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Date: 5/5/04

SP6682 High Efficiency Charge Pump Regulator for White LEDs

© Copyright 2004 Sipex Corporation

SP6682

FEATURES

■ Ideal For White LED Driver

■ Low Profile, Inductorless Regulator

■ 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

■ Built-in 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

High Efficiency Charge Pump Regulator

for White LEDs

APPLICATIONS

■ Next Generation Mobile Phones

■ PDAs

■ 3.3V to 5.0V Conversion

■ Digital Still Cameras

■ Digital Camcorders

■ 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 LED used in backlighting color displays. The charge pump automatically switches

between X1.5 and X2 modes based on the input voltage, providing improved efficiency over

traditional methods using charge pump doubler followed by LDO. This input voltage threshold

can be externally programmed for optimized efficiency at specific output voltages and currents.

The SP6682 operates with an internal 600kHz clock, enabling the use of small external

components. 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

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

C3

0.1µF

R2

R1

R3

1M

20

20

20

2.7 - 4.2V

C6

0.1µF

SP6682

10 Pin DFN

10

9

8

7

6

1

2

3

4

5

C2P

C1N

GND

C2N

EN/PWM

V

OUT

C1P

V

IN

V

MODE

FB

Now Available in Lead Free Packaging