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MAX891L, MAX892L
Current-Limited, High-Side P-Channel Switches with Thermal Shutdown

Low-Resistance P-Channel Switches with Adjustable, Accurate Current Limit Protects Systems and USB


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Description
FULL DATA SHEET (PDF, 120kB)
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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.

Key Features   Applications/Uses
  • 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-bar Indicator Output
  • On-Resistances:
    • 0.12Ω (MAX891L)
    • 0.25Ω (MAX892L)

 
  • Access Bus Slots
  • PCMCIA Slots
  • Portable Equipment

    Key Specifications:   USB Power Switches
    Part Number Number of Switches Max. Load Current (A) RON (typ) (Ω) Fault Indicator Switch Op. Voltage Range (V) Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX891L  1 0.5 0.12 Yes 2.7 to 5.5 µMAX/8 16 -40 to +85 $1.32 @ 1k
    MAX892L  0.25 0.25 $1.32 @ 1k
    See All USB Power Switches (28)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX891L, MAX892L: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-1223; Rev 0; 1997-06-01
    This page last modified: 2008-07-14


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