Rainbow-electronics MAX1543 Manuel d'utilisateur télécharger pdf

General Description

The MAX1542/MAX1543 include a high-performance

boost regulator and two high-current operational ampli-

fiers for active matrix, thin-film transistor (TFT), liquid-

crystal displays (LCDs). Also included is a logic-

controlled, high-voltage switch with adjustable delay.

The MAX1543 includes an additional high-voltage load

switch and features pin-selectable boost regulator

switching frequency.

The step-up DC-to-DC converter is a high-frequency

640kHz (MAX1543)/1.2MHz (MAX1542/MAX1543) cur-

rent-mode regulator with a built-in power MOSFET that

allows the use of ultra-small inductors and ceramic

capacitors. It provides fast transient response to pulsed

loads while producing efficiencies over 85%.

The two easy-to-use, high-performance operational

amplifiers can drive the LCD backplane (V

COM

) and/or

the gamma correction divider string. The devices fea-

ture high short-circuit current (150mA), fast slew rate

(7.5V/µs), wide bandwidth (12MHz), and Rail-to-Rail

inputs and outputs.

The MAX1542/MAX1543 are available in 20-pin thin

QFN packages with a maximum thickness of 0.8mm for

ultra-thin LCD panel design.

Applications

Notebook Computer Displays

LCD Monitor Panels

PDAs

Car Navigation Displays

Features

♦ Ultra-High-Performance Step-Up Regulator

Fast Transient Response to Pulsed Load Using

Current-Mode Control Architecture

High-Accuracy Output Voltage (1.3%)

Built-In 14V, 1.2A, 0.2Ω N-Channel Power

MOSFET with Lossless Current-Sensing

High Efficiency (85%)

8-Step Current-Controlled Digital Soft-Start

♦ Two High-Performance Operational Amplifiers

150mA Output Short-Circuit Current

7.5V/µs Slew Rate

12MHz -3dB Bandwidth

Rail-to-Rail Inputs/Outputs

Unity Gain Stable

♦ Logic-Controlled High-Voltage Switch with

Adjustable Delay

♦ Timer Delay Latch FB Fault Protection

♦ Thermal Protection

♦ 2.6V to 5.5V Input Operating Voltage Range

♦ 3.6mA (Switching), 0.45mA (Not Switching)

Quiescent Current

♦ Ultra-Thin 20-Pin Thin QFN Package

(5mm x 5mm x 0.8mm)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

________________________________________________________________ Maxim Integrated Products 1

DRN

CTL

DEL

COMP

POS1

NEG1

OUT1

OUT2

NEG2

POS2

SUP

FREQ

AGND

PGND

I.C.

COM

SRC

MAX1543

THIN QFN (5mm x 5mm)

TOP VIEW

Pin Configurations

Ordering Information

19-2741; Rev 0; 4/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX1542ETP

-40°C to +85°C

20 Thin QFN (5mm x 5mm)

MAX1543ETP

-40°C to +85°C

20 Thin QFN (5mm x 5mm)

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Pin Configurations continued at end of data sheet.

1 2 3 4 5 6 ... 19 20

Résumé du contenu

Page 1 - Operational Amplifiers

General DescriptionThe MAX1542/MAX1543 include a high-performanceboost regulator and two high-current operational ampli-fiers for active matrix, thin-

Page 2

MAX1542/MAX1543TFT LCD DC-to-DC Converter withOperational Amplifiers10 _______________________________________________________________________________

Page 3