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WEBENCH® Tools/LT1054: LT1054 - Spice Model Request

Rohith K Kiruba
Prodigy 220 points
Part Number: LT1054

Tool/software: WEBENCH® Design Tools

Hello,

I am planned to use LT1054 IC in my design. Request you to kindly share SPICE model for the same.

Thanks and Regards,

Rohith K

  • 0
    TI__Guru* 78400 points

    Hi Rohith,

    Thank you for considering the LT1054.  Unfortunately the SPICE model of this device is not available. It is just a simple switched capacitor device and wish you could build a model based on the block diagram.  

    If you have other application issues with the device, please feel free to let us know.

    Thanks,

    Youhao Xi,  Applications Engineering

  • 0 in reply to Youhao Xi
    Prodigy 220 points

    Dear Youhao Xi,

    Good Afternoon, My requirement is to generate -9V from +12V DC. I have used LTspice simulation tools and simulated LT1054.

    Results what i have achieved is as follows

    Condition 1: When FB pin is left open Input 9V is given output voltage is -8.8V V at 100mA load. Where output voltage falls from 0V to -9V at 5mS time period.

    Condition 2: When FB pin is connected with 220K and 20K Input 12V is give output voltage is 0V .

    Simulation results:

    Can you please let me know why Output voltage is not available when i connect a feedback voltage.

  • 0 in reply to Rohith K Kiruba
    TI__Guru* 78400 points

    I am not sure if the LT1054 mode is correct.  Like I said, this is a simple circuit and it may be faster to get the IC and build the board to do bench eval.

    Referring to the datasheet, a 0.002uF capacitor is recommended to be placed in parallel to R2.