MIC2090_11 Datasheet, PDF (1/23 Pages) Micrel Semiconductor – Current Limiting Power Distribution Switches

MIC2090/MIC2091
Current Limiting Power
Distribution Switches
General Description
Features
The MIC2090 and MIC2091 are high-side MOSFET power
switches optimized for general-purpose 50mA or 100mA
low power distribution in circuits requiring over-current
limiting and circuit protection. Typical applications for these
parts are for switching power in USB ports, portable
consumer items, camera and camcorder motor protection,
thermal printer head protection, and many other low
current-load switching applications.
The MIC2090 and MIC2091 come in two versions: auto-
retry current limit and output latch off on an over current
fault. The MIC2090 and MIC2091 are offered in a space
saving 5-pin SOT-23 package with an operating junction
temperature range of -40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• 1.8V to 5.5V supply voltage
• 790 mΩ typical R_DSON at 3.3V
• MIC2090 is rated for 50mA minimum continuous current
• MIC2091 is rated for 100mA minimum continuous
current
• Reverse current blocking (OGI)
• 20ns super fast reaction time to hard short at output
• 10ms fault flag delay (t_{D_FAULT/}) eliminates false
assertions
• Auto-retry overcurrent and short-circuit protection (-1
version)
• Latch-off on current limit (-2 version)
• Thermal shutdown
• Fault status flag indicates: over-current, over-
temperature, or UVLO
• Under-voltage lockout (UVLO)
• Low quiescent current
Applications
• USB peripherals
• Camcorder
• DSC
• MP3/iPod
• SD protection
• USB low-power hub
_________________________________________________________________________________________________________________________
Typical Application
MIC2091 USB Power Switch
Startup into Short Circuit
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2011
M9999-070611-B