Datasheet

User's Guide
SLUU393–November 2009
Using the TPS2556EVM-423 and TPS2557EVM-423
This user’s guide describes the TPS2556EVM-423 and TPS2557EVM-423 evaluation modules (EVM).
This guide contains the EVM schematic, list of materials, assembly drawing, and top and bottom board
layouts.
1 Introduction
The TPS2556EVM-423 and TPS2557EVM-423 are evaluation modules (EVM) for Texas Instruments’
power-distribution switches with adjustable current-limit. These EVMs operate over a 2.5-V to 6.5-V range.
An on-board jumper sets the output current-limit to either 0.5 A or 1 A. The board is designed for the 5-A
capability of the TPS2556 or TPS2557. Test points provide convenient access to all critical node voltages.
2 Description
The PCB top-side accepts a power-distribution switch in a SON-8 (DRB) package with a thermal pad.
These switches have an enable input, an over-current status output, and over-temperature shutdown. The
switches operate in current limit mode only.
TPS2556EVM-423 is enabled active lo. TPS2557 is enabled active hi.
2.1 Switches
Table 1. Switches
ENABLE SWITCH POSITION
TPS2556 LO
TPS2557 HI
2
Using the TPS2556EVM-423 and TPS2557EVM-423 SLUU393–November 2009
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