Datasheet

LM22676
LM22676-Q1
SNVS587K –SEPTEMBER 2008–REVISED APRIL 2013 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 ensured 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
V
EN
Enable Threshold Voltage Falling 1.3 1.6 1.9 V
V
ENHYST
Enable Voltage Hysteresis 0.6 V
I
EN
Enable Input Current EN Input = 0V 6 µA
T
SD
Thermal Shutdown Threshold 150 °C
θ
JA
Thermal Resistance TJ Package Junction to ambient 22 °C/W
thermal resistance
(3)
θ
JA
Thermal Resistance MR Package Junction to ambient 60 °C/W
thermal resistance
(4)
(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 (SNVA328)
for more information.
(4) The value of θ
JA
for the SO PowerPAD exposed pad (MR) package of 60°C/W is valid if package is mounted to 1 square inch of copper.
The θ
JA
value can range from 42 to 115°C/W depending on the amount of PCB copper dedicated to heat transfer.
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