MIC2090/MIC2091
Current Limiting Power
Distribution Switches
General Description Features
The MIC2090 and MIC2091 are high-side MOSFET power
1.8V to 5.5V supply voltage
switches optimized for general-purpose 50mA or 100mA
790 m typical R at 3.3V
DSON
low power distribution in circuits requiring over-current
MIC2090 is rated for 50mA minimum continuous current
limiting and circuit protection. Typical applications for these
MIC2091 is rated for 100mA minimum continuous
parts are for switching power in USB ports, portable
current
consumer items, camera and camcorder motor protection,
thermal printer head protection, and many other low Reverse current blocking (OGI)
current-load switching applications.
20ns super fast reaction time to hard short at output
10ms fault flag delay (t ) eliminates false
D_FAULT/
The MIC2090 and MIC2091 come in two versions: auto- assertions
retry current limit and output latch off on an over current
Auto-retry overcurrent and short-circuit protection (-1
fault. The MIC2090 and MIC2091 are offered in a space
version)
saving 5-pin SOT-23 package with an operating junction
Latch-off on current limit (-2 version)
temperature range of -40 C to +125 C.
Thermal shutdown
Fault status flag indicates: over-current, over-
Data sheets and support documentation can be found on
temperature, or UVLO
Micrels web site at: www.micrel.com.
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 +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2090/MIC2091
Ordering Information
Current Current-Limit Junction Temperature
Part Number Marking Package
Limit Recovery Range
MIC2090-1YM5 L1K 50mA Auto-Retry 40C to +125 C SOT-23-5
MIC2091-1YM5 M1K 100mA Auto-Retry 40C to +125 C SOT-23-5
MIC2090-2YM5 L2K 50mA Latch-Off 40C to +125 C SOT-23-5
MIC2091-2YM5 M2K 100mA Latch-Off 40C to +125 C SOT-23-5
Pin Configuration
5-Pin SOT-23 (M5)
Pin Description
Pin Number Pin Name Pin Function
Supply (Input): +1.8V to +5.5V. Provides power to the output switch and the MIC2090/MIC2091
1 VIN
internal control circuitry.
2 GND Ground.
Enable (Input): Active-high TTL compatible control input. A high signal turns on the internal
3 EN
switch and supplies power to the load. This pin cannot be left floating.
Fault Status (Output): Open drain output. Can be connected to other open drain outputs. Must
be pulled high with an external resistor.
When EN=0, FAULT/ pin is high
When EN=1, a low on the FAULT/ pin indicates one or more of the following conditions:
4 FAULT/
1. The part is in current limit and is turned off.
2. The part is in thermal limit and is turned off.
3. The part is in UVLO
Switched Output (Output): The voltage on this pin is controlled by the internal switch. Connect
5 VOUT
the load driven by the MIC2090/MIC2091 to this pin.
M9999-070611-B
July 2011 2