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LM20143-Q1: not working at high temperature, it is continously restarting.

Part Number: LM20143-Q1

I am using LM20143-Q1 in my board,

IC is not working at high temperature (85 degree C). 

  • Ajay,

    LM20143-Q1 should operate at ambient temperature of 85 C. For 3 A output, the power dissipation is about 523 mW. There are a few items to check:
    1. How is your layout? Do you have adequate heat dissipating copper connected to the thermal pad? If not you may experience thermal over temperature protection. Can you check your device case temperature?
    2. UVLO. Is your input voltage sagging below 2.95? Check for ripple below that level as well as DC.
    3. Over current. Check the peak inductor current.

    Can you post waveforms including the SW node at shutdown?
  • Ajay,

    Any further updates? If not I will close this for now. If you need additional assistance you can re-open this thread.