_______________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 junc-

tion 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.

________________________Applications

PCMCIA Slots

Access Bus Slots

Portable Equipment

____________________________Features

o Ultra-Small µMAX Package—Only 1.11mm High

o 2.7V to 5.5V Input Range

o Programmable Current Limit

0.1µA Switch Off

o Thermal Shutdown

o

FAULT Indicator Output

o On-Resistances:

0.12

Ω (MAX891L)

0.25

Ω (MAX892L)

Current-Limited, High-Side

P-Channel Switches with Thermal Shutdown

________________________________________________________________

Maxim Integrated Products

1

1

2

8

7

OUT

OUT

FAULT

SET

IN

IN

ON

GND

MAX891L

MAX892L

µMAX

TOP VIEW

3

4

6

5

__________________Pin Configuration

1

µF

0.1

µF

100k

IN

OUTPUT

OUT

INPUT

IN

OUT

FAULT

ON

ON/OFF

GND

SET

MAX891L

MAX892L

__________Typical Operating Circuit

19-1223; Rev 0; 4/97

PART

MAX891LC/D

0°C to +70°C

TEMP.

RANGE

PIN-

PACKAGE

Dice**

______________Ordering Information

* To order these units in tape and reel, add (-T) to the end of the

part number.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

CURRENT

LIMIT

500mA

MAX892LC/D

0°C to +70°C

Dice**

250mA

MAX891LEUA*

-40°C to +85°C

8 µMAX

500mA

MAX892LEUA*

-40°C to +85°C

8 µMAX

250mA