© 2006 California Micro Devices Corp. All rights reserved.

6

490 N. McCarthy Blvd., Milpitas, CA 95035-5112

l

Tel: 408.263.3214

l

Fax: 408.263.7846

l

www.cmd.com

04/26/06

CM9153

PRELIMINARY

Pin Descriptions

4.5V

LDO

Pre- R egulator

1.5x C harge Pump

OSC

Driver

VIN

ENA

C1P

C 1N

C2P

C 2N

VOUT

GND

1.0uF

1.0uF

1.0uF

1.0uF

3.0V TO 6.0V

CM9153

PIN DESCRIPTIONS

LEAD(s)

NAME

DESCRIPTION

1C2P

This pin is the plus side of charge pump bucket capacitor C2. Connect a 1.0µF

ceramic capacitor between C2N and C2P.

2

VOUT

The regulated 4.5V output voltage pin. This pin requires a 1.0µF or larger ceramic

capacitor to ground. This pin connects to the anodes of the LEDs.

3C1P

This pin is the plus side of charge pump bucket capacitor C1. Connect a 1.0µF

ceramic capacitor with a voltage rating of 10 V or greater between C1N and C1P.

4VIN

Positive supply voltage input pin. This voltage should be between 3.0V and 6V.

This pin requires a 1.0µF or larger ceramic capacitor to ground.

5

ENA

Enable pin, active high. By applying a PWM signal to this pin, the LED brightness

can be controlled.

6C2N

This pin is the minus side of charge pump bucket capacitor C2. Connect a 1.0µF

ceramic capacitor between C2N and C2P.

7GND

Ground pin.

8C1N

This pin is the minus side of charge pump bucket capacitor C1. Connect a 1.0µF

ceramic capacitor between C1N and C1P.

Functional Block Diagram