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Linear Tech regulator suits TFT LCD apps

Posted: 02 Jan 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1943? switching regulator?

Linear Technology Corp. has released the LT1943 high current, quad output, adjustable switching regulator developed for 22-inch and larger TFT LCD applications.

Operating from an input range of 4.5V to 22V, the device delivers independent outputs for VLOGIC, AVDD, VON, and VOFF as required by TFT LCD applications. It contains a 2.4A buck regulator to power VLOGIC, a 2.6A boost regulator to drive TFTs, a high voltage TFT biasing output and an inverter for negative TFT biasing. All of the switchers are synchronized to an internal 1.2MHz clock, keeping switching noise out of critical audio bands and enabling the use of low profile inductors and tiny ceramic input and output capacitors.

The product includes the Panel Protect feature that disables VON if any of the four outputs are >10 percent below the normal reset output voltage. This prevents the TFT panel from being exposed to an inrush of VON current and effectively "flash lighting" the entire TFT panel, creating damage to the panel. A high side pnp transistor provides a delayed turn-on of the VON signal to insure it comes on only after all the other outputs are powered up. The VON signal can provide up to 30mA of bias current enabling it to drive large panels. A PGOOD output is also included to drive an optional PMOS pass device to provide output disconnect for the AVDD output.

Offered in a 28-Lead TSSOP package, the LT1943EFE is available for $4.75 each in 1,000-piece quantities.

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