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MIC94041

28mΩ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF® package

Micrel 

MIC94040/1/2/3

28mΩ RDSON 3A High Side Load Switch

in 1.2mm x 1.2mm MLF® package

General Description

Features

The MIC94040/1/2/3 is a family of high-side load switches

designed to operate from 1.7V to 5.5V input voltage. The load

switch pass element is an internal 28mΩ RDSON P-channel

MOSFET which enables the device to support up to 3A of

continuous current. Additionally, the load switch supports 1.5V

logic level control and shutdown features in a tiny 1.2mm x

1.2mm 4 pin MLF® package.

The MIC94040 and MIC94041 feature rapid turn on, while the

MIC94042 and MIC94043 provide a slew rate controlled soft-

start turn-on of 100µs. The soft-start feature is provided to

prevent an in-rush current event from pulling down the input

supply voltage.

The MIC94041 and MIC94043 feature an active load

discharge circuit which switches in a 200Ω load when the

switch is disabled to automatically discharge a capacitive load.

An active pull-down on the enable input keeps the

MIC94040/1/2/3 in a default OFF state until the enable pin is

pulled above 1.2V. Internal level shift circuitry allows low

voltage logic signals to switch higher supply voltages. The

enable voltage can be as high as 5.5V and is not limited by

the input voltage.

The MIC94040/1/2/3 operating voltage range makes them

ideal for Lithium ion and NiMH/NiCad/Alkaline battery

powered systems, as well as non-battery powered

applications. The devices provide low quiescent current and

low shutdown current to maximize battery life.

∑ 28mΩ RDSON

∑ 3A continuous operating current

∑ 1.2mm x 1.2mm space saving 4-pin MLF® package

∑ 1.7V to 5.5V input voltage range

∑ Internal level shift for CMOS/TTL control logic

∑ Ultra low quiescent current

∑ Micro-power shutdown current

∑ Soft-Start: MIC94042, MIC94043

∑ Load discharge circuit: MIC94041, MIC94043

∑ Ultra fast turn off time

∑ Junction operating temperature from -40ºC to +125ºC

Applications

∑ Cellular phones

∑ Portable Navigation Devices (PND)

∑ Personal Media Players (PMP)

∑ Ultra Mobile PCs

∑ Portable instrumentation

∑ Other Portable applications

∑ PDAs

∑ Industrial and DataComm equipment

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

________________________________________________________________________________________________________

Typical Application

MIC94040 (ultra fast turn on)

MIC94042 (soft-start)

MIC94041 (ultra fast turn on with auto-dsicharge)

MIC94043 (soft-start with auto-discharge)

MLF and MicroLeadFrame is a registered trademark of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 2008

M9999-053008-A

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