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WEBENCH® Tools/LM2775-Q1: temperature range and power dissipation of LM2775-Q1

Part Number: LM2775-Q1

Tool/software: WEBENCH® Design Tools

Hi Team,

two questions: 

1. from the datasheet, it seems the Tj temp range is only up to 125C, but for Q1 part, it's always 150C, please kindly check. 

2. for power dissipation, 3.3Vin, 5Vout, 10mAIout, from the equation in datasheet, power loss of the part should only be ~35mW. 

but from webench, it shows 235mW with ~60% eff which seems cannot match each other.  Please kindly check. 

  • Hi Given,

    To answer your 1st question:  the LM2775-Q1 is a repurposed device for Q-grade, and its max Tj is 125C.   All our new Q-grade devices have Tj=150C.

    Regarding the 2nd question:  could you show me how did you get 50mW by calculation?  I am actually out of office on a biz trip now.  You can reach me through email, as e2e response may be delayed.

    Thanks,

    Youhao

  • Hi Given,

    Is the issue resolved?  Let me close this thread now but you can re-open by adding a new post.  This has been two weeks without activity.

    Thanks,

    Youhao