MIC94040-1-2-3: 28m - Micrel - #1

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MIC94040/1/2/3 28mÙ RDSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF® package 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 General Description 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 28mÙ 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 softstart turn-on of 100ìs. 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 200Ù 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. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features Ó 28mÙ RDSON Ó 3A continuous operating current Ó 1.2mm x 1.2mm space saving 4-pin MLF® package Ó 1.7V to 5.5V input voltage range Ó Internal level shift for CMOS/TTL control logic Ó Ultra low quiescent current Ó Micro-power shutdown current Ó Soft-Start: MIC94042, MIC94043 Ó Load discharge circuit: MIC94041, MIC94043 Ó Ultra fast turn off time Ó Junction operating temperature from -40ºC to +125ºC Applications Ó Cellular phones Ó Portable Navigation Devices (PND) Ó Personal Media Players (PMP) Ó Ultra Mobile PCs Ó Portable instrumentation Ó Other Portable applications Ó PDAs Ó Industrial and DataComm equipment ________________________________________________________________________________________________________ Typical Application MIC94040 (ultra fast turn on) MIC94042 (soft-start) MIC94041 (ultra fast turn on with auto-dsicharge) MIC94043 (soft-start with auto-discharge)