3

Date: 3/31/06 RevG

SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight

© Copyright 2006 Sipex Corporation

FUNCTIONAL DIAGRAM

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

Regulated charge pump output.

2

C1P

Positive terminal to the charge pump flying capacitor C2.

Input supply voltage.

a X1 charge pump is used. Otherwise, charge pump switches to X1.5

mode. A voltage divider shown in the typical application circuit

5FB

This is the feedback pin for output current or voltage regulation. The

voltage of this pin is compared with an internal 315mV reference.

6

EN/PWM

Enable and PWM dimming control input. Pull this pin low to discon-

ground in shutdown.

7C2N

Negative terminal to the charge pump flying capacitor, C4.

8

GND

Ground reference.

9C1N

Negative terminal to the charge pump flying capacitor, C2.

10

C2P

Positive terminal to the charge pump flying capacitor C4.

315mV

EN/PWM

1.25V

C2N

Start-up

and

Charge

Pump

Switches

C2P

C1P

FB

Mode Control

GND

C1N

1.2 MHz

Clock

Manager

Voltage

Reference

MODE

COMP

COMP