參數(shù)資料
型號(hào)： TPS22902YFPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA4
封裝： 0.80 X 0.80 MM, 0.40 MM PITCH, 0.50 MM HEIGHT, GREEN, DSBGA-4
文件頁數(shù)： 15/27頁
文件大小： 869K
代理商： TPS22902YFPR
APPLICATION INFORMATION
ON/OFF Control
Input Capacitor
Output Capacitor
Board Layout
SLVS803B – NOVEMBER 2008 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
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.
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-F 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 about 10 times higher than the output capacitor, this in order to avoid excessive voltage drop.
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.
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.
22
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS22901 TPS22902 TPS22902B
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