LT3572 Dual Full-Bridge Piezo Driver with 900mA Boost Converter FEATURES DESCRIPTION 2.7V to 10V Input Voltage Range The LT 3572 is a highly integrated dual Piezo motor driver 900mA Boost Converter capable of driving two Piezo motors at up to 40V from a Dual Full-Bridge Piezo Drivers 5V supply. Each Piezo driver can be independently turned Programmable Switching Frequency from on or off along with the boost converter. 500kHz to 2.25MHz The boost regulator has a soft-start capability that limits the Synchronizable Up to 2.5MHz inrush current at start-up. The boost regulator switching Soft-Start frequency is set by an external resistor or the frequency can Separate Enable for Each Piezo Driver and Boost be synchronized by an external clock. A PGOOD pin indicates Converter when the output of the boost converter is in regulation and Available in a 4mm 4mm 20-Pin QFN Package the Piezo drivers are allowed to start switching. The LT3572 is available in a (4mm 4mm) 20-pin QFN APPLICATIONS package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Piezo Motor Drive All other trademarks are the property of their respective owners. TYPICAL APPLICATION Dual Piezo Driver 10H V OUT V IN Response Driving Piezo Motor at 70kHz 30V 3V TO 5V 50mA 15pF 576k V SW V IN OUT SHDN 10F 100k SHDNA FB V OUTA SHDNB 24.3k 20V/DIV PWMA OUTA LT3572 PWMB V OUTA 4.7F OUTA SYNC 3572 TA01a 20V/DIV PGOOD RT OUTB PWMA 2V/DIV OUTB SS 42.2k GND 3572 TA01b 10nF 2s/DIV 3572fa 1LT3572 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V Voltage .............................................................40V TOP VIEW OUT OUTA, OUTA, OUTB, OUTB Voltage ...........................40V SW Voltage ...............................................................42V 20 19 18 17 16 RT, SS, SYNC ..............................................................2V PGOOD SW 1 15 FB ............................................................................... 3V V 2 14 SS IN All Other Pins ............................................................10V SYNC 3 21 13 FB Maximum Junction Temperature........................... 125C RT 4 12 SHDNB Operating Temperature Range (Note 2).... 40C to 85C GND 11 SHDNA 5 Storage Temperature Range ................... 65C to 125C 6 7 8 9 10 UF PACKAGE 20-LEAD (4mm s 4mm) PLASTIC QFN T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3572EUF PBF LT3572EUF TRPBF 3572 20-Lead (4mm 4mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: