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LM5118 start-up

Atsushi Noda1
Intellectual 390 points
Other Parts Discussed in Thread: LM5118

LM(2)5118_Calculator(snvu065) has the description, "Vin at start of Transition to Buck-Boost Mode" .

It shows "Vout＜Vin×1.33" is required for a start-up.

Where of datasheet is this shown?

 

Best regards,

Atsushi Noda

  • 0
    TI__Guru 58171 points

    Hi

    It is on page 12. The LM5118 buck-boost regulator operates as a conventional buck regulator with emulated current mode control while VIN is greater than VOUT and the buck mode duty cycle is less than 75%.

    1.33 is from  1.33=1/0.75

    Regards,

     

  • 0
    TI__Mastermind 21720 points

    Atsushi,

    This refers to the input voltage at which the transition mode from pure buck to pure buck-boost begins. In the datasheet under "Operation Modes" on pg. 12 this is explained in more detail.

    For start-up Vin must be at least 5V.

    -Garrett Roecker