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LM25118: For wide range input

Karthik B
Expert 1310 points
Part Number: LM25118

Hi,

I am have been simulating the LM25118 and listed all the details in the excel sheet as attached.

Here there are three cases 

1.The regulator input voltage is 3.7V li-polymer battery operated and in the webench I observed the following behaviour of the regulator as attached in the excelsheet figure 1

where the ripple is around 200mV. 

2.Case 2 where the input voltage is 12V and the webench result is attached in figure 2 of excel sheet. and ripple of 10mV is observed.

3. Case 3 where the input voltage is 24V and the webench result is attached in figure 3 of excel sheet. and ripple of 10mV is observed.

here the webench has provided different component list for three different voltages.But I am looking for a single design.

The load requirement is 5V, 3A power it should provide stable output in all the three cases.

I want a single design for my application and I have attached that in figure 4.

Please suggest if there is any concerns that I need to care so that this regulator works efficiently in all the three apllication

This will be used in a mass production around 1000 piece per year .

so please suggest your valuable feedback ASAP.

Regards,
KarthikReg_LM25118.xlsx

  • 0
    TI__Mastermind 21720 points
    Hi Karthik,

    Thanks for reaching out with your question.

    To implement a design that works for all conditions please just make sure that the input voltage range is 3.7V to 24V. This should create a design that works for all operating cases.

    In the first case (3.7V Li battery) please be aware that the LM25118 requires at least 5V to start-up as stated in section 7.4.3 of the datasheet.

    Please let me know if you have any questions.

    Thanks,

    Garrett