LTC6430 and LTC6431 thermal characteristics

Question

Hello, 
 For the LTC6430 & LTC6431 can you provide any/all of the following thermal parameters? 
 Theta-JcT (Junction to case top thermal resistance) Theta-JcB (Junction to case bottom [thermal pad] thermal resistance) Theta-Jb (Junction to board thermal resistance) 
 The LTC6430 provides a single thermal parameter theta-Jc. There is an asterisk with a note saying "Measured from Junction to the back of a PCB with natural convection". That isn't how I've ever seen Theta-Jc defined. That seems much more like Theta-Jb. 
 For the LTC6431, Theta-Jc is also provided but WITHOUT the same asterisk even those this is the identical case and a near identical part. 
 Thank you. 
 Mark

maaarmas · Accepted Answer

Hi Mark_Escape 
 I just got the results from the testing for both LTC6430 and LTC6431 which you can see below. 
 For LTC6430: 
 
 &theta; JA : 39.2 K/W 
 &theta; JCtop : 37.7 K/W 
 
 For LTC6431: 
 
 &theta; JA : 39.3 K/W 
 &theta; JCtop : 37.7 K/W 
 
 I hope this can help and if you have more question, feel free to comment or post a new one. Thank you! 
 
 Best regards, 
 Mae)

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LTC6430 and LTC6431 thermal characteristics