HV892

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground.

The HV892 liquid lens driver is controlled via an I²C interface, is capable of driving capacitive loads of up to 200pF, and is compatible with 40V_RMS to 60V_RMS lenses.

A single byte (AMP) written to the HV892 controls the operation of the driver. Setting AMP = 01h to FFh controls output amplitude in 255 monotonic steps. Setting AMP = 00h causes it to go into low power standby mode, consuming less than 1.0A. When active, it draws less than 20mA.

A charge pump boost converter integrated on-chip HV892 provides the high voltage necessary for driving the lens. No external inductors or diodes are needed. Two ceramic chip capacitors are the only external components required for a complete lens driver circuit. An H-bridge output stage provides AC drive to the lens, allowing the use of a single high voltage boost converter while providing alternating polarity to the lens. Controlled rising and falling edges on the drive waveform reduces EMI.

The HV892 is offered in a 10-Lead 4x4mm DFN package.