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LM5149-LM25149DESIGN-CALC

LM5149/-Q1 and LM25149/-Q1 buck controller with AEF quickstart design tool

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Latest version
Version: A4
Release date: Sep 7, 2025
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LM5149_LM25149_quickstart_calculator_A4.xlsm  — 4441 K

LM5149 and LM25149 buck controller with AEF quickstart design tool

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Products
AC/DC & DC/DC controllers (external FET)
LM25149 — 42-V synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter LM25149-Q1 — 42-V automotive synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter LM5149 — 80-V synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter LM5149-Q1 — 80-V automotive synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter
Hardware development
Evaluation board
LM25149-Q1EVM-2100 — LM25149-Q1 5.5-V to 36-V, low IQ, synchronous buck DC/DC controller evaluation module LM5149-Q1EVM-400 — LM5149-Q1 evaluation module, 72-V, low-IQ, synchronous buck DC/DC controller with active EMI filter

Release Information

Welcome to the quickstart design calculator tool for the LM5149, LM5149-Q1, LM25149 and LM25149-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM(2)5149/-Q1 controller family that includes AEF. As such, the user can expeditiously arrive at an optimized design to meet the application requirements.