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LM25149-Q1: Question about Low Vin operation

Part Number: LM25149-Q1

Hello Team,

I got a question from customer about Low VIN operation.

The datasheet says "The LM25149-Q1 can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed."

Q. Can you tell me how long will the high-side FET be continuously turned on? (ex. Up to 10 cycle? Until CBOOT UVLO detection?)

Thanks,

Yuta Kurimoto

  • Yuta,

    The LM25149-Q1 will skip low-side FET pulses and keep high-side FET ON until CBOOT UVLO yes.

    Immediately after the UVLO there will be a 2x minimum off-time 120ns(typ) for boot refresh.

    Let me know if you have further questions!

    -Orlando