SP7685
SP7685 is Buck/Boost Charge Pump LED Driver manufactured by Sipex Corporation.
FEATURES
- Output Current up to 1.2A
- Up to 94% Efficiency in Torch Mode
- Adjustable FLASH Mode Current
- Minimum External ponents: No Inductors
- Automatic Buck/Boost Mode Switchover
- Wide VIN Range: 2.7V to 5.5V
- High Frequency Operation: 2.4 MHz
- 50m V Reference for low Loss Sensing
- IQ < 2μA in Shutdown
- PWM Dimming Control
- Automatic Soft Start Limits Inrush Current
- Overvoltage Protection on Output
- Overcurrent/temperature Protection
- Low Ripple and EMI
- Ultra-low Dropout Voltage in Buck Mode
- 2.6 Second Timeout in Flash Mode
- Space Saving Ro HS pliant, Lead Free Package: 10-pin 3mm x 3mm DFN
VIN C1 C2 FLASH EN
1 2 3 4 5 10
VOUT PGND SGND FB RSET
10 Pin DFN
9 8 7 6
APPLICATIONS
- White LED Torch/Flash for Cell Phones, DSCs, and Camcorders
- White LED Backlighting
- Generic Lighting/Flash/Strobe Applications
- General Purpose High Current Boost
DESCRIPTION
The SP7685 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 SP7685 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 (50m V) allows the use of small 0603 current sensing resistors. The SP7685 is offered in 10-pin DFN package. TYPICAL APPLICATION CIRCUIT
VIN (3.0
- 4.2V)
CIN 10μF VIN CFC 1μF
¤
VOUT COUT 10μF 1A Flash 200m A Torch PWF1 WLED
C1 SP7685 PGND C2 SGND FLASH EN FB RSET RSET 80KΩ
TORCH/FLASH ENABLE
RSENSE 0.22Ω
Date: 6/20/06 Rev...
