DESCRIPTION

The A4772 is a low voltage, single N-MOSFET high-side power switch, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. The A4772 equipped with a charge pump circuitry to drive the internal MOSFET switch; the switch's low RDS(ON), 80mΩ, meets USB voltage drop requirements and a flag output is available to indicate fault conditions to the local USB controller.

Additional features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic switch failure from high-current loads, under-voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present. The maximum current is limited to typically 2.1A/1.5A through the switch of A4772A/B, lower quiescent current as 25uA making this device ideal for portable battery-operated equipment.

The A4772 is available in SOT-25 package.

FEATURES

high-

and

applications.

to

low

requirements

fault

inrush

prevent

loads,

the

voltage

typically

lower

for

? Wide Input Voltage Ranges : 2.5V to 5.5V

? Compliant to USB Specifications

? Typical RDS(ON) : 80mΩ

? 1.7V Typical Under-Voltage Lockout (UVLO)

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

? Low Supply Current :

25uA Typical at Switch on State

1uA Typical at Switch off State

? Guaranteed 2.1A/1.5A Continuous Load Current

? Open-Drain Fault Flag Output

? Hot Plug-In Application (Soft-Start)

? Current Limiting Protection

? Thermal Shutdown Protection

? Reverse Current Flow Blocking (no body diode)

? Available in SOT-25 p ackage

APPLICATION

? USB Bus/Self Powered Hubs

? USB Peripherals

? ACPI Power Distribution

? PC Card Hot Swap

? Notebook, Motherboard PCs

? Battery-Powered Equipment

? Hot-Plug Power Supplies

? Battery-Charger Circuits