MAX8739 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – TFT, LCD, DC-DC Converter with Operational Amplifiers

19-3983; Rev 0; 1/06
EVAALVUAAILTAIOBNLEKIT
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 fea-
ture 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 × 5mm thin
QFN package with a maximum thickness of 0.8mm for
ultra-thin LCD panels.
Applications
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
Ordering Information
PART
TEMP RANGE
MAX8739ETP+ -40°C to +85°C
+ Denotes lead-free package.
* EP = Exposed pads.
PIN-PACKAGE ^PKG
CODE
20 Thin QFN-EP* _T2055-2
(5mm x 5mm)
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
TO VCOM
BACKPLANE
LX
IN
FB
MAX8739
FREQ
AGND
COMP
NEG1
OUT1
NEG2
OUT2
LDO
PGND
SUP
POS1
POS2
VMAIN
Pin Configuration appears at end of data sheet.
DEL
SRC
DRN
FROM TCON
CTL
COM
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