US2236090DL-S08-R datasheet(5/5 Pages) UTC

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US2236090D

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 5

www.unisonic.com.tw

QW-R129-028.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 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 1.2V, 1.8V,

2.5V or 3.3V GPIOs.

Input Capacitor (Optional)

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 1.0μF 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 (Optional)

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.

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

US2236090DL-S08-R Datasheet(PDF) 5 Page - Unisonic Technologies