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LM34938-QUICKSTART-CALC

LM34938 BuckBoost Quickstart Calculator Tool

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Latest version
Version: 2.0.0
Release date: Oct 15, 2026
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LM34938Q1_Buck-Boost_Quickstart_Tool_V2_0_0.xlsm  — 6953 K

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Products
DC/DC controllers
LM34938-Q1 — Automotive, 36V VIN, four-switch buck-boost controller with I²C and 2.2MHz FSW for wireless charging
Hardware development
Evaluation board
LM34938Q1EVM-HD — LM34938-Q1 evaluation module

Release Information

The LM34938Q1 BuckBoost Quickstart Calculator tool supports you defining the power stage using the LM34938Q1 and selecting the required external components.

What's new

  • Adjusted Vout range check according datasheet values                   
  • Added Additional Info page                   
  • Fixed calculation of Rcs sense resistor power loss                   
  • Merged in devices with same power stage architecture                   
  • Added calculation for Cable Drop Compensation                   
  • Improved calculation of slope compensation impact on loop stability                   
  • Updated R_CFG bit descriptions for LM251772, LM251772-Q1, LM34938-Q1 and LM851772-Q1         
  • Added checkers with error highlighting (UVLO, max inductor current)