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LM7480-Q1: to replace the charger BATFETs

Sam Ting
Expert 3550 points
Part Number: LM7480-Q1
Other Parts Discussed in Thread: LM74800-Q1, LM7480, LM74800EVM-CD

Tool/software:

Hi team,

My customer would like to use LM7480 to replace the power path of charge BATFETs. Could you comment on the flexibility? The key concerns will be fast turn-on time (in discharge mode) and fast reverse current blocking, are there any other design considerations? Is the LM74800-Q1 (linear regulation) or LM74801-Q1 (comparator only) better for this type of application? Thanks!

Regards,
Sam Ting
  

  • +1
    TI__Mastermind 45760 points

    Hi Sam,

    LM74800-Q1 ensures 0A of DC reverse current flow whereas LM74801-Q1 will have DC reverse current flow until the comparator is triggered.

    Rest both the devices are same. You can decide on the basis of DC reverse current flow.

    Regards,

    Shiven Dhir

  • 0 in reply to Shiven Dhir
    TI__Expert 3550 points

    Hi Shiven,

    We are planning to use the EVM, LM74800EVM-CD on board evaluation, but the max load current is only 10A. Can you comment on how to modify it for the following specs, or any other EVMs available? 

    VBATT= 16~24.6V
    VOUT= 16~30V
    Max load current= 22.6A

    Regards,
    Sam Ting

  • 0 in reply to Sam Ting
    TI__Mastermind 45760 points

    Hi Sam,

    Max load is limited by the board construction and cannot be increased.

    You can use higher voltage without an issue.

    Regards,

    Shiven Dhir

  • 0 in reply to Shiven Dhir
    TI__Expert 3550 points

    Hi Shiven,

    Could you explain the board design limitation in detail? Engineers need to verify the actual performance on EVM, then have confidence to implement the new solution for the projects. Or do we have other existing EVMs can support this spec? Thanks!

    Regards,
    Sam Ting

  • +1 in reply to Sam Ting
    TI__Mastermind 45760 points

    Hi Sam, 

    The board traces cannot handle that high of a current. Customer can evaluate at lower current as behavior of the controller will not change with increase in load current.

    Once the controller has entered full conduction mode (DGATE fully enhanced), the performance will be the same with increased current as well.

    Regards,

    Shiven Dhir