UNISONIC TECHNOLOGIES CO., LTD

US211/A/B/C

CMOS IC

www.unisonic.com.tw

1 of 9

Copyright © 2014 Unisonic Technologies Co., Ltd

QW-R502-A67.C

HIGH-SIDE POWER SWITCHES

WITH FLAG

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DESCRIPTION

The UTC US211/A/B/C series are 80mΩ high-side power

switches. There’s internal single low voltage N-Channel MOSFET

which makes it an ideal for all USB applications. This MOSFET

should be driven by a charge pump circuitry inside. Its switch on

resistance is as low as 80mΩ which we know specially meets the

drop voltage for USB applications.

The flag pin can output an open-drain fault flag to next controller.

There’re lots internal special ways for protecting the chip’s

operation.

When in hot-plug events, there’s large current which can create

the upstream voltage droop to match the USB’s voltage droop

requirements and soft-start for isolating the power source.

As soon as the die temperature is higher than 130

℃, the internal

shutdown circuit will work.

UVLO (under-voltage lockout, 1.3V/2.5V typ.) can make sure the

chip is till in the off state.

Because of the requirement of USB power the fault current

should be ensured less than 0.6A/1.1A (UTC US211/A, single port)

and 1.3A /1.5A (UTC US211B/C, dual ports).

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FEATURES

* 80mΩ(Typ) N-Channel MOSFET

* Supply Current:

–

Switch On : 25μA(Typ)

–

Switch Off : 1μA (Typ)

* Load Current 500mA for US211 and 1.0A for US211A/B/C

* Input Voltage from 2V ~ 5.5V

* In Off-State: Output Voltage can be Higher than Input

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ORDERING INFORMATION

Ordering Number

Package

Packing

US211XXG-AF5-R

SOT-25

Tape Reel