22uF

3.3V / 0.5A

10uF

2.2µH

VIN

TPS62170-Q1

470k

150k

VIN

EN

AGND

PGND

SW

VOS

PG

FB

100k

Copyright © 2016, Texas Instruments Incorporated

11

TPS62170-Q1, TPS62171-Q1, TPS62172-Q1

www.ti.com

SLVSCK7A – DECEMBER 2014 – REVISED SEPTEMBER 2016

Product Folder Links: TPS62170-Q1 TPS62171-Q1 TPS62172-Q1

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(1)

See Third-Party Products disclaimer.

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The following information is intended to be a guideline through the individual power supply design process.

8.2 Typical TPS62170-Q1 Application

space

Figure 5. 3.3-V/0.5-A Power Supply

8.2.1 Design Requirements

The step-down converter design can be adapted to different output voltage and load current needs by choosing

external components appropriate. The following design procedure is adequate for whole VIN, VOUT and load

current range of TPS62170-Q1. Using Table 2, the design procedure needs minimum effort.

Table 1. List of Components

REFERENCE

DESCRIPTION

IC

17-V, 0.5-A step-down converter, WSON

TPS62170QDSG, Texas Instruments

L1

2.2-µH, 1.4-A, 3 x 2.8 x 1.2 mm

VLF3012ST-2R2M1R4, TDK

CIN

10-µF, 25-V, ceramic

Standard

COUT

22-µF, 6.3-V, ceramic

Standard

R1

Depending on Vout

R2

Depending on Vout

R3

100-kΩ, chip, 0603, 1/16-W, 1%

Standard