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SP6685_06 Datasheet

  • SP6685_06

  • 700mA Buck/Boost Charge Pump LED Driver

  • 16頁

  • SIPEX

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SP6685
700mA Buck/Boost Charge Pump LED Driver
FEATURES
VIN
1
10
VOUT
鈻?/div>
Output Current up to 700mA
C1
2
鈻?/div>
Up to 94% Efficiency in Torch Mode
SP6685
9
PGND
鈻?/div>
Adjustable FLASH Mode Current
8
SGND
C2
3
10 Pin DFN
鈻?/div>
Minimum External Components: No Inductors
7
FB
FLASH
4
鈻?/div>
Automatic Buck/Boost Mode Switchover
6
RSET
EN
5
鈻?/div>
Wide V
IN
Range: 2.7V to 5.5V
鈻?/div>
High Frequency Operation: 2.4 MHz
Now Available in Lead Free Packaging
鈻?/div>
Low 50mV Reference for low Loss Sensing
鈻?/div>
I
Q
< 1渭A in Shutdown
APPLICATIONS
鈻?/div>
PWM Dimming Control
鈻?/div>
White LED Torch/Flash for Cell
鈻?/div>
Automatic Soft Start Limits Inrush Current
Phones, DSCs, and Camcorders
鈻?/div>
Overvoltage Protection on Output
鈻?/div>
White LED Backlighting
鈻?/div>
Overcurrent/Temperature Protection
鈻?/div>
Generic Lighting/Flash/Strobe
Applications
鈻?/div>
Low Ripple and EMI
鈻?/div>
General Purpose High Current Boost
鈻?/div>
Ultra-low Dropout Voltage in Buck Mode
鈻?/div>
Space Saving 10-pin 3mm x 3mm DFN Package
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 the 10-pin DFN package.
TYPICAL APPLICATION CIRCUIT
V
IN
(2.7 - 5.5V)
O
C
IN
4.7渭F
V
IN
C
FC
1渭F
C1
C2
FLASH
EN
廬
V
OUT
C
OUT
1渭F
WLED
SP6685 P
GND
S
GND
FB
R
SET
R
SET
88K惟
TORCH/FLASH
ENABLE
R
SENSE
0.22惟
Date: 7/6/06 Rev B
SP6685, 700mA Buck/BoostCharge Pump LED Driver
漏 2006 Sipex Corporation
1

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