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

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.