Micrel, Inc.

MIC4827

July 2009

2

M9999-070709-A

(408) 955-1690

Ordering Information

Part Number

Standard

Pb-Free

Ambient Temp. Range

Package

MIC4827BMM

MIC4827YMM

–40° to +85°C

8-Pin MSOP

Pin Configuration

8-Pin MSOP (MM)

Pin Description

Pin Number

Pin Name

Pin Function

1

VDD

Supply (Input): 1.8V to 5.5V.

2

RSW

Switcher Resistor (External Component): Set switch frequency of the internal

power MOSFET by connecting an external resistor to VDD. Connecting the

external resistor to GND disables the switch oscillator and shuts down the

device.

3

REL

EL Resistor (External Component): Set EL frequency of the internal H-bridge

driver by connecting an external resistor to VDD. Connecting the external

resistor to GND disables the EL oscillator.

4

GND

Ground Return.

5

SW

Switch Node (Input): Internal high-voltage power MOSFET drain.

6

CS

Regulated Boost Output (External Component): Connect the output capacitor of

the boost regulator and connect to the cathode of the diode.

7

VB

EL Output: Connect to one end of the EL lamp. Polarity is not important.

8

VA

EL Output: Connect to the other end of the EL lamp. Polarity is not important.