Four-output synchronous buck reference design for automotive telematics control units


Design files


This reference design uses an LM63635-Q1 synchronous buck converter to output either a 3.3-V or 5-V rail. The bus converter switches at 2.1 MHz, and the load converters (TPS62810-Q1) switch at 2.2 MHz. The system is designed for telematics control unit power. Easily configurable jumpers allow users to enable and disable the bus converter, load converters and load switches for up to 3-A maximum load at each output. 

  • 12-V input, bus converter with selectable 3.3-V or 5-V outputs
  • Four selectable load switch outputs with 3-A maximum load
  • All switching converters operate above 2 MHz to avoid AM band
  • Very good output ripple with and without load (<1%)
  • Built for easy testability using configurable jumpers and test points
Output voltage options PMP21939.1 PMP21939.2 PMP21939.3 PMP21939.4 PMP21939.5
Vin (Min) (V) 6 3.3 5 3.3 3.3
Vin (Max) (V) 16 5 5 5 5
Vout (Nom) (V) 3.3 3.3 3.3 1.8 1.1
Iout (Max) (A) 2.85 .4 .5 1.5 2.5
Output Power (W) 9.405 1.32 1.65 2.7 2.75
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC DC
Topology Buck- Synchronous Other Buck- Synchronous Buck- Synchronous Buck- Synchronous

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.

TIDT142.PDF (2855 K)

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

TIDM255.PDF (360 K)

Detailed schematic diagram for design layout and components

TIDM256.PDF (201 K)

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

TIDM257.PDF (182 K)

Detailed overview of design layout for component placement

TIDM259.ZIP (1104 K)

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

TIDCFN7.ZIP (2336 K)

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

TIDM258.PDF (1227 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM63635-Q13.5-V to 32-V, 3.25-A step-down voltage converter with spread spectrum

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS62810-Q1Automotive 2.75-V to 6-V, 4-A step-down converter in a 2mm x 3mm wettable-flanks QFN package

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS62810M2.75-V to 6-V, 4-A step-down converter in a 2-mm x 3-mm QFN package with -55C extended temperature

Data sheet: PDF | HTML
Auto-direction voltage translators

LSF0101Single bi-directional multi-voltage level translator

Data sheet: PDF | HTML
Load switches

TPS22968-Q12-ch, 5.5-V, 4-A, 27-mΩ, automotive load switch with adj. rise time and output discharge

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report Four-Output Synchronous Buck Reference Design for Automotive Telematics Control Oct. 11, 2019

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