1

Date: 7/1

9/06 Rev D

SP6682 High Efficiency Charge Pump Regulator for White LEDs

© 2006 Sipex Corporation

FEATURES

■

Ideal For White LED Driver

■

Low Profile, Inductorless Regulator

■

Output Current up to 200mA

■

X1.5 and X2 Modes for Highest Efficiency

■

+2.7V to +5.5V Input Voltage Range

■

Fast Turn-On Time, 175µS

■

1mA Quiescent Current

■

<1.5µA Shutdown Current

■

600kHz Oscillator

■

Programmable Output Current or Voltage

■

PWM Dimming Control with Enable Pin

■

Shutdown to Disconnect Output from Input

■

Soft Start to Eliminate In-Rush Current

■

Industry Standard 10-pin MSOP Package

and Small 10-pin DFN Package

APPLICATIONS

■

Next Generation Mobile Phones

■

PDAs

■

3.3V to 5.0V Conversion

■

Palmtop Computers

■

Color LCD Modules

DESCRIPTION

The SP6682 is a current regulated charge pump ideal for converting a Li-Ion battery input for

driving white LEDs used in backlighting color displays or cell phone camera flash applications.

The charge pump automatically switches between X1.5 and X2 modes based on the program-

doublerfollowedbyLDO. Thisinputvoltagethresholdcanbeexternallyprogrammedbyaresistor

divider network for optimized efficiency at specific output voltages and currents. The SP6682

operates with an internal 600kHz clock, which reduces switching noise and improves V

Output current or voltage can be accurately regulated by modulating the switcher between the

charge pump and output capacitor. In shutdown mode, the IC disconnects the output from the

input and draws less than 1.5µA current. The SP6682 is offered in a 10-pin MSOP package, and

a small 10-Pin DFN Package.

TYPICAL APPLICATION SCHEMATIC

Now Available in Lead Free Packaging

SP6682

10 Pin DFN

10

9

8

7

6

1

2

3

4

5

C2P

C1N

GND

C2N

EN/PWM

VOUT

C1P

VIN

VMODE

FB

LCD BACKLIGHT

APPLICATION

SP6682

C1P

FB

®

C2P

C1N

GND

C2N

EN/PWM

1

2

3

4

5

10

9

8

7

6

C2

2.2µF

C4

2.2µF C5

2.2µF

R6

20

C1

2.2µF

Lithium-Ion

ENABLE/PWM DIMMING

White

LED

R3

1M

20

20

20

2.7 - 4.2V

C6

0.1µF

SP6682

High Efficiency Charge Pump

Regulator for White LEDs