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Optoelectronics/Displays??

Elantec regulators integrate FET boost, Vcom regulator

Posted: 27 Mar 2002 ?? ?Print Version ?Bookmark and Share

Keywords:el7580cl? el7581cre? elantec? dc regulator ic? dc/dc regulator ic?

The EL7580CL and EL7581CRE multi-output dc/dc regulator ICs from Elantec Semiconductor Inc. integrate a FET boost regulator and two regulated charge pumps. The chips are designed for use in 14-inch to 20-inch TFT/LCD monitors, notebook and TV LCDs, and PDA displays.

The FET boost regulator provides the TFT/LCD column driver power, generating 12V at up to 700mA continuous current from a 5V input, with a typical efficiency of 90 percent. It provides regulated voltages ranging from 5V to 18V.

A pair of low-power, charge pump, control circuits provides both a regulated positive output voltage between 5V to 40V, and a regulated negative output voltage between -40V to -5V. The positive and negative charge pump voltages provide the TFT/LCD row driver power.

In addition, the EL7580CL provides a second linear regulator provides the supply for the common plate of the TFT/LCD panel, generating the Vcom voltage ranging from 2V to 13V, with a maximum continuous current of 100mA.

Richard Powers, Elantec's Director of Strategic Marketing for Power Products, stated, "By integrating all of the TFT/LCD regulator functions into a single chip, these Elantec multi-output regulators reduce component count, minimize printed circuit board area, and lower the overall cost of the regulated power supplies," said Richard Powers, Elantec's director of strategic marketing for power products.

Both ICs operate from -40C to 85C and are available in a 32-pin LPP housing for the EL7580CL, and 20-pin HTSSOP housing for the EL7581CRE.

The EL7580CL is priced at $2.90 and the EL7581CRE is at $2.55 each in quantities of 1,000 pieces.





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