MIC2168

Micrel

M9999-111803

2

November 2003

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

5V Internal Linear Regulator (Output): V

drive supply voltage and an internal supply bus for the IC. When V

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

current 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 (50

µA 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

MOSFET. When V

should be used. At V

10

BST

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

The gate-drive voltage is higher than the source voltage by V

diode drop.

Ordering Information

Part Number

Frequency

Junction Temp. Range

Package

MIC2168BMM

1MHz

–40

°C to +125°C

10-lead MSOP