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LP8861-Q1 Vin = Vout(external Diode cathode side)

Other Parts Discussed in Thread: LP8861-Q1

Dear, Sir.

My customer is asking the LP8861-Q1 behavior under Vin = Vout condition.

The datasheet is too brief, so I need your advice.

I wonder LP8861-Q1 will stop switching(internal Boost FET off), and the drop

voltage across the diode will provide to Vout?

Best Regards,

H. Sakai

  • Dear H. Sakai,

    Thank you for your inquire. Your assumption is correct. If you are using LP8861-Q1 with boost configuration and Vin=Vout generally, you should expect that the boost will stop switching. Actually, (and depending on your test conditions) the boost might stop switching when Vin and Vout get closer to each other. Obviously, if you use LP8861-Q1 with SEPIC configuration then the boost would still be switching when Vin=Vout.

    I hope this helps.

    Regards,

    David D Quintana