SP6683 datasheet(3/10 Pages) SIPEX

3 / 10 page

Date: 07/07/04

SP6683 White LEDs Driver for Parallel Configuration

VOUT

306mV

EN/PWM

1.25V

C2N

Start-up

and

Charge

Pump

Switches

VMODE

C2P

C1P

Mode Control

GND

VIN

C1N

1.2 MHz

Clock

Manager

Voltage

Reference

MODE

COMP

VOUT

COMP

FUNCTIONAL DIAGRAM

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

1VOUT

Regulated charge pump output.

C1P

Positive terminal to the charge pump flying capacitor C2.

3VIN

Input supply voltage.

4VMODE

Charge pump mode program pin. When VMODE is greater than 1.25V,

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

mode. A voltage divider shown in typical application circuit programs

the VIN threshold for charge pump mode switching.

5FB

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

voltage of this pin is compared with an internal 306mV reference.

EN/PWM

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

nect VOUT from VIN and shutdown the SP6683.VOUT is pulled to

ground in shutdown.

C2N

Negative terminal to the charge pump flying capacitor, C4.

GND

Ground reference.

C1N

Negative terminal to the charge pump flying capacitor, C2.

C2P

Positive terminal to the charge pump flying capacitor C4.

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