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ADM8843ACPZ-REEL7

更新时间： 2024-02-13 12:15:37

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 PC
页数	文件大小	规格书
16页	319K
描述
4 White LED Backlight Driver

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ADM8843ACPZ-REEL7 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	QFN
包装说明：	3 X 3 MM, 0.55 MM HEIGHT, ROHS COMPLIANT, MO-220VEED-2, LFCSP-16	针数：	16
Reach Compliance Code：	unknown	风险等级：	5.7
Is Samacsys：	N	接口集成电路类型：	LED DISPLAY DRIVER
JESD-30 代码：	S-XQCC-N16	JESD-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：	4	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	认证状态：	COMMERCIAL
座面最大高度：	0.9 mm	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
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

ADM8843ACPZ-REEL7 数据手册

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4 White LED Backlight Driver

ADM8843

FEATURES

GENERAL DESCRIPTION

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 mm²(3 mm × 3 mm)

Package height only 0.9 mm

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, having 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.

Low power shutdown mode

Shutdown function

Soft-start limiting in-rush current

To maximize power efficiency, the charge pump can operate in

either 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.

APPLICATIONS

Cellular phones with main and sub displays

White LED backlighting

Camera flash/strobes and movie light applications

Micro TFT color displays

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%.

DSC

PDAs

FUNCTIONAL BLOCK DIAGRAM

1µF

ADM8843

OUT

CHARGE PUMP

1×/1.5×/2× MODE

2.2µF

4.7µF

MAIN

SUB

OSC

CTRL1

CTRL2

CONTROL

LOGIC

REF

FB1

FB2

FB3

FB4

LED

SET

CURRENT

CONTROL

CIRCUIT

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

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