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LM25139-DESIGN-CALC

LM25139 Quick Start Design Calculator

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Latest version
Version: LM25139-CALC
Release date: Oct 10, 2025
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LM25139_calculator.xlsm  — 3982 K

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Products
AC/DC & DC/DC controllers (external FET)
LM25139-Q1 — Automotive 42V input low-Iq buck controller with advanced spread spectrum for low EMI

Release Information

This excel file contains the component calculator for use with the LM25139 and LM25139-Q1 controllers. Please download this calculator to estimate stability and efficiency for your application conditions. Macros are recommended to be enabled to easily change compensation component values.

What's new

  • Calculates appropriate components for the LM25139 and LM25139-Q1
  • Includes stability and efficiency estimator
  • Checks the application for validity according to the datasheet
  • Provides a quick overview for the chosen application design with the BOM & Schematic page