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LMR33610: What is the difference between LMR33610 and LMR33630?

Derek
Mastermind 9752 points
Part Number: LMR33610
Other Parts Discussed in Thread: LMR33630, , LMR36506, STRIKE

Hello, I'm working on a design with multiple power rails and would like to use the fewest number of different parts that I can. I have some loads that are 0.5A and some that are 3A.

What is the difference between the LMR33610 and the LMR33630?

The LMR33630 datasheet specifies the high side MOSFET ON-resistance (section 7.5) but these values are not in the LMR33610 datasheet.

If I use the LMR33630 parts at low loads, how much of an efficiency hit will I take?

Here are the rails I need to support. Input voltage range is 8V-28V:

3.3V, 3A (currently designed in LMR33630ADDA)

5V, 3A (currently designed in LMR33630ADDA)

3.3V, 0.5A (should I use LMR33610 or LMR33630?)

4.0V, 2A (currently designed in LMR33630A)

I also have one more power rail but this one has input voltage 14.5V - 15.5V:

5V, 0.5A (should I use LMR33610 or LMR33630?)

For the lower current rails I was going to use the new LMR36506 but the package is too fine pitch for this application and the part is not yet readily available.

What do you recommend? I'm trying to strike a balance between optimal efficiency and fewest number of parts.

Thanks,

Derek

  • 0
    TI__Mastermind 27045 points

    Hi Derek,

    Pls use LMR33630 for load current >=2A, use LMR33610 for load current below 1A. 

    LMR33630 may works at PFM mode at 0.5A load current, and inductor should be 4.5A rated even load current is 0.5A, so it's not recommended for light load application.

    B R

    Andy