MIC9404X Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 28mΩ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF® package

MIC94040/1/2/3
28mΩ R_DSON 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 R_DSON 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 R_DSON
∑ 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 [phone] • fax + 1 [phone] • http://www.micrel.com
May 2008
M9999-053008-A