Data Sheet

LT8638-2

analog.com

Rev.0

5 of 35

ABSOLUTE MAXIMUM RATINGS

TA = 25°C unless otherwise specified.

Table 2. Absolute Maximum Ratings(1)

PARAMETER

RATING

VIN, EN/UV, PG

42V

BIAS

25V

FB, SS, PHMODE

4V

SYNC/MODE Voltage

6V

Operating Junction Temperature Range(2)(3) LT8638RV-2

−

40°C to 150°C

Storage Temperature Range

−

65°C to 150°C

Maximum Reflow (Package Body) Temperature

260°C

.

1

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

These are stress ratings only, functional operation of the product at these or any other conditions above those

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 LT8638RV-2 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 (TAin °C) and power dissipation

(PD, in Watts) according to the formula:

TJ = TA + (PD × JA)

where, JA (in °C/W) is the package thermal impedance.

3

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.

4

 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.