Datasheet

LT8300
3
8300f
elecTrical characTerisTics
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 SW pin is rated to 150V for transients. Depending on the
leakage inductance voltage spike, operating waveforms of the SW pin
should be derated to keep the flyback voltage spike below 150V as shown
in Figure 5.
Note 3: The LT8300E is guaranteed to meet performance specifications
from 0°C to 125°C operating 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 l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, V
EN/UVLO
= V
IN
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
V
IN
Input Voltage Range 6 100 V
V
IN
UVLO Threshold Rising
Falling
5.8
3.2
6 V
V
I
Q
V
IN
Quiescent Current V
EN/UVLO
= 0.3V
V
EN/UVLO
= 1.1V
Sleep Mode (Switch Off)
Active Mode (Switch On)
1.2
200
70
330
2 µA
µA
µA
µA
EN/UVLO Shutdown Threshold For Lowest Off I
Q
l
0.3 0.75 V
EN/UVLO Enable Threshold Falling
Hysteresis
l
1.199 1.223
0.016
1.270 V
V
I
HYS
EN/UVLO Hysteresis Current V
EN/UVLO
= 0.3V
V
EN/UVLO
= 1.1V
V
EN/UVLO
= 1.3V
–0.1
2.2
–0.1
0
2.5
0
0.1
2.8
0.1
µA
µA
µA
f
MAX
Maximum Switching Frequency 720 750 780 kHz
f
MIN
Minimum Switching Frequency 6 7.5 9 kHz
t
ON(MIN)
Minimum Switch-On Time 160 ns
t
OFF(MIN)
Minimum Switch-Off Time 350 ns
t
OFF(MAX)
Maximum Switch-Off Time Backup Timer 200 µs
I
SW(MAX)
Maximum SW Current Limit
l
228 260 292 mA
I
SW(MIN)
Minimum SW Current Limit
l
34 52 70 mA
SW Over Current Limit To Initiate Soft-Start 520 mA
R
DS(ON)
Switch On-Resistance I
SW
= 100mA 10 Ω
I
LKG
Switch Leakage Current V
IN
= 100V, V
SW
= 150V 0.1 0.5 µA
I
RFB
R
FB
Regulation Current
l
98 100 102 µA
R
FB
Regulation Current Line Regulation 6V ≤ V
IN
≤ 100V 0.001 0.01 %/V
t
SS
Soft-Start Timer 2.7 ms
The LT8300I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8300H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT8300MP is guaranteed
over the full –55°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes. Operating lifetime is
derated at junction temperature greater than 125°C.
Note 4: The LT8300 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 above the specified maximum operating junction
temperature may impair device reliability.