TFT LCD DC-to-DC Converter with Operational Amplifiers
TFT LCD DC-DC Converters Include a High-Performance Boost Regulator and Two High-Current Operational Amplifiers for Active-Matrix, Thin-Film Transistor (TFT), Liquid-Crystal Displays (LCDs)
The MAX1542/MAX1543 include a high-performance boost regulator and two high-current operational amplifiers 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) current-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 (VCOM) and/or the gamma correction divider string. The devices feature 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.
Key Features
Applications/Uses
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
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)
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.
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