Data Sheet

LT8641A

analog.com

Rev 0

6 of 35

indicated in the operational section of this specification is not implied. Operation beyond the maximum

operating conditions for extended periods may affect product reliability.

2

The LT8641AR is specified over the –40°C to 150°C operating junction temperature range. High junction

temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than

125°C. Note that the maximum ambient temperature consistent with these specifications is determined by

specific operating conditions in conjunction with the board layout, rated package thermal impedance, and

other environmental factors.

The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and power

dissipation (PD, in Watts) according to the formula:

TJ = TA + (PD × θJA)

where θJA (in °C/W) is the package thermal impedance.

3

θ values determined per JEDEC 51-7, 51-12. See the Applications Information section for information on

improving the thermal resistance and for actual temperature measurements of a demo board in typical

operating conditions.

4

This IC includes overtemperature protection intended to protect the device during overload conditions.

Junction temperature exceeds 150°C when overtemperature protection is active. Continuous operation above

the specified maximum operating junction temperature reduces lifetime.