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LM3488Q-Q1: LM3488Q-Q1 voltage drop at 300mA instead of 1A

Jyothi S
Prodigy 10 points
Part Number: LM3488Q-Q1

Hi, 

I am working with LM33488MM/NOPB which is a 2.97V to 40V wide Low side N channel controller for switching regulator. Circuit is exactly same as mentioned in datasheet, but we are unable to get the 5V at 1A. Voltage will drop from 5V to 4.32v at 366mA. I have attached a graph of load testing at 5V, please check and provide the necessary information to resolve this issue.

  • 0
    TI__Mastermind 45331 points

    Hi Jyothi,

    thank you for using the E2E forum.

    Can you give me the direct reference to the circuit in the datasheet you have used?

    Are you using the exact same components?

    Can you measure the Duty cycle of the Switch node  (Gate and Drain of the MSOFET)

    Can you check that the supply is still providing the required voltage and let me know the input current at a load of e.g.400mA

    Best regards,

     Stefan