MIC94064/5
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
January 2008 M9999-011608
General Description
The MIC94064 and MIC94065 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 over 2A of continuous current.
The MIC94064/5 provides a slew rate controlled Soft-Start turn-on of 115ìs (typical) to prevent in-rush current from glitching supply rails.
The MIC94065 features an active load discharge circuit which insures capacitive loads retain no charge when the main
switch is in an OFF state.
An active pull-down on the enable input keeps MIC94064/5 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.
The MIC94064/5’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
• 2A continuous operating current
• 77mÙ (typ) RDSON
• Built-in level shift for control logic; can be operated by 1.5V logic.
• Low 2ìA quiescent current
• Soft-Start: 115ìs
• Micro-power shutdown <1ìA
• Load discharge circuit: MIC94065
• Space saving 1.2x1.6 mm Thin MLF® package
Applications
• Load
switch in portable applications:
- Cellular phones
- PDAs
- MP3 players
- Digital Cameras
- Portable instrumentation
• Battery
switch-over circuits
• Level translator
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Typical Application
MIC94064 Load Switch Application
MIC94065 Load Switch with Capacitive Load Discharge
