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LM60430: Device behavior when the input voltage drops to the designed output voltage or below

Yishai Kagan1
Prodigy 40 points
Part Number: LM60430
Other Parts Discussed in Thread: LMR33630

I have an application where I need the normal output level to be 5V. It is possible that in some instances the input voltage will drop to 4.5V. This may or may not be OK, depending on the IC behavior. If it keeps a duty cycle of 98% or so, which is almost bypass, and passes close to 3A that's OK. If not it will necessitate a more expensive solution. This design is VERY cost sensitive. I could not find a description of what happens in this range of input voltages.

  • 0
    TI__Guru 50120 points

    Hi Yishai,

    This is a step down (buck) converter that drops high voltage to lower voltage. Even at 98% duty cycle at frequency foldback, the output will always be lower than the input. Clearly this would now be applicable for your 4.5Vin to 5Vout application. 

    It might make more sense for you to look into a buck-boost converter. 

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 40 points

    Sorry that you totally misunderstood my question. 

    I decided to use the LMR33630 where the information I was looking for is specified in the datasheet, and the cost is lower.