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User's Guide
SLVU602–November 2011
TPS7A3301EVM-061
This User’s Guide describes operational use of the TPS7A3301EVM-061 Evaluation Module (EVM) as a
reference design for engineering demonstration and evaluation of the TPS7A3301, low-dropout
negative-voltage linear regulator (LDO). Included in this user’s guide are setup instructions, a schematic
diagram, layout and thermal guidelines, a bill of materials, and test results.
Contents
1 Introduction .................................................................................................................. 1
2 Setup ......................................................................................................................... 2
2.1 Input/Output Connectors and Jumper Descriptions ........................................................... 2
2.2 Equipment Setup ................................................................................................... 2
3 Operation ..................................................................................................................... 2
4 Adjustable Operation ....................................................................................................... 2
5 Test Results ................................................................................................................. 3
5.1 Turnon Sequence .................................................................................................. 3
5.2 Output Load Transient ............................................................................................. 4
6 Thermal Guidelines and Layout Recommendations ................................................................... 4
7 Board Layout ................................................................................................................ 5
8 Schematic and Bill of Materials ........................................................................................... 7
List of Figures
1 TPS7A3301 LDO Schematic Showing Adjustment Resistors......................................................... 3
2 Turnon Sequence........................................................................................................... 3
3 Load Step and Transient Response...................................................................................... 4
4 Top Layer Silkscreen....................................................................................................... 5
5 Top Layer Routing .......................................................................................................... 6
6 Bottom Layer Routing ...................................................................................................... 7
7 TPS7A3301EVM-061 Schematic ......................................................................................... 7
List of Tables
1 TPS7A3301EVM-061 Bill of Materials ................................................................................... 8
1 Introduction
The Texas Instruments TPS7A3301EVM-061 EVM helps design engineers to evaluate the operation and
performance of the TPS7A33xx family of linear regulators for possible use in their own circuit applications.
This particular EVM is preconfigured to output –15 V and contains a single linear regulator (LDO) with
internal current limit and thermal shutdown protection. The TPS7A33xx family of low-dropout regulators
allows input voltages from –3 V to –36 V and can be adjusted to any output voltage between –1.2 V and
–20 V by only changing a resistor value in accord with the given equation. The regulator, including
external components, is capable of delivering up to 1 A to the load depending on the input-output power
dissipation across the part. The TPS7A33xx has been optimized for ac performance, including PSRR and
load transient response, using capacitors rated over the full voltage range of the regulator. The
TPS7A33xx family is available in a TO220-7 KVT bent-lead package.
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SLVU602–November 2011 TPS7A3301EVM-061
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