Overview
The MAX8728 provides the various supply voltages required for thin-film transistor (TFT) liquid crystal display (LCD) panels in televisions and displays. The chip includes a buck and boost regulator, a positive and negative charge pump, and a dual mode logic controlled high voltage switch module. Operating from an input voltage range of 7V to 13.2V, it is suitable for LCD TV panels and LCD monitors that are powered directly from 12V.
The boost and buck regulators feature an internal power MOSFET that operates in high frequency mode, allowing the use of small inductors and capacitors for a compact solution. Both switching regulators feature a fixed frequency, current mode control structure that enables fast load transient response for easy compensation. Positive and negative charge pump regulators provide TFT gate drive voltage. An external resistor divider is used to regulate the two output voltages.
The MAX8728 is available in a small (5mm x 5mm), ultra-thin (0.8mm), 32-pin QFN package and operates over the -40°C to +85°C temperature range.
characteristic
Optimized for 10.8V to 13.2V input power
7V to 13.2V input range selectable operating frequency (500kHz/1MHz/1.5MHz)
Current mode buck regulator
14V internal n-channel MOSFET
1.5% output precision current mode boost regulator
15V internal n-channel MOSFET
1% output accuracy
True Shutdown (output to 0)
180° Inverting Switch Control Adjustable Positive/Negative Charge Pump Provides Soft Start and Timer Fault Latching for All Outputs Logic Control High Voltage Switch Power Up and Power Down Sorting Thermal Overload Protection
application
LCD monitor
LCD TV
MAX8728 Application Circuit
See the PDF document for details!
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