SP6683
1X/1.5X High Efficiency Charge Pump
LED Driver for Flash or Backlight
FEATURES
VOUT
1
10
C2P
■ Output Current up to 200mA
■ Ideal for White LED driver in CellPhone Flash
■ 0.5µA Shutdown Current
C1P
VIN
9
2
3
4
5
C1N
SP6683
8
7
6
GND
■ 1x/1.5x Mode Charge Pump
10 Pin DFN
■ +2.7V to +5.5V Input Voltage Range
■ Built-in 1.2MHz Oscillator
VMODE
FB
C2N
EN/PWM
■ 0.5mA Quiescent Current
■ Over Temperature Protection
Now Available in Lead Free Packaging
■ 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
■ SP6683-LV - Low Voltage (150mV)VFB 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
2 C1P
10
9
C2P
C1N
C3
1uF
6.3V/0603
SP6683
Io=Vfb/Rb
LED1
GND
3
4
Vin
8
7
C4
2.2uF
6.3V/0603
Vin
2.7V~4.2V
Vmode
C2N
C1
2.2uF
6.3V/0603
5
6
EN/PWM
FB
EN/PWM
Rb
1.5 ohm
1% / 0603
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
© Copyright 2006 Sipex Corporation
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