MIC2545A/2549A

Micrel

MIC2545A/2549A

2

June 2000

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

Pin Configuration

1

2

3

4

8

7

6

5

OUT

IN

OUT

IN

EN

FLG

GND

ILIM

MIC2545A/2549A

8-Lead SOP (M)

8-Pin DIP (N)

LOGIC,

CHARGE

PUMP

6,8 (OUT)

5,7 (IN)

(EN) 1

(FLG) 2

3 (GND)

(ILIM) 4

MIC2545A/2549A

Ordering Information

Part Number

Enable

Latch*

Temperature Range

Package

MIC2545A-1BM

Active High

–40

°C to +85°C

8-lead SOP

MIC2545A-1BN

Active High

–40

°C to +85°C

8-pin DIP

MIC2545A-1BTS

Active High

–40

°C to +85°C

14-lead TSSOP

MIC2545A-2BM

Active Low

–40

°C to +85°C

8-lead SOP

MIC2545A-2BN

Active Low

–40

°C to +85°C

8-pin DIP

MIC2545A-2BTS

Active Low

–40

°C to +85°C

14-lead TSSOP

MIC2549A-1BM

Active High

•–40

°C to +85°C

8-lead SOP

MIC2549A-1BN

Active High

•–40

°C to +85°C

8-pin DIP

MIC2549A-1BTS

Active High

•–40

°C to +85°C

14-lead TSSOP

MIC2549A-2BM

Active Low

•–40

°C to +85°C

8-lead SOP

MIC2549A-2BN

Active Low

•–40

°C to +85°C

8-pin DIP

MIC2549A-2BTS

Active Low

•–40

°C to +85°C

14-lead TSSOP

2

NC

3

FLG

4

NC

5

GND

6

NC

7

ILIM

1

EN

OUT

14

NC

13

IN

12

NC

11

OUT

10

NC

9

8

IN

MIC2545A/2549A

14-Lead TSSOP (TS)