SP6685 Datasheet, PDF (1/10 Pages) Sipex Corporation – Charge Pump LED Driver For Camera Flash

®
Preliminary
SP6685
Charge Pump LED Driver For Camera Flash
FEATURES
■ High Output Current Charge Pump: 700mA
VIN 1
10 VOUT
■ Adjustable FLASH mode
■ 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
C1 2
C2 3
FLASH 4
EN 5
SP6685
10 Pin DFN
9 PGND
8 _SGND
7 _FB
6 _RSET
■ 1 µA shutdown current
■ PWM Dimming Control
Now Available in Lead Free Packaging
■ Over voltage protection on output
■ Over current protection
■ Over temperature protection
■ Space Saving 10-pin 3mm x 3mm DFN
Package
APPLICATIONS
■ LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
■ 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)
C_IN
4.7µF
C_FC
1µF
TORCH/FLASH
ENABLE
V_IN
® _VOUT
C1 _SP6685 P_GND
C2
FLASH
EN
S_GND
FB
R_SET
C_OUT
1µF
D1
1W LED
V_REF = 50 - 150mV
R_SET
88.7K
R_SENSE
0.22Ω
Date: 12/15/04
SP6685 Charge Pump LED Driver for Camera Flash
1
© Copyright 2004 Sipex Corporation