Datasheet Linear Technology LT3572EUF#TRPBF

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Design Notes

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  Tiny Dual Full-Bridge Piezo Motor Driver Operates from Low Input Voltage &mdash DN436
  PDF, 116 Kb, File published: Mar 17, 2008
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  Tiny Dual Full-Bridge Piezo Motor Driver Operates from
  Low Input Voltage – Design Note 436
  Wei Gu
  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 resulting high component
  count and large board space are especially problematic
  in the design of cameras for ever shrinking cell phones.
  The LTВ®3572 solves these problems by combining a
  step-up regulator and a dual full-bridge driver in a 4mm
  Г— 4mm QFN package. Figure 1 shows a typical LT3572
  Piezo motor drive circuit. A step-up converter is used
  to generate 30V from a low voltage power source such
  as a Li-Ion battery or any input power source within the
  part’s wide input voltage range of 2.7V to 10V. The high
  output voltage of the step-up converter, adjustable up
  to 40V, is available for the drivers at the VOUT pin. The
  drivers operate in a full-bridge fashion, where the OUTA
  and OUTB pins are the same polarity as the PWMA and …

Articles

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  Small, High Efficiency Solution Drives Two Piezo Motors &mdash LT Journal
  PDF, 413 Kb, File published: Jan 14, 2008
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  L DESIGN IDEAS Small, High Efficiency Solution
  Drives Two Piezo Motors
  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 resulting high component count
  and large board space are especially
  problematic in the design of cameras
  for ever shrinking cell phones. The
  LT3572 solves these problems by
  combining a step-up regulator and
  a dual full bridge driver in a 4mm Г—
  4mm QFN package. A Simple Integrated Solution
  to Drive Two Piezo Motors Figure 1 shows a typical LT3572 Piezo
  motor drive circuit. A step-up converter
  with a high efficiency internal switch is
  used to generate 30V from a low voltage …

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Manufacturer's Classification

• Power Management > Switching Regulator > Piezo Microactuator Driver

Other Names:

LT3572EUFTRPBF, LT3572EUF TRPBF