MAX8795A Maxim Integrated Products, MAX8795A Datasheet

MAX8795A

Manufacturer Part Number

MAX8795A

Description

TFT-LCD DC-DC Converter

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8795A.pdf (30 pages)

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Current page: 1 of 30
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The MAX8795A includes a high-performance step-up

regulator, two linear-regulator controllers, and five high-

current operational amplifiers for active-matrix, thin-film

transistor (TFT), liquid-crystal displays (LCDs). Also

included is a logic-controlled, high-voltage switch with

adjustable delay.

The step-up DC-DC converter provides the regulated

supply voltage for the panel source driver ICs. The con-

verter is a high-frequency (1.2MHz) current-mode regu-

lator with an integrated 20V n-channel MOSFET that

allows the use of ultra-small inductors and ceramic

capacitors. It provides fast transient response to pulsed

loads while achieving efficiencies over 85%.

The gate-on and gate-off linear-regulator controllers

provide regulated TFT gate-on and gate-off supplies

using external charge pumps attached to the switching

node. The MAX8795A includes five high-performance

operational amplifiers. These amplifiers are designed to

drive the LCD backplane (VCOM) and/or the gamma-

correction divider string. The device features high out-

put current (±130mA), fast slew rate (45V/µs), wide

bandwidth (20MHz), and rail-to-rail inputs and outputs.

The MAX8795A is available in a lead-free, 32-pin, thin

QFN package with a maximum thickness of 0.8mm for

ultra-thin LCD panels, as well as in a 32-pin LQFP

package with 0.8mm pin pitch.

19-0793; Rev 1; 6/07

+ Denotes a lead-free package.

Pin Configurations appear at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

MAX8795AETJ+

MAX8795AGCJ+

PART

Notebook Computer Displays

LCD Monitor Panels

Automotive Displays

________________________________________________________________ Maxim Integrated Products

-40°C to +105°C

-40°C to +85°C

TEMP RANGE

Ordering Information

General Description

32 Thi n QFN

5m m x 5m m

32 LQ FP

7m m x 7m m

PIN-

PACKAGE

Applications

TFT-LCD DC-DC Converter with

T3255+3

C32+2

CODE

PKG

o 2.5V to 5.5V Input Supply Range

o 1.2MHz Current-Mode Step-Up Regulator

o Linear-Regulator Controllers for V

o High-Performance Operational Amplifiers

o Logic-Controlled, High-Voltage Switch with

o Timer-Delay Fault Latch for All Regulator Outputs

o Thermal-Overload Protection

o 0.6mA Quiescent Current

Operational Amplifiers

Adjustable Delay

Fast Transient Response to Pulsed Load

High-Accuracy Output Voltage (1%)

Built-In 20V, 3A, 0.16Ω n-Channel MOSFET

High Efficiency (85%)

±130mA Output Short-Circuit Current

45V/µs Slew Rate

20MHz, -3dB Bandwidth

Rail-to-Rail Inputs/Outputs

Minimal Operating Circuit

COMP

SRC

COM

DRN

SUP

NEG1

OUT1

POS1

NEG2

OUT2

POS2

OUT3

POS3

OP1

OP2

OP3

CONTROLLER

GATE-ON

STEP-UP

CONTROL

MAX8795A

SWITCH

CONTROLLER

GATE-OFF

BGND

REF

OP4

OP5

PGND

AGND

DRVP

DRVN

NEG4

OUT4

POS4

NEG5

OUT5

POS5

FBP

DEL

CTL

FBN

REF

GON

Features

MAIN

and V

GON

GOFF

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