MAX8795AGCJ(2007) 查看數據表（PDF） - Maxim Integrated

零件编号

产品描述 (功能)

生产厂家

MAX8795AGCJ
(Rev.:2007)

TFT-LCD DC-DC Converter with Operational Amplifiers

Maxim Integrated 

19-0793; Rev 1; 6/07

EVAALVUAAILTAIOBNLEKIT

TFT-LCD DC-DC Converter with

Operational Amplifiers

General Description

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.

Applications

Notebook Computer Displays

LCD Monitor Panels

Automotive Displays

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX8795AETJ+

-40°C to +85°C

32 Thin QFN

5mm x 5mm

T3255+3

MAX8795AGCJ+

-40°C to +105°C

32 LQFP

7mm x 7mm

C32+2

+Denotes a lead-free package.

Pin Configurations appear at end of data sheet.

Features

o 2.5V to 5.5V Input Supply Range

o 1.2MHz Current-Mode Step-Up Regulator

Fast Transient Response to Pulsed Load

High-Accuracy Output Voltage (1%)

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

High Efficiency (85%)

o Linear-Regulator Controllers for VGON and VGOFF

o High-Performance Operational Amplifiers

±130mA Output Short-Circuit Current

45V/µs Slew Rate

20MHz, -3dB Bandwidth

Rail-to-Rail Inputs/Outputs

o Logic-Controlled, High-Voltage Switch with

Adjustable Delay

o Timer-Delay Fault Latch for All Regulator Outputs

o Thermal-Overload Protection

o 0.6mA Quiescent Current

Minimal Operating Circuit

VCN

VIN

IN

STEP-UP

CONTROLLER

LX

FB

COMP

PGND

AGND

MAX8795A

DRVP

GATE-ON

CONTROLLER

FBP

SRC

COM

SWITCH

CONTROL

DRN

SUP

NEG1

OUT1 OP1

POS1

NEG2

GATE-OFF

CONTROLLER

REF

DEL

CTL

DRVN

FBN

REF

NEG4

OUT2 OP2

POS2

OP4 OUT4

POS4

NEG5

OUT3

OP3

POS3

OUT5

OP5

EP

BGND

POS5

VCP

VMAIN

VCP

VGON

VCN

VGOFF

________________________________________________________________ Maxim Integrated Products 1

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.

Share Link: