3509 Ver la hoja de datos (PDF) - Linear Technology
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3509 Datasheet PDF : 24 Pages
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LT3509
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V. (Note 3)
PARAMETER
VIN Undervoltage Lockout
VIN Overvoltage Lockout
Input Quiescent Current
Input Shutdown Current
Feedback Pin Voltage
Reference Voltage Line Regulation
RUN/SS Shutdown Threshold
RUN/SS Voltage for Full IOUT
RUN/SS Pin Pull-up Current
Feedback Pin Bias Current (Note 4)
Switch Current Limit
DA Comparator Current Threshold
Boost Pin Current
Switch Leakage Current
Switch Saturation Voltage
Minumum Boost Voltage above Switch
Boost Diode Forward Voltage
Boost Diode Leakage
Switching Frequency
Sync Pin Input Threshold
Switch Minimum Off-Time
CONDITIONS
Not Switching VFB > 0.8V
V(RUN/SS[1,2]) < 0.3V
3.6V < VIN < 36V
VFB = 0.8V
ISW = 0.9A
ISW = 0.9A (Note 5)
ISW = 0.9A
IBD= 20mA
VR = 30V
RT = 40.2kΩ
RT = 180kΩ
RT = 14.1kΩ
MIN
TYP
MAX
3.3
3.6
37
38.5
40
1.9
2.2
9
15
l 0.784
0.8
0.816
0.01
0.4
0.6
0.8
2
0.7
1
1.3
l
90
500
l 1.05
1.4
1.9
0.7
0.95
1.2
22
36
0.01
1.0
0.32
1.5
2.2
0.7
0.9
0.1
5
l 0.92
1.0
1.08
237
260
290
2.0
2.15
2.5
1.0
l
80
150
UNITS
V
V
mA
μA
V
%/V
V
V
μA
nA
A
A
mA
μA
V
V
V
μA
MHz
kHz
MHz
V
ns
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. Absolute Maximum Voltage at the VIN pin is 60V for non-repetitive
1 second transients and 36V for continuous operation.
Note 3. The LT3509E 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 LT3509I is guaranteed
over the full –40°C to 125°C temperature range. The LT3509H 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.
Note 4. Current flows out of pin.
Note 5. Switch Saturation Voltage is guaranteed by design.
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 temperature when overtemperature protection
is active. Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
3509fc
3
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