Texas Instruments TPS22985EVM, User Manual, Page: 1 / 19

User's Guide
SLVU729 – May 2012
TPS22985EVM
The Texas Instruments TPS22985EVM evaluation module (EVM) helps designers evaluate the operation
and performance of the TPS22985: Supply Selection IC. The TPS22985 selects a 3.3V input from two
available supplies and connects the chosen input to two outputs, OUTA and OUTB. If a 3.3V supply is not
present, the outputs become high impedance. The TPS22985 has two modes of operation, Normal and
Control.
The EVM contains one TPS22985 – Supply Selection IC (See Table 1 ).
Table 1. Device and Package Configurations
CONVERTER IC PACKAGE
U1 TPS22985YFP YFP
Contents
1 Introduction
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2
1.1 Setup
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2
1.2 Power Supply Inputs
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2
1.3 Switch and Jumper Settings
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2
1.4 Powering Up in Normal Mode
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3
1.5 Testing in Normal Mode
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3
1.6 Powering Up in Control Mode
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3
1.7 Testing in Control Mode
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3
1.8 Measuring the Charge Pump
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3
2 Board Layout
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4
3 Schematic and Bill of Materials
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8
3.1 Schematic
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8
3.2 Bill of Materials
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9
List of Figures
1 Top Layer Assembly
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4
2 Top Layer Routing
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5
3 Top Layer Routing
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6
4 Bottom Layer Routing
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7
5 TPS22985EVM Schematic
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8
List of Tables
1 Device and Package Configurations
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1
2 Input Supply Configuration
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2
3 Switch Default Configuration
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2
4 TPS22985EVM Bill of Materials
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9
1 SLVU729 – May 2012 TPS22985EVM
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