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TPS7B91: SPICE Model

Antenna_Head
Genius 12660 points
Part Number: TPS7B91
Other Parts Discussed in Thread: TPS7B92

Tool/software:

Team-

Would be really helpful to have a SPICE model for the TPS7B91.

Is one in the works?

Would plan to use it in TINA or QSPICE.

Thanks, -Steve

  • 0
    TI__Genius 12010 points

    Hi Steve,

    We don't have a model for the TPS7B91 yet, but there is a released unencrypted model for the TPS7B92. The main difference there is the 300mA current limit instead of the TPS7B91's 150mA. I'd expect that model to import fine into TINA or QSPICE. 

    Best Regards,

    Alex Davis

  • 0 in reply to Alex Davis
    TI__Genius 12660 points

    Thanks, I downloaded the model.

    It's for a fixed 3.3V output.  I need the 5V part.

    Looking at the model text, I would suggest for these fixed output devices you simply make the output voltage a parameter- that way you don't have to release a model for every single version.

    I think I can figure out how to modify it for 5V, but some hints would save some time, but it appears these two lines are setting the output voltage:

    R_U1_R1         U1_N222934 U1_N287997  168k 

    R_U1_R2         U1_N283278 U1_N222934  30k

    It's pretty straight forward to give the TPS7B9x sub circuit a PARAMS: VOUT = 5 and then compute R1 inside the model.

    There are no notes/header at all describing what's modeled, or what's not... very odd, usually these models are better documented.  Is a new version on the way?

  • 0 in reply to Antenna_Head
    TI__Genius 12660 points

    Thanks, I downloaded the model.

    It's for a fixed 3.3V output.  I need the 5V part.

    Looking at the model text, I would suggest for these fixed output devices you simply make the output voltage a parameter- that way you don't have to release a model for every single version.

    I think I can figure out how to modify it for 5V, but some hints would save some time, but it appears these two lines are setting the output voltage:

    R_U1_R1         U1_N222934 U1_N287997  168k 

    R_U1_R2         U1_N283278 U1_N222934  30k

    It's pretty straight forward to give the TPS7B9x sub circuit a PARAMS: VOUT = 5 and then compute R1 inside the model.

    There are no notes/header at all describing what's modeled, or what's not... very odd, usually these models are better documented.  Is a new version on the way?

  • 0 in reply to Antenna_Head
    TI__Genius 12660 points

    Attached is the parameterized TINA macro with adjustable VOUT.  If you give me some hints on how to adjust the current limit that can be implemented, too.

    TPS7B92.TSM

  • 0 in reply to Antenna_Head
    TI__Genius 12660 points

    Also, are there any plans for a 2.5V version of this device?  It goes from 1.8 to 3.3- 2.5 would be helpful.  Feel free to email me if needed.

  • 0 in reply to Antenna_Head
    TI__Genius 12010 points

    Hi Steve,

    Thanks for sending the macro! We have plans to extend and improve our models in the future, but I can't provide a specific timeline on that effort, unfortunately. Parameterization along the lines of what you propose may be something we incorporate into future modeling efforts - it would certainly be more convenient to allow different output voltages to be configured that way. 

    I'm not aware of plans for a 2.5V version of the TPS7B91 at present. I've passed on the request to our systems and marketing team to let them know there's interest, however. 

    Best Regards,

    Alex Davis