Micrel

MIC2159

October 2006

2

M9999-101206

Ordering Information

Part Number

Output Voltage

Frequency

Juction Temperature

Range

Package

MIC2159YMME

Adj

400KHz

-40

°C to +125°C

10-lead ePAD MSOP

Pin Configuration

10-lead e-PAD MSOP (MME)

Pin Description

Pin Number

(MSOP-10)

Pin Name

Pin Function

1

Supply voltage (Input): 3V to 14.5V

2

3

CS

Current Sense. Current-limit comparator non-inverting input. The current limit is sensed across

the FET 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 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 below 5v, 2.5v threshold FETs should be used. At Vin > 5V, 4.5V threshold FETs

should be used.

10

BST

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