- 您现在的位置：买卖IC网 > Sheet目录307 > ADM8843ACPZ-REEL7 (Analog Devices Inc)IC LED DRVR WHITE BCKLGT 16LFCSP
Four White LED Backlight Driver
ADM8843
FEATURES
Drives 4 LEDs from a 2.6 V to 5.5 V (Li-Ion) input supply
1×/1.5×/2× fractional charge pump to maximize
power efficiency
0.3% typical LED current matching
Up to 88% power efficiency over Li-Ion range
Powers main and sub display LEDs with individual shutdown
Package footprint only 9 mm 2 (3 mm × 3 mm)
Package height only 0.55 mm
Low power shutdown mode
Shutdown function
Soft start limiting in-rush current
APPLICATIONS
Cellular phones with main and sub displays
White LED backlighting
Camera flash/strobes and movie light applications
GENERAL DESCRIPTION
The ADM8843 uses charge pump technology to provide the
power to drive up to four LEDs. The LEDs are used for back-
lighting a color LCD display that has regulated constant current
for uniform brightness intensity. The main display can use up to
three LEDs, and the sub display uses one LED. The CTRL1 and
CTRL2 digital input control pins control the shutdown opera-
tion and the brightness of the main and sub displays.
To maximize power efficiency, the charge pump can operate in
1×, 1.5×, or 2× mode. The charge pump automatically switches
among 1×/1.5×/2× modes, based on the input voltage, to
maintain sufficient drive for the LED anodes at the highest
power efficiency.
Improved brightness matching of the LEDs is achieved by a
feedback pin that senses individual LED current with a typical
matching accuracy of 0.3%.
Micro TFT color displays
DSC
PDAs
FUNCTIONAL BLOCK DIAGRAM
C1
1 μ F
C2
1 μ F
V CC
ADM8843
V OUT
C4
4.7 μ F
CHARGE PUMP
1 × /1.5 × /2 × MODE
C3
2.2 μ F
MAIN
SUB
OSC
CTRL1
CONTROL
CTRL2
I SET
R SET
LOGIC
LED
CURRENT
CONTROL
CIRCUIT
V REF
FB1
FB2
FB3
FB4
CURRENT CONTROLLED SINKS
GND
Figure 1.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2004–201 Analog Devices, Inc. All rights reserved.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ADP1653ACPZ-R7
IC LED DRVR PHOTO FLASH 16-LFCSP
ADP1712-EVALZ
BOARD EVALUATION ADP1712
ADP1720-EVALZ
BOARD EVAL FOR ADP1720-ADJ
ADP2140CPZ-REDYKIT
REDYKIT 2 BOARDS ADP2140ACPZ
ADP3110AKRZ-RL
IC MOSFET DRIVER DUAL 12V 8SOIC
ADP3120AJCPZ-RL
IC MOSFET DRIVER DUAL 12V 8-DFN
ADP3121JRZ-RL
IC MOSFET DRIVER DUAL 12V 8SOIC
ADP3415LRMZ-REEL
IC MOSFET DVR DUAL BOOTST 10MSOP
相关代理商/技术参数
ADM8843ACUZ-REEL7
制造商:Analog Devices 功能描述:
ADM8843EB-EVALZ
功能描述:BOARD EVAL ADM8843 RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:- 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD
ADM8845
制造商:AD 制造商全称:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights
ADM8845ACP
制造商:Analog Devices 功能描述:CHG PUMP STPUP 30MA 16LFCSP - Bulk
ADM8845ACP-REEL
制造商:Analog Devices 功能描述:Charge Pump STPUP 30mA 16-Pin LFCSP EP T/R
ADM8845ACP-REEL7
制造商:Analog Devices 功能描述:Charge Pump STPUP 30mA 16-Pin LFCSP EP T/R
ADM8845ACPZ
制造商:AD 制造商全称:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights
ADM8845ACPZ-REEL
功能描述:IC LED DRVR WHITE BCKLGT 16LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 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-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND