1

Date: 3/31/06 RevG

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

© Copyright 2006 Sipex Corporation

SP6683

The SP6683 is a high power current regulated charge pump ideal for converting a Li-Ion

battery input for driving up to 8 white LED’s used in backlighting color displays. The SP6683

operates with an internal 1.2MHz clock, enabling the use of small external components.

Output current can be accurately regulated by modulating the switcher between the charge

pump and output capacitor. In shutdown mode, the SP6683 discharges the output to ground

and draws less than 500nA current. Offered in 10-pin DFN package, the SP6683 family

includes three options that allow the user to optimize LED driving circuit; SP6683-LV with low

voltage reference, SP6683-03 with high impedance output in shutdown, and SP6683 with

pulled down output in shutdown.

TYPICAL APPLICATION SCHEMATIC

FEATURES

■ Output Current up to 200mA

■ Ideal for White LED driver in CellPhone Flash

■ 0.5µA Shutdown Current

■ 1x/1.5x Mode Charge Pump

■ +2.7V to +5.5V Input Voltage Range

■ Built-in 1.2MHz Oscillator

■ 0.5mA Quiescent Current

■ Over Temperature Protection

■ Shorted LED Protection

■ Programmable Output Current or Voltage

■ PWM Dimming Control via Enable Pin

■ Soft Start to limit In-Rush Current

■ Space Saving 10-pin 3 x 3mm DFN Package

■ Three Options for Optimizing Efficiency:

■ SP6683 - MOSFET discharge in shutdown

■ SP6683-03 - High Impedance in shutdown

APPLICATIONS

■ Mobile Phone

■ Camera Flash Driver

■ PDA

■ Digital Still Camera

■ Digital Camcorder

■ Color LCD Module

1X/1.5X High Efficiency Charge Pump

LED Driver for Flash or Backlight

Now Available in Lead Free Packaging

DESCRIPTION

SP6683

10 Pin DFN

10

9

8

7

6

C2P

C1N

GND

C2N

EN/PWM

1

2

3

4

5

C1P

FB

SP6683

1 Vout

C1P

2

Vin

3

Vmode

4

FB

5

10

C2P

C1N 9

GND

8

C2N

7

EN/PWM 6

EN/PWM

C1

2.2uF

6.3V/0603

C2

1uF

6.3V/0603

C4

6.3V/0603

C3

1uF

6.3V/0603

LED1

Rb

1.5 ohm

1% / 0603

Vin

2.7V~4.2V

Io=Vfb/Rb

2.2uF