Datasheet

LM2940-N, LM2940C
www.ti.com SNVS769H –MAY 2004–REVISED MARCH 2007
Absolute Maximum Ratings
(1)
LM2940S, J, WG, T, MP ≤ 100 ms 60V
LM2940CS, T ≤ 1 ms 45V
Internal Power Dissipation
(2)
Internally Limited
Maximum Junction Temperature 150°C
Storage Temperature Range −65°C ≤ T
J
≤ +150°C
Soldering Temperature
(3)
TO-220 (T), Wave 260°C, 10s
TO-263 (S) 235°C, 30s
SOT-223 (MP) 260°C, 30s
LLP-8 (LD) 235°C, 30s
ESD Susceptibility
(4)
2 kV
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which
the device functions but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical
Characteristics.
(2) The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
, the junction-to-ambient thermal
resistance, θ
JA
, and the ambient temperature, T
A
. Exceeding the maximum allowable power dissipation will cause excessive die
temperature, and the regulator will go into thermal shutdown. The value of θ
JA
(for devices in still air with no heatsink) is 60°C/W for the
TO-220 package, 80°C/W for the TO-263 package, and 174°C/W for the SOT-223 package. The effective value of θ
JA
can be reduced
by using a heatsink (see Application Hints for specific information on heatsinking). The value of θ
JA
for the LLP package is specifically
dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power
dissipation for the LLP package, refer to Application Note AN-1187. It is recommended that 6 vias be placed under the center pad to
improve thermal performance.
(3) Refer to JEDEC J-STD-020C for surface mount device (SMD) package reflow profiles and conditions. Unless otherwise stated, the
temperature and time are for Sn-Pb (STD) only.
(4) ESD rating is based on the human body model, 100 pF discharged through 1.5 kΩ.
Operating Conditions
(1)
Input Voltage 26V
Temperature Range
LM2940T, LM2940S −40°C ≤ T
J
≤ 125°C
LM2940CT, LM2940CS 0°C ≤ T
J
≤ 125°C
LM2940IMP −40°C ≤ T
A
≤ 85°C
LM2940J, LM2940WG −55°C ≤ T
J
≤ 125°C
LM2940LD −40°C ≤ T
J
≤ 125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which
the device functions but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical
Characteristics.
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