61W Automotive Dual Output Synchronous Buck Converter Reference Design
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Key Document


PMP10655 is a dual-output synchronous buck converter reference design using the LM5140 controller IC. The reference design accepts an input voltage between 6Vin and 18Vin and is capable of supplying a maximum of 8A of continuous current (14A Peak) to the load, per output. Vout1 and Vout2 maintain regulation during cold-crank (Vin dip to 4.3Vin) and load-dump (Vin peak to 42Vin) conditions. Switching of the two converters are 180 degrees out of phase between each other.  The design also features the LM5050-1 OR-ing controller configured for efficient reverse polarity protection of the input.  PMP10655 is built on a 4-layer FR-4 PCB, with 2 oz. Copper on the Top and Bottom layers, and 1 oz. Copper on the two internal layers.

  • 2.2MHz switching to bypass AM band
  • Front-end high-efficiency reverse polarity protection
  • Smooth switching frequency foldback when in dropout
  • High-side and low-side gate drives with indepdendent rising and falling slew-rate control

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)66
Vin (Max) (V)1818
Vout (Nom) (V)3.83.8
Iout (Max) (A)88
Output Power (W)30.430.4
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5050-1-Q1  5-V to 75-V, 400-uA IQ automotive ideal diode controller  Power switches  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

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5050-1-Q1 Download Download
LM5140-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1061 06 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 414 06 Dec 2017
ZIP 1372 06 Dec 2017
PDF 1396 06 Dec 2017
PDF 165 06 Dec 2017
PDF 103 06 Dec 2017
PDF 346 06 Dec 2017

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