Opto-Electronics


Inductorless liquid lens driver

6 August 2008 Opto-Electronics

Supertex has introduced the HV892, a liquid lens driver in an assembly-ready DFN package that is capable of driving capacitive loads up to 200 pF and is compatible with 40 to 60 VRMS lenses. Supertex’ patented charge pump technology is integrated in the device and eliminates the need for the space-consuming components found in inductor-based driver circuits. The HV892 features an I²C interface that allows for easy system design, while fast startup and response times ensure minimal shutter lag. Monotonicity is guaranteed, eliminating false ‘best-focus’ situations. Its H-bridge output stage provides AC drive to the lens, allowing the use of a single integrated high voltage boost converter while providing alternating polarity to the lens. The HV892 draws less than 20 mA when active and less than 1 μA in standby mode, prolonging battery life.



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