RAA211403 RENESAS | Alldatasheet
Document overview
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- PDF pages: 26
Technical content
Datasheet sections
- 1.1 Block Diagram
- 1.2 Typical Applications
- 2.1 Pin Assignments
- 2.2 Pin Descriptions
- 3.1 Absolute Maximum Ratings
- 3.2 Recommended Operating Conditions
- 3.3 Thermal Specifications
- 3.4 Electrical Specifications
- 5.1 Peak Current and Propagation Delay
- 5.2 Soft-Start
- 5.3 Undervoltage Lockout
- 5.4 Enable Control
- 5.5 Overcurrent Protection (OCP)
- 5.6 Short Circuit
- 5.7 V OUT Overvoltage Protection (OVP)
- 5.8 Pre-Baised Output Voltage
- 5.9 Over-Temperature Protection (OTP)
- 5.10 Switching Frequency
- 5.11 Thermal Derating
- 5.12 Fault Summary
- 6.1 Input Capacitor
- 6.2 Output Capacitor
- 6.3 Inductor
- 6.4 Diode
Features
▪ 7V to 40V input supply range ▪ Up to 300mA output current ▪ IQ = 4µA at 40V, at no load conditions, switching ▪ IQ = 2.5µA at 40V at no load and no switching conditions ▪ RAA211403 is fixed 3.3V VOUT, RAA211405 is fixed 5V VOUT ▪ Minimum on-time of 75ns ▪ Variable frequency operation, frequency programmed by external inductor (4.7µH to 15µH) ▪ Pre-bias, monotonic, and smooth start-up ▪ Protections: Overcurrent (OC) Limit, input Undervoltage Lockout (UVLO), Over-Temperature Protection (OTP), output Overvoltage Protection (OVP) ▪ Accurate EN threshold ▪ Package: TSOT23-5 (2.9mm×1.63mm) Programmable Feature ▪ Inductor: Change switching frequency ▪ Enable: Turn on/off with external logic or connect EN to VIN Figure 1. Typical Application Circuit
1.1 Block Diagram
Figure 2. Block Diagram
1.2 Typical Applications
Figure 3. Typical Application Circuit (RAA211403) Table 1. Typical BOM for RAA211403
Figure 4. Typical Application Circuit (RAA211405) Table 2. Typical BOM for RAA211405
R16DS0267EU0103 Rev.1.03 Page 6 Dec 1, 2023 RAA211403, RAA211405 Datasheet 2. Pin Information
2.1 Pin Assignments
2.2 Pin Descriptions
Pin Number Pin Name Description 1V O U T Connect this pin to the output voltage of the regulator. This pin is also the bias supply for the IC after the device starts up and is in regulation. 2 GND Ground connection pin. 3E N The enable pin is high voltage tolerant and, therefore, can be directly connected to VIN or a logic voltage for enable and disable. Do not leave this pin floating. 4V I N The voltage input for the IC. The VIN pin is connected to the integrated MOSFET source and to a suitable voltage source within the IC operation range of this pin. 5S W Switch node pin. This pin is the phase node of the regulator and is connected to the drain of the integrated MOSFET. Connect this pin to the inductor and diode. SW EN VOUT VIN GND
R16DS0267EU0103 Rev.1.03 Page 7 Dec 1, 2023 RAA211403, RAA211405 Datasheet 3. Specifications
3.1 Absolute Maximum Ratings
Caution: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely impact product reliability and result in failures not covered by warranty.
3.2 Recommended Operating Conditions
3.3 Thermal Specifications
Parameter Minimum Maximum Unit VIN -0.3 42 V EN -0.3 V IN + 0.3 V SW -0.3 V IN + 0.3 V VOUT -0.3 7 V SW, 20ns Transient -6 V IN + 0.3 V Operating Junction Temperature -40 150 °C Maximum Storage Temperature Range -65 150 °C Human Body Model (Tested per JS-001-2017) - 2 kV Charged Device Model (Tested per JS-002-2018) - 1 kV Latch-Up (Tested per JESD78E; Class 2, Level A) - 100 mA Parameter Minimum Maximum Unit Input Voltage, V IN 74 0 V Output Current, IOUT 00 . 3 A Junction Temperature, TJ -40 +125 °C Parameter Package Symbol Conditions Typical Value Unit Thermal Resistance TSOT23-5 θJA[1] 1. θJA is measured in free air with the component mounted on RTKA211403DE0000BU/RTKA211405DE0000BU evaluation boards. Junction to ambient 90 °C/WθJA[2] 2. θJA is measured in free air with the component mounted on a high-effective thermal conductivity test board. See TB379. Junction to ambient 156 θJC[3] 3. For θJC, the case temperature location is the center of the package top surface. Junction to case 48
R16DS0267EU0103 Rev.1.03 Page 8 Dec 1, 2023 RAA211403, RAA211405 Datasheet
3.4 Electrical Specifications
TJ = -40°C to +125°C, VIN = 7V to 40V, unless otherwise noted. Typical values are at TA = +25°C. Boldface limits apply across the junction temperature range, -40°C to +125°C. Parameter Symbol Test Conditions Min [1] 1. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and are not production tested. Typ Max [1] Unit Supply Voltage VIN Voltage Range V IN - 7 - 40 V VIN Quiescent Current I Q EN = VIN = 40V, VOUT = 3.3V or 5V, no load operation, switching -4- µ A EN = VIN = 40V, VOUT > 3.3V or 5V, no load, no switching -2 . 5-µ A Shutdown Current I SH EN = 0V, VIN = 24, no switching - 0.1 1 µA VIN Undervoltage Lockout - V IN rising 6.0 6.5 7 V VIN Undervoltage Hysteresis - - - 550 - mV Output Voltage VOUT Valley Comparator Threshold VOUT RAA211403, VIN = 12V, no load 3.2 3.3 3.4 V RAA211405, VIN = 12V, no load 4.8 4.95 5.1 V Overvoltage Protection OVP RAA211403 - 3.63 - V RAA211405 - 5.5 - V Enable Voltage EN High Level Input Voltage V ENH - 1.13 1.23 1.33 V EN Hysteresis - - - 75 - mV EN Leakage Current - EN = V IN = 40V - 0 - µA Timer Control Minimum On-Time t ON_MIN VIN = 12V - 75 - ns Internal Integrated MOSFETs On-Resistance r DS(ON)_H VIN = 12V - 1.0 - Ω Current Limit and Protection Current Limit I LIM VIN = 12V - 0.750 - A Current Limit Prop Delay - - - 50 - ns Thermal Shutdown TSD - - 160 - °C Thermal Hysteresis ∆TSD - - 20 - °C
40V across the -40°C to 125°C junction temperature range. current reference to turn the MOSFET off, and an output voltage valley threshold to turn the MOSFET back on. The following briefly describes the operation of the regulators. When the MOSFET is on, the inductor current rises linearly depending on the inductor and input voltage values. The MOSFET is switched off when the inductor current reaches the fixed ILIM current threshold of 750mA (typical). cycle is fixed. Therefore, an increase in the load current is met by an increase in the switching frequency. The no-load switching quiescent current (IQ) at input 40V is 4µA.
5.1 Peak Current and Propagation Delay
propagation delay, the peak current tends to be higher than 750mA. The propagation delay is typically 50ns. Use Equation 1 to approximately calculate the actual inductor peak current. Figure 39. Peak Inductor Current: RAA211403 Figure 40. Peak Inductor Current: RAA211405
5.2 Soft-Start
a longer VOUT ramp, and a startup with no load generates a faster ramp. Soft-start time is approximately defined by Equation 2. RTKA211405DE00BU) is given in Table 3, Table 4, and Figure 41 to Figure 46. Table 3. Approximate Soft-Start Times (RAA211403)
- Test conditions: V IN = 24V, COUT = 22µF (PN:GRM187R61A226ME15), L = 15µH (PN:74438335150), Power supply:
Table 4. Approximate Soft-Start Times (RAA211405)
- Test conditions: V IN = 24V, COUT = 22µF (PN:GRM219R61C226ME15), L = 10µH (PN:74438335100), Power supply:
Figure 41. Soft-Start (No Load): RAA211403 Fi gure 42. Soft-Start (No Load): RAA211405
5.3 Undervoltage Lockout
during VIN turn-off and turn-on. Figure 43. Soft-Start (VIN = 24V): RAA211403 Figure 44. Soft-Start (V IN = 24V): RAA211405 Figure 45. Soft-Start (Resistive Full Load): RAA211403 Figure 46. Soft-Start (Resistive Full Load): RAA211405
5.4 Enable Control
Figure 47. Typical Application Circuit Diagram with VIN UVLO Programming by ENABLE Figure 48. Timing Diagram with EN Turn-On and VIN UVLO Turn-Off
R16DS0267EU0103 Rev.1.03 Page 19 Dec 1, 2023 RAA211403, RAA211405 Datasheet
5.5 Overcurrent Protection (OCP)
RAA211403 and RAA211405 have built-in peak current protection with control. The MOSFET current is constantly monitored to turn off the MOSFET at 750mA (typical) peak current.
5.6 Short Circuit
The devices operate on boundary current mode during a short-circuit condition. The regulator still switches based on the control previously described. The output current during a short-circuit condition is given by Equation 5 and shown in Figure 17 to Figure 20:
5.7 V OUT Overvoltage Protection (OVP)
RAA211403 and RAA211405 have an output overvoltage protection. The internal overvoltage comparator compares the FB pin 110% of the reference voltage (see Figure 2). When this voltage exceeds 110% of the nominal, the regulator turns off the MOSFET. The MOSFET turns back on when the VOUT voltage goes below the VOUT valley threshold defined by the controller.
5.8 Pre-Baised Output Voltage
The part functions per the control scheme highlighted in the block diagram with an existing output voltage on the output pin. Figure 15 and Figure 16 show the start-up signals when the controller is enabled with pre-existing output voltage. The start-up is smooth, monotonic, and free from any glitches. The part shuts off when the biased output voltage is above the VOUT comparator’s valley threshold, and no switching signal is given to the FET. This feature is useful in systems with paralleled power supplies for redundancy (to maintain high reliability) without the addition of any additional circuitry. This feature can be used as power saving feature, as the typical IQ of the part is 2.5µA at no load and no switching conditions.
5.9 Over-Temperature Protection (OTP)
Over-temperature protection (OTP) limits the maximum junction temperature in the devices. This protection limits total power dissipation by shutting off the regulator when the junction temperature of the ICs exceeds 160°C (typical). There is a 20°C hysteresis for OTP . After the junction temperature drops below 140°C, the devices resume operation by stepping through soft-start. (EQ. 5) IOUT Ipeak
5.10 Switching Frequency
maximum switching frequency is dependent on inductance and peak current. and RTKA211405DE0000BU) is shown in Figure 49 to Figure 54. The switching frequency can be approximately given by Equation 6. Figure 49. Switching Frequency vs Input Voltage Figure 50. Switching Frequency vs Input Voltage Figure 51. Switching Frequency vs Load Current Figure 52. Switching Frequency vs Load Current
5.11 Thermal Derating
5.12 Fault Summary
next, the chip starts normally according to the EN state. Figure 53. Switching Frequency vs Load Current Figure 54. Switching Frequency vs Load Current reset state when UVLO is satisfied. is met, internal circuit monitor OT hysteresis. limit, the MOSFET turns off. VOUT Short Immediate Device operates in current limit mode.
R16DS0267EU0103 Rev.1.03 Page 22 Dec 1, 2023 RAA211403, RAA211405 Datasheet 6. Component Selection
6.1 Input Capacitor
The input capacitor in a buck converter maintains the input voltage by suppressing the voltage ripple induced by discontinuous switching current. Renesas recommends using low ESR/low ESL ceramic capacitors across the input of the regulator. When selecting ceramic capacitors for power supply applications, it is important to consider that the effective capacitance reduces with DC bias voltage across it. Therefore, consult the capacitor datasheet to understand the impact of this effect. Renesas also recommends using X5R/X7R dielectric ceramic capacitors because of their small temperature coefficient. In addition, as RAA211403/405 are low quiescent current regulators, picking an input capacitor with a minimum voltage rating of 50V with a low leakage current is advised. Choose a input capacitor of minimum 4.7µF. If the input to the regulator is fed through a high-impedance path, Renesas recommends adding an electrolytic capacitor and the ceramic capacitor to dampen the input voltage oscillation effects.
6.2 Output Capacitor
Output capacitor selection impacts the steady state and transient performance of the buck converter. Factors such as output ripple voltage, output voltage excursion during transients, and output voltage regulation should be considered when selecting the output capacitor. Renesas recommends using low ESR/low ESL X5R/X7R dielectric ceramic for the output capacitor with a minimum voltage rating of 10V for RAA211403 and 16V for RAA211405. It is important to consider that the effective capacitance reduces with DC bias voltage across it. Therefore, consult the capacitor datasheet to understand the impact of this effect. Use Equation 7 to approximate the output voltage ripple, where IPEAK is the peak inductor current from Equation 1. Use Equation 7 for initial capacitor selection. Select the final value based on testing a prototype board, capacitor DC bias derating, and capacitor ESR. Output capacitance determines the output voltage ripple and VOUT regulation for RAA211403/405. Choose a minimum of 10µF for the smallest area or a larger output capacitor to reduce ripple and provide tighter voltage regulation (see Figure 31 to Figure 38).
6.3 Inductor
Select an inductor with the lowest possible DC resistance (DCR) to minimize power losses. The continuous current rating of the inductor should be high enough to accommodate the DC load current and AC ripple current with an additional margin for overload conditions. The saturation current rating should be more than the peak inductor current. The factory recommends a minimum inductance of 4.7µH or higher with a minimum saturation current of 1A. See Figure 39 and Figure 40 for inductor peak current values with different inductances.
6.4 Diode
The devices require a freewheeling diode for the inductor current to flow when the internal high-side MOSFET turns off. Select a diode with a reverse voltage rating at least 20% higher than the maximum input voltage. The continuous current rating of the diode should be greater than the highest output current. Select a diode with low forward voltage drop and fast reverse recovery time for better efficiency. For operation at high temperatures, Renesas recommends using a high-quality Schottky, as diode leakage increases the current consumption of the application. Renesas recommends a minimum reverse breakdown voltage of 50V, a continuous current rating of 0.5 A, and a peak current rating of 1A. (EQ. 7) VRIPPLE C LI PEAK IOUT– 2 2COUT VOUT VIN =
guidelines are recommended to achieve good performance. step-down converter and should be the first component to be placed in the layout. ▪ The copper area of the SW node should not be more than needed. Place the inductor close to the regulator. ▪ Place an output capacitor close to the inductor. ▪ Place and route the power component to keep the power loop area minimum and short as possible. ▪ Keep all the power component to the same side of the PCB. ▪ Include thermal vias, as necessary, to improve heat dissipation. The recommended PCB board layout example is shown in Figure 55 and Figure 56. Figure 55. Layout (Top Layer) Figure 56. Layout (Bottom Layer)
R16DS0267EU0103 Rev.1.03 Page 24 Dec 1, 2023 RAA211403, RAA211405 Datasheet 8. Package Outline Drawing For the most recent package outline drawing, see P5.064B. P5.064B
5 Lead Thin Small Outline Transistor (TSOT) Plastic Package
Rev 3, 2/2022
R16DS0267EU0103 Rev.1.03 Page 25 Dec 1, 2023 RAA211403, RAA211405 Datasheet 9. Ordering Information 10. Revision History Part Number[1][2] 1. These Pb-free plastic packaged products empl oy special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J-STD-020. 2. For Moisture Sensitivit y Level (MSL), see the RAA211403, RAA211405 product pages. For more information about MSL, see TB363. Part Marking[3] 3. The part marking is located on the bottom of the part. Package Description[4] (RoHS Compliant) 4. For the Pb-Free Reflow Profile, see TB493. Pkg. Dwg # Carrier Type [5] 5. See TB347 for details about reel specifications. Temp. Range RAA2114034GP3#JA0 403 TSOT-23 P5.064B Reel, 3k -40 to +125°C RAA2114054GP3#JA0 405 RTKA211403DE0000BU RAA211403 Evaluation Board RTKA211405DE0000BU RAA211405 Evaluation Board Revision Date Description 1.03 Dec 1, 2023 Updated COUT information in Tables 1 and 2. Updated Equation 6. 1.02 Jul 3, 2023 Changed POD information from P5.064D to P5.064B throughout the document. Added Note 4 to the ordering information table. 1.01 Jun 4, 2023 Updated Figures 51 and 52. 1.00 May 16, 2023 Initial release.
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