US2236108DBG-S08-R datasheet(4/5 Pages) UTC

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US2236108DB

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R129-031.b



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 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 1.2V, 1.8V,

2.5V or 3.3V 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 about 10 times higher than the output capacitor, this in order 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.

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