DC-DC Converter for TFT LCDs Includes High-current Op Amps

Maxim Integrated Products has introduced the MAX1518B, a fully integrated, step-up dc-dc converter for active-matrix thin-film transistor liquid-crystal displays.
Nov. 9, 2005

Maxim Integrated Products has introduced the MAX1518B, a fully integrated, step-up dc-dc converter 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 five high-current operational amplifiers. Also integrated is a logic-controlled, high-voltage switch with adjustable delay.

The five op amps can drive the LCD backplane (VCOM) and the gamma-correction-divider string simultaneously. They feature a ±150-mA output current, a slew rate of 13 V/µs, a bandwidth of 12 MHz, and rail-to-rail inputs and outputs. The MAX1518B provides the regulated supply voltage for the panel source driver ICs. As a 1.2-MHz current-mode regulator, the MAX1518B integrates a 14-V n-channel MOSFET that allows the use of ultrasmall inductors and ceramic capacitors. It provides fast transient response to pulsed loads while achieving efficiencies over 85%. The two integrated, 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 is available in a 5-mm × 5-mm × 0.8-mm 32-pin thin QFN package. Prices start at $3.90 for 1000-unit quantities.

Sign up for Electronic Design Newsletters
Get the latest news and updates.

Voice Your Opinion!

To join the conversation, and become an exclusive member of Electronic Design, create an account today!