LTSpice is a program that acts as a virtual electronics laboratory. You can use the LTSpice program not only to create electronic circuits on your computer, but also to simulate (“run”) the circuits, use virtual probes to make electronic measurements, and even perform calculations on measured quantities like voltage and current
from analog devices
LTspice IV is a high performance SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators. Our enhancements to SPICE have made simulating switching regulators extremely fast compared to normal SPICE simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. Included in this download are LTspice IV, Macro Models for 80% of Linear Technology’s switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.
https://www.youtube.com/watch?v=3nH3ZcmMKNs
https://www.arxterra.com/introduction-to-lt-spice-iv-with-examples/