This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPSM53602: Output voltage 1.1V or 1.2V

Part Number: TPSM53602
Other Parts Discussed in Thread: TPSM53603, , TPSM82822, TPS82085

Hi team,

I get a WEBENCH alert at following configuration:
Vin 4.1V -5.5V
Vout 1.2V (or 1.1V)
Iout 1A
WEBENCH Power Designer reports:The TPSM53602 device may not be stable when operating under PFM Mode

With Iout = 2A: I get the WEBENCH message that the design cannot be created:
Your preferred device does not work with the inputs you selected.
This design is not stable due phase margin either smaller than 35 or greater than 120.

But according to the data sheet, this configuration should work, right?

(With TPSM53603 I get the same messages)

Best Regards

  • Hi Dieter,

    The datasheet has lab measurements using the EVM for 5V input / 1V output. In your design conditions you are running between 4.1V - 5V. If you were to change the Vin_min and Vin_max to 5V - 5.5V the simulation will converge with a stable design. Again these simulation are based on calculated and theoretical values.

    I would suggest taking a TPSM53602EVM and testing for your application. It may turn out that at such a low output voltage, you will have large output capacitance that will result in a lower cross-over frequency and PM below standard 45-50. 

    An alternative power module that can meet your requirement is the TPSM82822 and the TPSM82084.



  • Hi Jimmy,

    we start our design with TPS82085

    Thanks & Regards