Datasheet

LT8609/LT8609A/LT8609B
4
Rev. H
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PARAMETER CONDITIONS MIN TYP MAX UNITS
PG Lower Threshold Offset from V
FB
LT8609/LT8609A:
V
FB
Falling
l
5.0 8.5 13.0 %
LT8609B:
V
FB
Falling
l
4.0 8.5 14.0 %
PG Hysteresis 0.5 %
PG Leakage V
PG
= 42V
l
±200 nA
PG Pull-Down Resistance V
PG
= 0.1V 550 1200 Ω
Sync Low Input Voltage LT8609/LT8609A
l
0.4 0.9 V
Sync High Input Voltage LT8609/LT8609A:
INTV
CC
= 3.5V
l
2.7 3.2 V
TR/SS Source Current
l
1 2 3 µA
TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 300 900 Ω
Spread Spectrum Modulation Frequency LT8609/LT8609A:
V
SYNC
= 3.3V 1 3 6 kHz
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. Absolute Maximum Ratings are those values beyond
which the life of a device may be impaired.
Note 2: The LT8609E/LT8609AE/LT8609BE 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 LT8609I/LT8609AI/LT8609BI is
guaranteed over the full –40°C to 125°C operating junction temperature
range. The LT8609H/LT8609AH/LT8609AJ 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 3: This IC includes overtemperature protection that is intended to
protect the device during overload conditions. Junction temperature will
exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
will reduce lifetime.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
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