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LM26480: Just like the LM26480 but 2A on one of the two rails?

Bob C
Intellectual 615 points
Part Number: LM26480
Other Parts Discussed in Thread: LM26484, LP873222-Q1, LP873220-Q1

Hello,

The LM26480 looks to be an almost perfect fit for an application of mine, but the 1.5A on rail 1 is a little tight.  Otherwise the 1.5A on rail 2 and the two LDOs at 300 mA are ideal ( along with their voltage ranges ). 

Is there something in the catalog that acts like LM26480 but has more current on rail 1?  Please point out your closest match.  Also, I like the low cost and discrete enable signals, but I can do I2C if need be. 

Also, is there a way to cheat and have 1.8A on rail 1 and 1.2A on rail 2 ( still 3.0A total for both bucks )? 

Thank you,

Bob

  • 0
    TI__Genius 10885 points
    Hi Bob,

    Technically the current rating is limited by the switching current limits, which is maximum 2.4A, so depending on what conditions and how often you need 1.8A it might still be feasible. We don't have a device in the same family that only increases the buck currents. For example, the LM26484 has two 2A bucks but one LDO controller.

    The LP87322 is a new and similar device that can be reconfigured via i2c before enabling the regulators. It does have default settings that need to be taken into consideration if the enables could be accidentally asserted.

    Best Regards,
    Rick S.
  • 0 in reply to Richard Solarski
    Intellectual 615 points
    Thank you Rick.

    The LP87322 looks like a nice part and would probably meet my needs.

    From searching around on the TI site, I'm finding LP87322B/D/E/F-Q1 and LP873222-Q1.

    My application is a consumer product. Is there a non-automotive part?

    Is there a particular part in this family that will have the lowest cost and best availability?

    Thanks again,

    Bob
  • 0 in reply to Bob C
    TI__Genius 10885 points
    Hi Bob,

    I'm not 100% sure, but I've looped in an engineer who is more familiar with these devices and may be able to comment.

    Best Regards,
    Rick S.
  • 0 in reply to Richard Solarski
    TI__Genius 16410 points
    Hi Bob,

    Since the difference between each version is just the OTP programming, cost and availability will be the same for each version.

    There's no LP8732 non-automotive device today, but we have a non-auto version of the LP873220-Q1 version planned for early next year. I'm expecting it to release in 1Q 18.

    Regards,
    Karl