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1 Introduction

This user’s guide contains background information for the TPS54226 as well as support documentation for the 
TPS54226EVM-539 evaluation module. Also included are the performance specifications, schematic, and the bill 
of materials for the TPS54226EVM-539.

1.1 Background

The TPS54226 is a single, adaptive on-time D-CAP2

 mode synchronous buck converter requiring a very 

low external component count. The D-CAP2 control circuit is optimized for low-ESR output capacitors such as 
POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The 
switching frequency is internally set at a nominal 700 kHz. The high-side and low-side switching MOSFETs 
are incorporated inside the TPS54226 package along with the gate drive circuitry. The low drain-to-source 
on resistance of the MOSFETs allow the TPS54226 to achieve high efficiencies and helps keep the junction 
temperature low at high output currents. The TPS54226 also has an auto-skip mode to enable higher efficiency 
at light loads. The TPS54226 DC/DC synchronous converter is designed to provide up to a 2-A output from an 
input control voltage source of 4.5 V to 18 V and an input power voltage source of 2 V to 18 V. The output 
voltage range is from 0.76-V to 5.5-V voltage. The output current range for the evaluation module are given in 

Table 1-1

.

Table 1-1. Input Voltage and Output Current Summary

EVM

INPUT VOLTAGE RANGE

OUTPUT VOLTAGE AND CURRENT 

RANGE

TPS54226EVM-539

VIN = 4.5 V to 18 V

VOUT = 1.05 V, 0 A to 2 A

1.2 Performance Specification Summary

A summary of the TPS54226EVM-539 performance specifications is provided in 

Table 1-2

. Specifications are 

given for an input voltage of VIN = 12V and an output voltage of 1.05V, unless otherwise noted. The ambient 
temperature is 25°C for all measurement, unless otherwise noted.

Table 1-2. TPS54226 EVM and Performance Specifications Summary

SPECIFICATIONS

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input voltage range (VIN)

4.5

12

18

V

CH1

Output voltage

1.05

V

Operating frequency

VIN = 12 V, I

O

 = 1 A

700

kHz

Output current range

0

2

A

Over current limit

VIN = 12 V

3.1

A

Output ripple voltage

VIN = 12 V, I

O

 = 2 A

7

mV

PP

1.3 Modifications

These evaluation modules are designed to provide access to the features of the TPS54226. Some modifications 
can be made to this module.

1.3.1 Output Voltage Set Point

To change the output voltage of the EVMs, change the value of resistor R1. Changing the value of R1 can 
change the output voltage above 0.765 V. The value of R1 for a specific output voltage can be calculated using 

Equation 1

 and 

Equation 2

.

For output voltage from 0.76 V to 2.5 V:

O

R1

V

= 0.765

1+

R2

æ

ö

´ ç

÷

è

ø

(1)

For output voltage over 2.5 V:

Introduction

www.ti.com

2

TPS54226 Step-Down Converter Evaluation Module User's Guide

SLVU336A – NOVEMBER 2009 – REVISED OCTOBER 2021

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Copyright © 2021 Texas Instruments Incorporated

Summary of Contents for TPS54226EVM-539

Page 1: ...ion 5 Figure 2 4 TPS54226EVM 539 Load Transient Response 6 Figure 2 5 TPS54226EVM 539 Output Voltage Ripple 6 Figure 2 6 TPS54226EVM 539 Input Voltage Ripple 7 Figure 2 7 TPS54226EVM 539 Start Up 7 Fi...

Page 2: ...r the evaluation module are given in Table 1 1 Table 1 1 Input Voltage and Output Current Summary EVM INPUT VOLTAGE RANGE OUTPUT VOLTAGE AND CURRENT RANGE TPS54226EVM 539 VIN 4 5 V to 18 V VOUT 1 05 V...

Page 3: ...ical for the evaluation modules and the following Efficiency Output load regulation Output line regulation Load transient response Output voltage ripple Input voltage ripple Start up Switching frequen...

Page 4: ...ke sure the jumper at JP1 Enable control is set from EN to OFF 2 Apply appropriate VIN voltage to VIN and PGND terminals at J1 3 Move the jumper at JP1 Enable control to cover EN and ON The EVM will e...

Page 5: ...gulation The line regulation for the TPS54226EVM 539 is shown Figure 2 3 1 045 1 05 1 055 1 06 1 065 4 8 12 16 20 V Input Voltage V I I 0 001 A O I 1 A O I 2 A O V Output Voltage V O Figure 2 3 TPS542...

Page 6: ...2 4 TPS54226EVM 539 Load Transient Response 2 7 Output Voltage Ripple The TPS54226EVM 539 output voltage ripple is shown in Figure 2 5 The output current is the rated full load of 2 A VOUT 20 mV div A...

Page 7: ...TPS54226EVM 539 Input Voltage Ripple 2 9 Start Up The TPS54226EVM 539 start up waveform is shown in Figure 2 7 EN 10 V div VOUT 500 mV div PG 5 V div Time 500 s div m Figure 2 7 TPS54226EVM 539 Start...

Page 8: ...Voltage V I f Switching Frequency kHz sw V 1 8 V O V 3 3 V O I 1 A O Figure 2 8 TPS54226EVM 539 Switching Frequency Test Setup and Results www ti com 8 TPS54226 Step Down Converter Evaluation Module...

Page 9: ...t connects VIN to VCC and R4 the power good pullup are located on the back side Analog ground and power ground are connected at a single point on the top layer near pin 5 of the TPS54226 The internal...

Page 10: ...re 3 3 Internal Layer 1 Board Layout www ti com 10 TPS54226 Step Down Converter Evaluation Module User s Guide SLVU336A NOVEMBER 2009 REVISED OCTOBER 2021 Submit Document Feedback Copyright 2021 Texas...

Page 11: ...Figure 3 5 Bottom Layer www ti com Board Layout SLVU336A NOVEMBER 2009 REVISED OCTOBER 2021 Submit Document Feedback TPS54226 Step Down Converter Evaluation Module User s Guide 11 Copyright 2021 Texa...

Page 12: ...tom Assembly Board Layout www ti com 12 TPS54226 Step Down Converter Evaluation Module User s Guide SLVU336A NOVEMBER 2009 REVISED OCTOBER 2021 Submit Document Feedback Copyright 2021 Texas Instrument...

Page 13: ...chematic Figure 4 1 is the schematic for the TPS54226EVM Figure 4 1 TPS54226EVM 539 Schematic Diagram www ti com Schematic Bill of Materials and Reference SLVU336A NOVEMBER 2009 REVISED OCTOBER 2021 S...

Page 14: ...Std R5 0 Open Resistor Chip 1 16W 1 0603 Std Std TP1 TP3 TP4 TP6 TP7 TP8 TP9 3 5000 Test Point Red Thru Hole Color Keyed 0 100 0 100 inch 5000 Keystone TP2 TP5 TP9 3 5001 Test Point Black Thru Hole C...

Page 15: ...ther than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control tec...

Page 16: ...These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not in...

Page 17: ...instructions set forth by Radio Law of Japan which includes but is not limited to the instructions below with respect to EVMs which for the avoidance of doubt are stated strictly for convenience and s...

Page 18: ...any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electr...

Page 19: ...R DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthe...

Page 20: ...change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of thes...

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