®
Preliminary
SP6685
Charge Pump LED Driver For Camera Flash
FEATURES
■ High Output Current Charge Pump: 700mA
■ Adjustable FLASH mode
V
10
9
1
2
3
4
5
V
P
S
IN
OUT
GND
GND
C1
C2
SP6685
■ x1 and x2 Automatic Modes for High Efficiency
■ Minimum External Components: No Inductors
■ High Frequency Operation: 2.4 MHz
■ Low 50mV reference for low loss sensing
■ 1 µA shutdown current
8
10 Pin DFN
7
FLASH
EN
FB
6
R
SET
Now Available in Lead Free Packaging
■ PWM Dimming Control
■ Over voltage protection on output
■ Over current protection
APPLICATIONS
■ LED Torch/Flash for Cell
■ Over temperature protection
Phones, DSCs, and Camcorders
■ Space Saving 10-pin 3mm x 3mm DFN
Package
■ Generic Lighting/Flash/Strobe
Applications
DESCRIPTION
The SP6685 is a current regulated charge pump ideal for powering high brightness LEDs for
camera flash applications. The charge pump can be set to regulate two current levels for
FLASH and TORCH modes. The SP6685 automatically switches modes between step-up
and step-down ensuring that LED current does not depend on the forward voltage. A low
current sense reference voltage (50mV) allows the use of small 0603 current sensing
resistors. The SP6685 is offered in 10-pin DFN package.
TYPICAL APPLICATION CIRCUIT
V
IN
(2.7 - 4.3V)
®
V
IN
V
OUT
C
IN
C
1µF
OUT
C1
C2
4.7µF
P
S
GND
SP6685
C
D1
1W LED
FC
1µF
GND
FB
FLASH
EN
TORCH/FLASH
ENABLE
V
REF
= 50 - 150mV
R
SET
R
SET
88.7K
R
SENSE
0.22
Ω
Date: 12/15/04
SP6685 Charge Pump LED Driver for Camera Flash
© Copyright 2004 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
