TPS62873EVM-143

www.ti.com Table of Contents User’s Guide TPS62873 Buck Converter Evaluation Module User's Guide ABSTRACT This user’s guide describes the characteristics, operation, and use of TI's evaluation module (EVM) for the TPS62873-Q1 devices. The TPS62873EVM-143 is designed to help the user easily evaluate and test the operation and functionality of the TPS62873-Q1 buck converters. It also can be used to evaluate the TPS62870Q1, TPS62871-Q1, and TPS62872-Q1 devices. The EVM converts 2.7-V to 6.0-V input voltage to a regulated 0.75-V output voltage. The output current can go up to 15 A for the TPS62873EVM-143. This user’s guide includes setup instructions for the hardware, a printed-circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM). Table of Contents 1 Warning and Caution..............................................................................................................................................................2 2 Introduction.............................................................................................................................................................................3 3 Setup........................................................................................................................................................................................3 4 TPS62873EVM-143 Test Results............................................................................................................................................4 5 Board Layout...........................................................................................................................................................................4 6 Schematic and Bill of Materials.............................................................................................................................................7 List of Figures Figure 5-1. Top Silk......................................................................................................................................................................5 Figure 5-2. Top Layer...................................................................................................................................................................5 Figure 5-3. Layer 2...................................................................................................................................................................... 5 Figure 5-4. Layer 3...................................................................................................................................................................... 5 Figure 5-5. Layer 4...................................................................................................................................................................... 5 Figure 5-6. Layer 5...................................................................................................................................................................... 5 Figure 5-7. Layer 6...................................................................................................................................................................... 6 Figure 5-8. Layer 7...................................................................................................................................................................... 6 Figure 5-9. Bottom Layer............................................................................................................................................................. 6 Figure 6-1. TPS62873EVM-143 Schematic.................................................................................................................................7 List of Tables Table 2-1. Performance Specification Summary..........................................................................................................................3 Table 6-1. TPS62873EVM-143 BOM...........................................................................................................................................8 Trademarks All trademarks are the property of their respective owners. SLVUC13 – FEBRUARY 2022 Submit Document Feedback TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 1 Warning and Caution www.ti.com 1 Warning and Caution Caution Hot surface. Contact may cause burns. Do not touch! Caution 2 TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVUC13 – FEBRUARY 2022 Submit Document Feedback www.ti.com Introduction 2 Introduction The TPS62873-Q1 device is a high-frequency, synchronous step-down converter optimized for a small solution size and high efficiency. The devices focus on high-efficiency, step-down conversion over a wide output current range. At medium to heavy loads, the converter operates in PWM mode and automatically enters power save mode operation at light load to maintain high efficiency over the entire load-current range. The device is available in a 2.55-mm × 3.55-mm, 16-pin VQFN package. 2.1 Performance Specification Table 2-1 provides a summary of the TPS62873EVM-143 performance specifications. Table 2-1. Performance Specification Summary Specification Test Conditions Input voltage MIN 2.7 Output voltage setpoint Output current TYP MAX Unit 6.0 0.75 TPS62873EVM-143 0 V V 15.0 A 2.2 Modifications The printed-circuit board (PCB) for this EVM is designed to accommodate the different output current versions of this integrated circuit (IC). On the EVM, additional output capacitors can be added, the default output voltage can be changed, and the switching frequency can be modified. 2.2.1 Input and Output Capacitors Footprints for additional input capacitors and additional output capacitors are provided. These capacitors are not required for proper operation, but can be used to reduce the input and output voltage ripple and to improve the load transient response. For proper operation, the total output capacitance must remain within the recommended range described in the TPS6287x-Q1 Low Input Voltage, Adjustable-Frequency Step-Down Converter data sheet. 2.2.2 Output Voltage Setting The output voltage of U1 is set to a default of 0.75 V. Other default voltages can be set using appropriate values for the resistors R5 and R6. During operation, the output voltage can be changed using the I2C interface. For more details, see the TPS6287x-Q1 Low Input Voltage, Adjustable-Frequency Step-Down Converter data sheet. 2.2.3 Control Loop Compensation C1, C2, and R1 are used for compensating the control loop. If the output capacitors have been changed adjustments, of the component values in the compensation network can be necessary. For more details, see the TPS6287x-Q1 Low Input Voltage, Adjustable-Frequency Step-Down Converter data sheet. 2.2.4 Switching Frequency Setting The switching frequency is set to a default of 2.25 MHz. By changing the values of R3 and R4, the default switching frequency can be changed. For more details, see the TPS6287x-Q1 Low Input Voltage, AdjustableFrequency Step-Down Converter data sheet. 2.2.5 I2C Interface Output voltage, output voltage ramp time, soft-start time, and various control features can be controlled through the I2C interface. IC status information is also available. For more details, see the TPS6287x-Q1 Low Input Voltage, Adjustable-Frequency Step-Down Converter data sheet. 3 Setup This section describes how to correctly use the TPS62873EVM-143. 3.1 Connector Descriptions MH1 - VIN Positive input voltage connection from the input supply for the EVM J1-1 – VINsense, J1-2 – GNDsense Input voltage sense connections, measure the input voltage at this point. SLVUC13 – FEBRUARY 2022 Submit Document Feedback TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 3 Setup www.ti.com MH2 – GND Input return connection from the input supply for the EVM MH3 – VOUT Positive output voltage connection J2-1 – VOUTsense, J2-2 GNDsense Output voltage sense connections, measure the output voltage at this point. MH4 – GND Output return connection JP1 – EN EN pin jumper. Place the supplied jumper across ON and EN to turn on the IC. Place the jumper across OFF and EN to turn off the IC. JP2 – MODE/SYNC MODE/SYNC pin jumper. Place the supplied jumper across VIN and MODE/SYNC to force the device in fixed frequency PWM operation at all load currents. Place the jumper across MODE/SYNC and GND to enable power save mode. Connect a clock signal to MODE/SYNC referenced to GND to synchronize the switching frequency to the clock signal. J3 – PG The PG output appears on pin 1 of this header with a convenient ground on pin 2. J4 – SYNC_OUT At the SYNC_OUT output, the switching frequency is provided at pin 1 with a convenient ground on pin 2. J5 – I2C I2C connection configured for being used with the USB2ANY interface. 3.2 Hardware Setup To operate the EVM, set jumpers JP1 and JP2 to the desired positions per Section 3.1. Connect the input supply to MH1 and MH2, between VIN and GND, and connect the load to MH3 and MH4 between VOUT and GND. To evaluate the I2C features a USB2ANY interface can be connected to J5. For this interface, a software GUI is available here. 4 TPS62873EVM-143 Test Results The TPS62873EVM-143 was used to take the typical characteristics data in the TPS6287x-Q1 data sheet. See the TPS6287x-Q1 Low Input Voltage, Adjustable-Frequency Step-Down Converter data sheet for the performance of this EVM. 5 Board Layout This section provides the TPS62873EVM-143 board layout. The gerber files are available on the TPS62873EVM-143 tool page. 4 TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVUC13 – FEBRUARY 2022 Submit Document Feedback www.ti.com Board Layout Figure 5-1. Top Silk Figure 5-2. Top Layer Figure 5-3. Layer 2 Figure 5-4. Layer 3 Figure 5-5. Layer 4 Figure 5-6. Layer 5 SLVUC13 – FEBRUARY 2022 Submit Document Feedback TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 5 Board Layout www.ti.com Figure 5-7. Layer 6 Figure 5-8. Layer 7 Figure 5-9. Bottom Layer 6 TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVUC13 – FEBRUARY 2022 Submit Document Feedback www.ti.com Schematic and Bill of Materials 6 Schematic and Bill of Materials This section includes the TPS62873EVM-143 schematics and bills of materials. 6.1 Schematic Figure 6-1 shows the schematic of TPS62873EVM-143. TPS62873QWRXSRQ1 VSEL FSEL R3 - VIN n.c. n.c. 47 kΩ 0Ω R4 - GND 0Ω 6.2 kΩ n.c. n.c. fsw 1.5 MHz 2.25 MHz 2.5 MHz 3 MHz R5 - VIN n.c. n.c. 0Ω 47 kΩ R6 - GND 0Ω 6.2 kΩ n.c. n.c. VOUT 0.75 V 0.85 V 0.875 V 1.0 V I2C address 0x41 0x40 0x42 0x43 Figure 6-1. TPS62873EVM-143 Schematic SLVUC13 – FEBRUARY 2022 Submit Document Feedback TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 7 Schematic and Bill of Materials www.ti.com 6.2 Bill of Materials Table 6-1 lists the BOM for the TPS62873EVM-143. Table 6-1. TPS62873EVM-143 BOM 8 Qty Ref Des Value Description 6 C10, C11, C20, C21, C30, C31 Size Part Number MFR 0.47 µF Ceramic Capacitor, 10 V, X7S 0402 GCM155C71A474KE36D any 2 2 C12, C13 2.2 µF Ceramic Capacitor, 10 V, X7S 0603 CGA3E3X7S1A225K080AB TDK C14, C15 10 µF Ceramic Capacitor, 10 V, X7R 0805 GCM21BR71A106KE22 MuRata 6 C16, C17, C22, C23, C24, C25 22 µF Ceramic Capacitor, 10 V, X7R 1206 GCM31CR71A226KE02 MuRata 2 C32,C33 47 µF Ceramic Capacitor, 6.3 V, X7R 1210 GCM32ER70J476ME19L MuRata 2 C34, C35 100 µF Ceramic Capacitor, 6.3 V, X5R 1210 GRT32ER60J107ME13L MuRata 1 C19 100 µF Polymer Capacitor, 10 V 7.3 × 4.3 mm 10TQC100YF Panasonic 1 C1 1800 pF Ceramic Capacitor, 50 V, X7R 0402 1 C2, C3 10pF Ceramic Capacitor, 50 V, COG/NPO 0402 1 L1 110 nH Inductor 4.0 × 4.0 × 2.0 mm 1 R1 2.43 kΩ Resistor 1%, 0.1 W 0402 any 2 R2 100 kΩ Resistor 1%, 0.1 W 0402 any 1 R4 6.19 kΩ Resistor 1%, 0.1 W 0402 any 2 R6, R12 0Ω Resistor 1%, 0.1 W 0402 any 1 R7 10 kΩ Resistor 1%, 0.1 W 0402 any 2 R9, R10 2 kΩ Resistor 1%, 0.1 W 0402 1 U1 2.7-V to 6-V Input, 15-A, Fast Transient Synchronous Step-Down Converter with I2C Interface, Remote Sense, and Stackability WQFNFCRLF16 TPS62873 Buck Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated any any XGL4020-111MEC Coilcraft any TPS62873QWRXSRQ1 Texas Instruments SLVUC13 – 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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