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TPS62867: Performance Differences between PWM and PSM (PFM)

Shinichi Yokota
Genius 9715 points
Part Number: TPS62867
Other Parts Discussed in Thread: TPS54617, TPSM82866A

Hello,

I'd like to know about the differences in performance between PWM and PSM (Power Save Mode) (PFM) of TPS62867. What's better and what's worse?

In addition, I'd also like to know what's better and what's worse from TPS54617 in device performance if I compare the TPS62867 with the TPS54617.

I'm wondering if the TPS54617 can be replaced with the TPS62867.

Best regards,
Shinichi Yokota

  • 0
    TI__Guru*** 148810 points

    Hi Yokota-san,

    What are your design requirements and application, so that I can recommend the best device?

    The difference between PFM and PWM only occurs at lower load currents, where the device enters PFM.  At higher currents, operation is the same.  Primarily, PFM is used to obtain increased efficiency (at these lower load currents) by not constantly switching.  Skipping switching pulses is more efficient, but but slightly increases the ripple, slightly raises the output voltage, and worsens the transient response.  PFM also operates with a lower frequency.

    The TPS54617 is very old, so I would recommend a newer device.  TPS62867 is a good choice, as well as the module version TPSM82866A.  Newer devices offer smaller size, higher integration (fewer external components), usually lower cost, and usually better efficiency.  Using newer devices (which are mostly using 300mm wafers on the latest process technologies) obtains better continuity of supply over the long term.

    Thanks,

    Chris