UNISONIC TECHNOLOGIES CO., LTD

US203

Preliminary

CMOS IC

www.unisonic.com.tw

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Copyright © 2011 Unisonic Technologies Co., Ltd

QW-R502-435.d

80mΩ, 0.6/1.5A 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

meets the requirements of USB voltage drop 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. Fault current is limited to typically 2.5A for UTC US203AH/AL in

dual ports and 1A for UTC US203CH/CL in single port in accordance with the

USB power requirements, 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.

FEATURES

* Input Voltage Varies From 2.5V 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: 1μA (TYP)

* Guaranteed Continuous Load Current: 1.5A for US203AH/AL and 0.6A for

* 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)

SOT-25

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3

5

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SOP-8

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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