LT3973IMSE-3.3-TRPBF 查看數據表（PDF） - Linear Technology
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LT3973IMSE-3.3-TRPBF
Linear Technology
LT3973IMSE-3.3-TRPBF Datasheet PDF : 24 Pages
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LT3973/LT3973-3.3/LT3973-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)
EN/UVLO Pin Current
EN/UVLO Voltage Threshold
EN/UVLO Voltage Threshold
EN/UVLO Voltage Hysteresis
VEN/UVLO = 12V
EN/UVLO Falling, VIN ≥ 4.2V
EN/UVLO Rising, VIN ≥ 4.2V
1
30
nA
l 1.09
1.16
1.23
V
l 1.12
1.19
1.28
V
30
45
mV
PG Threshold Offset from Feedback Voltage
PG Hysteresis as % of Output Voltage
VFB Rising
6.5
10
13.5
%
0.8
%
PG Leakage
PG Sink Current
Minimum Switch On-Time
VPG = 3V
VPG = 0.4V
0.01
1
µA
l 220
350
µA
70
ns
Minimum Switch Off-Time (Note 5)
VIN = 10V
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 LT3973E is guaranteed to meet performance specifications
from 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
LT3973I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3973H 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 junction temperature (TJ, in °C) is
calculated from the ambient temperature (TA in °C) and power dissipation
(PD, in Watts) according to the formula:
130
180
ns
Note 3: This is the minimum input voltage for operation with accurate FB
reference voltage.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: The LT3973 contains circuitry that extends the maximum duty
cycle if there is sufficient voltage across the boost capacitor. See the
Application Information section for more details.
Note 6: This IC 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 or permanently damage the device.
TJ = TA + (PD • θJA)
where θJA (in °C/W) is the package thermal impedance.
3973fb
4
For more information www.linear.com/LT3973
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