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LM3940ISX-3.3 bảng dữ liệu(PDF) 2 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM3940 1A Low Dropout Regulator for 5V to 3.3V Conversion
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LM3940ISX-3.3 bảng dữ liệu(HTML) 2 Page - Texas Instruments

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LM3940
SNVS114E – MAY 1999 – REVISED MARCH 2013
www.ti.com
Figure 4. 16-Lead CDIP
Figure 5. 16-Lead CLGA
(Top View)
(Top View)
Drawing Number NFE0016A
Drawing Number NAC0016A
A.
Pin 2 and pin 7 are fused to center DAP.
B.
Pin 5 and 6 need to be tied together on PCB board.
Figure 6. 8-Lead WSON
(Top View)(A)(B)
Drawing Number NGN008A
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
(1)
Storage Temperature Range
−65°C to +150°C
Lead Temperature (Soldering, 5 seconds)
260°C
Power Dissipation (2)
Internally Limited
Input Supply Voltage
7.5V
ESD Rating (3)
2 kV
(1)
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply
when operating the device outside of its rated operating conditions.
(2)
The maximum allowable power dissipation is a function of the maximum junction temperature, TJ, the junction-to-ambient thermal
resistance,
θJA, and the ambient temperature, TA. Exceeding the maximum allowable power dissipation will cause excessive die
temperature, and the regulator will go into thermal shutdown. The value of
θJA (for devices in still air with no heatsink) is 60°C/W for the
TO-220 package, 80°C/W for the DDPAK/TO-263 package, and 174°C/W for the SOT-223 package. The effective value of
θJA can be
reduced by using a heatsink (see APPLICATION HINTS for specific information on heatsinking). The value of
θJA for the WSON
package is specifically dependant on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal
resistance and power dissipation for the WSON package, refer to Application Note AN-1187 SNOA401. The
θJA rating for the WSON is
with a JESD51-7 test board having 6 thermal vias under the exposed pad.
(3)
ESD rating is based on the human body model: 100 pF discharged through 1.5 k
Ω.
Operating Ratings
(1)
Junction Temperature Range, TJ
−40°C to +125°C
Input Supply Voltage, VIN(MIN)
VO + VDO
(1)
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply
when operating the device outside of its rated operating conditions.
2
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM3940


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