10-A automotive pre-regulator reference design with extended input voltage range for trucks


Design files


This reference design is a 50-W synchronous buck converter to supply automotive loads. The IC is LM5146-Q1 in fixed frequency operation at 250 kHz to ensure low noise operation. This IC (LM5146-Q1) is designed for automotive with the ability to handle load dump for truck applications.  A resistor-capacitor (RC) snubber attenuates noise in the RF band to reduce radiated emissions. To reduce system EMI, the design is prepared to either synchronize other converters (output) or be externally synchronized (input). 

  • Power stage withstands surge voltages up to 75 Vpk
  • Efficiency higher than 93% over a output current range of 3 A to 10 A  (at 14 V input voltage)
  • Tight load regulation results in a low deviation (3 mV) of the output voltage over the whole range of the input voltage
  • Input filter for minimizing conducted emissions is included
Output voltage options PMP30600-TL.1
Vin (Min) (V) 10
Vin (Max) (V) 36
Vout (Nom) (V) 5
Iout (Max) (A) 10
Output Power (W) 50
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology 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.

TIDT135.PDF (2621 K)

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

TIDM181.PDF (113 K)

Detailed schematic diagram for design layout and components

TIDM182.PDF (136 K)

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

TIDM183.PDF (105 K)

Detailed overview of design layout for component placement

TIDM184.ZIP (559 K)

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


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

TIDM125.PDF (862 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM5146-Q1Automotive 100-V synchronous buck DC/DC controller with wide duty-cycle range

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report 10-A Automotive Pre-Regulator Reference Design With Extended Input Voltage Range Sep. 20, 2019

Related design resources

Reference designs

PMP30600-AH 20-A automotive pre-regulator reference design PMP30600-AL 10-A automotive pre-regulator reference design PMP30600-TH 20-A automotive pre-regulator reference design with extended input voltage range for trucks

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