LT1170 example circuit for +12V to -5V

Hello lightelligencespencer,

Referring from the Figure on page 14 of the datasheet, Output voltage is set by the ratio of R1 to R2. R3 and C2 provides frequency compensation. 

Kindly refer to the Application Note 19 — LT1070 Design Manual. This manual contains a comprehensive discussion of the LT1070 and the external components as well as the complete formulas for calculating the values of these components. The manual can also be used for the LT1170.

AN19 - LT1070 Design Manual (analog.com)

I also attached below a sample inverting buck-boost circuit which outputs -5V.

LT1170_buckboost.asc

Regards,

Nino

Hi Nino, Thanks for your helpful answer! Much appreciated.

Hi Nino, When running a load step for the spice simulation you provided, I don't find that the regulator is maintaining the output voltage under high load. Could you help me understand what I might be doing wrong? Thanks.LT1170_buckboost_ninoADI_loadstep.asc