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PMP21795

Automotive EMI and thermally optimized synchronous buck converter reference design

Design files

PMP21795

Design files

Overview

This reference design is an EMI and thermally optimized synchronous buck converter for automotive applications. The circuit is powered from the nominal 12-V battery to provide an output voltage of 3.3 V at 8 A. The design uses a synchronous buck controller operating at a switching frequency of 440 kHz. Forced pulse width modulation or diode emulation mode is jumper selectable. Frequency dithering is used to improve the EMI performance.

Features
  • EMI and thermally optimized for improved system performance
  • 440 kHz switching frequency, which is below the AM band
  • Jumper selectable diode emulation or forced PWM
  • Selectable frequency dithering improves EMI performance
  • Compact power stage and controller layout for small solution size
Output voltage options PMP21795.1
Vin (Min) (V) 4.5
Vin (Max) (V) 20
Vout (Nom) (V) 3.3
Iout (Max) (A) 8
Output Power (W) 26.4
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

download Test report — PMP21795
TIDT060.PDF (2071 KB)

Test results for the reference design, including efficiency graphs, test prerequisites and more

download Assembly drawing — PMP21795
TIDRYF9.PDF (135 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — PMP21795
TIDRYF8.PDF (102 KB)

Complete listing of design components, reference designators, and manufacturers/part numbers

download CAD/CAE symbol — PMP21795
TIDRYG1.ZIP (1031 KB)

Files used for 3D models or 2D drawings of IC components

download Gerber file — PMP21795
TIDCF65.ZIP (525 KB)

Design file that contains information on physical board layer of design PCB

download PCB layout — PMP21795
TIDRYG0.PDF (1084 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — PMP21795
TIDRYF7.PDF (199 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

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

LM5141-Q1 — Automotive wide-input 2.2-MHz low-IQ synchronous buck controller

Data sheet: PDF | HTML

Start development

Software

Calculation tool

LM5141DESIGN-CALC — LM5141-Q1 controller quickstart design tool

Welcome to the LM5141-Q1 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM5141-Q1 65-V synchronous buck DC/DC controller with low IQ. As such, the user can expeditiously arrive at an optimized design (...)
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5141 — Low Iq, Wide Input Range Synchronous Buck Controller LM5141-Q1 — Automotive wide-input 2.2-MHz low-IQ synchronous buck controller
Hardware development
Reference design
PMP15019 — Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5141-Q1 PMP15041 — 25W Automotive Start-Stop Reference Design Operating at 2.2 MHz PMP20682 — Synchronous Buck Converter for Automotive Cluster Reference Design PMP20818 — 137W Holdup Converter for Storage Server Reference Design PMP21795 — Automotive EMI and thermally optimized synchronous buck converter reference design PMP30339 — Automotive Synchronous Buck With 3.3V @ 12.0A Reference Design TIDA-01413 — ADAS 8-Channel Sensor Fusion Hub Reference Design with Two 4-Gbps Quad Deserializers
Evaluation board
LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module
Download options

LM5141DESIGN-CALC — LM5141-Q1 controller quickstart design tool

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Version: A6
Release date: Mar 6, 2025
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LM5141-Q1_quickstart_calculator_revA6.xlsm  — 1725 K

LM5141/-Q1 controller quickstart design tool

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Products
AC/DC & DC/DC controllers (external FET)
LM5141 — Low Iq, Wide Input Range Synchronous Buck Controller LM5141-Q1 — Automotive wide-input 2.2-MHz low-IQ synchronous buck controller
Hardware development
Reference design
PMP15019 — Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5141-Q1 PMP15041 — 25W Automotive Start-Stop Reference Design Operating at 2.2 MHz PMP20682 — Synchronous Buck Converter for Automotive Cluster Reference Design PMP20818 — 137W Holdup Converter for Storage Server Reference Design PMP21795 — Automotive EMI and thermally optimized synchronous buck converter reference design PMP30339 — Automotive Synchronous Buck With 3.3V @ 12.0A Reference Design TIDA-01413 — ADAS 8-Channel Sensor Fusion Hub Reference Design with Two 4-Gbps Quad Deserializers
Evaluation board
LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Release Information

Welcome to the quickstart design tool for the LM5141 and LM5141-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 discrete 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
* Test report Automotive EMI and Thermally Optimized Synchronous Buck Converter Ref Design Dec 21, 2018

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