add8754dacpz-reel7 Analog Devices, Inc., add8754dacpz-reel7 Datasheet

add8754dacpz-reel7

Manufacturer Part Number

add8754dacpz-reel7

Description

Lcd Panel Power, Vcom, And Gate Modulation

Manufacturer

Analog Devices, Inc.

Datasheet

1.ADD8754DACPZ-REEL7.pdf (28 pages)

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FEATURES

Step-up switching regulator with 2 A power switch

350 mA logic voltage regulator

Gate pulse modulation circuitry

General

APPLICATIONS

TFT LCD panels for monitors, TVs, and notebooks

GENERAL DESCRIPTION

The ADD8754 is optimized for use in TFT LCD applications,

requiring only external charge pump components to provide all

the requirements for panel power, V

Included in a single chip are a high frequency step-up dc-to-dc

switching regulator, logic voltage regulator, V

gate pulse modulation circuitry.

The step-up dc-to-dc converter provides up to 20 V output and

includes a 2 A internal switch. Either a 650 kHz or 1.2 MHz step-

up switching regulator frequency can be chosen, allowing easy

filtering and low noise operation. It achieves 93% efficiency and

features soft start to limit the inrush current at startup.

The internal voltage regulator operates with an input voltage

range of 3 V to 5.5 V and delivers a load current of up to

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.

COM

650 kHz or 1.2 MHz switching frequency

Output adjustable to 20 V

Selectable output voltages: 2.5 V, 2.85 V, 3.3 V

Independently adjustable delay and falling slope

3 V to 5.5 V input

Undervoltage lockout

Thermal shutdown

24-lead, Pb-free LFCSP package

amplifier with 300 mA drive

COM

, and gate modulation.

COM

amplifier, and

350 mA. Three selectable output voltages are available: 2.5 V,

2.85 V, and 3.3 V.

The proprietary V

current of 300 mA and is specifically designed to drive TFT

panel loads.

The gate pulse modulator allows shaping of the TFT gate high

voltage to improve image quality. The integrated switches

provide the ability to independently control the delay and slope

for the gate drive voltage.

The ADD8754 is offered in a 24-lead, Pb-free LFCSP package and

is specified over the industrial temperature range of −40 to +85°C.

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

Tel: 781.329.4700

Fax: 781.461.3113

VDD_2

FREQ

SHDN

OUT

FUNCTIONAL BLOCK DIAGRAM

ADD8754

VGH

VGH_M VDD_1 CE RE VFLK

COM

AND THERMAL PROTECTION

UNDER VOLTAGE LOCKOUT

COMP

STEP-UP SWITCHING

amplifier can deliver a peak output

LCD Panel Power, V

VCOM AMPLIFIER

LOGIC VOLTAGE

MODULATION

REGULATOR

GATE PULSE

and

Figure 1.

VIN_1

VIN_2

ate Modulation

VDPM

ADD8754

www.analog.com

LDO_OUT

ADJ

POS

NEG

COM

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