观察日记300字植物
FEATURES
APPLICATIONS
DESCRIPTION
with 900mA Boost Converter
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 t 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.
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
豆干的做法大全家常
■
Piezo Motor Drive
妈妈的英文单词
V OUT Respon Driving Piezo Motor at 70kHz
V OUTA 20V/DIV V OUTA 20V/DIV
PWMA 2V/DIV
2μs/DIV
3572 TA01b
T YPICAL APPLICATION
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V OUT Voltage .............................................................40V OUTA, OUTA , OUTB, OUTB Voltage ...........................40V SW Voltage ...............................................................42V RT, SS, SYNC ..............................................................2V FB ...............................................................................3V All Other Pins ............................................................10V Maximum
........125°C Operating Temperature Range (Note 2)....–40°C to 85°C Storage Temperature Range ...................–65°C to 125°C
(Note 1)
2019181716
678TOP VIEW 21
UF PACKAGE
20-LEAD (4mm s 4mm) PLASTIC QFN
9105
唐山大地震影评43211112131415SW V IN SYNC RT GND PGOOD SS
FB SHDNB SHDNA
G N D
O U T A
O U T A
O U T B
O U T B
P W M B
P W M A
V O U T
G N D
S H D N
T JMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage ●
2.5 2.7V V IN Quiescent Current V FB = 1.3V
3.44mA V IN Shutdown Current V SHDN = V SHDNA = V SHDNB = 0V
1μA SHDN Pin Threshold 0.3 1.5V SHDNA Pin Threshold 0.3 1.5V SHDNB Pin Threshold 0.3
1.5V SHDN Pin Bias Current V SHDN = 5V, V SHDNA = 0V, V SHDNB = 0V
V SHDN = 0V, V SHDNA = 0V, V SHDNB = 0V 80.1151μA μA SHDNA Pin Bias Current V SHDN = 0V, V SHDNA = 5V, V SHDNB = 0V V SHDN = 0V, V SHDNA = 0V, V SHDNB = 0V 80.1151μA μA SHDNB Pin Bias Current
V SHDN = 0V, V SHDNA = 0V, V SHDNB = 5V V SHDN = 0V, V SHDNA = 0V, V SHDNB = 0V 80.1
151
μA μA
The ● denotes the specifi cations which apply over the full operating temperature range, otherwi specifi cations are at T A = 25°C. V IN = 5V, V SHDNA = V SHDNB = V SHDN = 5V, unless otherwi noted.
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION
TEMPERATURE RANGE LT3572EUF#PBF
LT3572EUF#TRPBF
3572
20-Lead (4mm × 4mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.Consult LTC Marketing for information on non-standard lead bad fi nish parts.
For more information on lead free part marking, go to: /leadfree/ For more information on tape and reel specifi cations, go to: /tapeandreel/
Note 1: Stress beyond tho listed under Absolute Maximum Ratings may cau permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The LT3572 is guaranteed to meet specifi ed performance from 0°C to 70°C operating junction temperature. Specifi cations over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls.
ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating
temperature range, otherwi specifi cations are at T A = 25°C. V IN = 5V, V SHDNA = V SHDNB =
V SHDN = 5V, unless otherwi noted.
PARAMETER CONDITIONS
MIN TYP MAX UNITS
PWMA Pin Threshold 0.3 1.5V PWMB Pin Threshold 0.3
1.5
V PGOOD Rising Threshold (Note 3)● 1.12 1.16 1.19V PGOOD Falling Threshold (Note 4)● 1.01 1.04 1.065V PGOOD Resistance ●13k ΩSwitching Frequency RT = 75.0k Ω
RT = 13.0k Ω●●4251.95002.25
5752.6
kHz MHz Maximum Duty Cycle RT = 75.0k ΩRT = 13.0k Ω●●
9585%%
Synchronization Frequency 5752500kHz SYNC Pin Thresholds (Note 5)
0.3
1.5
V SS Current 4.5μA FB Pin Voltage
● 1.195
1.225 1.255V FB Pin Voltage Line Regulation V IN =
2.5V to 10V 0.010.05%/V FB Pin Bias Current V FB = 1.225V (Note 6)50
200nA SW Current Limit (Note 7)0.9
1.3 1.7A SW V CESAT
I SW = 800mA 310450mV SW Leakage Current SW = 40V
0.2
5μA OUTx Ri Time C = 2.2nF, V OUT = 30V (Note 8)120ns OUTx Fall Time
C = 2.2nF, V OUT = 30V (Note 8)
120
ns
Note 3: Rising threshold voltage on FB pin that pulls PGOOD low.
Note 4: Falling threshold voltage on FB pin that caus a high impedance on PGOOD .
Note 5: Minimum pul width is 100ns. Maximum off pul width is 100ns.Note 6: Current fl ows into the pin.
Note 7: Current limit guaranteed by design and/or correlation to static test.Note 8: OUTx refers to OUTA, OUTA , OUTB, OUTB .
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Pin Voltage vs Temperature
Oscillator Frequency vs Temperature
SS Pin Current vs Temperature
都的多音字组词
Quiescent Current vs Temperature
SHDN Pin Current vs Temperature
SW Current Limit vs Temperature
SW Saturation Voltage vs Temperature
Start-Up
TEMPERATURE (°C)
–50F E E D B A C K V O L T A G E (V )
1.23
1.241.25
25751503572 G01
1.221.211.20
–25
50100
125TEMPERATURE (°C)
–50F R E Q U E N C Y (M H z )
1.5
2.0
2.5
25751503572 G02
1.0
0.5
–25
50100125
TEMPERATURE (°C)
–50S S P I N C U R R E N T (μA )
461503572 G03
20
50100–25
25751258351
7
TEMPERATURE (°C)
–50Q U I E S C E N T C U R R E N T (m A )
2.03.01503572 G04
1.00
50100–25
25751254.01.52.50.5
3.5TEMPERATURE (°C)
–500
S H D N P I N C U R R E N T (μA )
13451070
50753572 G05
28
96–25
25100125150
TEMPERATURE (°C)
–50P E A K C U R R E N T (A )
0.81.21503572 G06
0.40
50100–25
2575
1251.60.61.00.21.4TEMPERATURE (°C)
–500
S W I T C H S A T U R A T I O N V O L T A G E (V )
0.050.150.200.250.500.350
50753572 G07
0.100.400.450.30–25
25100125
150
I IN
200mA/DIV
V OUT 20V/DIV V OUTA 20V/DIV
PGOOD 5V/DIV
200μs/DIV上臂肌肉
3572 G08
PIN FUNCTIONS
SW (Pin 1): Switch Node. This pin connects to the col-lector of an internal NPN power switch.
V IN (Pin 2): Input Supply Pin. This pin must be locally bypasd with a capacitor.
SYNC (Pin 3): Synchronization Pin. This pin is ud to synchronize the internal oscillator to an external signal. The synchronizing range is 15% above the free running frequency t by the RT pin up to 2.5MHz. If not ud, this pin must be tied to GND.
女诗人RT (Pin 4): Frequency Set Pin. Place a resistor to GND to t 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 ts OUTB high and OUTB low.
PWMA (Pin 7): Logic Input for the Driver. A high signal on this input ts OUTA high and OUTA low.
V OUT (Pin 8): Output for the Switching Regulator and the Input Supply for the Drivers.
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SHDN (Pin 10): Shutdown Pin. Tie to 1.5V or more to enable the switcher. Pull low to disable the swi
tcher. 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 t 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 V OUT and GND and is inverted from OUTB. OUTB (Pin 17): The Output Driver. This node switches between V OUT and GND.
OUTA (Pin 18): The Output Driver. This node switches between V OUT and GND .
OUTA (Pin 19): The Output Driver. This node switches between V OUT and GND and is inverted from OUTA. Expod Pad (Pin 21): Ground. The Expod Pad of the package provides both electric
al contact to ground and good thermal contact to the printed circuit board. The Expod Pad must be soldered to the circuit board for proper operation.
BLOCK DIAGRAM
Figure 1. Block Diagram
