TIDA-01524

Automotive High Efficiency Power Front End and Multi-Phase Processor Supply Reference Design

TIDA-01524

Design files

Overview

This processor supply reference design is an automotive power solution for use in highperformance, single-core-voltage application processors in advanced driver assistance systems (ADASs). This design can support core supply currents up to 10 A at 0.9 V. The design can also operate with a wide input voltage range, withstand reverse battery conditions, and support start-stop and cold-crank down to a 3.5-V input with an undisturbed output. The sub-AM band switching frequency of the power front end improves efficiency and reduces board temperatures when compared to a power front end with faster switching frequency. The multiphase configuration and integration of supplies enables lower electromagnetic interference (EMI) and higher efficiency. This reference design also provides results for conducted emissions tests for CISPR 25 Class 5.

Features
  • 5A integrated, 400kHz synchronous wide input voltage buck DC/DC converter with spread spectrum
  • Supplying 10A at 0.9V to core-voltage rail of application processor
  • Operating range 3.5 - 36V, supports start-stop and cold-crank
  • Interleaved four-phase core-voltage supply minimizing ripple, EMI and inductor size
  • Smart diode reverse battery protection for minimum voltage drop (typical 20mV)
  • Small switched cap boost for 5V CAN supply reduces solution size and BOM cost

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.

TIDUDD9.PDF (15219 K)

Reference design overview and verified performance test data

TIDRUD0.PDF (322 K)

Detailed schematic diagram for design layout and components

TIDRUD1.PDF (58 K)

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

TIDRUD2.PDF (59 K)

Detailed overview of design layout for component placement

TIDRUD4.ZIP (1102 K)

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

TIDCE74.ZIP (541 K)

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

TIDRUD3.PDF (566 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM26420-Q1Dual 2 A, automotive-qualified, high-efficiency synchronous DC/DC converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

LMS3655-Q15.5-A, 36-V synchronous, 400-kHz, step-down converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Charge pumps (inductorless)

LM27752.7-V to 5.5-VIN, 200-mA output current, 5-V fixed output voltage doubler

Data sheet document-pdfAcrobat PDF open-in-new HTML
Ideal diode/ORing controllers

LM74700-Q13.2-V to 65-V, 80-uA IQ automotive ideal diode controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Multi-channel ICs (PMICs)

LP87561-Q1Automotive multiphase 16-A buck converter with integrated switches

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Automotive High-Efficiency Power Front End and Multi-Phase Processor Supply Oct. 12, 2017

Related design resources

Hardware development

EVALUATION BOARD
AUTOCRANKSIM-EVM Simulator for automotive cranking pulses evaluation module

Reference designs

REFERENCE DESIGN
PMP7233 Cranking Simulator Reference Design for Automotive Applications TIDA-00530 Automotive Power Reference Design for Low Power TDA3x Based Systems TIDA-00699 Front End Power Supply Reference Design with Cold Crank Operation, Transient Protection, EMI Filter

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