UNISONIC TECHNOLOGIES CO., LTD

US203

CMOS IC

www.unisonic.com.tw

1 of 7

Copyright © 2018 Unisonic Technologies Co., Ltd

QW-R502-435.K

HIGH-SIDE POWER SWITCHES

WITH FLAG



DESCRIPTION

The UTC US203 are low voltage cost-effective high-side power

switches with flag function. These devices are particularly suitable for

self-powered

and

bus-powered

USB

applications.

The

build-in

is as low as 80mΩ.

The UTC US203 contains a charge pump circuitry to drive the internal

MOSFET switch and also incorporate such protection circuits: soft-start

circuit protect these devices from being damaged by limiting inrush

current during plug-in; thermal shutdown circuit is used to prevent

catastrophic switch failure from high-current loads. UVLO is used to

ensure that the device remains off unless there is a valid input voltage

present.

A flag output is designed to indicate fault conditions to the local USB

controller. lower quiescent current as 25μA making this device ideal for

portable battery-operated equipment.

The UTC US203 are applied in USB Bus/Self powered hubs, USB

peripherals, NB, PCs, PC card hot swap, battery-powered equipment,

hot-plug

power

supplies,

battery-charger

circuits,

ACPI

power

distribution.

SOT-25

1

3

5

2

4

SOP-8

1



FEATURES

* Input Voltage Varies From 3.5V to 5.5V

* Built-in N-MOSFET

* Output Can Be Forced Higher Than Input (Off-State)

* Typical Low Supply Current:

- Switch On: 25μA (TYP)

- Switch Off: 0.1μA (TYP)

* Open-Drain Fault Flag Output To Indicate Fault

Conditions

* Protection Circuits:

- Soft-start( Hot plug-in application)

- UVLO 1.7V (TYP.)

- Current Limiting Protection

- Thermal Shutdown Protection

* Reverse Current Flow Blocking (No Body Diode)



ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

US203XXL-AF5-R

US203XXG-AF5-R

SOT-25

Tape Reel

US203XXL-S08-R

US203XXG-S08-R

SOP-8

Tape Reel