Micrel, Inc.

MIC2168A

Ordering Information

Part Number

Frequency

Junction Temperature Range

Package

MIC2168AYMM

1MHz

–40° to +125°C

10-Pin MSOP Pb-Free

Pin Configuration

10-Pin MSOP (MM)

(Top View)

Pin Description

Pin Number

Pin Name

Pin Function

1

VIN

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

2

VDD

5V Internal Linear Regulator (Output): VDD is the external MOSFET gate drive supply voltage

and an internal supply bus for the IC. When VIN is <5V, 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

Compensation (Input): Dual function pin. Pin for external compensation. If this pin is pulled below

0.2V, with the reference fully up, the devic

e 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 synchronous 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 VIN is

between 3.0V to 5V, 2.5V threshold-rated MOSFETs should be used. At VIN > 5V, 5V threshold

MOSFETs should be used.

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 VIN minus a diode drop.

April 22, 2015

2

Revision 3.0