参数资料
型号: SP7686ER-L/TR
厂商: Exar Corporation
文件页数: 1/16页
文件大小: 0K
描述: IC LED DVR CONST CURRENT 8DFN
标准包装: 3,000
恒定电流:
拓扑: PWM,降压(降压),升压(升压),切换式电容器(充电泵)
输出数: 1
类型 - 主要: 闪灯/白光,通用
类型 - 次要: 高亮度 LED(HBLED),白色 LED
频率: 2MHz ~ 2.8MHz
电源电压: 2.7 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 8-VFDFN 裸露焊盘
供应商设备封装: 8-DFN(3x2)
包装: 带卷 (TR)
工作温度: -40°C ~ 85°C
S P 7 6 8 6 / S P 7 6 8 6 A
C o n s t a n t C u r r e n t F l a s h D r i v e r i n D F N 2 m m x 3 m m
January 2010
GENERAL DESCRIPTION
The SP7686/SP7686A are current regulated
charge pumps ideal for powering high power,
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 and SP7686A are offered in a
RoHS compliant “green”/halogen free space
saving 8-pin 2x3mm DFN package.
Rev. 2.1.0
APPLICATIONS
? Cell Phone Flash
? Cell Phone Torch
? General LED applications
FEATURES
? Output current up to 500mA
? Up to 94% efficiency
? Single Wire serial interface
? 2.4MHz switching frequency
? FB Reference voltage adjusts in 10mV
steps from 60mV to 360mV
? 10nA Shutdown
? PWM brightness control for DAC
? Fast turn-on (<150 μ s)
? 3.5s Timeout function
? Thermal shutdown protection
? Built-in over-voltage and over-current
protection
? Fixed output SP7686A
? Automatic soft start limits in-rush
current
? RoHS Compliant, “Green”/Halogen
Free 8-pin 2x3mm DFN
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP7686 and SP7686A Application Diagrams
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
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