125W Non-Isolated Inverting Buck Boost for Telecom -48V Applications Reference Design
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Key Document


PMP20371 is a synchronous buck boost design utilizing the LM5122 for telecom applications. This design has a minimum operating input voltage of -35V and a maximum input voltage of -60V.  Switching frequency is set to 150kHz. The design is built on PMP20371 PCB, 4 layer board with 2oz copper on each layer.

  • -35V to -60V in, output 14.5V@ 9A
  • Achieving efficiency of 93% across all operating conditions
  • Compact size, slim form factor, suitable for telecom applications
  • Solution size:  48mm x 45mm
  • LM5122 synchronous boost controller, wide input voltage, high efficiency

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(Output Voltage 1)
Vin (Min) (V)-35
Vin (Max) (V)-60
Vout (Nom) (V)14.5
Iout (Max) (A)9
Output Power (W)130.5
Input TypeDC
TopologyBuck Boost- Inverting

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5122  3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TLV271  Single 16V, 3MHz, 550-uA/ch, rail-to-rail output op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5122 Download Download
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TLV271 Download Download
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User guides (1)
Title Type Size (KB) Date
PDF 1313 24 Oct 2016
Design files (6)
Title Type Size (KB) Date
ZIP 405 24 Oct 2016
ZIP 583 24 Oct 2016
PDF 1435 24 Oct 2016
PDF 174 24 Oct 2016
PDF 134 24 Oct 2016
PDF 418 24 Oct 2016

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