Micrel, Inc.

MIC2544/2548

April 2010

3

M9999-043010

Pin Configuration

8-pin SOIC (M)

8-Pin MSOP (MM)

Note: Pins 4 and 5 for SOIC and MSOP are different.

Pin Description

Pin Number

MSOP-8

Pin Number

SOIC-9

Pin Name

Pin Function

1

1

EN

Enable (Input): Logic-compatible enable input. Active-high (-1) or active-

low (-2). High input >1.7V typical; low input <1.5V typical. Do not float.

MIC2548 only: Also resets thermal shutdown latch.

2

2

FLG

Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent

or thermal shutdown conditions. MIC2548 only: latched low on thermal

shutdown.

3

3

GND

Ground.

5

4

ILIM

1

connected to ground. 154

7

7

IN

Input: Output MOSFET drain. Also powers internal circuitry.

6,8

6,8

OUT

Switch (Output): Output MOSFET source. Pins 6 and 8 must be externally

connected.

4

5

NC

Not internally connected.