LT8310
5
8310f
For more information www.linear.com/LT8310
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
= 24V, UVLO = 24V, OVLO = 0V, SYNC = 0V, SENSE = 0V, unless
otherwise noted.
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: All voltages are relative to GND unless otherwise noted. All pin
currents are defined positive into the pin unless otherwise noted.
Note 3: Do not apply a positive or negative voltage or current source to the
GATE or SOUT pins, otherwise permanent damage may occur.
Note 4: The LT8310E 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
LT8310I is guaranteed over the full −40°C to 125°C operating junction
temperature range. The LT8310H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT8310MP is guaranteed
over the full –55°C to 150°C operating junction temperature range.
Operating lifetime is
derated at junction temperatures greater than 125°C.
Note 5:
The LT8310 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 junction temperature may impair device reliability.
Note 6: V
SET
= V
INTVCC
– V
RDVIN
.
Note 7: Line regulation in duty mode control applications is constrained
by the accuracy of the RDVIN pin input current, the duty mode control
gain, and the external set resistor, R
SET
. R
SET
should be specifiied to 1%
or better.
Note 8: See the Timing Diagrams section.
PARAMETER CONDITIONS MIN TYP MAX UNITS
SOUT-to-GATE Delay (t
PRE
) SOUT Falling to GATE Rising (Note 8)
l
190 240 300 ns
GATE-to-SOUT Delay (t
POST
) GATE Falling to SOUT Rising (Note 8)
l
0 12 25 ns
Soft-Start
SS Active Switching Level (GATE Switches) 0.95 1.00 1.05 V
SS Frequency Foldback Complete f
OSC
within Specified Limits
l
2.5 V
SS Pin Current (Note 8) Soft-Up
Slow Wake
Hard-Down, V
SS
= 0.4V
l
l
–60
–6
–50
–5
6
–40
–4
µA
µA
mA
SS Reset Threshold Voltage 0.27 V
