April 2004

3

M9999-041204

MIC2545A/2549A

Micrel

Pin Description

Pin Number

Pin Number

Pin Name

Pin Function

SOP, DIP

TSSOP

1

1

EN

Enable (Input): Logic-compatible enable input (-1 version is active high, -2

version is active low). High input >1.8V typical; low input <1.4V typical.

Do not float.

MIC2549A only: Also resets thermal shutdown latch.

2

3

FLG

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

thermal shutdown.

MIC2549A only: Latched low on thermal shutdown.

3

5

GND

Ground: Supply return.

4

7

ILIM

Current Limit: Sets current limit threshold using an external resistor (R

connected to ground. 76.8

Ω < R

5, 7

8, 12

IN

Supply Input: Output MOSFET drain. Also powers internal circuitry. Both IN

pins must be externally connected together.

6, 8

10, 14

OUT

Switch Output: Output MOSFET source. Both OUT pins must be externally

connected together.

2,4,6,9,11,13

NC

Not internally connected