ADM8840

更新时间： 2024-01-29 05:18:09

品牌	Logo	应用领域
亚德诺 - ADI		稳压器驱动泵
页数	文件大小	规格书
10页	166K
描述
Charge Pump Regulator & COM Driver for Color TFT Panel

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技术参数
数据手册

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ADM8840 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	5 X 5 MM, LFCSP-32	针数：	32
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.23
模拟集成电路 - 其他类型：	SWITCHED CAPACITOR REGULATOR	最大输入电压：	3.6 V
最小输入电压：	2.7 V	标称输入电压：	3.3 V
JESD-30 代码：	S-CQCC-N32	JESD-609代码：	e0
长度：	5 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	32
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	CERAMIC, METAL-SEALED COFIRED	封装代码：	VQCCN
封装等效代码：	LCC32,.2SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, VERY THIN PROFILE	峰值回流温度（摄氏度）：	240
电源：	3 V	认证状态：	Not Qualified
座面最大高度：	0.9 mm	子类别：	Power Management Circuits
标称供电电压 (Vsup)：	3 V	表面贴装：	YES
切换器配置：	TRIPLER	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn85Pb15)
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：	NOT SPECIFIED
宽度：	5 mm	Base Number Matches：	1

ADM8840 数据手册

PRELIMINARY TECHNICAL DATA

Charge Pump Regulator & COM Driver

for Color TFT Panel

ADM8840

Preliminary Technical Data

Programmable COM Driver to prevent Screen-Burn

3 Voltages (5.0V,15.0V,-15.0V) from one 3V Supply

Power Efficiency optimised for use with TFT in mobile

phones

FEATURES

FUNCTIONAL BLOCK DIAGRAM

-15V

0.22␮F

VOLTAGE

INVERTER

C4+

C4-

Low Quiescent Current

Low Shutdown Current (<5uA)

ShutdownFunction

0.22␮F

+15V

ADM8840

0.22␮F

C2+

TRIPLE

0.22

␮

C2-

C3+

VOLTAGE

TRIPLER

DOUBLE

0.22

␮

APPLICATIONS

Handheld Instruments

TFT LCD Panels

C3-

OSCILLATOR

TIMING

GENERATOR

5VIN

+5V

5VOUT

2.2␮F

LDO

VOLTAGE

REGULATOR

SHUTDOWN

CONTROL

SHDN

DISCHARGE

CellularPhones

VOUT

C10

C1+

C1-

VOLTAGE

DOUBLER

3.3␮F

CONTROL

LOGIC

3.3␮F

4.7

␮

C5+

VOLTAGE

ADDER

3.3␮F

C5-

DAC1_IN

DAC1_SD

VREF

ADD_OUT

C11

GENERAL DESCRIPTION

4.7␮F

INT/EXT

DAC

CLK

The ADM8840 combines a charge pump regulator and a

Common Line (COM) driver in a single chip solution for use

in TFT LCD’s. The device provides an LCD controller and

grayscale DAC supply voltage of 5.0V (±±2)ꢀ ± gate drive

voltages of +15V and -15V and a COM driver voltage. This

COM Driver voltage alternates the polarity of the Common

line voltage every line (or every frame) on the display in order

to prevent screen-burn occuring over time. The ADM8840

is powered by a single 3.0V supply.

SERIAL

INTERFACE

DATA

CS / LDAC

TRANS_OUT

C12

INT/EXT

DAC

4.7␮F

POWER

BUFFER

LEVEL

TRANSLATOR

COM_OUT_AC

C13

COM_IN

4.7␮F

COM_OUT

DAC2_SD

DAC2_IN

5.5k⍀

PANEL

22nF

GND

The ADM8840 has an internal 100KHz oscillator for driving

the charge pumps.

The COM Driver section of the ADM8840 can be used to

generate the alternate frame or line inversion of the COM

line of the LCD panel. The ADM8840 receives the COM

clock from the controller with a frequency up to 10kHz and

allows programmable conditioning of its amplitude and

centre voltage through the use of on-board DAC’s. This

allows programmable elimination of display flicker caused

by the COM inversion.

The ADM8840 provides power up sequencing of the -15V

and +15V gate drive outputsꢀ ensuring the -15V starts to

power up before the +15V.

The ADM8840 has a number of power save featuresꢀ includ-

ing low power Shutdown. The 5.0V output consumes the

most powerꢀ so Power Efficiency is also maximised on this

output with an oscillator enabling scheme (Green Idle^TM).

The COM_OUT amplitude can be programmed from 4.0V

to 7.0V in steps of ±8mV. The COM_OUT centre voltage

can be programmed to 0.9V to ±.8V in steps of 14mV.

The ADM8840 is fabricated using CMOS technology for

minimal power consumption. The part is packaged in a 3±-

pin LFCSP package.

^TMGreen Idle is a registered trademark of Analog Devices Inc.

REV. PrG 2/03

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

WorldWide Web Site: http://www.analog.com

Fax: 781/326-8703

Analog Devices, Inc., 2003

12 3 4 5 6 7...10

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