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TPSM846C23: Alternative part for TPSM846C23

CHIN HONG OO
Prodigy 40 points
Part Number: TPSM846C23
Other Parts Discussed in Thread: TPS546A24A, TPSM8D6C24

Hi Admin/Expert, 

May i know what is the part status or lead time for TPSM846C23?

And what is the best alternative part for TPSM846C23 for design requirement as listed as below:

  • Input voltage: 5V or 12V
  • Min output voltage is 0.35V
  • Maximum output current is 8A
  • Output Voltage Accuracy as Tight as 0.5%~1%
  • Features required: PMBUS, voltage margining, differential remote sense
  • Part available
  • Best to have integrated switch or inductor

Thanks.

  • 0
    TI__Guru 56985 points

     

    This Engineer to Engineer (E2E) support forum is intended to provide technical support.  For questions about status, availability or lead times, I would recommend contacting TI's customer support - https://ticsc.service-now.com/ 

    The TPSM846C23 is in production status.

    For an alternate device for a 10A application, you could consider the integrated FET TPS546A24A which provides a large list of supported PMBus commands including telemetry, voltage margining and differential remote sense.

    For integrated Inductor Modules, the TPSM8D6C24 is a newer, dual output / stackable 2, 3 or 4phase module with PMBus, functionally comparable to two TPSM846C23 modules.

    Both the TPS546A24A and TPSM8D6C24 will require PMBus programming to lower the VOUT_MIN value from 0.5V to 0.35V to support output voltages down to 0.35V.  This lower VOUT_MIN can be stored to NVM and recovered after a power cycle.

  • 0 in reply to Peter James Miller
    Prodigy 40 points

    Hi Peter James Miller, 

    Thanks for your feedback.

    I'm interested on TPSM8D6C24.

    If talking about setting low output voltage as 0.35V, may i know what is the operation/method different between TPSM846C23 VS TPSM8D6C24? Both also need to set via PMBUS programming right?

    Any specific technical disadvantage of TPSM8D6C24 compared to TPSM846C23?

    Thanks.

  • 0 in reply to CHIN HONG OO
    TI__Guru 56985 points

     

    For the TPSM846C23, the process for setting the output voltage to 0.35V is a little simpler because the default VOUT_MIN value is programmed to 0.35V, so only VOUT_COMMAND needs to be updated.  Additionally, the TPSM846C23 always boots to the VOUT_COMMAND and VOUT_MIN values stored in NVM, so there is no additional steps to ensure those settings are retained from power up to power-up.

    Use WRITE WORD to set VOUT_COMMAND to 0.35V

    Use SEND BYTE to execute STORE_USER_ALL to store the updated VOUT_COMMAND to NVM.

    The TPSM8D6C24 requires a few additional steps since VOUT_MIN defaults to 0.5V and is programmed by pin-strap programming by default.  In this case, VOUT_MIN should be set to 0.35V, VOUT_COMMAND is then set to 0.35V (ideally VOUT_MIN is set a few LSB values below the intended VOUT_COMMAND value)

    Then, to prevent those values from being over-written by pin strapping on the next power cycle, write to the PIN_DETECT_OVERRIDE command with a 0 in the "VOUT" bit so that VOUT_MIN, VOUT_MAX and VOUT_COMMAND are all loaded from NVM on the next power cycle.

    Use WRITE WORD to set VOUT_MIN to 0.35V

    Use WRITE WORD to set VOUT_COMMAND to 0.35V

    Use WRITE WORD to set PIN_DETECT_OVERRIDE "VOUT" bit to b'0

    You can clear other PIN_DETECT_OVERRIDE bits at this time, to force other parameters, such as compensation, switching frequency and current limit, are loaded from NVM as well.

    Use SEND BYTE to execute STORE_USER_ALL to store the updated VOUT_COMMAND to NVM.

    Other than the increased steps required to change VOUT_MIN and PIN_DETECT_OVERRIDE, and the fact that the TPSM8D6C24 includes 2 integrated inductor modules into a single device, no. 

    The TPSM8D6C24 is an updated version of the TPSM86C23 module with additional pin programming and PMBus command support.  It also includes a fully internal and PMBus programmable output voltage (no exteternal VOUT_ADJ resistor) and compensation, eliminating 7 external feedback components and making the feedback network less sensitive to noise.

    The TPSM8D6C24 has slightly fewer pin programmable PMBus addresses, supporting 32 addresses from 0x10 (16d) to 0x2F (47d) where the TPSM856C23 supports addresses from 0x00 (0d) to 0x3F (63d)