APPLICATION INFORMATION

ON/OFF Control

Input Capacitor

Output Capacitor

Board Layout

TPS22921, TPS22922, TPS22922B

The ON pin controls the state of the switch. Activating ON continuously holds the switch in the on state so long

as there is no fault. ON is active HI and has a low threshold making it capable of interfacing with low voltage

signals. The ON pin is compatible with standard GPIO logic threshold. It can be used with any microcontroller

with 1.2-V, 1.8-V, 2.5-V or 3.3-V GPIOs.

To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns on into a

the voltage drop during higher current application. When switching a heavy load, it is recommended to have an

input capacitor about 10 or more times higher than the output capacitor in order to avoid any supply drop.

For best performance, all traces should be as short as possible. To be most effective, the input and output

capacitors should be placed close to the device to minimize the effects that parasitic trace inductances may have

electrical effects along with minimizing the case to ambient thermal impedance.

Copyright © 2008, Texas Instruments Incorporated

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Product Folder Link(s): TPS22921 TPS22922 TPS22922B