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TPS61200: About out put capacitance and reverse voltage condition

Tsukui Yusuke
Guru 21930 points
Part Number: TPS61200

Hi,

Could you tell me about out put capacitance and reverse voltage condition.
Customers is reading the data sheet below.
Customers are considering installing a super cap on Cout to operate somewhat even if the input voltage is off.

There are two questions.

1.
Are there any problems with installing the 15mF super cap?
Please advise about the stable operation of device.

2.
The state of "Vin=0V or open ,Vout=2.1V " continues for several minutes.
Do reverse voltage conditions damage the TPS61200?
Please contact us if you have any concerns.
And Please let me know if there is a recommended additional circuit example for the Cout discharge circuit.

Regards,
Yusuke

  • 0
    TI__Mastermind 21565 points

    Hi Tsukui

    Sorry that I out of office today. I'll back next Monday. Please wait with patience. Thank you!

  • 0
    TI__Mastermind 21565 points
    Hi Tsukui:
    Thanks for your patient waiting.
    For the question 1:
    May you share some more detail information? I afraid the charge current during the startup will exceed the limit of the super cap or Vin supply.

    For the question 2:
    I'm not clear about the reverse voltage you mentioned. The TPS61200 has the function that could disconnect the load and input. (Could check the Function Block Diagram in datasheet.)
    And we have application note for the Low-Voltage, Reverse-Battery Protection Circuit: www.ti.com/.../slva315.pdf
  • 0 in reply to Minqiu Xie
    Guru 21930 points

    Minqiu-san,

    Thank you for your support.
    〉For the question 1:
    〉May you share some more detail information? I afraid the charge current during the startup will exceed the limit of the super cap or Vin supply. 
    →Super cap under consideration is BZ094B153ZNBA1.
    　Customer was trying to use it under the condition of Vin≒1.8V to 3.6V, Vout=2.1V.
        Like you said "Inrush current due to capacitor charging current causes voltage drop".

    〉For the question 2:
    〉I'm not clear about the reverse voltage you mentioned. The TPS61200 has the function that could disconnect the load and input. (Could check the Function Block Diagram in datasheet.)
    〉And we have application note for the Low-Voltage, Reverse-Battery Protection Circuit: www.ti.com/.../slva315.pdf

    Thank you for your information.
    I will report it to the customer.

    Regards,
    Yusuke