LT3581
4
3581fb
For more information www.linear.com/LT3581
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 LT3581E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3581I is guaranteed over the full
–40°C to 125°C operating junction temperature range. The LT3581H is
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN
, V
FAULT
= V
IN
, unless otherwise noted. (Note 2).
PARAMETER CONDITIONS MIN TYP MAX UNITS
Soft-Start Charge Current V
SS
= 30mV, Current Flows Out of SS pin
l
5.7 8.7 11.3 µA
Soft-Start Discharge Current Part in FAULT, V
SS
= 2.1V, Current Flows into SS Pin
l
5.7 8.7 11.3 µA
Soft-Start High Detection Voltage Part in FAULT
l
1.65 1.8 1.95 V
Soft-Start Low Detection Voltage Part Exiting FAULT
l
30 50 85 mV
SHDN Minimum Input Voltage High Active Mode, SHDN Rising (LT3581E, LT3581I)
Active Mode, SHDN Rising (LT3581H)
Active Mode, SHDN Falling (LT3581E, LT3581I, LT3581H)
l
l
l
1.27
1.27
1.24
1.33
1.33
1.3
1.41
1.44
1.38
V
V
V
SHDN
Input Voltage Low Shutdown Mode
l
0.3 V
SHDN Pin Bias Current V
SHDN
= 3V
V
SHDN
= 1.3V
V
SHDN
= 0V
9.7
40
11.4
0
60
13.4
0.1
µA
µA
µA
CLKOUT Output Voltage High C
CLKOUT
= 50pF 1.9 2.1 2.3 V
CLKOUT Output Voltage Low C
CLKOUT
= 50pF 5 200 mV
CLKOUT Duty Cycle T
J
= 25°C 42 %
CLKOUT Rise Time C
CLKOUT
= 50pF 12 ns
CLKOUT Fall Time C
CLKOUT
= 50pF 8 ns
GATE Pull Down Current V
GATE
= 3V (LT3581E, LT3581I)
V
GATE
= 3V (LT3581H)
V
GATE
= 80V (LT3581E, LT3581I, LT3581H)
l
l
l
800
700
800
933
900
933
1100
1100
1100
µA
µA
µA
GATE Leakage Current V
GATE
= 50V, GATE Off 0.01 1 µA
FAULT Output Voltage Low 50μA into FAULT Pin (LT3581E, LT3581I)
50μA into FAULT Pin (LT3581H)
l
l
100
100
300
400
mV
mV
FAUL
T Leakage Current V
FAULT
= 40V, FAULT Off 0.01 1 µA
FAULT Input Voltage Low
l
700 750 800 mV
FAULT Input Voltage High
l
950 1000 1050 mV
guaranteed over the full –40°C to 150°C operating junction temperature
range. Operating lifetime is derated at junction temperatures greater than
125°C.
Note 3: Current limit guaranteed by design and/or correlation to static test.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation over the specified maximum operating junction
temperature may impair device reliability.
