The MAX8728 generates all the 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 can operate from input voltages
from 7V to 13.2V and is optimized for LCD TV panel
and LCD monitor applications running directly from 12V
supplies.
The step-up and step-down regulators feature internal
power MOSFETs and high-frequency operation allowing
the use of small inductors and capacitors, resulting
in a compact solution. 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 MAX8728 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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