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4mm x 4mm Dual Full-Bridge Piezo Driver Generates Its Own High Voltage

MILPITAS, CA - February 20, 2008 - Linear Technology Corporation announces the LT3572, a highly integrated dual full-bridge Piezo driver, capable of driving two Piezo motors at up to 40V. Each Piezo driver and the boost converter can be independently turned on or off. This design topology makes the LT3572 ideal for dual axis image stabilization as well as auto focus and zoom motor control for digital still and video cameras. Its 2.7V to 10V input voltage accommodates both single-cell and dual-cell Li-Ion powered digital cameras.

The LT3572's integrated 900mA boost converter can deliver up to 50mA of output current at 30V from a Li-Ion input. Its switching frequency can be programmed between 500kHz and 2.25MHz, keeping externals very small. Offered in a 4mm x 4mm QFN package, it provides a very compact solution footprint. A PGOOD pin indicates when the output of the boost converter is in regulation, allowing the Piezo drivers to start switching. Other features include soft-start and external synchronization.

The LT3572EUF is available from stock in a 20-lead QFN package. 1,000-piece pricing starts at $2.75 each.

Summary of Features: LT3572 •  2.7V to 10V Input Voltage Range •  900mA Boost Converter •  Dual Full-Bridge Piezo Drivers •  Programmable Switching Frequency from 500kHz to 2.25MHz •  Synchronizable Up to 2.5MHz •  Soft-Start •  Separate Enable for Each Piezo Driver and Boost Converter •  Available in a 4mm × 4mm 20-Pin QFN Package

2.7 to 10V Input Voltage Range 900mA Boost Converter Click Photo for High-Res Image