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Questions of TPS622314

Takahiro Nishizawa
Genius 5575 points

We have questions about TPS622314.

Question 1.

Please tell us the recommended minimum supply voltage under the following conditions.

Vout=1.5V(fixed)

Iout=200mA

Full temperature(-40~125℃)

Our conditions apply to both of the following in datasheet p.6

Which one should we give priority?

  1. VOUT ≤ VIN –1 V : max 3.6V

  2. VOUT ≤ 1.8 V : max 2.05V

Question 2.

Can we use TPS622314 under following conditions?

We are concerned about high switching frequency and minimum on-time.

 1. Vin=5V     Iout=200mA

 2. Vout=3.3V   Iout=200mA

Best regards,

Takahiro Nishizawa

  • 0
    TI__Expert 3645 points
    Hello,
    about your first question, you should use equation 1 (Vin-Vout ≥ 1)in the recommended operating conditions. The datasheet states only the nominal and maximum value of the minimum Vin. About your second question, both the scenario should be ok.
  • 0 in reply to Alfonso Furio
    Genius 5575 points
    Thank you for your answer!

    We understand that we should use (Vin-Vout ≥ 1.

    Minimum input voltage is 3.6V in under the above condition.
    We think that we can't use TPS622134 when Vin is 3.3V.
    But you said that both the scenario should be ok.
    Please tell us your opinion.

    Best regards,
    Takahiro Nishizawa
  • 0 in reply to Takahiro Nishizawa
    TI__Expert 3645 points
    Hello,
    according to the scenario that you described:
    1) Vin= 5V
    2) Vin= 3.3 V (I think it was Vin and not Vout in your first post)
    What is reported in the recommended operating conditions is the maximum and nominal value of the minimum Vin. The maximum voltage that can be supplied is 6V.
  • 0 in reply to Alfonso Furio
    Genius 5575 points
    Thank you for your support!

    I'm sorry. I mistake about 3.3V.

    We understand that we should use (Vin-Vout ≥ 1.
    Minimum Vin is 3.6V when Vin-Vout ≥ 1 in datasheet.

    Vin=3.3V
    Vout=1.5V
    Iout=200mA

    Can we use TPS622314 under the above condition?
    We are concerned about Vin(3.3V our condition) and minimum Vin(datasheet).

    Best regards,
    Takahiro Nishizawa
  • 0 in reply to Takahiro Nishizawa
    TI__Expert 3645 points
    Hello,
    You're welcome. I don't see any problem with the conditions that you reported above.
  • 0 in reply to Alfonso Furio
    Genius 5575 points
    Thank you for your answer!


    Minimum Vin is 3.6V when Vin-Vout ≥ 1 in datasheet.

    Minimum Vin is 3.6V.
    Why we can use this IC when Vin is 3.3V and Vout is 1.5V?

    Best regards,
    Takahiro Nishizawa
  • 0 in reply to Takahiro Nishizawa
    TI__Expert 3645 points
    Hello,
    the 3.6V is a maximum value associated with the minimum value of Vin. As previously said, you can use 3.3V without a problem. This value (3.3V) is between the nominal value (3V) and the maximum (3.6V) of the minimum Vin, so I don't see any problem or issue for the device. If you need further support, you can contact me by email: a-furio@ti.com
  • 0 in reply to Alfonso Furio
    Genius 5575 points
    Thank you for your answer!


    We think that we have to set the input voltage over than 3.6V when Vin-Vout ≥ 1.
    Is this not correct? Do we have to set the input voltage 3.6V or less?
    Can we use this IC when Vin is 5V and Vout is 1.5V?

    In datasheet p.6, Vin is 2.05~6V.
    But we can't understand the definition of 3.6V.

    Best regards,
    Takahiro Nishizawa
  • 0 in reply to Takahiro Nishizawa
    TI__Expert 3645 points
    Hello,
    I will try to explain differently what we already said in the previous posts. Considering your application:
    Vin= 3.3V or 5V
    Vout=1.5V
    Iout=200mA
    You don't have any problem because you stay in the specifications. At page 6 of the D/S, in the recommended operating conditions, you can use this equation: Vin-Vout≥ 1 for Iout=350mA. The maximum (2.7V) is the worst case of the minimum input voltage to supply, and the nominal value (2.5V) is the typical value. In each case, you have to stay above the maximum value like 3.3V or 5V is fine. The important thing is to not exceed the 6V, as you also said. I hope that this time everything is clear, if you need more support contact me by email or we can schedule a call.