US202ALG-AF5-R datasheet(5/5 Pages) UTC

5 / 5 page

US202/A

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 5

www.unisonic.com.tw

QW-R502-445.F



APPLICATION INFORMATION (Cont.)

Reverse Current Preventing

Since the UTC US202/A’s MOSFET is bi-directional, it allows the voltage on VOUT pin is higher than that on VIN

pin. In order to avoid reverse current occur, turn off this switch or connect VIN to a fixed voltage less than 1.2V.

Layout and Thermal Dissipation

The switch should be placed as close to the USB connector as possible and all traces should be as short as

possible to reduce the effect of undesirable parasitic inductance.

Also, place the output capacitor and ferrite beads to the USB connector as close to as possible.

If ferrite beads are used, use wires kept to a minimum resistance and large solder pads to minimize connection

resistance.

If the package is with dual VOUT or VIN pins, short both the same function pins as Fig.1 or Fig.2 to reduce the

internal turn-on resistance. If the output power is delivered to two individual ports, it is specially necessary to short

both VOUT pin at the switch output side in order to protect the switch when each port are plug-in separately.

Under normal operating conditions, the package can dissipate the channel heat away. Wide power bus planes

connected to VIN and VOUT and a ground plane in contact with the device will help dissipate additional heat.



TYPICAL APPLICATION CIRCUIT

GND

CIN

1µF

COUT (Note)

470µF

VOUT

VIN

VOUT

Note: 470µF, Low ESR Electrolytic

VIN

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. UTC reserves the right to

make changes to information published in this document, including without limitation specifications and

product descriptions, at any time and without notice. This document supersedes and replaces all

information supplied prior to the publication hereof.

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