MIC2168A

Micrel, Inc.

M9999-062205

2

April 2005

Pin Configuration

FB

GND

6

5

1

VIN

VDD

CS

COMP/EN

10 BST

HSD

VSW

LSD

9

8

7

2

3

4

10-Pin MSOP (MM)

Pin Description

Pin Number

Pin Name

Pin Function

1

VIN

Supply Voltage (Input): 3V to 14.5V.

2

VDD

this regulator operates in dropout mode.

3

CS

Current Sense / Enable (Input): Current-limit comparator noninverting input.

The current limit is sensed across the MOSFET during the ON time. The cur-

rent can be set by the resistor in series with the CS pin.

4

COMP/EN

Compensation (Input): Dual function pin. Pin for external compensation.

If this pin is pulled below 0.2V, with the reference fully up the device shuts

down (50µA typical current draw).

5

FB

Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V.

6

GND

Ground (Return).

7

LSD

Low-Side Drive (Output): High-current driver output for external synchro-

nous MOSFET.

8

VSW

Switch (Return): High-side MOSFET driver return.

9

HSD

High-Side Drive (Output): High-current output-driver for the high-side

10

BST

Boost (Input): Provides the drive voltage for the high-side MOSFET driver.

diode drop.

Pin Number

Pin Name

Pin Function

2

VDD

5V Internal Linear Regulator (Output): V

3

CS

Current Sense / Enable (Input): Current-limit comparator noninverting input.

4

COMP/EN

Compensation (Input): Dual function pin. Pin for external compensation.

5

FB

Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V.

6

GND

Ground (Return).

7

LSD

Low-Side Drive (Output): High-current driver output for external synchro-

8

VSW

Switch (Return): High-side MOSFET driver return.

9

HSD

High-Side Drive (Output): High-current output-driver for the high-side

10

BST

Boost (Input): Provides the drive voltage for the high-side MOSFET driver.

Pin Number

Pin Name

Pin Function

1

VIN

Supply Voltage (Input): 3V to 14.5V.

2

VDD

5V Internal Linear Regulator (Output): V

3

CS

Current Sense / Enable (Input): Current-limit comparator noninverting input.

4

COMP/EN

Compensation (Input): Dual function pin. Pin for external compensation.

5

FB

Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V.

6

GND

Ground (Return).

7

LSD

Low-Side Drive (Output): High-current driver output for external synchro-

8

VSW

Switch (Return): High-side MOSFET driver return.

9

HSD

High-Side Drive (Output): High-current output-driver for the high-side

10

BST

Boost (Input): Provides the drive voltage for the high-side MOSFET driver.

Pin Number

Pin Name

Pin Function

1

VIN

Supply Voltage (Input): 3V to 14.5V.

2

VDD

5V Internal Linear Regulator (Output): V

3

CS

Current Sense / Enable (Input): Current-limit comparator noninverting input.

4

COMP/EN

Compensation (Input): Dual function pin. Pin for external compensation.

5

FB

Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V.

6

GND

Ground (Return).

7

LSD

Low-Side Drive (Output): High-current driver output for external synchro-

8

VSW

Switch (Return): High-side MOSFET driver return.

9

HSD

High-Side Drive (Output): High-current output-driver for the high-side

10

BST

Boost (Input): Provides the drive voltage for the high-side MOSFET driver.

Ordering Information

Part Number

Frequency

Junction Temp. Range

Package

Standard

Pb-Free

MIC2168ABMM

MIC2168AYMM

1MHz

-40°C to +125°C

10-Lead MSOP