LT3645
4
3645f
Buck Minimum Input Voltage,
V
OUT
= 3.3V
Ef ciency V
OUT
= 5V
Ef ciency V
OUT
= 3.3V
Buck Minimum Input Voltage,
V
OUT
= 5V
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
FB NPG Threshold, % of Regulation Voltage
V
FB2
= 800mV, V
FB
Rising
88 90 92
%
NPG Threshold Hysteresis
25
mV
ELECTRICAL CHARACTERISTICS
The l denotes the speci cations which apply over the full operating
temperature range, otherwise speci cations are at T
A
= 25癈. V
IN
= 12V, BOOST = 15.3V, V
CC2
= 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 speci cations
from 0癈 to 125癈. Speci cations over the 40癈 to 125癈 operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3645I is guaranteed over the full
40癈 to 125癈 operating temperature range. The LT3645H is guaranteed
over the full 40癈 to 150癈 operating temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125癈.
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 speci ed 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 V
IN
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
60
70
80
90
100 200 300
3645 G01
400 500
V
IN
= 7V
V
IN
= 12V
V
IN
= 24V
LOAD CURRENT (mA)
0
50
60
70
80
90
100 200 300
3645 G02
400 500
V
IN
= 7V
V
IN
= 12V
V
IN
= 24V
OUTPUT CURRENT (mA)
1
5.0
5.5
6.5
6.0
7.5
7.0
8.0
10
100
3645 G03
1000
V
IN
TO RUN
V
IN
TO START
TEMPERATURE (癈)
50 3010
794
796
799
798
797
795
800
801
802
803
804
10 30 50 70 90 130
3645 G05
110 150
FB Voltage
TEMPERATURE (癈)
50
0
794
795
797
796
798
799
800
50
3645 G06
100 150
OUTPUT CURRENT (mA)
1
3.0
4.0
3.5
5.0
4.5
6.0
5.5
6.5
10
100
3645 G04
1000
V
IN
TO RUN
V
IN
TO START
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