The LT®3513 5-output adjustable switching regulatorprovides power for large TFT-LCD panels. The 38-pin5mm × 7mm QFN device can generate a 3.3V or 5V logicsupply along with the triple output supply required for theTFT-LCD panel. A lower voltage secondary logic supplymay also be generated with the addition of an externalNPN driven by the internal linear regulator. A step-downregulator provides a low voltage output, VLOGIC, with upto 1.2A of current while capable of operating from a wideinput range of 4.5V to 30V. A high power step-up converter,a lower power step-up converter and an invertingconverter provide the three independent output voltages:AVDD, VON and VOFF required by the LCD panel. A high-sidePNP provides delayed turn-on of the VON signal and canhandle up to 30mA. Protection circuitry ensures that VONis disabled if any of the four outputs are more than 10%below the programmed voltage.
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