Maxim introduces the MAX8728 power supply, which generates all supply rails for thin-film transistor (TFT), liquid-crystal display (LCD) panels in TVs and monitors. It includes step-down and step-up regulators, positive and negative charge pumps, and a dual-mode, logic-controlled, high-voltage switch-control block. The MAX8728 has a 7V to 13.2V input supply voltage, and is optimized for LCD TV panel and LCD monitor applications running directly from 12V supplies. The MAX8728's step-up and step-down regulators feature internal power MOSFETs. Both switching regulators use fixed-frequency, current-mode control architectures, providing fast load-transient response and easy compensation.

The positive and negative charge-pump regulators provide TFT gate-driver supply voltages. Both output voltages can be adjusted with external resistive voltage dividers. The switch-control block allows the manipulation of the positive TFT gate-driver voltage.Soft-start functions limit inrush current during startup. An integrated current-limit function for internal switches and output-fault shutdown protects the power supplies against fault conditions. The MAX8728 also provides adjustable power-up timing. The MAX8728 is available in a small (5mm x 5mm), low-profile (0.8mm), 32-pin TQFN package, and operates over the -40 degrees Celsius to +85 degrees Celsius temperature range. Prices start at $4.15 (1000-up, FOB USA). A preassembled MAX8728 evaluation kit with recommended external components is available.