Supertex inc.

Supertex inc.

www.supertex.com

HV892

Doc.# DSFP-HV892

A042314

Features

(compatible with 40V

Applications

Typical Application Circuit

Inductorless

Liquid Lens Driver

General Description

is capable of driving capacitive loads of up to 200pF, and is

compatible with 40V

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 the HV892

to go into low power standby mode, consuming less than 1.0µA.

When active, the HV892 draws less than 20mA.

A charge pump boost converter integrated on-chip 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.

VDD

SDA

SCL

GND1

VIN

HV

OUT1

OUT2

HV892

GND2

C

HV

4.7nF 100V

V

DD

1.7 - 2.95V

V

IN

2.65 - 5.5V

C

IN

2.2F 6.3V

Liquid Lens

100 - 200pF