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MAX8739

TFT, LCD, DC-DC Converter with Operational Amplifiers

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

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 converter 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 thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panels.

Data Sheet

Download	Rev 0	(PDF, 844kB)
E-Mail

An evaluation kit is available: MAX8739EVKIT

Key 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

Applications/Uses

Automotive Displays
LCD Monitor Panels
Notebook Computer Displays

Key Specifications:

Multifunction PMICs

Part Number

Primary Topology

Monitor/Control Features

DC-DC/Power Features

LCD/LED/Flash/CCD Features

V_IN
(V)

V_OUT
(V)

Max. I_OUT
(A)

Oper. Freq.
(kHz)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX8739

Step-Up

Shutdown

Adj. Frequency

Current Limit

Fixed Freq./PWM

Internal Pwr. FETs

Soft Start

Op. Amps.

TFT Bias

VCOM Buffer

1.8

5.5

1.24

1200

TQFN/20

$1.46 @1k

See All Multifunction PMICs (96)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Simplified Circuit

Reliability Reports

Reliability Report:	MAX8739.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8739ETP			Active	TQFN;20 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8739ETP+			Active	TQFN;20 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8739ETP+T			Active	TQFN;20 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8739ETP-T			Active	QFN;20 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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