PMP21795

Automotive EMI and thermally optimized synchronous buck converter reference design

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.

TIDT060.PDF (2071 K)

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

TIDRYF7.PDF (199 K)

Detailed schematic diagram for design layout and components

TIDRYF8.PDF (101 K)

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

TIDRYF9.PDF (134 K)

Detailed overview of design layout for component placement

TIDRYG1.ZIP (1031 K)

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

TIDCF65.ZIP (525 K)

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

TIDRYG0.PDF (1083 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

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

LM5141-Q1Automotive 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
Evaluation board
LM5141QRGEVM LM5141QRG Synchronous Buck Converter Evaluation Module
Software
Calculation tool
LM5141DESIGN-CALC LM5141-Q1 controller quickstart design tool

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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