LT3572

LT3572 Dual Full-Bridge Piezo Driver with 900mA Boost Converter www.DataSheet4U.com FEATURES ■ ■ ■ ■ 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. ■ ■ ■ ■ 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 TYPICAL APPLICATION Dual Piezo Driver VIN 3V TO 5V 10μH VOUT 30V 50mA SW VOUT FB OUTA LT3572 OUTA 3572 TA01a Response Driving Piezo Motor at 70kHz 100k 4.7μF VIN SHDN SHDNA SHDNB PWMA PWMB SYNC PGOOD RT 15pF 576k 10μF 24.3k VOUTA 20V/DIV VOUTA 20V/DIV OUTB GND OUTB 42.2k SS...