LT3757 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3757 Datasheet PDF : 36 Pages
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LT3757/LT3757A
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 Voltage to Bypass Internal LDO
Logic Inputs
CONDITIONS
MIN
TYP MAX UNITS
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 –0.05
V
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/LT3757AE are 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/LT3757AI are guaranteed over the full –40°C to
125°C operating junction temperature range. The LT3757H/LT3757AH are
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/LT3757AMP are 100% tested and guaranteed over the full
–55°C to 150°C operating junction temperature range.
Note 3: The LT3757/LT3757A are 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/LT3757A include 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
4
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
3757afd
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