MIC94070/71/72/73: High Side Power Switches - Micrel - #1

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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 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com 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 800ìs (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 2ìA and low shutdown current of <1ìA 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 • 120mÙ RDSON (typical) • Built-in level shift for control logic; can be operated by 1.5V logic. • Low 2ìA quiescent current • Soft-Start: MIC94072/73 • Micro-power shutdown <1ìA • Load discharge circuit: MIC94071, MIC94073 • Space saving 1.2mm × 1.6mm Thin MLF® package 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