MAX17126

MAX17126/MAX17126A 19-4681; Rev 1; 3/10 EVAALVUAAILTAIOBNLEKIT Multi-Output Power Supplies with VCOM Amplifier and High-Voltage Gamma Reference for LCD TVs General Description The MAX17126/MAX17126A generate all the supply rails for thin-film transistor liquid-crystal display (TFT LCD) TV panels operating from a regulated 12V input. They include a step-down and a step-up regulator, a positive and a negative charge pump, an operational amplifier, a high-accuracy high-voltage gamma reference, and a high-voltage switch control block. The MAX17126/ MAX17126A can operate from input voltages from 8V to 16.5V and is optimized for an LCD TV panel running directly from 12V supplies. The step-up and step-down switching regulators feature internal power MOSFETs and high-frequency operation allowing the use of small inductors and capacitors, resulting in a compact solution. The step-up regulator provides TFT source driver supply voltage, while the step-down regulator provides the system with logic supply voltage. Both regulators use fixed-frequency currentmode control architectures, providing fast load-transient response and easy compensation. A current-limit function for internal switches and output-fault shutdown protects the step-up and step-down power supplies against fault conditions. The MAX17126/MAX17126A provide soft-start functions to limit inrush current during startup. In addition, the MAX17126/MAX17126A integrate a control block that can drive an external p-channel MOSFET...