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

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, 0.16

Ω n-Channel MOSFET

High Efficiency (85%)

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

TFT-LCD DC-DC Converter with

Operational Amplifiers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

STEP-UP

CONTROLLER

GATE-ON

CONTROLLER

SWITCH

CONTROL

GATE-OFF

CONTROLLER

REF

LX

FB

PGND

AGND

DRVP

FBP

DEL

CTL

DRVN

FBN

NEG4

REF

POS4

NEG5

POS5

OUT4

OUT5

BGND

NEG2

POS2

OP3

POS3

OUT2

OUT3

POS1

OUT1

NEG1

SUP

COM

DRN

SRC

COMP

IN

MAX8795A

OP2

OP1

OP5

OP4

EP

Minimal Operating Circuit

19-0793; Rev 5; 5/12

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX8795AETJ+

-40

°C to +85°C

32 Thin QFN

MAX8795AGCJ+

-40

°C to +105°C

32 LQFP

MAX8795AGCJ/V+

-40

°C to +105°C

32 LQFP

MAX8795AGTJ+

-40

°C to +105°C

32 TQFN

MAX8795AGTJ/V+

-40

°C to +105°C

32 TQFN

Pin Configurations appear at end of data sheet.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive-qualified part.

EVALUATION

KIT

AVAILABLE