MAX17126/MAX17126A
19-4681; Rev 1; 3/10
EVAALVUAAILTAIOBNLEKIT
Multi-Output Power Supplies with VCOM Amplifier and Hi...
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...