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Super Capacitor charging by boost DCDC for SSD backup

K. Sasaki14
Guru 10200 points
Other Parts Discussed in Thread: TPS62130, TPS563209, TPS61046, TPS61089, TPS61087, TPS25940

Our customer is thinking to use the attached circuit block for SSD backup.
Could you tell me recommended boost converter in this application?
And In this case, do you have any concern? If you have anything, please let me know recommended composition.

I looked "TIDA00304" material. In this composition, super cap charging line and discharge line is separated.
I would like to know the reason that these charge and discharge line are separated if you recommend this pattern.

SSD Boosted Backup circuit.pptx

Best Regards,
Kohei Sasaki

  • 0
    TI__Expert 5055 points
    Hi,

    Is there another step down converter after the 10V?
    Which typ of supercaps to you want to use? 4 times in series?

    Thanks & Regards
    Michael
  • 0 in reply to Michael Helmlinger
    Guru 10200 points

    Michael-san,

    There is 4 step down converters. We suggest our customer TPS62130 or TPS563209. Use condition is the following,
    Output voltage, Iout
    1.2V, 2A
    1.35V, 1.5A
    1.8V, 1.2A
    3.3V, 0.8A

    Super capacitor is 2.7F / 2.7V. They will use it as 4s2p.

    Best Regards,
    Kohei Sasaki

  • 0
    TI__Mastermind 46905 points
    about the boost converter, please have a look at TPS61046 firstly. let me know if TPS61046 is not good enough and why. there are several boost converter can support 5V input and 10.8V output voltage.
  • 0 in reply to Jasper Li
    Guru 10200 points

    Jasper-san,

    TPS61046 current limit value is 0.6A(min).
    I think this is low and approximately 2.5A current limit is needed to provide energy to load.

    Can we use general purpose boost converter without any concern?
    Should the serial current limit resistor to output of boost converter when we use switching regulator for charging super capacitor?
    If it is so, I think we should separate charge line to super capacitor and discharge line to load.

    Best Regards,
    Kohei Sasaki

  • 0 in reply to K. Sasaki14
    TI__Mastermind 46905 points
    Sasaki-san
    i thought the boost converter is just to charge the back up capacitor, so the current capability should depend on the charging time of the capacitor.
    you can have a look at TPS61089 for 2.5A current limit device, this device has current limit pin to change its current limitation.

    when Line voltage 5V is gone, the device will disable. no current flows from VOUT (the bulk capacitor) to VIN.
  • 0 in reply to Jasper Li
    Guru 10200 points
    Jasper-san,

    Thank you for your reply.
    It seems like that TPS61089 has not released yet. When is the RTM?
    And I'm thinking that we suggest TPS61087 and TPS25940 because it is proven device. Is there any concern?

    Best Regards,
    Kohei Sasaki
  • 0 in reply to K. Sasaki14
    TI__Mastermind 46905 points
    The TPS61089 will RTM at the end of this month. TPS61087 is also OK. but this device require external diode, so larger solution size and efficiency is a little lower.