General Description

The Supertex HV839 is a high voltage driver designed for driving two EL lamps with a combined area of 3.5in2. The input supply voltage range is from 2.0 to 5.8V. The device is designed to reduce the amount of audible noise emitted by the lamp. This device uses a single inductor and minimum number of passive components to drive two EL lamps. The nominal regulated output voltage of ±90V is applied to the EL lamps. The two EL lamps can be turned ON and OFF by the two logic input control pins, C1 and C2. The device is disabled when both C1 and C2 (pins 1 and 4) are at logic low.

Features

► Independent input control for lamp selection

► Split supply capability

► Patented output timing

► One miniature inductor to power both lamps

► Low shutdown current

► Wide input voltage range 2.0 to 5.8V

► Output voltage regulation

► No SCR output

► Available in small packages (10-lead MSOP and 10-lead DFN)

Applications

► Mobile cellular phones, dual display

► Keypad and LCD backlighting

► Portable instrumentation

► Dual segment lamps

► Hand held wireless communication devices