50W System-Level Power Reference Design for Automotive Infotainment Systems
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Key Document


TIDA-00744 is a 50-W system-level SMPS design for mid-power automotive infotainment systems.
The design has protections, such as load dump through TVS (ISO pulse testing), as well as reverse voltage (innovative smart diode with very low Iq) protection. Furthermore, all the controllers (boost and dual bucks) are in SYNC for EMI-optimized design.
The design is divided into four major blocks:

  1. Protection: Reverse battery protection through efficient smart diode and automotive transient protections through TVSs
  2. EMI filter: A differential filter for conducted EMI suppression
  3. Preboost: Efficient low-cost nonsynchronous preboost design for 50-W applications. The output is maintained at 10 V and when Vin > Vout (programmed boost out), the output follows the input and bypass operation is achieved (through a conducting PFET when VIN > programmed 10-V boost output).
  4. Dual buck controller: 2.2-MHz switching for AM band avoidance, as well as small-size solution. Supports two outputs; 5 V at 5 A and 3.3 V at 5 A. The syncout of controller is used to sync boost at F/9 frequency.

  • Lossless bypass operation, avoids loss in boost diode
  • Wide Vin support for automotive application
  • Cycle-by-cycle current limit and optional hiccup-mode overload protection
  • Low-cost solution and high-efficiency solution for 50-W application
  • Smart diode for highly efficient reverse battery protection

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
Vin (Min) (V)41010
Vin (Max) (V)323232
Vout (Nom) (V)103.33.3
Iout (Max) (A)555
Output Power (W)5016.516.5
Input TypeDCDCDC
TopologyBoost- SynchronousBuck- SynchronousBuck- Synchronous

TI Devices (4)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CD74HC4017  High Speed CMOS Logic Decade Counter/Divider with 10 Decoded Outputs  Specialty logic ICs  Sample & Buy View Design Kits & Evaluation Modules
LM3481-Q1  2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM5140-Q1  Wide Vin Dual 2.2MHz low Iq Synchronous Buck Controller  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

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CD74HC4017 Download -
Download Download
Download Download
Download Download
LM3481-Q1 Download Download
LM5140-Q1 Download Download
LM74610-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 10150 21 Mar 2016
Design files (5)
Title Type Size (KB) Date
ZIP 1537 21 Mar 2016
ZIP 640 21 Mar 2016
PDF 28 21 Mar 2016
PDF 617 21 Mar 2016
PDF 450 21 Mar 2016

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