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TPS22907YZTR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS22907YZTR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 14 page TPS22907 www.ti.com SLVSA44 – NOVEMBER 2009 APPLICATION INFORMATION On/Off Control 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 high 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. Input Capacitor To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns on into a discharged load capacitor or short-circuit, a capacitor needs to be placed between VIN and GND. A 1-μF ceramic capacitor, CIN, place close to the pins is usually sufficient. Higher values of CIN can be use to further reduce the voltage drop during high-current application. When switching heavy loads, it is recommended to have an input capacitor approximately ten times higher than the output capacitor to avoid excessive voltage drop. Output Capacitor Due to the integral body diode in the PMOS switch, a CIN greater than CL is highly recommended. A CL greater than CIN can cause VOUT to exceed VIN when the system supply is removed. This could result in current flow through the body diode from VOUT to VIN. Board Layout 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 on normal and short-circuit operation. Using wide traces for VIN, VOUT, and GND helps minimize the parasitic electrical effects along with minimizing the case to ambient thermal impedance. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS22907 |
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