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Original question:

TPS7A88-Q1: Additional pad connection for the automotive part

TPS7A88: TPS7A8801RTJR - Simulation Query

vinay kumar
Prodigy 150 points
Part Number: TPS7A88


Hi Team, 

Is there any tool available that supports power simulation for this IC?

Regards,
Vinay

  • 0
    TI__Genius 15240 points

    Hi Vinay,

    We do have a PSpice model available for this device that models basic transient performance of the LDO, including voltage drop and input current. That model could be used for a basic power analysis. The basic model doesn't model the error amplifier bandwidth or device output impedance, so load transient results may not be identical to the physical device.

    Best Regards,

    Alex Davis

  • 0 in reply to Alex Davis
    Prodigy 150 points

    Hi Alex,

    I have completed designing the LDO regulator. Please find the attached regulator section for review and also please let me know if anything needs to be changed w.r.to design 
    Part Number: TPS7A8801RTJR

    LDO_REGULATOR_DESIGN.pdf

    Regards,
    Vinay

  • 0 in reply to vinay kumar
    TI__Genius 15240 points

    Hi Vinay,

    With 3.3V in and 1A of load on both the 1.2V and 1.8V outputs, power dissipation in this design will be 3.6W, and may cause the design to exceed the recommended 125°C junction temperature at ambient temperatures above around 6°C. 

    If 1A output is required on both 1.2V and 1.8V outputs and no lower-voltage supply is available for the input in your design, I'd suggest using two separate LDOs to help split the power dissipation up and reduce operating temperature.

    Best Regards,

    Alex Davis

  • 0 in reply to Alex Davis
    Prodigy 150 points

    Hi Alex,

    The 1.8V OUT1 rail requires 100mA, and the 1.2V OUT2 rail requires approximately 688mA.
    Should separate LDOs be used for these two voltage rails considering their respective output current requirements?


    Regards,
    Vinay

  • 0 in reply to vinay kumar
    TI__Genius 15240 points

    Hi Vinay,

    With the reduced output current in your application, this should be okay. Using the 33°C/W RθJA value from the datasheet, the junction temperature should remain within the recommended range up to an ambient temperature of around 72°C with these load currents. 

    Best Regards,

    Alex Davis