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SP6683
1X/1.5X High Efficiency Charge Pump
LED Driver for Flash or Backlight
FEATURES
■ Output Current up to 200mA
V OUT
1
10 C2P
■ Ideal for White LED driver in CellPhone Flash
■ 0.5 μ A 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
C1P
V IN
V MODE
FB
2
3
4
5
SP6683
10 Pin DFN
9 C1N
8 GND
7 C2N
6 EN/PWM
■ Over Temperature Protection
■ Shorted LED Protection
Now Available in Lead Free Packaging
■ 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
■ SP6683-LV - Low Voltage (150mV)V FB Reference
APPLICATIONS
■ Mobile Phone
■ Camera Flash Driver
■ PDA
■ Digital Still Camera
■ Digital Camcorder
■ Color LCD Module
DESCRIPTION
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
C2
1uF
6.3V/0603
1 Vout
C2P 10
2 C1P
C1N 9
C3
SP6683
1uF
6.3V/0603
Io=Vfb/Rb
3 Vin
GND 8
LED1
Vin
2.7V~4.2V
C1
2.2uF
6.3V/0603
4 Vmode
5 FB
C2N 7
EN/PWM 6
EN/PWM
C4
2.2uF
6.3V/0603
Rb
1.5 ohm
1% / 0603
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
1
? Copyright 2006 Sipex Corporation
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