LT3572 查看數據表（PDF） - Linear Technology

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LT3572

Dual Full-Bridge Piezo Driver with 900mA Boost Converter

Linear Technology 

LT3572

Dual Full-Bridge Piezo Driver

with 900mA Boost Converter

FEATURES

■ 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

APPLICATIONS

■ Piezo Motor Drive

DESCRIPTION

The LT®3572 is a highly integrated dual Piezo motor driver

capable of driving two Piezo motors at up to 40V from a

5V supply. Each Piezo driver can be independently turned

on or off along with the boost converter.

The boost regulator has a soft-start capability that limits the

inrush current at start-up. The boost regulator switching

frequency is set by an external resistor or the frequency can

be synchronized by an external clock. A PGOOD pin indicates

when the output of the boost converter is in regulation and

the Piezo drivers are allowed to start switching.

The LT3572 is available in a (4mm × 4mm) 20-pin QFN

package.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

VIN

3V TO 5V

Dual Piezo Driver

10μH

100k

4.7μF

VIN

SHDN

SHDNA

SHDNB

PWMA

PWMB

SYNC

PGOOD

SW

LT3572

VOUT

FB

OUTA

OUTA

RT

OUTB

42.2k

SS

10nF

OUTB

GND

15pF 576k

VOUT

30V

50mA

10μF

24.3k

3572 TA01a

Response Driving Piezo Motor at 70kHz

VOUTA

20V/DIV

VOUTA

20V/DIV

PWMA

2V/DIV

2μs/DIV

3572 TA01b

3572fa

1

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