Texas Instruments TPS22921, TPS22922, TPS22922B User Manual
TPS22921/22/22B Load Switch EVM
User's Guide
Literature Number: SLVU286
January 2009
2 SLVU286 – January 2009
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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 – January 2009 Contents 3
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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 – January 2009
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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.
1.1 Introduction
The TPS22921/22/22B EVM is an evaluation module for the Texas Instruments family of low-input voltage,
ultra-low r
output current of up to ≈ 110 mA. Additional open resistor and capacitor footprints allow for the use of
customer-selected input and output load values.
The TPS22921/22/22B EVM accepts a YFP-6 packaged 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-low quiescent/shutdown current. The TPS22922 and TPS22922B also
incorporate a 120- Ω quick output discharge resistor internally.
Table 2-1 summarizes the available EVM options.
load switches. This EVM operates over a 0.9 V to 3.6 V range and provides a continuous
ON
Chapter 1
SLVU286 – January 2009
SLVU286 – January 2009 TPS22921/22/22B Load Switch Evaluation Module (EVM) 5
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TPS22921/22/22B Load Switch Evaluation Module (EVM)6 SLVU286 – January 2009
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