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Solutions Search - LTspice

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.

Download LTspice IV

Please send questions or comments to ltspice@linear.com

LTspice: SOAtherm Tutorial

Dan Eddleman - Senior Applications Engineer Oct 8th 2014
Verifying that a Hot Swap design does not exceed the capabilities of a MOSFET is a challenge at high power levels. Fortunately, thermal behavior and SOA may be modeled in circuit simulators such as LTspice IV® . The SOAtherm-NMOS symbol included in LTspice contains a collection of MOSFET thermal models developed by Linear ...

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LTspice: SAR ADC Driver Interface

Kris Lokere - Signal Chain Applications Apr 3rd 2014
  High-performance SAR ADCs can offer amazing dynamic range and linearity at faster and faster sample rates. But how do you design the amplifier and interface at the analog inputs? LTspice IV can help. This video shows how to use LTspice to simulate the analog input interface of high-performance SAR ADCs. We will look ...

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LTspice IV: AC Analysis

Simon Bramble - Field Applications Engineer Feb 13th 2014
  Sometimes the frequency response of a circuit is more important than looking at the individual voltages or currents at a specific part of the schematic. LTspice IV can help you achieve this with its AC analysis function. This video shows you how to perform a basic AC analysis in LTspice as well as point out some capabilities ...

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LTspice IV: Stability of Op Amp Circuits

Kris Lokere - Signal Chain Applications Nov 6th 2013
  We all know that feedback circuits can oscillate. We may even know some tricks of how to fix it. But wouldn’t it be nice if our simulation tool could show us exactly what is happening, and why? This video illustrates how to use the .AC analysis to look at open loop gain and phase of operational amplifier ...

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LTspice IV: Noise Simulations

Tyler Hutchison - Applications Engineer May 7th 2013
  LTspice IV can perform frequency domain noise analysis which takes into account shot, thermal and flicker (1/f) noise. The resulting noise density (in units of volts per square root hertz) can then be plotted to aid in circuit analysis and understanding. This video covers how to setup a .noise simulation in LTspice ...

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LTspice IV: Evaluating Electrical Quantities

Gabino Alonso - Strategic Marketing Apr 19th 2012
  Utilizing LTspice IV waveform viewer to analyze a circuit and perform basic measurements is very useful. However there are times where you need to evaluate a circuit with a numerical analysis. For these circumstances .MEASURE statements can be very powerful in evaluating user-defined electrical quantities. .MEASURE ...

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LTspice IV: Stepping Parameters

Gabino Alonso - Strategic Marketing Feb 9th 2012
  Plotting voltages or currents in a LTspice IV simulation is important but so is varying a parameter in a device or model so that you can compare performance and develop your circuit intuition. There are two ways to examine a circuit by changing the value of a parameter. You can either manually enter each value then ...

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LTspice IV: Adding Third-Party Models

Gabino Alonso - Strategic Marketing Oct 5th 2011
  LTspice IV supplies many device models to include discrete like transistors and MOSFET models. Nevertheless, there are also many third-party models from manufacturers that are available that you could add to your LTspice IV circuit simulations. These third-party SPICE models are described with a .MODEL and .SUBCKT ...

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LTspice IV: Using Transformers

Gabino Alonso - Strategic Marketing Aug 25th 2011
  Transformers and coupled inductors are key components in many switching regulator designs to include flyback, forward and SEPIC converters. They perform critical function in providing an isolation barrier, enabling high step-down or step-up ratios and accommodating multiple or inverting outputs. Although it is possible ...

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LTspice IV: Waveform Viewer

Gabino Alonso - Strategic Marketing Jul 22nd 2011
  LTspice IV includes an integrated waveform viewer that in combination with the schematic editor provides an easy way to display and review simulation data. This means that if you click on an object in the schematic editor, the voltage on that wire or current through that component will be plotted on a waveform viewer ...

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LTspice IV: Schematic Editor

Gabino Alonso - Strategic Marketing Apr 28th 2011
  Unlike many schematic capture programs, LTspice IV schematic editor was written explicitly for running SPICE simulations. This means that if you click on an object, the default behavior is to plot the voltage on that wire or current through that component, not select the object for editing. Hence, the first couple ...

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LTspice IV: Overview

Gabino Alonso - Strategic Marketing Mar 4th 2011
  LTspice IV is a high performance Spice III 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 ...

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