigation system, and ETC system SELECTION GUIDE Sel ection Guide Product Name Package Quantity per Reel Pb Free Halogen Free RP550L001B-TR-# DFN3030-12 3,000 pcs Yes Yes Set output voltage (VSET) is adjustable with external divider resistors. The recommended VSET range is from 0.6 V to 3.3 V. #: Specify the Automotive Class Code. Operating Temperature Range Guaranteed Specs Temperature Range Screening AEC-Q100 A −40°C to 105°C 25°C High Temperature Grade 2

NO.EC-285-170906 BLOCK DIAGRAM UVLO PROTECTION THERMAL PROTECTION CHIP ENABLE LX1 VFB1 CE1 PGND1 AGND VIN MODE VFB2 CE2 OSCILLATOR CLK 0° CLK 180° CLK 180° VREF PWM / VFM CONTROL PWM / VFM CONTROL CHIP ENABLE SWITCHING CONTROL SLOPE COMPENSATION CURRENT FEEDBACK CURRENT PROTECTION SOFTSTART VREF SWITCHING CONTROL SLOPE COMPENSATION CURRENT FEEDBACK CURRENT PROTECTION SOFTSTART VIN LX2 PGND2 RP550L001B Block Diagram

NO.EC-285-170906 PIN DESCRIPTIONS DFN3030-12 Pin Configuration Pin Descriptions Pin No. Symbol Description

1 VFB2 Channel 2 Feedback Pin

2 MODE Mode Control Pin

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

3 VIN (1) Input Pin

4 VIN (1) Input Pin

5 AGND (2) Analog Ground Pin

6 VFB1 Channel 1 Feedback Pin

7 CE1 Channel 1 Chip Enable Pin (“H” active)

8 LX1 Channel 1 LX Switching Pin

9 PGND1 (2) Channel 1 Power Ground Pin

10 PGND2 (2) Channel 2 Power Ground Pin

11 LX2 Channel 2 LX Switching Pin

12 CE2 Channel 2 Chip Enable Pin (“H” active)

∗ The exposed t ab on the bottom of the package enhances thermal performance and is electrically connected to GND (substrate level). It is recommended that the exposed tab be connected to the ground plane on the board or otherwise be left open. (1) VIN pin (No.3 and No.4) must be wired to the VIN plane when mounting on boards. (2) GND pin (No.5, No.9, and No.10) must be wired to the GND plane when mounting on boards. Bottom View Top View

NO.EC-285-170906 ABSOLUTE MAXIMUM RATINGS Symbol Item Rating Unit VIN V IN Pin Voltage -0.3 to 6.5 V VLX1, VLX2 L X1 / LX2 Pin Voltage -0.3 to VIN + 0.3 V VCE1, VCE2 CE1 / CE2 Pin Voltage -0.3 to 6.5 V VMODE MODE Pin Voltage -0.3 to 6.5 V VFB1, VFB2 VFB1 / VFB2 Pin Voltage -0.3 to 6.5 V ILX1, ILX2 LX1 / LX2 Pin Output Current 1.9 A PD Power Dissipation(1) (DFN3030-12) Standard Test Land Pattern 1250 mW JEDEC STD. 51-7 Test Land Pattern 2440 mW Tj Junction Temperature Range -40 to 150 °C Tstg Storage Temperature Range -55 to 150 °C ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages 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 (0.6 V ≤ VSET (2) < 0.8 V) 2.3 to 4.5 V Input Voltage (0.8 ≤ VSET (2)) 2.3 to 5.5 V Ta Operating Temperature Range −40 to 105 °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 when they are used over 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 POWER DISSIPATION for detailed information. (2) VSET: Set Output Voltage

NO.EC-285-170906

ELECTRICAL CHARACTERISTICS

Test Circuit is “OPEN LOOP” and Test Condition is AGND=PGND1=PGND2=0V, unless otherwise noted. The specifications surrounded by are guaranteed by design engineering at –40°C ≤ Ta ≤ 105°C. RP550L001B (-A) Electrical Characteristics (Ta = 25°C) Symbol Item Conditions Min. Typ. Max. Unit VFB Feedback Voltage VIN=VCE1=VCE2 = 3.6V Ta = 25°C 0.591 0.600 0.609 V –40°C≤Ta≤105°C 0.588 0.612 fOSC Oscillator Frequency VIN = VCE1 = VCE2 = 3.6V 2.05 2.30 2.55 MHz IDD1 Supply Current 1 (1) VIN = VCE1 = VCE2 = 5.5V, VFB1=VFB2 = 0.45V, VMODE = 0V 800 1100 µA IDD2 Supply Current 2 (1) VIN = VCE1 = VCE2 = 5.5V, VFB1=VFB2 = 0.75V, VMODE = 0V 45 60 µA IDD3 Supply Current 3 (1) VIN = VCE1 = VCE2 = 5.5V, VFB1=VFB2 = 0.75V, VMODE = 5.5V 800 1100 µA Istandby Standby Current (2) VIN = 5.5V, VCE1 = VCE2 = 0V 0 10 µA ICEH CE “High” Input Current (1) VIN = 5.5V, VCE1 = VCE2 = 5.5V -1 0 1 µA ICEL CE “Low” Input Current (1) VIN = 5.5V, VCE1 = VCE2 = 0V -1 0 1 µA IMODEH MODE “H” Input Current VIN = VMODE = 5.5V -1 0 1 µA IMODEL MODE “L” Input Current VIN = 5.5V, VMODE = 0V -1 0 1 µA IFBH VFB “High” Input Current (1) VIN=VFB1=VFB2=5.5V, VCE1=VCE2=0V -1 0 1 µA IFBL VFB “Low” Input Current (1) VIN=5.5V, VCE1=VCE2=VFB1=VFB2=0V -1 0 1 µA ILXLEAKH L X Leakage Current “High” (1) VIN = VLX1 = VLX2 = 5.5V, VCE1 = VCE2 =0V -1 0 5 µA ILXLEAKL LX Leakage Current “Low” (1) VIN=5.5V, VCE1=VCE2=VLX1=VLX2=0V -6 0 1 µA VCEH CE “H” Input Voltage VIN = 5.5V 1.0 V VCEL CE “L” Input Voltage VIN = 2.3V 0.4 V VMODEH MODE “High” Input Voltage VIN = 5.5V 1.0 V VMODEL MODE “Low” Input Voltage VIN = 2.3V 0.4 V RONP Pch.Transistor ON Resistance VIN = 3.6V, ILX1 = ILX2 = -100mA 0.25 Ω RONN Nch.Transistor ON Resistance VIN = 3.6V, ILX1 = ILX2 = -100mA 0.21 Ω Tstart Soft-start Time VIN = VCE1 = VCE2 = 3.6V 200 300 µs ILXLIM LX Limit Current VIN = VCE1 = VCE2 = 3.6V 1400 1900 mA tPROT Protection Delay Time VIN = VCE1 = VCE2 = 3.6V 0.5 1.5 5 ms VUVLO1 UVLO Threshold Voltage VIN = VCE1 = VCE2, Falling 1.9 2.0 2.1 V VUVLO2 VIN = VCE1 = VCE2, Rising 2.0 2.1 2.2 V TTSD Thermal Shutdown Threshold Temperature Tj, Rising 165 °C TTSR Tj, Falling 125 °C (1) Either Channel 1 value or Channel 2 value is indicated. (2) The sum of Channel 1 and Channel 2 is indicated.

NO.EC-285-170906 THEORY OF OPERATION Soft-start Starting-up with CE Pin RP550L starts to operate when the CE pin voltage (VCE) exceeds the threshold voltage. The threshold voltage is preset between CE “High” input voltage (VCEH) and CE “Low” input voltage (VCEL). The soft-start circuit also starts to operate after the device start-up. Then, after a certain period of time, the reference voltage (VREF) in the device gradually increases up to the specified value. Notes: Soft start time (tSTART)(1) might not be always equal to an actual 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 COUT value. VCEH Soft-start Time (tSTART) 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 Timing Chart when Starting-up with CE Pin Starting-up with Power Supply After the power-on, the device starts to operate when V IN exceeds the UVLO released voltage (V UVLO2). The soft-start circuit also starts to operate. Then after a certain period of time, VREF gradually increases up to the specified value. Notes: Please note that the turn-on speed of VOUT could be affected by the following conditions. 1. Power supply capacity and Turn-on speed of VIN determined by CIN 2. Output current and Output capacity of COUT (1) Soft-start time (tSTART) indicates the duration until the reference voltage (VREF) reaches the specified voltage after soft- start circuit’s activation.

NO.EC-285-170906 Output Voltage (VOUT) Input Voltage (VIN) VUVLO2 Internal Reference Voltage (VREF) LX Voltage (VLX) VSET Depending on Power Supply, Load Current, External Components Soft-start Time (tSTART) Timing Chart when Starting-up with Power Supply Under Voltage Lockout (UVLO) If VIN becomes lower than V SET, the step-down DC/DC converter st ops the switching operation and ON d uty 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 transistors become the OFF state. As a result, V OUT drops according to the COUT capacitance value and the load. To restart the operation, V IN is required to be higher than V UVLO2. The timing chart below shows the voltage shifts of VREF, VLX and VOUT in response to variation of the VIN value. Notes: Falling edge (operating) and rising edge (releasing) waveforms of V OUT might be affected by the initial voltage of COUT and the output current of VOUT. Output Voltage (VOUT) Input Voltage (VIN) VUVLO2 Internal Reference Voltage (VREF) VUVLO1 LX Voltage (VLX) VSET VSET Depending on Power Supply, Load Current, External Components Soft-start Time (tSTART)

NO.EC-285-170906 Timing Chart with Variations in Input Voltage (VIN) Current limit Function Current limit circuit supervises the inductor peak current (the current flowing through Pch. transistor) in each switching cycle, and if the current exceeds the LX current limit (ILXLIM), Pch. transistor is turned off. ILXLIM of the RP550L001B is Typ.1.9 A. Latch Type Protection Latch type protection circuit latches the built-in driver in the OFF state and stops the operation of the step- down DC/DC converter, if the over current status or V OUT being dropped to the half of the setting voltage due to shorting continues for the protection delay time (tPROT). To release the latch type protection circuit, restart the device by inputting "L" signal to the CE pin or making the supply voltage lower than VUVLO1. Notes: I LXLIM and t PROT could be e asily 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.EC-285-170906 The timing chart below shows the voltage shift of VCE, VLX and VOUT when the device 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 device goes into low VOUT 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 device 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.EC-285-170906 Operation of Step-down DC/DC Converter and Output Current The step-down DC/DC converter charges energy in the inductor when LX transistor turns “ON”, and discharges the energy from the inductor when LX transistor 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. transistor 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. transistor. Step2. When Pch. transistor turns “OFF”, L tries to maintain IL at ILMAX, so L turns Nch. transistor “ON” and IL (i2) flows into L. Step3. i2 decreases gradually and reaches ILMIN after the open-time period (t OPEN) of NMOS transistor, and then Nch. transistor turns “OFF”. This is called discontinuous current mode. As the output current (I OUT) increases, the off -time period (t OFF) of Pch. transistor runs out before I L reaches ILMIN. The next cycle starts, and Pch. transistor turns “ON” and Nch. transistor turns “OFF”, which means IL starts increasing from ILMIN. This is called continuous current mode. In PWM mode, V OUT is maintained by controlling tON. The oscillator frequency (fOSC) is maintained constant during PWM mode. When the step-down DC/DC operation is constant, ILMIN and ILMAX during tON of Pch. transistor would be same as during t OFF of Pch. transistor. The current differential between ILMAX and ILMIN is described as ∆I, as the following equation 1. The above equation is predicated on the following requirements. T = 1 / fOSC = tON + tOFF duty (%) = tON / T × 100 = tON × fOSC × 100 tOPEN ≤ tOFF In Equation 1, “VOUT × 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.EC-285-170906 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. When tON < tONC, it is discontinuous mode, and when tON = tONC, it is continuous mode. Forced PWM Mode and VFM Mode Operating mode to control the output voltage is selectable between a forced PWM mode and a PWM/VFM auto-switching mode, and can be set by the MODE pin. The forced PWM control switches at fixed frequency rate in order to reduce noise in low output current. The PWM/VFM auto- switching control automatically switches from PWM mode to VFM mode in order to achieve high efficiency in low output current. Forced PWM Mode By setting the MODE pin to “H”, the device switches the frequency at the fixed rate to reduce noise even when the output load is light. Therefore, when I OUT is ∆IL/2 or less, I LMIN becomes less than “0” . That is, the accumulated charge in COUT is discharged through the internal transistor while IL is increasing from ILMIN to “0”

NO.EC-285-170906 during tON, and also while IL is decreasing from “0” to ILMIN during tOFF. VFM Mode By setting the MODE pin to “L”, in low output current, the device 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 280 mA for the RP550L001B. 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 T=1/fOSC IL IOUT t ΔIL ILMAX ILMIN tON tOFF IL t Forced PWM Mode VFM Mode

NO.EC-285-170906

APPLICATION INFORMATION

Typical Application Circuit Notes: MODE = “H” forced PWM mode, MODE = “L”PWM/VFM auto switching mode VFB1 PGND1 VIN L1 2.2 µH AGND CIN 10 µF RP550L001B R11 R12 C11 R21 R22 LX1 VFB2 LX2 PGND2 VIN CE1 MODE VIN CE2 2.2 µH C21 10 µF COUT1 10 µF C OUT2 VOUT2 VOUT1 200 kΩ 22 pF 22 pF 100 kΩ 317 kΩ 100 kΩ 2.3 V - 5.5 V = 1.8 V = 2.5 V RP550L001B Typical Application Circuit Recommended External Components Table 1. Recommended External Components: 0.8V ≤ VSET ≤ 3.3V Table 2. Recommended External Components: 0.6V ≤ V

NO.EC-285-170906 Cautions in selecting external parts  Choose a low ESR ceramic capacitor. The ceramic capacitance of a capacitor (C IN) connected between VIN and GND should be more than or equal to 10µ F. The ceramic capacitance of a capacitor (C OUT) connected between V OUT and GND should be 10µ F to 20µ F. Please be aware of the characteristics of bias dependence and temperature fluctuation of ceramic capacitor.  Choose an inductor that has small DC resistance, has enough permissible current and is hard to cause magnetic saturation. If the inductance value of the inductor becomes extremely small under the load conditions, the peak current of LX may increase along with the load current. As a result, over current protection circuit may start to operate when the peak current of LX reaches to LX limit current. Therefore, choose an inductor with consideration for the value of ILXMAX.  The output voltage (V OUT1, VOUT2) is adjustable by changing the resistance values of resistors (R11 and R12, R21 and R22) as follows. VOUT1 = 0.6 × (R11 + R12) / R12 ( Recommended rage: 0.6 V ≤ VOUT1 ≤ 3.3 V) VOUT2 = 0.6 × (R21 + R22) / R22 ( Recommended rage: 0.6 V ≤ VOUT2 ≤ 3.3 V) If R11, R12, R21, and R22 are too large, the impedances of VFB1 and VFB2 also become large, as a result, the device could be easily affected by noise. For this reason, R12 and R22 should be 100kΩ or less. If the operation becomes unstable dues to the high impedances, the impedances should be decreased. C11 and C21 can be calculated by the following equations. Please use the value close to the calculation result. The recommended resistance values for R11, R12, R21, R22, C11, and C21 are as follows. Recommended Resistor and Capacitor Values Output Voltage VOUT1, VOUT2 [V] Resistor [kΩ] Capacitor [pF] R11, R21 R12, R22 C11, C21 0.6 0 100 - 0.7 16.7 100 22 0.8 33.3 100 22 1.2 100 100 22 1.8 200 100 22 2.5 317 100 22 3.3 450 100 22

NO.EC-285-170906 Calculation Conditions of LX Pin Maximum Output Current (ILXMAX) The following equations explain the relationship to determine I LXMAX at the ideal operation of the device in continuous mode. IRP：Ripple Current P-P value RONP / RONN：ON resistance of Pch. / Nch. transistor RL：DC resistor of the inductor First, when the Pch. transistor is “ON”, Equation 1 is satisfied. V Second, when the Pch. transistor is "OFF" (the Nch. transistor is "ON"), Equation 2 is satisfied. L × I Put Equation 2 into Equation 1 to solve ON duty of the Pch. transistor (D ON = tON / (tOFF + tON)): Ripple Current is described as follows: I Peak current that flows through L, and LX transistor is described as follows:

NO.EC-285-170906 TECHNICAL NOTES The performance of a power source circuit using this device is highly dependent on a peripheral circuit. A peripheral component or the device mounted on PCB should not exceed a rated voltage, a rated current or a rated power. When designing a peripheral circuit, please be fully aware of the following points.  AGND, PGND1 and PGND2 must be wired to the GND plane when mounting on boards.  The VIN pins must be wired to the V IN plane when mounting on boards.  Ensure the VIN and GND lines are sufficiently robust. A large switching current flows through the GND line, the VDD line, the V OUT line, an inductor, and LX. If the ir impedance is too high, noise pickup or unstable operation may result. Set external components as close as possible to the device and minimize the wiring between the components and the device , especially between a capacitor and the VIN pin. The wiring between VFB and load and between L and VOUT should be separated.  Over current protection circuit and latch type protection circuit may be affected by self -heating or power dissipation environment. PCB Layout Board RP550L001B (PKG: DFN3030-12 pin) Topside Backside ∗ For supporting the series connection of R11 and R21, R11a and R11b are arranged in series. Likewise, R21a and R22b are arranged in series.

NO.EC-285-170906 TYPICAL CHARACTERISTICS Typical Characteristics are intended to be used as reference data, they are not guaranteed. 1) Output Voltage vs. Output Current RP550L001B VOUT = 0.6 V RP550L001B VOUT = 0.6 V MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control RP550L001B VOUT = 0.8 V RP550L001B VOUT = 0.8 V MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control RP550L001B VOUT = 1.2 V RP550L001B VOUT = 1.2 V MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control 0.58 0.585 0.59 0.595 0.6 0.605 0.61 0.615 0.62 0.01 0.1 1 10 100 1000 Output Current IOUT(m A) Output Voltage V OUT (V) Vin=3.6V Vin=4.5V 0.58 0.585 0.59 0.595 0.6 0.605 0.61 0.615 0.62 0 200 400 600 800 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=4.5V 0.78 0.785 0.79 0.795 0.8 0.805 0.81 0.815 0.82 0.01 0.1 1 10 100 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 0.78 0.785 0.79 0.795 0.8 0.805 0.81 0.815 0.82 0 200 400 600 800 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 1.18 1.185 1.19 1.195 1.2 1.205 1.21 1.215 1.22 0.01 0.1 1 10 100 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 1.18 1.185 1.19 1.195 1.2 1.205 1.21 1.215 1.22 0 200 400 600 800 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V

NO.EC-285-170906 RP550L001B VOUT = 1.8 V RP550L001B VOUT = 1.8 V MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control RP550L001B VOUT = 3.3 V RP550L001B VOUT = 3.3 V MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control 2) Output Voltage vs. Input Voltage RP550L001B VOUT = 0.8 V RP550L001B VOUT = 1.2 V MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 1.78 1.785 1.79 1.795 1.8 1.805 1.81 1.815 1.82 0.01 0.1 1 10 100 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 1.78 1.785 1.79 1.795 1.8 1.805 1.81 1.815 1.82 0 200 400 600 800 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=3.6V Vin=5.0V 3.26 3.27 3.28 3.29 3.3 3.31 3.32 3.33 3.34 3.35 0.01 0.1 1 10 100 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=4.3V Vin=5.0V 3.26 3.27 3.28 3.29 3.3 3.31 3.32 3.33 3.34 3.35 0 200 400 600 800 1000 Output Current IOUT(m A) Output Voltage V OUT(V) Vin=4.3V Vin=5.0V 0.78 0.785 0.79 0.795 0.8 0.805 0.81 0.815 0.82 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=100mA Iout=800mA 1.18 1.185 1.19 1.195 1.2 1.205 1.21 1.215 1.22 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=100mA Iout=800mA

NO.EC-285-170906 RP550L001B VOUT = 1.8 V RP550L001B VOUT = 3.3 V MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 3) Feedback Voltage vs. Ambient Temperature 4) Efficiency vs. Output Current RP550L001B VOUT = 0.6 V RP550L001B VOUT = 0.8 V 1.77 1.78 1.79 1.8 1.81 1.82 1.83 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=100mA Iout=800mA 3.25 3.27 3.29 3.31 3.33 3.35 3.5 4 4.5 5 5.5 Input Voltage VIN(V) Output Voltage V OUT (V) Iout=1mA Iout=100mA Iout=800mA 100 0.01 0.1 1 10 100 1000 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 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.EC-285-170906 RP550L001B VOUT = 1.2 V RP550L001B VOUT = 1.8 V RP550L001B VOUT = 3.3 V 5) Supply Current vs. Ambient Temperature 6) Supply Current vs. Input Voltage RP550L001B VOUT = 1.8 V (VIN = 5.5 V) RP550L001B 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 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 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 Output Current IOUT(m A) Efficiency (%) VIN=5.0V, VMODE=0V VIN=4.3V, VMODE=0V VIN=VMODE=5.0V VIN=VMODE=4.3V 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage VIN (V) Supply Current (uA) Closed Loop Open Loop

NO.EC-285-170906 7) Output Voltage Waveform RP550L001B VOUT = 0.6 V (VIN = 3.6 V) RP550L001B VOUT = 0.6 V (VIN = 3.6 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control RP550L001B VOUT = 0.8 V (VIN = 3.6 V) RP550L001B 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 -25 -20 -15 -10 -5 0 5 10 15 20 25 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 -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 -25 -20 -15 -10 -5 0 5 10 15 20 25 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA

NO.EC-285-170906 RP550L001B VOUT = 1.2 V (VIN = 3.6 V) RP550L001B VOUT = 1.2 V (VIN = 3.6 V) MODE = “L”, Auto-Switching Control MODE = “H”, Forced PWM Control RP550L001B VOUT = 1.8 V (VIN = 3.6 V) RP550L001B 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 -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 -25 -20 -15 -10 -5 0 5 10 15 20 25 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 -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 -25 -20 -15 -10 -5 0 5 10 15 20 25 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA

NO.EC-285-170906 RP550L001B VOUT = 3.3 V (VIN = 4.3 V) RP550L001B VOUT = 3.3 V (VIN = 4.3 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “H”, Forced PWM Control 8) Oscillator Frequency vs. Ambient Temperature 9) Oscillator Frequency vs. Input Voltage 10) Soft-start Time vs. Ambient Temperature -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 -25 -20 -15 -10 -5 0 5 10 15 20 25 Time t (μs) Output Ripple Voltage(AC) Vripple (V) -100 100 200 300 400 Inductor Current IL (mA) Output Voltage IL IOUT=10mA

NO.EC-285-170906 11) UVLO Detector/ Released Threshold vs. Ambient Temperature UVLO Detector Threshold UVLO Released Threshold 12) CE Input Voltage vs. Ambient Temperature CE ”H” Input Voltage (VIN = 5.5 V) CE ”L” Input Voltage (VIN = 2.3 V) 13) LX Limit Current vs. Ambient Temperature

NO.EC-285-170906 14) Nch. Transistor ON Resistance vs. Ambient Temperature 15) Pch. Transistor ON Resistance vs. Ambient Temperature 16）Load Transient Response RP550L001B (VIN = 3.6 V, VOUT = 0.6 V) RP550L001B (VIN = 3.6 V, VOUT = 0.6 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “L”, PWM/VFM Auto-Switching Control RP550L001B (VIN = 3.6 V, VOUT = 0.6 V) RP550L001B (VIN = 3.6 V, VOUT = 0.6 V) MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 0.50 0.55 0.60 0.65 0.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 0.50 0.55 0.60 0.65 0.70 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Voltage Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage 0.50 0.55 0.60 0.65 0.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 0.50 0.55 0.60 0.65 0.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Voltage Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage

NO.EC-285-170906 RP550L001B (VIN = 3.6 V, VOUT = 0.6 V) RP550L001B (VIN = 3.6 V, VOUT = 0.6 V) RP550L001B (VIN = 3.6 V, VOUT = 0.8 V) RP550L001B (VIN = 3.6 V, VOUT = 0.8 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “L”, PWM/VFM Auto-Switching Control RP550L001B (VIN = 3.6 V, VOUT = 0.8 V) RP550L001B (VIN = 3.6 V, VOUT = 0.8 V) MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 0.50 0.55 0.60 0.65 0.70 0.75 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) 0.50 0.55 0.60 0.65 0.70 0.75 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) Output Voltage Output Voltage Output Current 300mA-->800mA Output Current 800mA-->300mA 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 0.70 0.75 0.80 0.85 0.90 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Voltage Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 0.70 0.75 0.80 0.85 0.90 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Voltage Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage

NO.EC-285-170906 RP550L001B (VIN = 3.6 V, VOUT = 0.8 V) RP550L001B (VIN = 3.6 V, VOUT = 0.8 V) RP550L001B (VIN = 3.6 V, VOUT = 1.2 V) RP550L001B (VIN = 3.6 V, VOUT = 1.2 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “L”, PWM/VFM Auto-Switching Control RP550L001B (VIN = 3.6 V, VOUT = 1.2 V) RP550L001B (VIN = 3.6 V, VOUT = 1.2 V) MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 0.65 0.70 0.75 0.80 0.85 0.90 0.95 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) 0.65 0.70 0.75 0.80 0.85 0.90 0.95 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) Output Voltage Output Voltage Output Current 300mA-->800mA Output Current 800mA-->300mA 1.10 1.15 1.20 1.25 1.30 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 1.10 1.15 1.20 1.25 1.30 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage Output Voltage 1.10 1.15 1.20 1.25 1.30 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 1.10 1.15 1.20 1.25 1.30 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Current 1mA-->300mA Output Voltage Output Current 300mA-->1mA Output Voltage

NO.EC-285-170906 RP550L001B (VIN = 3.6 V, VOUT = 1.2 V) RP550L001B (VIN = 3.6 V, VOUT = 1.2 V) RP550L001B (VIN = 3.6 V, VOUT = 1.8 V) RP550L001B (VIN = 3.6 V, VOUT = 1.8 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “L”, PWM/VFM Auto-Switching Control RP550L001B (VIN = 3.6 V, VOUT = 1.8 V) RP550L001B (VIN = 3.6 V, VOUT = 1.8 V) MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 1.05 1.10 1.15 1.20 1.25 1.30 1.35 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) 1.05 1.10 1.15 1.20 1.25 1.30 1.35 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) Output Voltage Output Voltage Output Current 300mA-->800mA Output Current 800mA-->300mA 1.60 1.70 1.80 1.90 2.00 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 1.60 1.70 1.80 1.90 2.00 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage Output Voltage 1.60 1.70 1.80 1.90 2.00 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 1.60 1.70 1.80 1.90 2.00 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage Output Voltage

NO.EC-285-170906 RP550L001B (VIN = 3.6 V, VOUT = 1.8 V) RP550L001B (VIN = 3.6 V, VOUT = 1.8 V) RP550L001B (VIN = 5.0 V, VOUT = 3.3 V) RP550L001B (VIN = 5.0 V, VOUT = 3.3 V) MODE = “L”, PWM/VFM Auto-Switching Control MODE = “L”, PWM/VFM Auto-Switching Control RP550L001B (VIN = 5.0 V, VOUT = 3.3 V) RP550L001B (VIN = 5.0 V, VOUT = 3.3 V) MODE = “H”, Forced PWM Control MODE = “H”, Forced PWM Control 1.65 1.70 1.75 1.80 1.85 1.90 1.95 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) 1.65 1.70 1.75 1.80 1.85 1.90 1.95 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) Output Voltage Output Voltage Output Current 300mA-->800mA Output Current 800mA-->300mA 3.10 3.20 3.30 3.40 3.50 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 3.10 3.20 3.30 3.40 3.50 -200 0 200 400 600 800 1000 1200 1400 1600 1800 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage Output Voltage 3.10 3.20 3.30 3.40 3.50 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) 3.10 3.20 3.30 3.40 3.50 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 0 200 400 Output Current IOUT (mA) Output Current 1mA-->300mA Output Current 300mA-->1mA Output Voltage Output Voltage

NO.EC-285-170906 RP550L001B (VIN = 5.0 V, VOUT = 3.3 V) RP550L001B (VIN = 5.0 V, VOUT = 3.3 V) 17) Mode Switching RP550L001B (VIN = 3.6 V, VOUT = 1.2 V, IOUT = 1 mA) RP550L001B (VIN = 3.6 V, VOUT = 1.2 V, IOUT = 1 mA) RP550L001B (VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1 mA) RP550L001B (VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1 mA) 3.20 3.25 3.30 3.35 3.40 3.45 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) 3.20 3.25 3.30 3.35 3.40 3.45 -10 0 10 20 30 40 50 60 70 80 90 Time t (μs) Output Voltage V OUT (V) 200 400 600 800 1000 Output Current IOUT (mA) Output Voltage Output Voltage Output Current 300mA-->800mA Output Current 800mA-->300mA 1.10 1.15 1.20 1.25 1.30 -100 0 100 200 300 400 500 600 700 800 900 Time t (μs) Output Voltage VOUT (V) Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage 1.10 1.15 1.20 1.25 1.30 -100 0 100 200 300 400 500 600 700 800 900 Time t (μs) Output Voltage V OUT (V) 0 Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage 1.70 1.75 1.80 1.85 1.90 1.95 -100 0 100 200 300 400 500 600 700 800 900 Time t (μs) Output Voltage V OUT (V) 0 Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage 1.70 1.75 1.80 1.85 1.90 1.95 -100 0 100 200 300 400 500 600 700 800 900 Time t (μs) Output Voltage V OUT (V) 0 Mode Input Voltage V MODE (V) Output Voltage Mode Input Voltage

POWER DISSIPATION DFN3030-12 Ver. A i Standard Measurement Board Pattern 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 Standard Test Land Pattern JEDEC STD.51-7 Test Land Pattern Environment Mounting on Board (Wind Velocity=0m/s) Mounting on Board (Wind Velocity = 0 m/s) Board Material Glass cloth epoxy plastic (Double sided) Glass Cloth Epoxy Plastic (Four-Layer Board) Board Dimensions 40mm x 40mm x 1.6mm 76.2 mm × 114.3 mm × 1.6 mm Copper Ratio Top side: Approx. 50%, Back side: Approx. 50% Outer Layers (First and Fourth Layers): Less than 10% of 60 mm Square Inner Layers (Second and Third Layers): 100% of 74.2 mm Square Through-holes f 0.54mm x 32pcs f 0.85 mm × 64 pcs * The land pattern of Tab (Heat spreader), the inner layers and the backside pattern are connected by 0.3mm through-hole. Measurement Result (Ta = 25°C, Tjmax = 150°C) Standard Test Land Pattern JEDEC STD.51-7 Test Land Pattern Power Dissipation 1250mW 2440 mW Thermal Resistance qja = (150-25°C)/1.25W = 100°C/W qjc = 18°C/W qjc = 5.9°C/W IC Mount Area (mm) Power Dissipation vs. Ambient Temperature Measurement Board Pattern 76.2 114.3 JEDEC STD..51 -7

PACKAGE DIMENSIONS DFN3030-12 Ver. A i ∗ 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. 3.0 3.0 A B 0.1 INDEX 0.203 typ S 0.8 max. 0.25±0.05 0.5

0.05 M AB

1.7±0.1 6 1 C 0.35 2.5±0.1 Bottom View 0.05 S 0.40±0.05

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