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Power-supply controller saves space, cost in LCD products

Sunnyvale, Calif. — Maxim Integrated Products has launched a highly integrated, multiple-output power-supply controller for TFT-LCD TVs and monitors. The MAX17014 device operates from an 8-V to 16.5-V input-voltage range, and is optimized for LCD panel applications that use a 12-V supply.

To save space, cost, and design time, this TFT-LCD solution integrates step-down and step-up regulators, positive and negative charge pumps, two operational amplifiers, and a Dual Mode, logic-controlled, high-voltage switch-control block. The integration of these components enables the MAX17014 to generate all the supply rails needed for the TFT-LCD panels used in TVs and monitors.

To further reduce total solution size and cost, the step-up and step-down regulators feature internal power MOSFETs and high-frequency operation, enabling the use of small inductors and capacitors. Both switching regulators use fixed-frequency, current-mode control architectures to provide fast load-transient response and easy compensation. They also provide soft-start functions to limit inrush current during startup, adjustable power-up timing, and 180-degree out-of-phase operation to minimize input ripple. Internal switch current limiting and output-fault shutdown protect the step-up and step-down power supplies against fault conditions.

To generate the supply rails for TFT-LCDs, the MAX17014 integrates positive and negative charge-pump regulators that provide TFT gate-driver supply voltages, as well as adjustable output voltages. An integrated switch-control block allows for the control of the positive TFT gate-driver voltage and power transfer. This highly integrated device also includes two high-performance operational amplifiers that are designed to drive the LCD backplane (VCOM). The amplifiers feature a ±150 mA output current, 45 V/microsecond slew rate, 20-MHz bandwidth, and rail-to-rail inputs and outputs.

Available in a 7 x 7x 0.8-mm, 48-pin TQFN package, the MAX17014 is fully specified over the -40°Cto +85°C extended temperature range.

Pricing: Starts at $4.50 (1000-up, FOB USA). An evaluation kit that includes recommended external components is available.

Datasheet: MAX17014

Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com

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