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


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

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
(Output Voltage 5)
Vin (Min) (V)63.353.33.3
Vin (Max) (V)165555
Vout (Nom) (V)
Iout (Max) (A)
Output Power (W)9.4051.321.652.72.75
TopologyBuck- SynchronousOtherBuck- SynchronousBuck- SynchronousBuck- Synchronous

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM63635-Q1  3.5-V to 32-V, 3.25-A step-down voltage converter with spread spectrum  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LSF0101  Single bi-directional multi-voltage level translator  Voltage level translators  Sample & Buy View Design Kits & Evaluation Modules
TPS22968-Q1  2-ch, 5.5-V, 4-A, 27-mΩ, automotive load switch with adj. rise time and output discharge  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS62810-Q1  Automotive 2.75-V to 6-V, 4-A step-down converter in a 2mm x 3mm wettable-flanks QFN package  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM63635-Q1 Download
LSF0101 Download Download
Download -
TPS22968-Q1 Download
TPS62810-Q1 VQFN-HR (RWY)| 9 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2784 11 Oct 2019
Design files (6)
Title Type Size (KB) Date
ZIP 2336 11 Oct 2019
ZIP 1104 11 Oct 2019
PDF 1227 11 Oct 2019
PDF 182 11 Oct 2019
PDF 201 11 Oct 2019
PDF 360 11 Oct 2019

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