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參數(shù)資料
| 型號： | LTC3547BIDDB#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, M0-229WECD-1, DFN-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LTC3547BIDDB#PBF |
LTC3547B
3
3547bfb
VIN (V)
2.5
100
90
80
70
60
50
40
10
20
30
45
3547b G02
3
3.5
4.5
5.5
EFFICIENCY
(%)
VOUT = 1.8V
IOUT = 0.1mA
IOUT = 1mA
IOUT = 10mA
IOUT = 100mA
IOUT = 300mA
10μs/DIV
VOUT
50mV/DIV
IL
50mA/DIV
SW,
AC-COUPLED
5V/DIV
3547b G01
VIN = 3.6V
VOUT = 1.8V
ILOAD = 1mA
TEMPERATURE (C)
–50
400
350
300
250
200
150
100
25
75
3547b G03
–25
0
50
100
SUPPL
Y
CURRENT
(μA)
ILOAD = 0A
VIN = 5.5V
VIN = 2.7V
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ΔVLINEREG
Reference Voltage Line Regulation
VIN = 2.5V to 5.5V
0.3
0.5
%/V
ΔVLOADREG
Output Voltage Load Regulation
ILOAD = 50mA to 300mA
0.5
%
IS
Input DC Supply Current
Active Mode (Note 4)
Shutdown
VFB1 = VFB2 = 0.95 × VFBREG
RUN1 = RUN2 = 0V, VIN = 5.5V
450
0.1
700
1
μA
fOSC
Oscillator Frequency
VFB = 0.6V
●
1.8
2.25
2.7
MHz
ILIM
Peak Switch Current Limit
Channel 1 (300mA)
Channel 2 (300mA)
VIN = 2.5V, VFB < VFBREG, Duty Cycle < 35%
400
550
mA
RDS(ON)
Channel 1 (Note 3)
Top Switch On-Resistance
Bottom Switch On-Resistance
Channel 2 (Note 3)
Top Switch On-Resistance
Bottom Switch On-Resistance
VIN = 3.6V, ISW = 100mA
0.8
0.75
0.8
0.75
1.05
Ω
ISW(LKG)
Switch Leakage Current
VIN = 5V, VRUN = 0V
0.01
1
μA
tSOFTSTART
Soft-Start Time
VFB From 10% to 90% Full-Scale
0.450
0.650
0.850
ms
VRUN
RUN Threshold High
●
0.4
1
1.2
V
IRUN
RUN Leakage Current
●
0.01
1
μA
The ● denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. VCC = 3.6V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3547BE is guaranteed to meet specied performance
from 0°C to 85°C. Specications over the –40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3547BI is guaranteed over the
–40°C to 125°C operating temperature range.
Note 3: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: Guaranteed by long-term current density limitations.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specied maximum operating junction
temperature may impair device reliability.
Pulse Skip Mode Operation
Efciency vs Input Voltage
Supply Current vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TA = 25°C unless otherwise specied.
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