25W Automotive Start-Stop Reference Design Operating at 2.2 MHz


Design files


Automotive 12V batteries typically operate in the range of 9V-16V. However this voltage can vary widely due to transient conditions such as cold crank and load dump. This reference design creates a well-regulated 25W (5V,5A) output, regardless of large input voltage transients, utilizing the LM5150-Q1 and LM5141-Q1. The LM5150-Q1 is implemented as a pre-boost, only switching when the input voltage is below 6.8V, and utilizes the inductor as a differential EMI filter when not switching. The LM5141-Q1 operates as a buck controller regulating  the 5V output. Both devices switch at 2.2 MHz.

  • 2.8V minimum input voltage
  • 25W output peak power (5V, 5A)
  • 2.2MHz switching frequency
Output voltage options PMP15041.1
Vin (Min) (V) 2.8
Vin (Max) (V) 40
Vout (Nom) (V) 5
Iout (Max) (A) 5
Output Power (W) 25
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- Non Sync^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

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TIDT001.PDF (1332 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRVU2.ZIP (1194 K)

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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

LM5150-Q1Automotive 1.5-V to 42-V VIN, low IQ boost controller with 6.8V, 7.5V, 8.5V, 10.5V output options

Data sheet: PDF | HTML
Buck controllers (external switch)

LM5141-Q1Automotive wide-input 2.2-MHz low-IQ synchronous buck controller

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report 25-W, Automotive, Start-Stop Reference Design Operating at 2.2 MHz Mar. 01, 2018

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