TPS53632: TPS53632 minimum Vin requirement

Part Number: TPS53632

Hello,

In one of our battery powered device (3~4.2V)

if we want to use the TPS53632 for our CPU core voltage (0.95v / 50A) and only use 2-phase / 800kHz configuration, assume power stage drive voltage is external 5V, what’s the minimum power VIN requirement for TPS53632?

Thanks,

Zane

  • Hi,

    See the limitation of input voltage below.

  • Hi Derrick,

    Thanks for your quick response.

    According to "The minimum input voltage is lower for lower freq and/or lower output voltage", what about the output voltage is 0.95V and freq is 800kHz, would you help me to find out what's the minimum input voltage for that based on your calculation?

    Thanks,

    Zane

  • Hi Zane,

    if so, then it's approximately 3 times output voltage. 0.95*3 = 2.85V. The battery power(3V~4.2V) could be sufficient.

  • Hi Derrick,

    Thanks for your explanation.

    Just for curious, if using 3-phase, will you use different estimation to calculate minimum Vin?

    I have another question. Is the TPS53632 a digital DC/DC controller or an analog controller w/ digital wrapper?

    Thanks,

    Zane

  • Hi Zane,

    Based on the calculation, whether 2-phase or 3-phase operation the input voltage could be lower than 3V after considering the Toff limitation.

    But there is another rule describe in the datasheet “The input voltage (VVIN) does not include a UVLO function, so the circuit runs with power inputs as low as approximately 3 x VOUT”

    So, it should be the similar to 2-phase or 3-phase operation.

     

    TPS53632 is not a full digital controller which embeds a micro processor or something. It’s an analog control loop with digital NVM to tweak parameters.

  • Hi Derrick,

    Thanks for your details.

    We were hesitating to use TPS53632 in our application due to "7.3.15 Input Voltage Limits". After go over your explanation, we have more confidence to use this part.

    May I know what that Toff limitation is? 

    Thanks,

    Zane

  • Hi Zane,

    Which means low side MOSFET turn-on duration. Device needs this time frame to execute some internal mechanism.

  • Hi Derrick,

    Thanks for your quick reply, which is very clear.

    I have another question, regarding the power stage CSD95372A used in TPS53632 datasheet page 23 reference application.

    I would open another question, and close this question.

    Thanks,

    Zane