Linear Technology LTspice IV User Guide

About this manual

This document introduces updates for LTspice IV, a high-performance SPICE simulator designed by Linear Technology. It highlights new 'How-To' videos on defining transformers using mutual inductance statements and adding third-party component models to simulations.

The guide also details the use of the .STEP command for performing repeated analysis across parameter ranges efficiently. Additionally, it lists available macro models for various power products and provides links to download demonstration circuits for switching regulators, linear regulators, and battery chargers.

What's inside

• What's New with LTspice IV
• Using Transformers in LTspice IV
• Adding Third-Party Models
• New LTspice Device Macro Models
• How to Use the .STEP Command
• LTspice IV Demo Circuits

Frequently asked questions

How do I add a third-party model in LTspice?

Third-party models are described in .MODEL and .sUBCKT statements.

What is the primary purpose of LTspice IV?

It is a high performance SPICE simulator, schematic capture and waveform viewer specifically designed to speed up the process of power supply design.

How much faster can LTspice IV simulate switching regulators compared to other SPICE simulators?

LTspice IV allows one to view waveforms for most switching regulators in minutes, whereas it takes hours for other SPICE simulators.

What is the input voltage range for the LT3507A regulator model included with the software?

The LT3507A is a triple monolithic step-down regulator that includes an LDO.