US202

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 6

www.unisonic.com.tw

QW-R502-445.c

APPLICATION INFORMATION (Cont.)

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.

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

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

TYPICAL APPLICATION CIRCUIT

GND

1µF

470µF

CE

Note: 470µF, Low ESR Electrolytic

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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.