UNISONIC TECHNOLOGIES CO., LTD

US3X77

CMOS IC

www.unisonic.com.tw

1 of 10

Copyright © 2011 Unisonic Technologies Co., Ltd

QW-R502-568.B

POWER DISTRIBUTION SWITCH

DESCRIPTION

The UTC US3X77 is a power distribution switch and particularly

designed for self-powered and bus-powered Universal Serial Bus

(USB) applications.

The UTC US3X77 incorporates protection circuits including

current limiting circuit with foldback function, thermal shutdown circuit

designed to prevent catastrophic switch failure due to increasing

power dissipation when continuous heavy loads or short circuit

occurs. Besides, a built-in charge pump is used to drive the

N-channel MOSFET that is free of parasitic body diode to eliminate

any reversed current flow across the switch when it is powered off.

open-drain output report over-current or over-temperature event

which has deglitch typical 9ms timeout period typically 9ms.

The UTC US3X77 is applied in high-side power protection

switch, USB power management, USB host and self-powered bubs,

USB bus-powered hubs, hot plug-in power supplies, battery-charger

circuits.

FEATURES

* 100mΩ High-Side MOSFET

* Supply Current:

Switch on : 65μA(Typ)

Switch off : 1μA (Max)

* Accurate Current Limit with Foldback

* Deglitched Open-Drain Over-Current Flag Output (OC)

* No Reverse Current when Power Off

* Under voltage Lockout

* Operating Range:2.7V ~ 5.5V

* Output Shutdown Pull-low Resistor

ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

US3X77XL-S08-R

US3X77XG-S08-R

SOP-8

Tape Reel

US3X77XL-S08-T

US3X77XG-S08-T

SOP-8

Tube

US3X77XL-SM1-R

US3X77XG-SM1-R

MSOP-8

Tape Reel

US3X77XL-SM1-T

US3X77XG-SM1-T

MSOP-8

Tube