Rainbow Electronics MAX1543 - Manual

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
Features
♦ 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, 0.2
Ω N-Channel Power
MOSFET with Lossless Current-Sensing
High Efficiency (85%)
8-Step Current-Controlled 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
Unity Gain Stable
♦ Logic-Controlled High-Voltage Switch with
Adjustable Delay
♦ Timer Delay Latch FB Fault Protection
♦ Thermal Protection
♦ 2.6V to 5.5V Input Operating Voltage Range
♦ 3.6mA (Switching), 0.45mA (Not Switching)
Quiescent Current
♦ Ultra-Thin 20-Pin Thin QFN Package
(5mm x 5mm x 0.8mm)
MAX1542/MAX1543
TFT LCD DC-to-DC Converter with
Operational Amplifiers
________________________________________________________________ Maxim Integrated Products 1
20 19 18 17 16
DRN CTL DEL COMP FB
6 7 8 9 10
POS1 NEG1 OUT1 OUT2 NEG2
11
12
13
14
15
POS2
SUP
LX
IN
FREQ
5
4
3
2
1
AGND
PGND
I.C.
COM
SRC
MAX1543
THIN QFN (5mm x 5mm)
TOP VIEW
Pin Configurations Ordering Information
19-2741; Rev 0; 4/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX1542ETP -40°C to +85°C 20 Thin QFN (5mm x 5mm)
MAX1543ETP -40°C to +85°C 20 Thin QFN (5mm x 5mm)
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations continued at end of data sheet.