MIC94070/71/72/73

High Side Power Switches

MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

September 2007

M9999-090507

General Description

The MIC94070-73 are high-side load switches designed

for operation between 1.7V to 5.5V. The devices contain

a low on-resistance P-channel MOSFET that supports

1.2A

of

continuous

current.

The

MIC94071

and

MIC94073 feature an active load discharge circuit which

insures capacitive loads retain no charge when the main

switch is in an OFF state.

MIC94070-71 feature rapid turn on while MIC94072-73

provide a slew rate controlled Soft-Start turn-on of 800µs

(typical) to prevent in-rush current from glitching supply

rails.

An

active

pull-down

on

the

enable

input

keeps

MIC94070-73 in a default OFF state until the EN pin is

pulled to a high level. Built-in level shift circuitry allows

low voltage logic signals to switch higher supply

voltages, or vice versa; high level logic signals can

control low level voltages.

MIC94070-73’s operating voltage range makes them

suitable

for

1-cell

Lithium

ion

and

2-

to

3-cell

NiMH/NiCad/Alkaline powered systems, as well as all 5V

applications. Their low operating current of 2µA and low

shutdown current of <1µA maximize battery life.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• 1.7V to 5.5V input voltage range

• 1.2A continuous operating current

• 3A pulse current

• Built-in level shift for control logic; can be operated by

1.5V logic.

• Low 2µA quiescent current

• Soft-Start: MIC94072/73

• Micro-power shutdown <1µA

• Load discharge circuit: MIC94071, MIC94073

• Space saving 1.2mm × 1.6mm Thin MLF

Applications

• Load switch in portable applications:

-

Cellular phones

-

PDAs

-

MP3 players

-

Digital Cameras

-

Portable instrumentation

• Battery switch-over circuits

• Level translator

________________________________________________________________________________________________________

Typical Application

MIC94070, 72

Load Switch Application

MIC94071, 73

Load Switch with Capacitive Load Discharge