FEATURES

Continuous Load Current

2.1A Continuous Load Current

 52mΩ High-side P-channel MOSFET Switch

 Active High

 Operating Range: 2.7 V to 5.5 V

 1.2ms Typical soft start time

 3μA Shutdown Supply Current (typ.)

 Fast Over-current Response 2μs (typ.)

 Under Voltage Lockout

 No Reverse Current when Power Off

 Output Reverse-voltage Protection

 Deglitched Open-drain Over-current Flag Output

 Enable Logic: Active-high

 Output Build-in 250Ω Discharge Tube (Optional

According to Version)

DESCRIPTION

The A4771A is cost-effective, built-in 52m power switch IC for self-powered and bus-powered Universal Serial Bus (USB) applications.

The A4771A is include current limit and thermal shutdown to prevent catastrophic switch failure caused by increasing power dissipation when continuous heavy load or short circuit occur.

The A4771 built-in 52m P-channel MOSFET with true shutdown function to eliminate any reversed current flowing across the switch when the device is powered off. When the output voltage is higher than input voltage, the power switch will be turned off by the internal output reverse-voltage comparator.

FLG is an open-drain output, which reports over-current has a typical 8ms deglitch timeout period. In addition, FLG also has typical 8ms deglitch timeout period.

The A4771A is available in SOT-25 packages.

APPLICATION

 Notebook PCs

 High-Side Power Protection Switch

 USB Host and Self-Powered Hubs

 USB Bus-Powered Hubs

 Set Top Box

 Smart TV

 MID and Notebook Computer