General Description
The Supertex HV857L is a low noise, high voltage driver designed for driving Electroluminescent (EL) lamps of up to fi ve square inches. It is the low noise version of the EL lamp driver HV857. 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
► Audible noise reduction
► 190 VPP output voltage for higher brightness
► 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
► Available in DFN-8 and MSOP-8 packages

Applications
► Mobile cellular phones
► Keypad backlighting
► LCD backlighting
► PDAs
► Handheld wireless communication products
► Global Positioning Systems (GPS)