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LM2990S-5.0 数据表(PDF) 9 Page - Texas Instruments

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部件名 LM2990S-5.0
功能描述  LM2990 Negative Low Dropout Regulator
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM2990S-5.0 数据表(HTML) 9 Page - Texas Instruments

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LM2990
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SNVS093D – JUNE 1999 – REVISED APRIL 2013
Typical Performance Characteristics (continued)
Maximum Power
Maximum Power Dissipation
Dissipation (TO-220)
(TO-263)(1)
Figure 23.
Figure 24.
(1)
The maximum power dissipation is a function of TJmax, θJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD = (TJmax − TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 125°C, and the LM2990 will
eventually go into thermal shutdown at a TJ of approximately 160°C. For the LM2990, the junction-to-ambient thermal resistance, is
53°C/W, 73°C/W for the DDPAK/TO-263, and the junction-to-case thermal resistance is 3°C. If the DD[AK/TO-263 package is used, the
thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package. Using 0.5 square
inches of copper area,
θJA is 50°C/W; with 1 square inch of copper area, θJA is 37°C/W; and with 1.6 or more square inches of copper
area,
θJA is 32°C/W.
Typical Applications
Figure 25. Post Regulator for an Isolated Switching Power Supply
The LM2940 is a positive 1A low dropout regulator; refer to its datasheet for further information.
Figure 26. Fixed Current Sink
Figure 27. Adjustable Current Sink
Copyright © 1999–2013, Texas Instruments Incorporated
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