Texas Instruments TPS22921 User Manual
Size:
174.99 Kb
Download

TPS22921/22/22B Load Switch EVM

User's Guide

Literature Number: SLVU286

January 2009

2

SLVU286–January2009

Submit Documentation Feedback

Contents

1

TPS22921/22/22B Load Switch Evaluation Module (EVM) ................................................

5

1.1

Introduction ...................................................................................................................

5

2

Schematics and Bill of Materials ..................................................................................

7

2.1

EVM Options .................................................................................................................

7

2.2

Schematic.....................................................................................................................

7

2.3

Bill of Materials...............................................................................................................

8

3

Board Layout .............................................................................................................

9

3.1

TPS22921/22/22B EVM Board.............................................................................................

9

3.2

Layout Considerations .....................................................................................................

11

4

EVM Setup ...............................................................................................................

13

4.1

Recommended Test Equipment..........................................................................................

13

4.2

Calculating Voltage Drop and Load Current ............................................................................

13

5

Related Documentation from Texas Instruments ..........................................................

15

Important Notices...............................................................................................................

16

SLVU286–January2009

Contents

3

Submit Documentation Feedback

 

 

www.ti.com

 

List of Figures

 

3-1 TPS22921/22/22B EVM Component Placement ........................................................................

9

3-2 TPS22921/22/22B EVM Top-Side Layout ..............................................................................

10

3-3

TPS22921/22/22B EVM Bottom-Side Layout...........................................................................

10

4-1

EVM Setup For Calculating Voltage Drop and Load Current.........................................................

13

 

List of Tables

 

2-1

TPS22921/22/22B EVM Options ..........................................................................................

7

2.4

Bill of Materials...............................................................................................................

8

4

List of Figures

SLVU286–January2009

Submit Documentation Feedback

Chapter 1

SLVU286–January2009

TPS22921/22/22B Load Switch Evaluation Module (EVM)

This user's guide describes the TPS22921/22/22B evaluation module (EVM). This guide contains the EVM schematics, bill of materials, assembly drawings, and top and bottom board layouts.

1.1Introduction

The TPS22921/22/22B EVM is an evaluation module for the Texas Instruments family of low-inputvoltage,

ultra-lowrON load switches. This EVM operates over a 0.9 V to 3.6 V range and provides a continuous output current of up to110 mA. Additional open resistor and capacitor footprints allow for the use ofcustomer-selectedinput and output load values.

The TPS22921/22/22B EVM accepts a YFP-6packaged load switch for any of three (3) possible devices: TPS22921, TPS22922, or TPS22922B. These switches have a low threshold enable input, internally

controlled slew rate, and ultra-lowquiescent/shutdown current. The TPS22922 and TPS22922B also incorporate a120-Ω quick output discharge resistor internally.

Table 2-1 summarizes the available EVM options.

SLVU286–January2009

TPS22921/22/22B Load Switch Evaluation Module (EVM)

5

Submit Documentation Feedback

 

 

6

TPS22921/22/22B Load Switch Evaluation Module (EVM)

SLVU286–January2009

Submit Documentation Feedback