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 sup-

ply against overload. Thermal-overload protection limits

power dissipation and junction temperatures.

The MAX890L’s maximum current limit is 1A. The cur-

rent limit through the switch is programmed with a

resistor from SET to ground. The quiescent supply cur-

rent is a low 10

µA. When the switch is off, the supply

current decreases to 0.1

µA.

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

________________________Applications

PCMCIA Slots

Access Bus Slots

Portable Equipment

____________________________Features

o 2.7V to 5.5V Input Range

o Programmable Current Limit

o Low Quiescent Current

10

0.1

µA (typ) with Switch Off

o Thermal Shutdown

o

FAULT Indicator Output

o 0.09

Ω (typ) On-Resistance

1A, Current-Limited, High-Side

P-Channel Switch with Thermal Shutdown

________________________________________________________________

Maxim Integrated Products

1

1

2

8

7

FAULT

OUT

OUT

SET

IN

IN

ON

GND

MAX890L

SO

TOP VIEW

3

4

6

5

Pin Configuration

MAX890L

1

µF

0.1

µF

100k

Ω

IN

OUTPUT

OUT

INPUT

IN

OUT

FAULT

ON

ON/OFF

GND

SET

Typical Operating Circuit

19-1146; Rev 2; 11/98

PART*

MAX890LC/D

0°C to +70°C

TEMP.

RANGE

PIN-

PACKAGE

Dice**

Ordering Information

*

To order this unit in tape and reel, add (-T) to the end of the part

number.

**

CURRENT

LIMIT

1A

1A

MAX890LESA

-40°C to +85°C

8 SO

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

For small orders, phone 1-800-835-8769.