LT3757(RevB) Просмотр технического описания (PDF) - Linear Technology
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LT3757 Datasheet PDF : 36 Pages
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LT3757
Electrical Characteristics The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.
PARAMETER
INTVCC Current in Shutdown
INTVCC Voltage to Bypass Internal LDO
Logic Inputs
CONDITIONS
SHDN/UVLO = 0V, INTVCC = 8V
MIN TYP MAX UNITS
16
µA
7.5
V
SHDN/UVLO Threshold Voltage Falling
SHDN/UVLO Input Low Voltage
SHDN/UVLO Pin Bias Current Low
VIN = INTVCC = 8V
I(VIN) Drops Below 1µA
SHDN/UVLO = 1.15V
l 1.17 1.22 1.27
V
0.4
V
1.7
2
2.5
µA
SHDN/UVLO Pin Bias Current High
SHDN/UVLO = 1.30V
10
100
nA
Gate Driver
tr Gate Driver Output Rise Time
tf Gate Driver Output Fall Time
Gate VOL
Gate VOH
CL = 3300pF (Note 5), INTVCC = 7.5V
CL = 3300pF (Note 5), INTVCC = 7.5V
22
ns
20
ns
0.05
V
INTVCC
V
– 0.05
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 LT3757E is guaranteed to meet performance specifications
from the 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3757I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3757H is guaranteed over the full –40°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetimes. Operating lifetime is derated at junction temperatures
greater than 125°C. The LT3757MP is 100% tested and guaranteed over the
full –55°C to 125°C operating junction temperature range.
Note 3: The LT3757 is tested in a feedback loop which servos VFBX to the
reference voltages (1.6V and –0.8V) with the VC pin forced to 1.3V.
Note 4: FBX overvoltage lockout is measured at VFBX(OVERVOLTAGE) relative
to regulated VFBX(REG).
Note 5: Rise and fall times are measured at 10% and 90% levels.
Note 6: For VIN below 6V, the SHDN/UVLO pin must not exceed VIN.
Note 7: SHDN/UVLO = 1.33V when VIN = 2.9V.
Note 8: The LT3757 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability.
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Positive Feedback Voltage
vs Temperature, VIN
1605
1600
VIN = 40V
VIN = 24V
1595
1590
1585
VIN = 8V
VIN = INTVCC = 2.9V
SHDN/UVLO = 1.33V
1580
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3757 G01
Negative Feedback Voltage
vs Temperature, VIN
–788
–790
–792
VIN = INTVCC = 2.9V
SHDN/UVLO = 1.33V
–794
–796
VIN = 8V
–798
–800
–802
VIN = 24V
VIN = 40V
–804
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3757 G02
Quiescent Current
vs Temperature, VIN
1.8
1.7
VIN = 40V
VIN = 24V
1.6
1.5
VIN = INTVCC = 2.9V
1.4
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3757 G03
3757fb
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