How to Select Inductor and Output Capacitor for TPS56x25x

Abstract

The TPS56325x, TPS562242, TPS56425x family of devices use D-CAP3™ control mode which provides fast transient response with no external compensation components and an accurate feedback voltage. The TPS56x25x data sheet includes a table recommending LC. This application note introduces how to choose inductor and output capacitor values to accomplish specific design goals, such as transient response, loop stability, or output voltage ripple, based on an application’s needs.

Trademarks

D-CAP3™ and D-CAP2™ are trademarks of Texas Instruments.

Wi-Fi™ is a trademark of Wi-Fi alliance.

All trademarks are the property of their respective owners.

1 Introduction

The TPS56x25x is a simple, easy-to-use, high efficiency, high power density, synchronous buck converter with input voltage ranging from 3 V to 17 V and supports output voltages between 0.6 V and 10 V. TPS56x25x uses small SOT563 package which is 1.6 mm × 1.6 mm and uses HotRod package technology. TPS56x25x has good thermal performance and loop stability. Table 1-1 shows the comparison table for TPS56x25x family parts. These parts can be widely used in Wi-Fi™ access point, switch, router, pro-audio, TV, STB and so on.

Table 1-1 TPS56x25x Family Part Comparison Table

PN	Max load current	Mode	Frequency	Vref
TPS563252	3 A	ECO	1.2 MHz	0.6 V
TPS563257	3 A	FCCM	1.2 MHz	0.6 V
TPS564252	4 A	ECO	600 kHz	0.6 V
TPS564255	4 A	OOA	600 kHz	0.6 V
TPS564257	4 A	FCCM	600 kHz	0.6 V
TPS562242	2 A	ECO	1.4 MHz	0.8 V