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1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown

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.

Applications

PCMCIA Slots

Access Bus Slots

Portable Equipment

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

ABSOLUTE MAXIMUM RATINGS

IN to GND ................................................................-0.3V to +6V

ON, FAULT to GND .................................................-0.3V to +6V

SET, OUT to GND ...................................... -0.3V to (VIN + 0.3V)

Maximum Continuous Switch Current ..................................1.5A

Continuous Power Dissipation (TA = +70°C)

SO (derate 5.88mW/°C above +70°C) ..........................471mW

Operating Temperature Range

MAX890LESA ....................................................-40°C to +85°C

Storage Temperature Range ........................... -65°C to +150°C

Lead Temperature (soldering, 10s) . ...............................+300°C

Soldering Temperature (reflow) .......................................+260°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Typical Operating Circuit

Pin Configuration