LT3645 Просмотр технического описания (PDF) - Linear Technology
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LT3645 Datasheet PDF : 24 Pages
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LT3645
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, BOOST = 15.3V, VCC2 = 3.3V, OUT2 = 1.8V unless
otherwise noted. (Notes 2, 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
FB NPG Threshold, % of Regulation Voltage
NPG Threshold Hysteresis
VFB2 = 800mV, VFB Rising
88
90
92
%
25
mV
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 specifications
from 0°C to 125°C. Specifications 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 specified 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.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency VOUT = 5V
90
Efficiency VOUT = 3.3V
90
80
80
70
70
60
50
0
VIN = 7V
VIN = 12V
VIN = 24V
100 200 300 400 500
OUTPUT CURRENT (mA)
3645 G01
Buck Minimum Input Voltage,
VOUT = 3.3V
6.5
VIN TO RUN
6.0
VIN TO START
5.5
5.0
4.5
4.0
3.5
3.0
1
10
100
OUTPUT CURRENT (mA)
1000
3645 G04
4
60
50
0
VIN = 7V
VIN = 12V
VIN = 24V
100 200 300 400 500
LOAD CURRENT (mA)
3645 G02
FB Voltage
804
803
802
801
800
799
798
797
796
795
794
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
3645 G05
Buck Minimum Input Voltage,
VOUT = 5V
8.0
VIN TO RUN
VIN TO START
7.5
7.0
6.5
6.0
5.5
5.0
1
10
100
OUTPUT CURRENT (mA)
1000
3645 G03
FB2 Voltage
800
799
798
797
796
795
794
–50
0
50
100
TEMPERATURE (°C)
150
3645 G06
3645f
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