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


Design files


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
Output voltage options TIDA-00746.1 TIDA-00746.2 TIDA-00746.3 TIDA-00746.4
Vin (Min) (V) 9 5 5 5
Vin (Max) (V) 36 5 5 5
Vout (Nom) (V) 5 3.3 1.2 1.2
Iout (Max) (A) 3.5 3 1 1
Output Power (W) 17.5 9.9 1.2 1.2
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC
Topology Buck- Synchronous Buck- Synchronous Buck- Synchronous 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.

TIDUCP5.PDF (1544 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


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


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


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: PDF | HTML
Buck converters (integrated switch)

LM53635-Q13.5-A, 36-V synchronous, 2.1-MHz, automotive step-down DC-DC converter

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74610-Q10.48-V to 42-V, zero IQ automotive ideal diode controller

Data sheet: PDF | HTML
Shunt voltage references

TLVH431A-Q1Automotive, low-voltage adjustable precision shunt regulator

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide TIDA-00746 Test Results Nov. 30, 2016

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