100W System-Level Power Reference Design for Automotive Infotainment System
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Key Document


PMP10749 is a 100-W system-level SMPS design for a higher-power automotive infotainment system. 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 TVS.
  2. EMI filter: 14-A common modes choke at front end with a differential filter for conducted EMI suppression.
  3. Preboost: Highly efficient synchronous preboost design for 100-W application. The output is maintained at 10 V and when Vin > Vout , the output follows the input and true bypass operation is achieved.
  4. Dual buck controller: 2.2-MHz switching for AM band avoidance, as well as small size solution. Supports two outputs: 5 V at 10 A, as well as 3.3 V at 10 A. The syncout of controller is used to sync boost at F/10 frequency.


  • 2.2-MHz switching for SYNC buck controller – avoid AM band + smaller size
  • Wide Vin support for automotive application
  • Cycle-by-cycle current limit and optional hiccup-mode overload protection
  • Low-cost and high-efficiency solution for 100-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)101010
Output Power (W)1003333
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
LM5122-Q1  Automotive, 3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase  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
LM5122-Q1 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 6708 21 Mar 2016
Design files (5)
Title Type Size (KB) Date
ZIP 454 21 Mar 2016
ZIP 1778 21 Mar 2016
PDF 25 21 Mar 2016
PDF 611 21 Mar 2016
PDF 495 21 Mar 2016

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