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ADM8845ACP-REEL

更新时间： 2024-02-09 09:57:03
品牌 Logo 应用领域
亚德诺 - ADI 显示驱动器驱动程序和接口接口集成电路泵
页数 文件大小 规格书
20页 372K
描述
Charge Pump Driver for LCD White LED Backlights

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ADM8845ACP-REEL 技术参数

是否无铅：含铅是否Rohs认证：符合
生命周期：Obsolete零件包装代码：QFN
包装说明：HVQCCN, LCC16,.12SQ,20针数：16
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.32
Is Samacsys：N接口集成电路类型：LED DISPLAY DRIVER
JESD-30 代码：S-XQCC-N16JESD-609代码：e3
长度：3 mm湿度敏感等级：3
复用显示功能：NO功能数量：1
区段数：6端子数量：16
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：UNSPECIFIED封装代码：HVQCCN
封装等效代码：LCC16,.12SQ,20封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：260
电源：2.6/5.5 V认证状态：Not Qualified
座面最大高度：1 mm子类别：Display Drivers
最大供电电压：5.5 V最小供电电压：2.6 V
标称供电电压：3.3 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：40宽度：3 mm
Base Number Matches：1

ADM8845ACP-REEL 数据手册

 浏览型号ADM8845ACP-REEL的Datasheet PDF文件第2页浏览型号ADM8845ACP-REEL的Datasheet PDF文件第3页浏览型号ADM8845ACP-REEL的Datasheet PDF文件第4页浏览型号ADM8845ACP-REEL的Datasheet PDF文件第5页浏览型号ADM8845ACP-REEL的Datasheet PDF文件第6页浏览型号ADM8845ACP-REEL的Datasheet PDF文件第7页 
Charge Pump Driver for LCD  
White LED Backlights  
ADM8845  
GENERAL DESCRIPTION  
FEATURES  
Drives 6 LEDs from 2.6 V to 5.5 V (Li-Ion) input supply  
1×/1.5×/2× fractional charge pump to maximize power  
efficiency  
The ADM8845 uses charge pump technology to provide the  
power required to drive up to six LEDs. The LEDs are used for  
backlighting a color LCD display, having regulated constant  
current for uniform brightness intensity. The main display can  
have up to four LEDs, and the sub display can have one or two  
LEDs. The digital CTRL1 and CTRL2 input control pins control  
the shutdown operation and the brightness of the main and sub  
displays.  
1% max 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 mm2 (3 mm × 3 mm)  
Package height only 0.9 mm  
Low power shutdown mode  
To maximize power efficiency, the charge pump can operate in  
either a 1×, 1.5×, or 2× mode. The charge pump automatically  
switches between 1×/1.5×/2× modes based, on the input voltage,  
to maintain sufficient drive for the LED anodes at the highest  
power efficiency.  
Shutdown function  
Soft-start limiting in-rush current  
APPLICATIONS  
Cellular phones with main and sub displays  
White LED backlighting  
Camera flash/strobes and movie lights  
Micro TFT color displays  
DSC  
Improved brightness matching of the LEDs is achieved by a  
feedback pin to sense individual LED current with a maximum  
matching accuracy of 1%.  
PDAs  
FUNCTIONAL BLOCK DIAGRAM  
C1  
C2  
1µF  
1µF  
V
ADM8845  
CC  
V
OUT  
CHARGE PUMP  
1×/1.5×/2× MODE  
C3  
2.2µF  
C4  
4.7µF  
MAIN  
SUB  
OSC  
CTRL1  
CTRL2  
CONTROL  
LOGIC  
V
REF  
FB1  
FB2  
FB3  
FB4  
FB5  
FB6  
LED  
I
SET  
CURRENT  
CONTROL  
CIRCUIT  
R
SET  
CURRENT CONTROLLED SINKS  
GND  
Figure 1.  
Rev. 0  
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  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  
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