LT3572_15 Datasheet, PDF (1/12 Pages) Linear Technology – Dual Full-Bridge Piezo Driver with 900mA Boost Converter

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
V_IN
3V TO 5V
Dual Piezo Driver
10μH
100k
4.7μF
V_IN
SHDN
SHDNA
SHDNB
PWMA
PWMB
SYNC
PGOOD
SW
LT3572
V_OUT
FB
OUTA
OUTA
RT
OUTB
42.2k
SS
10nF
OUTB
GND
15pF 576k
V_OUT
30V
50mA
10μF
24.3k
3572 TA01a
Response Driving Piezo Motor at 70kHz
V_OUTA
20V/DIV
V_OUTA
20V/DIV
PWMA
2V/DIV
2μs/DIV
3572 TA01b
3572fa
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