UNISONIC TECHNOLOGIES CO., LTD

US201/US201A

Preliminary

CMOS IC

www.unisonic.com.tw

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Copyright © 2009 Unisonic Technologies Co., Ltd

QW-R502-302.b

80mΩ, 500mA/1.1A HIGH-SIDE

POWER SWITCHES WITH FLAG

DESCRIPTION

The UTC US201/A series are 80mΩ, 500mA for US201 (1.1A for

US201A) 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.

(under-voltage lockout, 1.7V 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 800mA (UTC US201, single port) and

1.5A (UTC US201A, dual ports).

FEATURES

* 80mΩ(typ) N-Channel MOSFET

* Supply current:

– Switch on :25μA(typ)

– Switch off :1μA (typ)

* Load current 500mA for US201 and 1.1A for US201A

* Input voltage from 2V to 5.5V

* In off-state: Output voltage can be higher than input

Lead-free:

US201L/US201AL

Halogen-free:US201G/US201AG

ORDERING INFORMATION

Ordering Number

Normal

Lead Free

Halogen Free

Package

Packing

US201-AF5-R

US201L-AF5-R

US201G-AF5-R

SOT-25

Tape Reel

US201A-AF5-R

US201AL-AF5-R

US201AG-AF5-R

SOT-25

Tape Reel