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What is the difference between the TPS2561 AND TPS2561A?

Hrag Kasparian
Prodigy 100 points
Other Parts Discussed in Thread: TPS2561, TPS2561A, TPS25200

What is the difference between the TPS2561 AND TPS2561A?

  • 0
    TI__Mastermind 42795 points

    TPS2561A IOS (current limit) is tested under a different conditions to meet MFI.

  • 0 in reply to Eric Wright
    Prodigy 100 points

    Hello Eric,

    Thanks for the response.  By the way, can you please explain what MFI means?

    Also, I want to make a USB charger port for the new 12W USB (5V at 2.4A) charge capable devices.  Which IC would you recommend that I use: the TPS2561 or the TPS2561A?

    Thanks.

  • 0 in reply to Hrag Kasparian
    TI__Intellectual 2795 points

    Compared with TPS2561, the only difference is TPS2561A can guarantee 2.1A to 2.5A including external +/-1% resistor, now for 2.4A charging, the new current limit range request is 2.5A to 2.9A, TPS2561 and TPS2561A can’t meet the spec based on the calculation equal on page 12.

    But TPS25200 can meet the spec based on the calculation result as 10.2.1.2.4 description.

    Now, for your customer, wether request must meet 2.5A to 2.9A including external resistor or not?

  • 0 in reply to Milo Zhu
    Prodigy 100 points

    Hello Milo,

    1.  On page 14 of the TPS2561 and TPS2561A datasheets, it is stated that if, for example, I use a 1% 20Kohm current-limit setting resistor, the current limit will be 2560mA to 3035mA.  Won't this work for my application which needs 2.4A charge current (per the new 12W USB charging requirement)?  This should guarantee 2.4A charging over the entire operating temp. range, right?

    2.  Also, if it is true that the the current limit using a 1% 20Kohm resistor will ensure 2.4A charging, AND if the current limit equations are the same for both the TPS2561 and the TPS2561A, then what exactly is the difference between using the TPS2561 and the TPS2561A, with a 1% 20Kohm current limit setting resistor?

    Thanks in advance.

  • 0 in reply to Hrag Kasparian
    TI__Intellectual 2795 points

    1. Based on the calculation equal, use a +、-1% 20kohm current limti setting resistor, we can get the 2560mA to 3035mA current limit. Also for 2.4A charging, ignore the 2.5A to 2.9A and assume the up-stream power and provide exceed 3035mA, it is ok.

    2. Becassue somee customer request us gurantee 2.1A to 2.5A including external +/1% resistor in production, so we re-do the characterization for 24.3k and 47.5k resistor and put the parameters on the datasheet, and you can find the infromation on page 3.

  • 0 in reply to Milo Zhu
    Prodigy 100 points

    I understand.  So why is it that the current limit on page 3 for both the 24.3K and 47.5K resistors are both the same (2.1A to 2.5A)?  Shouldn't each resistor value provide a different over-current threshold?

  • 0 in reply to Hrag Kasparian
    TI__Intellectual 2795 points

    24.3 @ OUTx connect to GND, 47.5 @ OUT1 and OUT2 connected to GND. So for 24.3k both channel can support 2.1A to 2.5A, for 47.5k, becasue some customer's applicaiotn is one singel port and request lower Rds,on, at this moment, they can combine OUT1 and OUT2 together, resistance halved, also using 47.5k can support 2.1A to 2.5A.

  • 0 in reply to Milo Zhu
    Prodigy 100 points

    This clarifies everything.  Thank you Milo.