Synchronous buck controller evaluation module


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The LM5146-Q1-EVM12V high density evaluation module (EVM) is designed to showcase the performance of the LM5146-Q1 high performance, synchronous buck DC-DC buck controller with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a wide input voltage range of 15 V to 85 V to deliver a fixed 12-V output with better than 1% setpoint accuracy and currents up to 8A. By virtue of the LM5146-Q1's minimum on-time of 40ns, operation at very low duty cycle is feasible. The LM5146-Q1 offers a full suite of protection features to ensure protection of the regulator during fault conditions. These include undervoltage lockout to ensure proper operation duing voltage-sag conditions, programmable soft-start to reduce inrsuh current, hiccup-mode overcurrent protection and thermal shutdown. Precision enable, open-drain PGOOD indicator and SYNC IN /  SYNC OUT features are also provided.

  • 15-V to 85-V input voltage range
  • 12-V output voltage with 1% setpoint accuracy
  • Rated for up to 8 A of load current
  • 400-kHz switching frequency
  • Resistor divider to EN/UVLO to faciltate programmable input voltage UVLO
  • Fully assembled, tested and proven PCB layout with small footprint
Buck controllers (external switch)
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Evaluation board

LM5146-Q1-EVM12V — Synchronous buck controller evaluation module

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Design files

Technical documentation

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Type Title Date
* EVM User's guide LM5146-Q1EVM User's Guide 10 Aug 2018
Data sheet LM5146-Q1 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. B) PDF | HTML 02 Jun 2021
Certificate LM5146-Q1-EVM12V EU Declaration of Conformity (DoC) 02 Jan 2019

Related design resources

Hardware development

LM5145EVM-HD-20A LM5145 Wide VIN Synchronous Buck Controller High Density Evaluation Module

Design tools & simulation

LM5146DESIGN-CALC LM5146-Q1 synchronous buck controller quickstart design tool

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