US2236060B

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R129-030.b

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APPLICATION INFORMATION

ON/OFF Control

The ON pin controls the state of the switch. Asserting ON high enables the switch. 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 1.2V, 1.8V, 2.5V, or 3.3V GPIOs.

Input Capacitor

To limit the voltage drop on the input supply caused by transient inrush 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

inrush currents during startup; however, a 10 to 1 ratio for capacitance is not required for proper functionality of the

currents.

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

minimizing the case to ambient thermal impedance.