General Description
The MAX891L/MAX892L smart, low-voltage, P-channel, MOSFET power switches are intended for high-side load-switching applications. These switches operate with inputs from 2.7V to 5.5V, making them 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 MAX891L/MAX892L’s maximum current limits are 500mA and 250mA, respectively. The current limit through the switch is programmed with a resistor from SET to ground. When the switch is on, the quiescent supply current is a low 13µA. When the switch is off, the quiescent current decreases to 0.1µA.
The MAX891L/MAX892L are available in 8-pin µMAX packages.

FEATUREs
♦ Ultra-Small µMAX Package—Only 1.11mm High
♦ 2.7V to 5.5V Input Range
♦ Programmable Current Limit
♦ Low 13µA Quiescent Current at VIN = 3.3V, 0.1µA Switch Off
♦ Thermal Shutdown
♦ FAULT Indicator Output
♦ On-Resistances:
   0.12Ω (MAX891L)
   0.25Ω (MAX892L)
  
Applications
  PCMCIA Slots
  Access Bus Slots
  Portable Equipment