Tiny dual full-bridge Piezo motor driver operates from low input voltage
Wei Gu
Abstract
The LT3572 Piezo motor driver is described. It combines a step-up regulator and a dual full-bridge driver in a tiny 4mm 4mm package, making it suitable for cameras in ever-shrinking cell phones.
Keywords
LT3572
Piezoelectric motor driver
Piezo motor driver
Introduction
Piezoelectric motors are used in digital cameras for autofocus, zooming and optical image stabilization. They are relatively small, lightweight and efficient, but they also require a complicated driving scheme. Traditionally, this challenge has been met with the use of separate circuits, including a step-up converter and an oversized generic full-bridge drive IC. The ...
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