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User's Guide
SLVU409–October 2010
TPS61251 Evaluation Module
This user's guide describes the characteristics, operation, and use of the TPS61251 evaluation module
(EVM). This EVM contains the Texas Instruments 3.25 MHz, up to 6.5 V, step-up DC-DC converter
TPS61251 with an adjustable input current limit. The user's guide includes EVM specifications,
recommended test setup, the schematic diagram, bill of materials, the board layout, and test data.
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CAUTION
Please be aware that the input current is limited to 500 mA on this EVM. For
maximum output current operation remove R3 and connect ILIM to VIN.
Contents
1 Introduction .................................................................................................................. 2
1.1 Requirements ....................................................................................................... 2
1.2 Applications ......................................................................................................... 2
1.3 Features ............................................................................................................. 2
2 TPS61251 EVM Electrical Performance Specifications ................................................................ 3
3 TPS61251 EVM Schematic ................................................................................................ 3
4 Connector and Test Point Descriptions .................................................................................. 4
4.1 Input Connectors ................................................................................................... 4
4.2 Output Connectors ................................................................................................. 4
4.3 Other Connectors .................................................................................................. 4
4.4 Jumpers ............................................................................................................. 4
5 TPS61251 EVM Test Data ................................................................................................ 5
5.1 Efficiency ............................................................................................................ 5
5.2 Load and Line Regulation ......................................................................................... 5
5.3 Output Voltage Ripple ............................................................................................. 6
5.4 Startup ............................................................................................................... 8
6 TPS61251 EVM Assembly Drawings and Layout ...................................................................... 9
7 List of Materials ............................................................................................................ 10
List of Figures
1 TPS61251 EVM Schematic................................................................................................ 3
2 TPS61251 EVM Efficiency vs Load Current............................................................................. 5
3 TPS61251 EVM Load Transient Response, Snooze Mode to PFM Mode.......................................... 5
4 TPS61251 EVM Load Transient Response, PFM Mode .............................................................. 5
5 TPS61251 EVM Load Transient Response, PFM Mode to CCM Mode............................................. 5
6 TPS61251 EVM Load Transient Response, CCM Mode.............................................................. 5
7 TPS61251 EVM Line Transient Response .............................................................................. 6
8 TPS61251 EVM Output Voltage Ripple in Snooze Mode ............................................................. 6
9 TPS61251 EVM Output Voltage Ripple in PFM Mode................................................................. 6
10 TPS61251 EVM Output Voltage Ripple at 150mA ..................................................................... 6
11 TPS61251 EVM Output Voltage Ripple at Full Load................................................................... 7
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SLVU409–October 2010 TPS61251 Evaluation Module
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