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MAX8739

TFT, LCD, DC-DC Converter with Operational Amplifiers

Maxim Integrated 

MAX8739

EVALUATION KIT AVAILABLE

TFT, LCD, DC-DC Converter with

Operational Amplifiers

General Description

The MAX8739 includes a high-performance, step-up

regulator and two high-current operational amplifiers

for active-matrix thin-film transistor (TFT) liquid-crystal

displays (LCDs). The input supply voltage range of

the MAX8739 is from 1.8V to 5.5V. The device also

includes 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 (600kHz/1.2MHz) current-mode

regulator with an integrated 14V 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 two high-performance operational amplifiers are

designed to drive the LCD backplane (VCOM) and/or the

gamma-correction-divider string. The devices feature high

output current (±150mA), fast slew rate (7.5V/µs), wide

bandwidth (12MHz), and rail-to-rail inputs and outputs.

The MAX8739 is available in a 20-pin, 5mm x 5mm TQFN

package with a maximum thickness of 0.8mm for ultra-

thin LCD panels.

Applications

●● Notebook Computer Displays

●● LCD Monitor Panels

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX8739ETP+

-40°C to +85°C

20 TQFN-EP*

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

*EP = Exposed pads.

Features

●● 1.8V to 5.5V Input Supply Range

●● 600kHz/1.2MHz Current-Mode Step-Up Regulator

• Fast Transient Response to Pulsed Load

• High-Accuracy Output Voltage (1.5%)

• Built-In 14V, 1.9A, 0.2Ω n-Channel MOSFET

• High Efficiency (> 85%)

• 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

●● Logic-Controlled, High-Voltage Switch with Adjustable

Delay

●● Built-In Power-Up Sequence

●● Input Supply Undervoltage Lockout

●● Timer Delay Fault Latch for All Regulator Outputs

●● Thermal-Overload Protection

Simplified Operating Circuit

VIN

+1.8V TO +5.5V

VMAIN

TO VCOM

BACKPLANE

LX

IN

FB

MAX8739

FREQ

AGND

COMP

NEG1

OUT1

NEG2

OUT2

LDO

PGND

SUP

POS1

POS2

Pin Configuration appears at end of data sheet.

DEL

SRC

DRN

FROM TCON

CTL

COM

19-3983; Rev 1; 7/14

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