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TFT-LCD regulator offers a cool way out

Posted: 30 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:el7585a? quad-output regulator? intersil?

EL7585A quad-output regulator

Touting extremely high efficiency and thus cooler system operation, the EL7585A quad-output regulator from Intersil provides a highly integrated power source for large (19 inches and greater) thin-film-transistor liquid-crystal displays (TFT-LCDs) of the kind used in TVs and desktop monitors. Its so-called boost supply boasts the industry's largest integrated field-effect transistor for this application, providing up to 3.5A.

"Intersil's EL7585A is extremely power-efficient, creating a cooler operating system than other solutions currently in the marketplace," claims Mike Jennings, marketing director of the Display Power group. "By maximizing the level of integration, Intersil provides customers with very small footprint designs. We also go one step further by regulating the logic supply voltage to reduce display noise."

The EL7585A's PWM boost converter delivers up to 16V (for the LCD's column drivers) from a 3V to 5V input. Two LDO (low dropout) controllers provides regulation for the gate driver (Von, the positive supply for the LCD's row drivers) and display logic (Vlogic, for the backlight driver, timing controller etc.). A third LDO generates Voff, the negative supply for the row drivers. Each output is regulated to 1 percent. The EL7585A also includes integrated power supply sequencing and fully protects the display panel without the need for external components.

The EL7585A, in a 20-pin QFN lead-free package, is priced at $1.33 each in 1,000-unit quantities.

- Vince Biancomano

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