TPS51225EVM-133

www.ti.com Table of Contents User’s Guide LM3475 Buck Controller Evaluation Module User's Guide ABSTRACT The TPS51225EVM-133 evaluation module (EVM) uses the TPS51225. The TPS51225 is a D-CAP™ mode, dual synchronous step-down controller with 5-V and 3.3-V low-dropout regulators (LDO). The EVM provides fixed 5-V and 3.3-V outputs at up to 10 A each, from a 12-V input bus. Table of Contents 1 Description.............................................................................................................................................................................. 3 1.1 Typical Applications............................................................................................................................................................3 1.2 Features............................................................................................................................................................................. 3 2 Electrical Performance Specifications................................................................................................................................. 3 3 Schematic................................................................................................................................................................................4 4 Test Setup................................................................................................................................................................................5 4.1 Test Equipment.................................................................................................................................................................. 5 4.2 Recommended Test Setup.................................................................................................................................................6 5 Configurations........................................................................................................................................................................ 7 6 Test Procedure........................................................................................................................................................................ 8 6.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 8 6.2 List of Test Points............................................................................................................................................................... 8 6.3 Equipment Shutdown......................................................................................................................................................... 8 7 Performance Data and Typical Characteristic Curves........................................................................................................ 9 7.1 5-V Efficiency..................................................................................................................................................................... 9 7.2 5-V Load Regulation.......................................................................................................................................................... 9 7.3 3.3-V Efficiency................................................................................................................................................................ 10 7.4 3.3-V Load Regulation..................................................................................................................................................... 10 7.5 Enable Turn-On/Turn-Off..................................................................................................................................................11 7.6 Output Ripple....................................................................................................................................................................11 7.7 Switching Node................................................................................................................................................................ 12 7.8 5-V Output Transient with Auto-skip Mode.......................................................................................................................12 7.9 3.3-V Output Transient with Auto-skip Mode....................................................................................................................13 7.10 Output Prebias Turn-On................................................................................................................................................. 13 7.11 Thermal Image............................................................................................................................................................... 14 8 EVM Assembly Drawing and PCB Layout.......................................................................................................................... 15 9 Bill of Materials..................................................................................................................................................................... 18 10 Revision History................................................................................................................................................................. 18 List of Figures Figure 3-1. TPS51225EVM-133 Schematic.................................................................................................................................4 Figure 4-1. Tip and Barrel Measurement for VOUT Ripple............................................................................................................5 Figure 4-2. TPS51225EVM-133 Recommended Test Setup....................................................................................................... 6 Figure 7-1. 5-V Efficiency.............................................................................................................................................................9 Figure 7-2. 5-V Load Regulation..................................................................................................................................................9 Figure 7-3. 3.3-V Efficiency........................................................................................................................................................10 Figure 7-4. 3.3-V Load Regulation.............................................................................................................................................10 Figure 7-5. EN1 and EN2 Turn-On............................................................................................................................................ 11 Figure 7-6. EN1 and EN2 Turn-Off.............................................................................................................................................11 Figure 7-7. 5-V Output Ripple.................................................................................................................................................... 11 Figure 7-8. 3.3-V Output Ripple................................................................................................................................................. 11 Figure 7-9. 5-V Switching Node.................................................................................................................................................12 Figure 7-10. 3.3-V Switching Node............................................................................................................................................12 Figure 7-11. 5-V Output Transient from DCM to CCM...............................................................................................................12 SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 1 Trademarks www.ti.com Figure 7-12. 5-V Output Transient from CCM to DCM...............................................................................................................12 Figure 7-13. 3.3-V Output Transient from DCM to CCM............................................................................................................13 Figure 7-14. 3.3-V Output Transient from CCM to DCM............................................................................................................13 Figure 7-15. 5-V Output, 2.5-V Prebias Start-Up.......................................................................................................................13 Figure 7-16. 3.3-V Output, 2-V Prebias Start-Up.......................................................................................................................13 Figure 7-17. Top Board at 12 VIN, 5 V/10 A, 3.3 V/10 A, 25°C Ambient Without Airflow........................................................... 14 Figure 8-1. TPS51225EVM-133 Top Layer Assembly Drawing.................................................................................................15 Figure 8-2. TPS51225EVM-133 Bottom Assembly Drawing..................................................................................................... 15 Figure 8-3. TPS51225EVM-133 Top Copper.............................................................................................................................16 Figure 8-4. TPS51225EVM-133 Layer 2 Copper.......................................................................................................................16 Figure 8-5. TPS51225EVM-133 Layer 3 Copper.......................................................................................................................17 Figure 8-6. TPS51225EVM-133 Layer 4 Copper.......................................................................................................................17 List of Tables Table 2-1. TPS51225EVM-133 Electrical Performance Specifications........................................................................................3 Table 5-1. EN1 Selection............................................................................................................................................................. 7 Table 5-2. EN2 Selection............................................................................................................................................................. 7 Table 6-1. The Functions of Each Test Points............................................................................................................................. 8 Table 9-1. EVM Components List.............................................................................................................................................. 18 Trademarks D-CAP™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 2 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Description 1 Description The TPS51225EVM-133 is designed to use a regulated 12-V bus to produce regulated 5-V and 3.3-V outputs at up to 10 A each of load current. The EVM demonstrates the TPS51225 as a computing-system power supply. It also provides 5-V and 3.3-V LDOs and 14-V voltage-current protection (VCP) for charge pump applications. 1.1 Typical Applications • • Notebook computers, netbooks, tablet computers Servers, telecom motherboards, embedded computers 1.2 Features The TPS51225EVM-133 features: • • • • • 10-A DC steady-state output current for 5-V and 3.3-V outputs Supports pre-bias output voltage start-up S1 for Enable/Disable output1 S2 for Enable/Disable output2 Convenient test points for probing critical waveforms 2 Electrical Performance Specifications Table 2-1. TPS51225EVM-133 Electrical Performance Specifications PARAMETER TEST CONDITIONS MIN TYP MAX 8 12 20 UNITS INPUT CHARACTERISTICS Voltage range VIN V Maximum input current VIN = 8 V, 5 VOUT, 1/10 A, 3.3 VOUT, 2/10 A 7.3 A No load input current VIN = 20 V, 5 VOUT, 1/0 A, 3.3 VOUT, 2/0 A with auto-skip mode 1.5 mA OUTPUT CHARACTERISTICS Output voltage VOUT1 5 Line regulation (VIN = 8 V–20 V) 0.1% Output voltage regulation Load regulation (VIN = 12 V, VOUT1/0 A–10 A with auto-skip mode), Voutput2: off 0.5% Output voltage ripple VIN = 12 V, VOUT1/ 10 A , Voutput2: off Output load current VIN = 8 V–20 V Output over current VIN = 12 V Switching frequency VIN = 12 V, Voutput1/10 A Efficiency VIN = 12 V, Vout1/10 A, Vout2: off V 32 0 8 mVpp 10 A 12.9 A 300 kHz 95.69% Output voltage Vout2 3.3 Line regulation (VIN = 8 V–20 V) 0.1% Output voltage regulation Load regulation (VIN = 12 V, VOUT 2/0 A–10 A with auto-skip mode), Voutput1: off 0.5% Output voltage ripple VIN = 12 V, Vout2/10 A , Voutput1: off Output load current VIN = 8 V–20 V Output over current VIN = 12 V Switching Frequency VIN = 12 V, Voutput2/10 A Efficiency VIN = 12 V, Vout2 at 10 A, Vout1: off 30 0 8 mVpp 10 A 12.9 A 355 kHz 94.33% Operating temperature SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback V 25 °C LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 3 Schematic www.ti.com 3 Schematic Figure 3-1. TPS51225EVM-133 Schematic 4 LM3475 Buck Controller Evaluation Module User's Guide SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup 4 Test Setup 4.1 Test Equipment Voltage Source: The input voltage, VIN, should be a 0-V to 20-V variable DC source capable of supplying 10 ADC. Connect VIN to J1 as shown in Figure 4-2. Multimeters: • • • • V1: VIN at TP1 (VIN) and TP6 (GND) V2: Vout1 at TP2 (Vout1) and TP7 (GND) V3: Vout2 at TP3 (Vout2) and TP8 (GND) A1: VIN input current Output Load: The output load should be an electronic constant resistance mode load capable of 0 ADC to 15 ADC. Oscilloscope: A digital or analog oscilloscope can measure the output ripple. Set the oscilloscope for the following: • • • • • 1-MΩ impedance 20-MHz bandwidth AC coupling 4-µs/division horizontal resolution 50-mV/division vertical resolution Use test points TP2 (Vout1), TP3 (Vout2), TP7 (GND), and TP8 (GND) for measuring the output ripple voltage by placing the oscilloscope probe tip through TP2/TP3 and holding the ground barrel on TP7/TP8 as shown in Figure 4-1. Using a leaded ground connection can induce additional noise due to the large ground loop. Metal Ground Barrel Probe Tip TP2/TP3 TP7/TP8 Figure 4-1. Tip and Barrel Measurement for VOUT Ripple Fan: Some of the components in this EVM can approach temperatures of 60°C during operation. A small fan capable of 200–400 linear feet per minute (LFM) is recommended to reduce component temperatures while the EVM is operating. Do not probe the EVM while the fan is not running. Recommended Wire Gauge: 1. VIN to J1(12-V input): The recommended wire size is 1× American wire gauge (AWG) #14 per input connection, with the total length of wire less than four feet (2-feet input, 2-feet return). 2. J2, J3 to Load1, Load2: The minimum recommended wire size is AWG #14, with the total length of wire less than four feet (2-feet output, 2-feet return). SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 5 Test Setup www.ti.com 4.2 Recommended Test Setup FAN V2 Load1 + V1 + A1 - DC Source Vin + V3 Load2 - Figure 4-2. TPS51225EVM-133 Recommended Test Setup Figure 4-2 is the recommended test setup for evaluating the EVM. Working at an ESD workstation, make sure that any wrist straps, bootstraps, or mats are connected referencing the user to earth ground before power is applied to the EVM. Input Connections: 1. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VIN to 10-A maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 4-2. 2. Connect a voltmeter, V1, at TP1 (VIN) and TP6 (GND) to measure the input voltage. 3. Connect a current meter, A1, to measure the input current. Output Connections: 1. 2. 3. 4. Connect Load1 to J2 and set Load to constant resistance mode to sink 0 ADC before VIN is applied Connect a voltmeter, V2, at TP2 (Vout1) and TP7 (GND) to measure the output1 voltage. Connect Load2 to J3 and set Load to constant resistance mode to sink 0 ADC before VIN is applied. Connect a voltmeter, V3, at TP3 (Vout2) and TP8 (GND) to measure the output2 voltage. Other Connections: Place a fan as shown in Figure 4-2 and turn it on, making sure air is flowing across the EVM. 6 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Configurations 5 Configurations Make all switcher selections before applying power to the EVM. Configure this EVM per the following: Enable1 Selection The EN1 pin can be set by S1. Default setting: S1 to OFF to disable the Output1 Table 5-1. EN1 Selection Switcher set to SKIPSEL Selection ON Enable the Output1 OFF Disable the Output1 Enable2 Selection Default setting: S2 to OFF to disable the Output2 Table 5-2. EN2 Selection Switcher set to SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback Enable Selection ON Enable the Output2 OFF Disable the Output2 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 7 Test Procedure www.ti.com 6 Test Procedure 6.1 Line/Load Regulation and Efficiency Measurement Procedure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Set up the EVM as described in Section 4 and Figure 4-2. Ensure Load1 and Load2 are set to constant resistance mode and to sink 0 ADC. Ensure the configuration settings per Section 5. Ensure S1 and S2 are in the OFF position before VIN is applied. Increase VIN from 0 V to 12 V. Use V1 to measure input voltage. Switch S1 to the ON position to enable the Output1. Use V2 to measure Vout1 voltage. Vary Load1 from 0–10 ADC. Vout1 should remain in load regulation. Vary VIN from 8 V to 20 V. Vout1 should remain in line regulation. Switch S1 to the OFF position to disable the Output1. Switch S2 to the ON position to enable the Output2. Use V3 to measure Vout2 voltage. Vary Load2 from 0–10 ADC. Vout2 should remain in load regulation. Vary VIN from 8 V to 20 V. Vout2 should remain in line regulation. Switch S2 to the OFF position to disable the Output2. Decrease Load1 and Load2 to 0 A. Decrease VIN to 0 V. 6.2 List of Test Points Table 6-1. The Functions of Each Test Points Test Points Name Description TP1 Vin 12-V input TP2 Vout1 5-V output TP3 Vout2 3.3-V output TP4 VREG5 5-V LDO output TP5 VREG3 3.3-V LDO output TP6 GND Ground TP7 GND Ground TP8 GND Ground TP9 GND Ground TP10 PGOOD Power Good TP11 EN2 Enable2 TP12 EN1 Enable1 TP13 VCLK Clock output for charge pump TP14 SW1 Switching node of Output1 TP15 SW2 Switching node of Output2 TP16 VCP 14-V charge bump voltage TP17 GND Ground 6.3 Equipment Shutdown 1. Shut down Load1 and Load2. 2. Shut down VIN. 3. Shut down the fan. 8 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Performance Data and Typical Characteristic Curves 7 Performance Data and Typical Characteristic Curves Figure 7-1 through Figure 7-17 present typical performance curves for the TPS51225EVM-133. 7.1 5-V Efficiency 100 90 Efficiency (%) 80 70 60 50 VIN = 12 V VIN = 20 V VIN = 8 V 40 0.001 0.01 0.1 Output Current (A) 1 10 G001 Figure 7-1. 5-V Efficiency 7.2 5-V Load Regulation 5.08 Output Voltage (V) 5.06 5.04 5.02 5 4.98 VIN = 12 V VIN = 20 V VIN = 8 V 4.96 0.001 0.01 0.1 Output Current (A) 1 10 G002 Figure 7-2. 5-V Load Regulation SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 9 Performance Data and Typical Characteristic Curves www.ti.com 7.3 3.3-V Efficiency 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 12 V VIN = 20 V VIN = 8 V 10 0 0.001 0.01 0.1 Output Current (A) 1 10 G003 Figure 7-3. 3.3-V Efficiency 7.4 3.3-V Load Regulation 3.38 Output Voltage (V) 3.36 3.34 3.32 3.3 3.28 VIN = 12 V VIN = 20 V VIN = 8 V 3.26 0.001 0.01 0.1 Output Current (A) 1 10 G004 Figure 7-4. 3.3-V Load Regulation 10 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Performance Data and Typical Characteristic Curves 7.5 Enable Turn-On/Turn-Off TPS5 1225 EVM-133 Enable Start-up Test Condition: 12 VIN, 5 V/5 A, 3.3 V/5 A CH1: EN TPS5 1225 EVM-133 Enable Shutdown Test Condition: 12 VIN, 5 V/5 A, 3.3 V/5 A CH1: EN CH2: 5 VOUT CH2: 5 VOUT CH3: 3.3 VOUT CH3: 3.3 VOUT CH4: PGOOD CH4: PGOOD TIME 400 µs/Div TIME 400 µs/Div Figure 7-5. EN1 and EN2 Turn-On Figure 7-6. EN1 and EN2 Turn-Off 7.6 Output Ripple TPS5 1225 EVM-133 5 V Output Ripple Test Condition: 12 VIN, 5 V/10 A, 3.3 V/0 A TPS5 1225 EVM-133 3.3 V Output Ripple CH1: 3.3 V Output Ripple CH1: 5 V Output Ripple TIME 4 µs/Div TIME 4 µs/Div Figure 7-7. 5-V Output Ripple SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback Test Condition: 12 VIN, 5 V/0 A, 3.3 V/10 A Figure 7-8. 3.3-V Output Ripple LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 11 Performance Data and Typical Characteristic Curves www.ti.com 7.7 Switching Node TP5 1225 EVM-133 5 VOUT Switching Node Test Condition: 12 VIN, 5 V/10 A, 3.3 V/0 A TPS5 1225 EVM-133 3.3 VOUT Switching Node Test Condition: 12 VIN, 5 V/0 A, 3.3 V/10 A CH1: SW2 CH1: SW1 TIME 400 ns/Div TIME 200 ns/Div Figure 7-9. 5-V Switching Node Figure 7-10. 3.3-V Switching Node 7.8 5-V Output Transient with Auto-skip Mode TPS5 1225CEVM-133 5 VOUT Output Transient from DCM to CCM Test Condition: 12 VIN, 5 V/0 A-5 A, 3.3 V/0 A TPS5 1225CEVM-133 5 VOUT Output Transient from CCM to DCM CH1: 5 VOUT Output CH1: 5 VOUT Output CH2: 5 VOUT Current CH2: 5 VOUT Current TIME 40 µs/Div TIME 40 µs/Div Figure 7-11. 5-V Output Transient from DCM to CCM 12 Test Condition: 12 VIN, 5 V/0 A-5 A, 3.3 V/0 A Figure 7-12. 5-V Output Transient from CCM to DCM LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com Performance Data and Typical Characteristic Curves 7.9 3.3-V Output Transient with Auto-skip Mode TPS5 1225CEVM-133 Test Condition: 3.3 VOUT Output Transient 12 VIN, 5 V/0 A, 3.3 V/0 A-5 A from DCM to CCM TPS5 1225 EVM-133 3.3 VOUT Output Transient from CCM to DCM CH1: 3.3 VOUT Output CH1: 3.3 VOUT Output CH2: 3.3 VOUT Current CH2: 3.3 VOUT Current Test Condition: 12 VIN, 5 V/0 A, 3.3 V/0 A-5 A TIME 40 µs/Div TIME 40 µs/Div Figure 7-13. 3.3-V Output Transient from DCM to CCM Figure 7-14. 3.3-V Output Transient from CCM to DCM 7.10 Output Prebias Turn-On TPS5 1225CEVM-133 5 VOUT 2.5 V Pre-bias Enable Start-up Test Condition: 12 VIN, 5 V/0 A, 3.3 V/0 A TPS5 1225CEVM-133 3.3 VOUT 2 V Pre-bias Enable Start-up Test Condition: 12 VIN, 5 V/0 A, 3.3 V/0 A CH1: EN1 and EN2 CH1: EN1 and EN2 CH2: 5 VOUT CH2: 5 VOUT CH3: 3.3 VOUT CH3: 3.3 VOUT CH4: PGOOD CH4: PGOOD TIME 400 µs/Div TIME 400 µs/Div Figure 7-15. 5-V Output, 2.5-V Prebias Start-Up SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback Figure 7-16. 3.3-V Output, 2-V Prebias Start-Up LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 13 Performance Data and Typical Characteristic Curves www.ti.com 7.11 Thermal Image Figure 7-17. Top Board at 12 VIN, 5 V/10 A, 3.3 V/10 A, 25°C Ambient Without Airflow 14 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com EVM Assembly Drawing and PCB Layout 8 EVM Assembly Drawing and PCB Layout The following figures (Figure 8-1 through Figure 8-6) show the design of the TPS51225EVM-133 printed circuit board. The EVM has been designed using four layers, 2-oz copper circuit board. Figure 8-1. TPS51225EVM-133 Top Layer Assembly Drawing Figure 8-2. TPS51225EVM-133 Bottom Assembly Drawing SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 15 EVM Assembly Drawing and PCB Layout www.ti.com Figure 8-3. TPS51225EVM-133 Top Copper Figure 8-4. TPS51225EVM-133 Layer 2 Copper 16 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback www.ti.com EVM Assembly Drawing and PCB Layout Figure 8-5. TPS51225EVM-133 Layer 3 Copper Figure 8-6. TPS51225EVM-133 Layer 4 Copper SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 17 Bill of Materials www.ti.com 9 Bill of Materials This is the EVM components list according to the schematic shown in Figure 3-1. Table 9-1. EVM Components List Qty RefDes Description MFR Part Number 4 C1, C2, C3, C4 Capacitor, ceramic, 22 µF, 25 V, X5R, 20%, 1210 Murata GRM32ER61C226KE20L 6 C10, C15, C19, C20, C21, Capacitor, ceramic, 0.1 µF, 50 V, X7R, 10%, 0603 C22 STD STD 4 C5, C6, C26, C27 Capacitor, ceramic, 0.01 µF, 50 V, X7R, 10%, 0603 STD STD 3 C7, C8, C9 Capacitor, ceramic, 1 µF, 10 V, X7R, 10%, 0603 STD STD 2 C11, C12 Capacitor, POS, 330 µF, 6.3 VDC, 18 mΩ, 20%, 7343 Sanyo 6TPE330MIL 2 C16, C17 Capacitor, POS, 470 µF, 4 VDC, 18 mΩ, 20%, 7343 Sanyo 4TPE470MIL 1 D1 Diode, Schottky barrier array, 70 mA, 40 V, SOT363 BAS40DW-04 Diodes 1 L1 Inductor, SMT, 3.3 µH, 12.3 A, 9.2 mΩ, 11.2 mm × 10.0 mm Toko FDVE1040-H-3R3M 1 L2 Inductor, SMT, 2.2 µH, 14.2 A, 6.1 mΩ, 11.2 mm × 10.0 mm Toko FDVE1040-H-2R2M 2 Q1, Q2 MOSFET, Dual N-Chan, 30 V, 25 A, QFN-8 POWER TI CSD87352Q5D 9 R1, R3, R4, R5, R7, R19, R20, R21, R22 Resistor, chip, 0 Ω, 1/16W, 1%, 0603 STD STD 2 R10, R11 Resistor, chip, 30.1 kΩ, 1/16W, 1%, 0603 STD STD 1 R18 Resistor, chip, 51.1 kΩ, 1/16W, 1%, 0603 STD STD 1 R12 Resistor, chip, 100 kΩ, 1/16W, 1%, 0603 STD STD 1 R14 Resistor, chip, 15.0 kΩ, 1/16W, 1%, 0603 STD STD 2 R15, R17 Resistor, chip, 10.0 kΩ, 1/16W, 1%, 0603 STD STD 1 R16 Resistor, chip, 7.50 kΩ, 1/16W, 1%, 0603 STD STD 1 R6 Resistor, chip, 2.21 Ω, 1/16W, 1%, 0603 STD STD 1 R2 Resistor, chip, 4.02 Ω, 1/16W, 1%, 0603 STD STD 1 U1 IC, Dual Synchronous Step-Down Controller with 5-V/3.3- TI V LDOs for Notebook System Power DFN-20 TPS51225RUK 10 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (June 2012) to Revision A (February 2022) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................3 • Updated the user's guide title............................................................................................................................. 3 18 LM3475 Buck Controller Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU735A – JUNE 2012 – REVISED FEBRUARY 2022 Submit Document Feedback IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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