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TPS62088: Output filter

Yuto Sakai
Mastermind 6100 points
Part Number: TPS62088
Other Parts Discussed in Thread: TPS62821, TPS62671, TPS82671, TPS62801,

Hi,

I would like to use an output inductor with 1 μF,
but are there recommended values for output capacitors and other parts?

Best Regards,
Yuto Sakai

  • 0
    TI__Guru*** 142880 points
    Hi Sakai-san,

    It is not recommended to use a 1uH inductor. This device is designed for smallest size, so a small inductance should be used to achieve this.

    Please see the TPS62821 family for use with a 1uH inductor. However, its performance is still better with the standard 470 nH inductor.
  • 0 in reply to Chris Glaser
    Mastermind 6100 points

    Hi Chris-san,

    Our customers place importance on efficiency as well as small size.
    If they can put it on the board, They are trying to use an inductor with a slightly larger inductance value.
    Therefore they are considering 1 μH.
    Can you tell me that it is designed with a small size as the target,
    but could you tell me the recommended value of peripheral components such as the output capacitor's capacitance value or the calculation method?

    Best Regards,
    Yuto Sakai

  • 0 in reply to Yuto Sakai
    TI__Guru*** 142880 points
    Please do not use a 1uH inductor. This is not slightly larger--it is 4x the recommended value. Why do they not use a 240 nH inductor, as recommended?

    If this is the same 3.3Vin, 1.8Vout, 500 mA rail that we discussed in your other thread, there are even smaller options. Please see TPS62801/2, TPS62671, TPS82671, etc.
  • 0 in reply to Chris Glaser
    Mastermind 6100 points
    Hi Chris-san,

    Thank you for your reply.

    Even if it gets a little size up, I am considering efficiency and I am considering that efficiency will improve by using 1 μH inductor.

    I compared the efficiency curve described in the datasheet with other products, but TPS62088 is considered the most efficient device,
    so I am considering it.

    I am aware that 1 μH is not the recommended value, but if there is a possibility that the efficiency will be good,
    I would like to present the surrounding recommendation value to the customer along with the risk.
    Is there any information?

    Best Regards,
    Yuto Sakai
  • 0 in reply to Yuto Sakai
    TI__Guru*** 142880 points
    Can you let me know your Vin, Vout, and Iout so that I can recommend a small device which is most efficient?
  • 0 in reply to Chris Glaser
    Mastermind 6100 points

    Hi Chris-san,

    The conditions are as follows.
    Vin = 3.3 V
    Vout = 1.8 V
    Iout = 500 mA

    Best Regards,
    Yuto Sakai

  • 0 in reply to Yuto Sakai
    TI__Guru*** 142880 points
    Thanks for confirming.

    The TPS62088 D/S shows 92.5% efficiency at that operating point.

    TPS62821 shows 95%.

    If you can start a private 'conversation' with me, please share the customer and application and why they really want to use TPS62088. We may have other small options that are a better fit than these.