General Description

The MAX890L smart, low-voltage, P-channel, MOSFET power switch is intended for high-side load-switching applications. This switch operates with inputs from +2.7V to +5.5V, making it ideal for both +3V and +5V systems. Internal current-limiting circuitry protects the input supply against overload. Thermal-overload protection limits power dissipation and junction temperatures.

The MAX890L’s maximum current limit is 1.2A. The current limit through the switch is programmed with a resistor from SET to ground. The quiescent supply current is a low 10µA. When the switch is off, the supply current decreases to 0.1µA.

The MAX890L is available in an 8-pin SO package.

Features

♦ +2.7V to +5.5V Input Range

♦ Programmable Current Limit

♦ Low Quiescent Current

   10µA (typ) at VIN = +3.3V

   0.1µA (typ) with Switch Off

♦ Thermal Shutdown

♦ FAULT Indicator Output

♦ 0.09Ω (typ) On-Resistance

Applications

  PCMCIA Slots

  Access Bus Slots

  Portable Equipment