17W System-Level Power Reference Design for Automotive Infotainment Processor Power
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Key Document


TIDA-00746 is a 17W system-optimized SMPS design for automotive infotainment processor power. The design has been tested for and passed CISPR25 Class 5 conducted EMI  limits.  All buck converters used in this design is switching above AM band (>1.85MHz).

The design is divided into four major blocks:

  1. Front end protection:  Various protections have been implemented, such as those against positive and negative pulses (ISO7630 Pulse 1, 2a, 3a/b) through TVS, reverse terminal protection through innovative smart diode (LM74610), and battery disconnect switch with OVP protection (PFET).
  2. EMI filter: a common mode and a differential filter for conducted EMI suppression.
  3. Low EMI front end DC/DC converter: LM53635-Q1 is a switching, synchronous 3.5A buck regulator and is used as a front end DC/DC converter in this design. This 2.1 MHz part is automotive optimized and has low EMI. Apart from the spread spectrum option, the device comes in an automotive-qualified Hotrod(TM) QFN package with wettable flanks, which reduces parasitic inductance and resistance while increasing efficiency, minimizing switch node ringing, and dramatically lowering EMI.
  4. Downstream POL buck converters such as, LM26420-Q1 (Integrated dual buck), TPS57114-Q1, and TPS57112-Q1: all POL switchers used in the design switch above AM band. For high frequency noise-sensitive rails, a ferrite bead filter is used.

  • Wide-Vin front end power supply for 10W-17W automotive
  • Off-battery operation with reverse battery protection
  • Series fault protection FET with OVP at input
  • Passed CISPR25 Class 5 conducted EMI test
  • All devices have an AEC-Q100 qualified version available
  • Switching frequency: above AM band (>1.85 MHz) for all the converters used

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Schematic/Block Diagram

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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)
Vin (Min) (V)9555
Vin (Max) (V)36555
Vout (Nom) (V)
Iout (Max) (A)3.5311
Output Power (W)
TopologyBuck- SynchronousBuck- SynchronousBuck- SynchronousBuck- Synchronous

TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM26420-Q1  Dual 2 A, automotive-qualified, high-efficiency synchronous DC/DC converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM53635-Q1  2.5/3.5A, 36 V Synchronous, 2.1MHz, Automotive Step Down DC-DC Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM74610-Q1  0.48-V to 42-V, zero IQ automotive ideal diode controller  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TLVH431A-Q1  Automotive, low-voltage adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TPS57112-Q1  Automotive 2.95V to 6V, 2A, 2MHz Synchronous Buck Converter  Step-down (buck) regulators  Not Available View Design Kits & Evaluation Modules
TPS57114-Q1  Automotive 2.95V to 6V, 4A, 2MHz Synchronous Buck Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM26420-Q1 Download Download
Download Download
LM53635-Q1 Download Download
LM74610-Q1 Download Download
TLVH431A-Q1 Download Download
TPS57112-Q1 Download Download
TPS57114-Q1 Download Download

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Technical documentation

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Datasheet (3)
Title Type Size (KB) Date
PDF 5115 15 Jan 2020
PDF 2090 18 Mar 2016
PDF 1293 02 Feb 2016
User guide (1)
Title Type Size (KB) Date
PDF 1544 30 Nov 2016
Design files (4)
Title Type Size (KB) Date
ZIP 606 30 Nov 2016
ZIP 870 30 Nov 2016
PDF 45 30 Nov 2016
PDF 653 30 Nov 2016

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