LM5145 synchronous buck controller design tool




Welcome to the LM5145 Quickstart Design Tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM5145 75V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the application requirements.

  • Determine output filter inductance and input and output filter capacitances
  • Select components for soft-start, input UVLO, OCP and output voltage setpoint
  • Optimize compensation values and pole/zero placement in terms of control loop stability using crossover frequency as a performance metric
  • Inspect regulator efficiency and component power dissipations
  • Analyze efficiency based on selected power MOSFET parameters
  • Review auto-generated schematic, BOM list and solution size estimate


Calculation tool

LM5145DESIGN-CALC LM5145 synchronous buck controller design tool

Supported products & hardware

Supported products & hardware

Buck controllers (external switch)
LM5145 75V Synchronous Buck Controller With Wide Input Voltage and Duty Cycle Ranges LM5145-Q1 Automotive 75-V synchronous buck DC/DC controller with wide duty-cycle range
Evaluation board
LM5145EVM-HD-20A LM5145 Wide VIN Synchronous Buck Controller High Density Evaluation Module

Technical documentation

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Type Title Date
Technical article Synchronous buck controller solutions support wide VIN performance and flexibility 29 Jun 2017

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