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

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requirements

fault

inrush

prevent

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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