Description

    The AT6280 Smart Switch is a current limited P-channel MOSFET power switch designed for high-side load switching applications. This switch operates with inputs ranging from 2.4V to 5.5V, making it ideal for both 3Vand 5V systems. An integrated current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. The AT6280 is also protected from thermal overload which limits power dissipation and junction temperatures. It can be used to control loads that require up to 1A. Current limit threshold is programmed with a resistor from ISET to ground. The quiescent supply current is typically a low 25μA. In shutdown mode, the supply current decreases to less than 1μA..

    The AT6280 develops ultra-low Rds(on) switch with programmable current limiting to protect the power source from over current and short circuit conditions. It integrates the over temperature protection and discharges the output capacitor during the shutdown. In case the output is pulled higher than the input voltage under the shutdown, the AT6280 can block the current flowing from the output to the input. 

     The AT6280 is available in a Pb-free 5-pin SOT23 package and is specified over the -40°C to +85°C temperature range.

Features

• Distribution voltages: 2.4V to 5.5V

• Programmable current limit

• 80mΩ Typical RDS(ON)

• Over temperature shutdown and automatic retry

• Reverse blocking (no body diode)

• At shutdown, OUT can be forced higher than IN

• Automatic output discharge at shutdown

• Compact SOT23-5L packages minimize the board space.

Applications

• USB 3G Datacard

• USB Dongle

• MiniPCI Accessories

• Hot Swap Supplies

• Notebook Computers

• Peripheral Ports

• Personal Communication Devices

Typical Applications Circuit