Micrel, Inc.

MIC2090/MIC2091

July 2011

2

M9999-070611-B

Ordering Information

Part Number

Marking

Current

Limit

Current-Limit

Recovery

Junction Temperature

Range

Package

MIC2090-1YM5

L1K

50mA

Auto-Retry

–40

°C to +125°C

SOT-23-5

MIC2091-1YM5

M1K

100mA

Auto-Retry

–40

°C to +125°C

SOT-23-5

MIC2090-2YM5

L2K

50mA

Latch-Off

–40

°C to +125°C

SOT-23-5

MIC2091-2YM5

M2K

100mA

Latch-Off

–40

°C to +125°C

SOT-23-5

Pin Configuration

5-Pin SOT-23 (M5)

Pin Description

Pin Number

Pin Name

Pin Function

1

VIN

Supply (Input): +1.8V to +5.5V. Provides power to the output switch and the MIC2090/MIC2091

internal control circuitry.

2

GND

Ground.

3

EN

Enable (Input): Active-high TTL compatible control input. A high signal turns on the internal

switch and supplies power to the load. This pin cannot be left floating.

4

FAULT/

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:

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

5

VOUT

Switched Output (Output): The voltage on this pin is controlled by the internal switch. Connect

the load driven by the MIC2090/MIC2091 to this pin.