Micrel, Inc.

MIC3230/1/2

November 2009

3

M9999-113009-B

Pin Configuration

IADJ

IS

6

5

1

VIN

EN

PWMD

COMP

10 VDD

DRV

PGND

OVP

9

8

7

2

3

4

IADJ

IS

VIN

EN

PWMD

COMP

1

VDD

DRV

PGND

OVP

2

3

4

5

FS

EPAD

SYNC/NC

6

8

12

11

10

9

7

1

N/C

VIN

EN

PWMD

COMP

IADJ

FS

AGND

16 N/C

VDD

DRV

PGND

OVP

IS

SYNC/NC

N/C

15

14

13

12

11

10

9

2

3

4

5

6

7

8

EPAD

10-Pin MSOP (MM)

MIC3232

12-Pin 3mmx3mmMLF

MIC3230, MIC3231

See Product Option Matrix for selection

16-Pin TSSOP (TSE)

MIC3230, MIC3231

See Product Option Matrix for selection

Pin Description

Pin Number

MLF

®

Pin Number

TSSOP

Pin Number

MSOP

Pin Name

Pin Function

--

1

--

NC

No Connect.

1

2

1

VIN

Input Voltage (power) 6V to 45V.

2

3

2

EN

Enable Control (Input). Logic High (≥1.5V) enables the

regulator. Logic Low (≤0.4V) shuts down the regulator.

Connect a 100kΩ resistor from EN to VIN.

3

4

3

PWMD

PWM input. High signal terminates the output power. Low

Signal starts up the output power.

4

5

4

COMP

Compensation (output): for external compensation.

5

6

5

IADJ

Feedback (input).

6

7

--

FS

Frequency Select (input). Connected to a Resistor to

determine the operating frequency.

--

8

--

AGND

Analog Ground.

--

9

--

NC

No Connect.

7

10

--

SYNC

Sync (output). Connect to another MIC3230 to synchronize

multiple converters.

8

11

6

IS

Current Sense (input). Connected to external current sense

resistor which in turn is connected to the source of the external

FET as well as an external slope compensation resistor.

9

12

7

OVP

OVP divider connection (output). Connect the top of the

divider string to the output. If the load is disconnected, the

output voltage will rise until OVP reaches 1.25V and then will

regulate around this point.

10

13

8

PGND

Power Ground.

11

14

9

DRV

Drive Output: connect to the gate of external FET (output).

12

15

10

VDD

VDD Filter for internal power rail. Do not connect an external

load to this pin. Connect 10µF to GND.

--

16

--

NC

No Connect.

--

--

--

EPAD

Connect to AGND.