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


Design files


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
Output voltage options PMP20371.1
Vin (Min) (V) -60
Vin (Max) (V) -35
Vout (Nom) (V) 14.5
Iout (Max) (A) 9
Output Power (W) 130.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck Boost- Inverting
Communications equipment
?? View video with transcript Video

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCG4.PDF (1320 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRO40.PDF (418 K)

Detailed schematic diagram for design layout and components

TIDRO41.PDF (134 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRO42.PDF (174 K)

Detailed overview of design layout for component placement

TIDRO44.ZIP (583 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRO43.PDF (1435 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM51223-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

Data sheet: PDF | HTML
General-purpose op amps

TLV271Single, 16-V, 3-MHz operational amplifier

Data sheet: PDF | HTML

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Test report PMP20371 Test Results Oct. 24, 2016

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​