SP6682 datasheet(3/12 Pages) SIPEX

3 / 12 page

Date: 5/5/04

SP6682 High Efficiency Charge Pump Regulator for White LEDs

VOUT

306m

EN/PW

1.25V

C2N

Start-up

and

Charge

Pump

Switches

VMODE

C2P

C1P

Mode Control

GND

VIN

C1N

600 kHz

Clock

Manager

Voltage

Referenc

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 pin for the 2.7V to 5.5V supply voltage.

4VMODE

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

X1.5 charge pump is used. Otherwise, charge pump switches to X2

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 SP6682.

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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