Dual full-bridge piezo driver

19 March 2008 Power Electronics / Power Management

Linear Technology has released the LT3572, a highly integrated dual full-bridge Piezo driver, capable of driving two Piezo motors at up to 40 V. 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 stabilisation as well as auto-focus and zoom motor control for digital still and video cameras. Its 2,7 V to 10 V input voltage accommodates both single-cell and dual-cell Li-Ion powered digital cameras. The integrated 900 mA boost converter can deliver up to 50 mA of output current at 30 V from a Li-Ion input. Its switching frequency can be programmed between 500 kHz and 2,25 MHz, keeping external components very small. 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 synchronisation.

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