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參數(shù)資料
| 型號： | LT3645IUD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.25 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 296K |
| 代理商： | LT3645IUD#PBF |
LT3645
4
3645f
Buck Minimum Input Voltage,
VOUT = 3.3V
Efciency VOUT = 5V
Efciency VOUT = 3.3V
Buck Minimum Input Voltage,
VOUT = 5V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FB NPG Threshold, % of Regulation Voltage
VFB2 = 800mV, VFB Rising
88
90
92
%
NPG Threshold Hysteresis
25
mV
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. VIN = 12V, BOOST = 15.3V, VCC2 = 3.3V, OUT2 = 1.8V unless
otherwise noted. (Notes 2, 3)
Note1: 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 LT3645E is guaranteed to meet performance specications
from 0°C to 125°C. Specications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3645I is guaranteed over the full
–40°C to 125°C operating temperature range. The LT3645H is guaranteed
over the full –40°C to 150°C operating temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum junction operating temperature
when overtemperature protection is active. Continuous operation above
the specied maximum operating junction temperature may result in
device degradation or failure.
Note 4: Current Measurements are performed when the outputs are not
switching. Slope compensation reduces current limit at high duty cycles.
Note 5: Absolute Maximum Voltage at VIN and EN/UVLO pins is 55V for
nonrepetitive one second transients, and 36V for continuous operation.
FB2 Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT CURRENT (mA)
0
50
EFFICIENCY
(%)
60
70
80
90
100
200
300
3645 G01
400
500
VIN = 7V
VIN = 12V
VIN = 24V
LOAD CURRENT (mA)
0
50
EFFICIENCY
(%)
60
70
80
90
100
200
300
3645 G02
400
500
VIN = 7V
VIN = 12V
VIN = 24V
OUTPUT CURRENT (mA)
1
5.0
INPUT
VOLTAGE
(V)
5.5
6.5
6.0
7.5
7.0
8.0
10
100
3645 G03
1000
VIN TO RUN
VIN TO START
TEMPERATURE (°C)
–50 –30 –10
794
FB
VOLTAGE
(mV)
796
799
798
797
795
800
801
802
803
804
10 30 50 70 90
130
3645 G05
110
150
FB Voltage
TEMPERATURE (°C)
–50
0
794
FB
VOLTAGE
(mV)
795
797
796
798
799
800
50
3645 G06
100
150
OUTPUT CURRENT (mA)
1
3.0
INPUT
VOLTAGE
(V)
4.0
3.5
5.0
4.5
6.0
5.5
6.5
10
100
3645 G04
1000
VIN TO RUN
VIN TO START
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