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PDF LT3572 Data sheet ( Hoja de datos )
| Número de pieza | LT3572 | |
| Descripción | Dual Full-Bridge Piezo Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT3572 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LT3572www.DataSheet4U.com
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
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LT3572www.DataSheet4U.com
PIN FUNCTIONS
SW (Pin 1): Switch Node. This pin connects to the col-
lector of an internal NPN power switch.
VIN (Pin 2): Input Supply Pin. This pin must be locally
bypassed with a capacitor.
SYNC (Pin 3): Synchronization Pin. This pin is used to
synchronize the internal oscillator to an external signal.
The synchronizing range is 15% above the free running
frequency set by the RT pin up to 2.5MHz. If not used,
this pin must be tied to GND.
RT (Pin 4): Frequency Set Pin. Place a resistor to GND
to set the internal frequency. The range of oscillation is
500kHz to 2.25MHz.
GND (Pins 5, 9, 20): Ground.
PWMB (Pin 6): Logic Input for the Driver. A high signal
on this input sets OUTB high and OUTB low.
PWMA (Pin 7): Logic Input for the Driver. A high signal
on this input sets OUTA high and OUTA low.
VOUT (Pin 8): Output for the Switching Regulator and the
Input Supply for the Drivers.
SHDN (Pin 10): Shutdown Pin. Tie to 1.5V or more to
enable the switcher. Pull low to disable the switcher.
SHDNA (Pin 11): Shutdown Pin. Tie to 1.5V or more to
enable OUTA and OUTA. Pull low to place OUTA and OUTA
in a high impedance state.
SHDNB (Pin 12): Shutdown Pin. Tie to 1.5V or more to
enable OUTB and OUTB. Pull low to place OUTB and OUTB
in a high impedance state.
FB (Pin 13): Feedback Pin. The LT3572 regulates this pin
to 1.225V. Connect the feedback resistors to this pin to
set the output voltage for the switching regulator.
SS (Pin 14): Soft-Start Pin. Place a soft-start capacitor
here. A capacitor on the soft-start pin slowly ramps the
current limit of the part from 0A to 1.3A.
PGOOD (Pin 15): This pin is an open-drain output that
pulls low when the FB pin is within 95% of its regulation
value.
OUTB (Pin 16): The Output Driver. This node switches
between VOUT and GND and is inverted from OUTB.
OUTB (Pin 17): The Output Driver. This node switches
between VOUT and GND.
OUTA (Pin 18): The Output Driver. This node switches
between VOUT and GND .
OUTA (Pin 19): The Output Driver. This node switches
between VOUT and GND and is inverted from OUTA.
Exposed Pad (Pin 21): Ground. The Exposed Pad of the
package provides both electrical contact to ground and
good thermal contact to the printed circuit board. The
Exposed Pad must be soldered to the circuit board for
proper operation.
3572fa
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5 Page 
PACKAGE DESCRIPTION
UF Package
20-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1710 Rev A)
LT3572www.DataSheet4U.com
4.50 p 0.05
3.10 p 0.05
2.00 REF
2.45 p 0.05
2.45 p 0.05
0.70 p0.05
PACKAGE OUTLINE
0.25 p0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
4.00 p 0.10
0.75 p 0.05
R = 0.05
TYP
PIN 1
TOP MARK
(NOTE 6)
4.00 p 0.10
2.00 REF
BOTTOM VIEW—EXPOSED PAD
R = 0.115
TYP
19 20
PIN 1 NOTCH
R = 0.20 TYP
OR 0.35 s 45o
CHAMFER
0.40 p 0.10
2.45 p 0.10
1
2
2.45 p 0.10
0.200 REF
0.00 – 0.05
NOTE:
1. DRAWING IS PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220
VARIATION (WGGD-1)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
(UF20) QFN 01-07 REV A
0.25 p 0.05
0.50 BSC
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT3572.PDF ] | |
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