Power Configuration Headers - Texas Instruments BoosterPack BOOSTXL-IOLINKM-8 EVM User Manual

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2.2 Power Configuration Headers

The board has three headers used in the power supply configuration shown in
should be applied before power is applied to the board.
1. Header J8 is used to configure the TP26631 eFuse Shutdown (SHDN) pin configuration. Placing the
shunt jumper between the pins labeled "3V3_LP" and "24V_SHDN" disables the 24 V supply rail when
there is no voltage coming from the 3V3_LP (LaunchPad) supply rail. This is the default configuration and
protects the LaunchPad MCU by disabling the BOOSTXL-IOLINKM-8 when the LaunchPad is not properly
powered. Placing the shunt jumper between the pins labeled "24V_SHDN" and "24V_SHDN_PU" connects
the TPS26631 Shutdown (SHDN) pin to the external 24-V supply voltage through a 100 kΩ pullup resistor. In
this configuration, the BOOSTXL-IOLINKM-8 is powered whenever the external 24-V supply is active.
2. Header J9 is connected to the enable pin of the LMR36503 DC-DC stepdown buck converter. Placing a
shunt jumper on this header disables the converter when the 3V3 rail is powered from the LaunchPad
through the 3V3_LP rail or from an external 3.3-V supply.
3. Header J10 is used to configure which 3.3V source is used to supply the 3V3 rail. Placing a shunt jumper
between the pins labeled "3V3_BUCK" and "3V3" connects the output of the LM36503 DC-DC step down
buck converter to the board's 3V3 supply rail. This is the default configuration. Placing a shunt jumper
between the pins labeled "3V3" and 3V3_LP" connects the 3V3_LP supply rail coming from the LaunchPad
to the board 3V3 supply rail.
SLLU357 – MAY 2023
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Figure 2-1. Power Configuration Headers
Copyright © 2023 Texas Instruments Incorporated
Figure 2-1, and the shunt jumpers
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BOOSTXL-IOLINKM-8 EVM User's Guide
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