LM25141DESIGN-CALC

LM25141-Q1 controller quickstart design tool

LM25141DESIGN-CALC

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Overview

Welcome to the LM25141-Q1 quickstart calculator design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM25141-Q1 42-V synchronous buck DC/DC controller with low IQ. As such, the user can expeditiously arrive at an optimized design to meet the application requirements

Features

Determine buck inductance and input and output capacitances
Select components for soft-start, hiccup-mode restart, OCP, switching frequency and output voltage setpoint(s)
Optimize compensation values and pole/zero placement in terms of control loop stability using crossover frequency as a performance metric
Inspect regulator efficiency, solution size and component power dissipations with ambient temperature as a parameter
Review auto-generated schematic and BOM list
Determine EMI filter components and spread spectrum modulating frequency

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Downloads

Calculation tool

LM25141DESIGN-CALC — LM25141-Q1 controller quickstart design tool

Supported products & hardware

Products

AC/DC & DC/DC controllers (external FET)

LM25141 — Low Iq, Wide Input Range Synchronous Buck Controller

LM25141-Q1 — Automotive 2.2-MHz, low-IQ synchronous buck controller with frequency spread spectrum

Hardware development

Reference design

PMP21107 — Wide input synchronous buck converter reference design with frequency spread spectrum

Evaluation board

LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Download options

LM25141DESIGN-CALC — LM25141-Q1 controller quickstart design tool

close

Latest version

Version: A6

Release date: Mar 6, 2025

open-in-new

View all versions

download

LM25141-Q1_quickstart_calculator_revA6.xlsm — 1749 K

MD5 checksum

Products

AC/DC & DC/DC controllers (external FET)

LM25141 — Low Iq, Wide Input Range Synchronous Buck Controller

LM25141-Q1 — Automotive 2.2-MHz, low-IQ synchronous buck controller with frequency spread spectrum

Hardware development

Reference design

PMP21107 — Wide input synchronous buck converter reference design with frequency spread spectrum

Evaluation board

LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Release Information

Welcome to the quickstart design tool for the LM25141 and LM25141-Q1 synchronous buck controller family. This standalone tool facilitates and assists the power-supply engineer with the design of a DC/DC buck regulator with external MOSFETs. As such, the user can expeditiously arrive at an optimized design to meet the application requirements.

Additional resources you might need

Calculation tool

LM25141DESIGN-CALC — LM25141-Q1 controller quickstart design tool

Supported products & hardware

Products

AC/DC & DC/DC controllers (external FET)

LM25141 — Low Iq, Wide Input Range Synchronous Buck Controller

LM25141-Q1 — Automotive 2.2-MHz, low-IQ synchronous buck controller with frequency spread spectrum

Hardware development

Reference design

PMP21107 — Wide input synchronous buck converter reference design with frequency spread spectrum

Evaluation board

LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Download options

LM25141DESIGN-CALC — LM25141-Q1 controller quickstart design tool

close

Latest version

Version: A6

Release date: Mar 6, 2025

open-in-new

View all versions

download

LM25141-Q1_quickstart_calculator_revA6.xlsm — 1749 K

MD5 checksum

Products

AC/DC & DC/DC controllers (external FET)

LM25141 — Low Iq, Wide Input Range Synchronous Buck Controller

LM25141-Q1 — Automotive 2.2-MHz, low-IQ synchronous buck controller with frequency spread spectrum

Hardware development

Reference design

PMP21107 — Wide input synchronous buck converter reference design with frequency spread spectrum

Evaluation board

LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Release Information

Welcome to the quickstart design tool for the LM25141 and LM25141-Q1 synchronous buck controller family. This standalone tool facilitates and assists the power-supply engineer with the design of a DC/DC buck regulator with external MOSFETs. As such, the user can expeditiously arrive at an optimized design to meet the application requirements.

Technical documentation

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	Type	Title		Date
	EVM User's guide	LM5141-Q1 EVM User’s Guide (Rev. A)		Jan 10, 2018

Related design resources

Hardware development

EVALUATION BOARD

LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Reference designs

REFERENCE DESIGN

PMP21107 — Wide input synchronous buck converter reference design with frequency spread spectrum

LM25141DESIGN-CALC

LM25141-Q1 controller quickstart design tool