Supertex inc. HV892 Inductorless Liquid Lens Driver General Description Features 2 The HV892 liquid lens driver is controlled via an I C interface, Drives capacitive loads up to 200pF is capable of driving capacitive loads of up to 200pF, and is Programmable drive amplitude compatible with 40V to 60V lenses. RMS RMS (compatible with 40V to 60V lenses) RMS RMS On-chip boost converter A single byte (AMP) written to the HV892 controls the operation No external inductor of the driver. Setting AMP = 01h to FFh controls output amplitude 2 I C interface in 255 monotonic steps. Setting AMP = 00h causes the HV892 Low operating current (20mA) to go into low power standby mode, consuming less than 1.0A. Low standby current (1.0A) When active, the HV892 draws less than 20mA. Controlled drive edge reduces EMI 10-Lead 4x4mm DFN Package A charge pump boost converter integrated on-chip provides the high voltage necessary for driving the lens. No external inductors Applications or diodes are needed. Two ceramic chip capacitors are the only external components required for a complete lens driver circuit. Cell phone cameras PDA and ultracompact cameras An H-bridge output stage provides AC drive to the lens, allowing Bar code readers the use of a single high voltage boost converter while providing Web and laptop cameras 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. Typical Application Circuit 2 V I C bus IN VIN HV 2.65 - 5.5V C HV C IN 4.7nF 100V 2.2F 6.3V HV892 SDA OUT1 Liquid Lens SCL 100 - 200pF V DD VDD OUT2 1.7 - 2.95V GND1 GND2 Doc. DSFP-HV892 Supertex inc. A042314 www.supertex.comHV892 Pin Configuration Ordering Information Part Number Package Option Packing GND1 1 10 HV HV892K7-G 10-Lead DFN (4x4) 3000/Reel -G indicates package is RoHS compliant (Green) VIN 2 9 NC SCL 3 8 OUT1 4 SDA 7 OUT2 VDD 5 6 GND2 ESD Sensitive Device Absolute Maximum Ratings 10-Lead DFN (top view) Parameter Value Note: Pads are at the bottom of the package. Center heat slug is at ground potential V , V -0.5V to +6.5V IN DD SDA, SCL -0.5V to +6.5V Product Marking Operating temperature -40C to +85C Storage temperature -65C to +150C Y = Last Digit of Year Sealed H892 Absolute Maximum Ratings are those values beyond which damage to the device may W = Code for Week Sealed occur. Functional operation under these conditions is not implied. Continuous operation YWLL L = Lot Number of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. = Green Packaging Package may or may not include the following marks: Si or Typical Thermal Resistance 10-Lead DFN Package R ja O 10-Lead DFN (4x4) 44 C/W Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions V Supply voltage 2.65 - 5.50 V --- IN 2 V I C logic level reference 1.70 - 2.95 V --- DD 1 t Time for V to ramp to 90% - - 2.0 ms --- VIN IN C Supply bypass capacitor - 2.2 - F --- IN C High voltage storage capacitor 24 - - x C 100V rating HV LOAD C Load (lens) capacitance 100 150 200 pF --- LOAD 2 f I C clock - - 400 kHz --- SCL O T Ambient temperature -25 - +85 C --- A Notes: 1. To assure the driver powers up in standby state. No damage will occur if ramped up slower. O Electrical Specifications (Over recommended operating conditions T = 25 C unless otherwise specified) A Sym Parameter Min Typ Max Units Conditions - - 500 nA AMP = 00h, SDA = V , SCL = V DD DD I V supply current IN IN - 8.0 20 mA AMP = FFh, SDA = V , SCL = V DD DD - - 500 nA AMP = 00h, SDA = V , SCL = V DD DD I V supply current DD DD - 9.0 12 A AMP = FFh, SDA = V , SCL = V DD DD Output voltage of internal boost HV 71 75 79 V C = 0pF LOAD converter Doc. DSFP-HV892 Supertex inc. A042314 2 www.supertex.com