20-W, 2-switch buck boost reference design with variable output voltage
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Key Document


This reference design uses the LM25118-Q1. The input voltage is between 9 V and 16 V (withstanding pulse to 32 V). The output voltage is variable from 2 V to 18 V by means of a DAC control input. If the DAC control input is left open, the output voltage is about 13.26 V. With shorted DAC control input, the output voltage is around 18 V.

  • Output voltage can vary between 2 V and 18 V to support wireless charging
  • 2-SW buck-boost topology saves two MOSFETs and drivers versus 4-SW buck boost.
  • Minimal efficiency difference versus 4-SW buck-boost because of <3-A load current
  • Suitable for automotive applications and can survive load dump to 32 V

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(Output Voltage 1)
Vin (Min) (V)9
Vin (Max) (V)16
Vout (Nom) (V)13.3
Iout (Max) (A)3
Output Power (W)39.9
Input TypeDC
TopologyBuck Boost- 2 Switch
Buck Boost- Non Sync

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM25118-Q1  Automotive Grade, 3-42V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller  Buck-boost & inverting regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM25118-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3839 05 Nov 2018
Design files (6)
Title Type Size (KB) Date
ZIP 26 05 Nov 2018
ZIP 490 05 Nov 2018
PDF 475 05 Nov 2018
PDF 94 05 Nov 2018
PDF 136 05 Nov 2018
PDF 106 05 Nov 2018

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