Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5140-Q1
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Key Document


PMP15032 demonstrates the operation and performance of the LM5140-Q1 synchronous buck controller in a high current dual-phase application. The PMP15032 operates over the input voltage range of 5.5 to 42V. The EVM provides a 5.0V output with a maximum load current of 45A (22.5A per phase).  The LM5140-Q1 switching frequency is set to 440 kHz to minimize switching losses and obtain maximum efficiency.

  • 5.5V to 42VIN, 5VOUT @ 45A, 22.5A per phase
  • 93.54% efficiency
  • Solution size: 2.5 inch x 3.8 inch maximum component height: 0.25 inch

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(Output Voltage 1)
Vin (Min) (V)5.5
Vin (Max) (V)42
Vout (Nom) (V)5
Iout (Max) (A)45
Output Power (W)225
Input TypeDC
TopologyBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy 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
LMP7701  Precision, CMOS Input, RRIO, Wide Supply Range Single Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5140-Q1 Download Download
LMP7701 Download Download
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User guide (1)
Title Type Size (KB) Date
PDF 1153 28 Jun 2017
Design files (6)
Title Type Size (KB) Date
ZIP 585 28 Jun 2017
ZIP 1056 28 Jun 2017
PDF 1454 28 Jun 2017
PDF 186 28 Jun 2017
PDF 30 28 Jun 2017
PDF 233 28 Jun 2017

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