®
SP6683
1.5x Charge Pump LED Driver for Parallel Configuration
FEATURES
■ 200mA Output Using 1µF Ceramic Caps
■ Drives up to 8 white LED's
■ 0.5µA Shutdown Current
■ 1x/1.5x Mode Charge Pump
VOUT
C1P
VIN
10
9
1
2
3
4
5
C2P
C1N
SP6683
8
GND
10 Pin DFN
7
VMODE
FB
C2N
■ +2.7V to +5.5V Input Voltage Range
■ Built-in 1.2MHz Oscillator
6
EN/PWM
■ 0.5mA Quiescent Current
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
APPLICATIONS
■ Mobile Phone
■ Camera Flash Driver
■ PDA
■ Digital Still Camera
■ Digital Camcorder
■ SP6683-LV - Low Voltage (150mV)VFB Refer-
ence
■ 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. The SP6683 utilizes 1µF capacitors to deliver up to
200mA current regulated WLED drive capability. 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. The SP6683 is offered in 10-pin DFN package.
TYPICAL APPLICATION SCHEMATIC
C2
®
V
1
2
3
4
5
10
9
1µF
C2P
C1N
GND
C2N
OUT
C1P
SP6683
C4
1µF
8
V
White
LED
IN
7
V
MODE
R1
R2
Lithium-Ion
C5
6
C1
1µF
FB
EN/PWM
1µF
C3
1µF
R5
1M
ENABLE/PWM DIMMING
Date: 08/24/04
SP6683 1.5X Charge Pump LED Driver for Parallel Configuration
© Copyright 2004 Sipex Corporation
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