General Description

The Supertex HV857 is a high voltage driver designed for driving Electroluminescent (EL) lamps of up to 5 square inches. The input supply voltage range is from 1.8V to 5.0V. The device uses a single inductor and a minimum number of passive components. The nominal regulated output voltage that is applied to the EL lamp is ±95V. The chip can be enabled/disabled by connecting the resistor on Rsw-osc to VDD/ground.

Features

❏ Patent pending audible noise reduction

❏ Patent pending lamp aging compensation

❏ 190VPP output voltage for higher brightness

❏ Patented output timing for high efficiency

❏ Single cell lithium ion compatible

❏ 150nA shutdown current

❏ Wide input voltage range 1.8V to 5.0V

❏ Separately adjustable lamp and converter frequencies

❏ Output voltage regulation

❏ Split supply capability

Applications

❏ LCD backlighting

❏ Mobile cellular phones

❏ PDAs

❏ Handheld wireless communication products

❏ Global Positioning Systems (GPS)