MAX1542 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – TFT LCD DC-to-DC Converter with Operational Amplifiers

19-2741; Rev 0; 4/03
EVAALVUAAILTAIOBNLEKIT
TFT LCD DC-to-DC Converter with
Operational Amplifiers
General Description
The MAX1542/MAX1543 include a high-performance
boost regulator and two high-current operational ampli-
fiers for active matrix, thin-film transistor (TFT), liquid-
crystal displays (LCDs). Also included is a logic-
controlled, high-voltage switch with adjustable delay.
The MAX1543 includes an additional high-voltage load
switch and features pin-selectable boost regulator
switching frequency.
The step-up DC-to-DC converter is a high-frequency
640kHz (MAX1543)/1.2MHz (MAX1542/MAX1543) cur-
rent-mode regulator with a built-in power MOSFET that
allows the use of ultra-small inductors and ceramic
capacitors. It provides fast transient response to pulsed
loads while producing efficiencies over 85%.
The two easy-to-use, high-performance operational
amplifiers can drive the LCD backplane (V_COM) and/or
the gamma correction divider string. The devices fea-
ture high short-circuit current (150mA), fast slew rate
(7.5V/µs), wide bandwidth (12MHz), and Rail-to-Rail^®
inputs and outputs.
The MAX1542/MAX1543 are available in 20-pin thin
QFN packages with a maximum thickness of 0.8mm for
ultra-thin LCD panel design.
Applications
Notebook Computer Displays
LCD Monitor Panels
PDAs
Car Navigation Displays
Pin Configurations
TOP VIEW
COM ₁
SRC 2
I.C. 3
PGND 4
AGND 5
MAX1543
15 FREQ
14 IN
13 LX
12 SUP
11 POS2
Features
o Ultra-High-Performance Step-Up Regulator
Fast Transient Response to Pulsed Load Using
Current-Mode Control Architecture
High-Accuracy Output Voltage (1.3%)
Built-In 14V, 1.2A, 0.2Ω N-Channel Power
MOSFET with Lossless Current-Sensing
High Efficiency (85%)
8-Step Current-Controlled Digital Soft-Start
o Two High-Performance Operational Amplifiers
150mA Output Short-Circuit Current
7.5V/µs Slew Rate
12MHz -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
Unity Gain Stable
o Logic-Controlled High-Voltage Switch with
Adjustable Delay
o Timer Delay Latch FB Fault Protection
o Thermal Protection
o 2.6V to 5.5V Input Operating Voltage Range
o 3.6mA (Switching), 0.45mA (Not Switching)
Quiescent Current
o Ultra-Thin 20-Pin Thin QFN Package
(5mm x 5mm x 0.8mm)
Ordering Information
PART
MAX1542ETP
MAX1543ETP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Thin QFN (5mm x 5mm)
20 Thin QFN (5mm x 5mm)
THIN QFN (5mm x 5mm)
Pin Configurations continued at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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