Datasheet

LM22679/LM22679Q
SNVS581K –FEBRUARY 2013–REVISED NOVEMBER 2012 www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature (T
J
) range of -40°C
to +125°C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values
represent the most likely parametric norm at T
A
= T
J
= 25°C, and are provided for reference purposes only. Unless otherwise
specified: V
IN
= 12V.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
T
SD
Thermal Shutdown Threshold 150 °C
Junction to ambient thermal 22 °C/W
θ
JA
Thermal Resistance
resistance
(3)
(3) The value of θ
JA
for the PFM (TJ) package of 22°C/W is valid if package is mounted to 1 square inch of copper. The θ
JA
value can
range from 20 to 30°C/W depending on the amount of PCB copper dedicated to heat transfer. See application note AN-1797 for more
information.
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