Datasheet > ADM8845ACPZ-WP2

ADM8845ACPZ-WP2

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
亚德诺 - ADI		驱动器泵
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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ADM8845ACPZ-WP2 数据手册

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

1µF

ADM8845

OUT

CHARGE PUMP

1×/1.5×/2× MODE

2.2µF

4.7µF

MAIN

SUB

OSC

CTRL1

CTRL2

CONTROL

LOGIC

REF

FB1

FB2

FB3

FB4

FB5

FB6

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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