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LT1943 - High Current Quad Output Regulator for TFT LCD Panels

The LT1943 quad output adjustable switching regulator provides power for large TFT LCD panels. The device, housed in a low profile 28 pin thermally enhanced TSSOP package, can generate a 3.3V or 5V logic supply along with the triple output supply required for the TFT LCD panel. Operating from an input range of 4.5V to 22V, a step-down regulator provides a low voltage output VLOGIC with up to 2A current. A high-power step-up converter, a lowerpower step-up converter and an inverting converter provide the three independent output voltages AVDD, VON and VOFF required by the LCD panel. A high-side PNP provides delayed turn-on of the VON signal and can handle up to 30mA. Protection circuitry ensures that VON is disabled if any of the four outputs are more than 10% below the programmed voltage.

All switchers are synchronized to an internal 1.2MHz clock, allowing the use of low profile inductors and ceramic capacitors throughout. A current mode architecture provides excellent transient response. For best flexibility, all outputs are adjustable. Soft-start is included in all four channels. A PGOOD pin can drive an optional PMOS pass device to provide output disconnect for the AVDD output.

Features 4 Integrated Switches: 2.4A Buck, 2.6A Boost, 0.35A Boost, 0.35A Inverter (Guaranteed Minimum Current Limit) Fixed Frequency, Low Noise Outputs Soft-Start for all Outputs Externally Programmable VON Delay Integrated Schottky Diode for VON Output PGOOD Pin for AVDD Output Disconnect 4.5V to 22V Input Voltage Range PanelProtectTM Circuitry Disables VON Upon Fault Available in Thermally Enhanced 28-Lead TSSOP Typical Application

Applications Large TFT-LCD Desktop Monitors Flat Panel Televisions Packaging

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