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SP7686 Datasheet

  • SP7686

  • Constant Current Flash Driver in DFN 2mm x 3mm

  • 1461.16KB

  • 16頁

  • SIPEX

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Solved by
SP7686/7686A
TM
Constant Current Flash Driver in DFN 2mm x 3mm
FEATURES
Output current up to 500mA
Up to 94% efficiency in 1x mode
Built-in LED current setting DAC
One line serial interface
2.4MHz switching frequency
FB Reference voltage adjusts in 10mV steps
from 60mV to 360mV
DAC signal shutdown control
Power-saving shutdown mode of 10nA
PWM brightness control for DAC
Fast turn-on (<150碌s)
3.5s Timeout function to protect the LED
Thermal shutdown protection
Built-in over-voltage and over-current protection
Fixed output versions available (SP7686A)
Automatic soft start limits in-rush current
Lead Free, RoHS Compliant Package:
Space saving 8-pin 2x3mm DFN
DESCRIPTION
The SP7686 is a current regulated charge pump ideal for powering high-brightness LEDs for camera FLASH
applications of up to 500mA. The charge pump automatically switches between step-up and step-down modes
ensuring that the LED current does not depend on the forward voltage. A low current sense reference voltage
(60mV to 360mV) allows the use of small 0603 current sensing resistors. The SP7686 has a DAC programmable
feedback reference voltage allowing the user to precisely set FLASH and TORCH output current levels, while the
fixed version SP7686A has set levels of FLASH and TORCH reference voltage. Both parts have over-voltage, over-
current, over-temperature and FLASH time-out protection features. The SP7686 is offered in the 2x3mm 8-pin DFN package.
TYPICAL APPLICATION CIRCUITS
0.22uF
VIN
10uF
CTRL
SP7686
SP7686A
VIN C1
C2
CTRL
C2
2.2uF
FB
SGND
0.68
500m
A
SP7686
PGND
SGND
0.22uF
VIN
10uF
FLASH
EN
VIN
C1
C2
C2
2.2uF
FB
PGND
0.33
500m
A
SP7686A
FLAS
EN
Jul16-07 RevP
SP7686: 500mA LED Driver
錚?/div>
2007 Sipex Corporation
-1-

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