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1 Introduction
User's Guide
SLVU189A – February 2007 – Revised December 2007
TPS74701EVM-177 and TPS74801EVM-177
This user's guide describes the characteristics, operation, and use of the TPS74x01EVM-177 evaluation
module (EVM). This EVM contains either the TPS74701 or TPS74801 low-dropout linear regulator IC. This
user's guide includes EVM specifications, recommended test setup, test results, bill of materials (BOM),
and a schematic diagram.
Contents
1 Introduction ................................................................................................................... 1
2 Input/Output Connector Descriptions...................................................................................... 2
3 Board Layout ................................................................................................................. 5
4 Bill of Materials and Schematic ............................................................................................ 7
List of Figures
1 TPS74701 and TPS74801 Start-up in 1 mS with PG ................................................................... 3
2 TPS74701 and TPS74801 Start-up in 10 mS with PG ................................................................. 4
3 Top Assembly Layer ......................................................................................................... 5
4 Top Layer ..................................................................................................................... 5
5 Bottom Layer ................................................................................................................. 6
6 Schematic ..................................................................................................................... 8
List of Tables
1 Typical Performance Specification Summary ............................................................................ 2
5 HPA177 Bill of Materials .................................................................................................... 7
The Texas Instruments TPS74x01EVM-177 evaluation module uses the TPS74701 or TPS74801
low-dropout linear regulator IC. These regulators require a low-power bias voltage, V
BIAS
, and a power
input voltage, V
IN
. These two regulators are capable of providing output voltages down to 0.8 V and have
an integrated supervisory circuit with open-drain output that goes to high impedance when the output
voltage reaches regulation (power good or PG). The TPS74701 and TPS74801 can provide up to 0.5 A
and 1.5 A of output current, respectively, and each has a soft start (SS) pin which allows the user to set
the output voltage's linear ramp rate at startup. The goal of the EVM is to facilitate evaluation of the
TPS74x01 ICs.
SLVU189A – February 2007 – Revised December 2007 TPS74701EVM-177 and TPS74801EVM-177 1
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