TFT-LCD DC-DC Converter with Operational Amplifiers
TFT LCD, DC-DC Converter with a High-Performance Step-Up Regulator, Two Linear-Regulator Controllers, and Five High-Current Operational Amplifiers for Active-Matrix Thin-Film Transistor (TFT) Liquid-Crystal Displays (LCDs)
The MAX1518B includes a high-performance step-up
regulator, two linear-regulator controllers, and 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 step-up DC-DC converter provides the regulated
supply voltage for the panel source driver ICs. The converter
is a high-frequency (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 gate-on and gate-off linear-regulator controllers
provide regulated TFT gate-on and gate-off supplies
using external charge pumps attached to the switching
node. The MAX1518B includes five high-performance
operational amplifiers. These 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 (13V/µs), wide
bandwidth (12MHz), and rail-to-rail inputs and outputs.
The MAX1518B is available in a 32-pin thin QFN package
with a maximum thickness of 0.8mm for ultra-thin
LCD panels.
Key Features
Applications/Uses
2.6V to 6.5V Input Supply Range
1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.4A, 0.16Ω n-Channel MOSFET
High Efficiency (90%)
Linear-Regulator Controllers for VGON and VGOFF
High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
13V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
Logic-Controlled, High-Voltage Switch with Adjustable Delay
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