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Dc-dc converter with five operational amplifiers

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MAXIM Integrated Products, represented by Arrow Electronics Australia Pty Ltd , has released 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 operational amplifiers drive the LCD backplane (VCOM) and/or the gamma-correction-divider string and feature high output current (±150mA), a fast slew rate (13V/μs), wide bandwidth (12MHz) and rail-to-rail inputs and outputs.

The MAX1518B provides the regulated supply voltage for the panel source driver ICs.

As a high-frequency (1.2MHz) current-mode regulator, the MAX1518B integrates a 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 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 small (5mm x 5mm), low-profile (0.8mm), 32-pin thin QFN package and operates over the -40°C to +85°C temperature range.

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