Electronic Design

Dimmable Lamp Driver Powers Two Separate EL Keypads

Cellular phones that have two separate keypads can now be driven independently with one IC. The HV862 from Supertex Inc. is a dimmable, low-noise, dual electroluminescent lamp driver designed to backlight keypads in cellular phones, portable instrumentation, and other handheld devices. The device features independent input controls for lamp selection, a 180-V pk-pk output voltage for high brightness, and adjustable output-voltage regulation for dimming capability. It requires a single inductor and a minimum number of passive components.

The HV862 comes in a 3- by 3-mm QFN-16 package (HV862K7-G), which is RoHS-compliant. Samples are available from stock. Lead time for production quantities is four to six weeks. The HV862K7-G costs $1.25 each in quantities of 1000. To learn more, checkout www.supertex.com.

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