LT3572

1

3572fa

FEATURES

APPLICATIONS

DESCRIPTION

Dual Full-Bridge Piezo Driver

with 900mA Boost Converter

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

besynchronizedbyanexternalclock.APGOODpinindicates

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.

Dual Piezo Driver

■

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

■

Piezo Motor Drive

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

All other trademarks are the property of their respective owners.

SHDN

SHDNA

SHDNB

PWMA

PWMB

SYNC

PGOOD

RT

SS

3V TO 5V

SW

10μH

GND

LT3572

10nF

4.7μF

15pF

10μF

30V

50mA

100k

576k

24.3k

3572 TA01a

FB

OUTA

OUTA

OUTB

OUTB

42.2k

Response Driving Piezo Motor at 70kHz

20V/DIV

20V/DIV

PWMA

2V/DIV

2μs/DIV

3572 TA01b

TYPICAL APPLICATION