High Voltage Synchronous Buck, 5V/9A out of 48V Telecom Input Reference Design


Design files


This reference design delivers 5.1V with 9A output current out of 48V. It could be also used for 48V automotive bus voltage.

  • Suitable for telecom
  • Small footprint (power stage: 24mm X 44mm)
  • Added input filter to attenuate reflected ripple
  • Excellent load regulation
Output voltage options PMP10117.1
Vin (Min) (V) 46
Vin (Max) (V) 50
Vout (Nom) (V) 5.1
Iout (Max) (A) 9
Output Power (W) 45.9
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous
Communications equipment
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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.


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

TIDRH68.PDF (143 K)

Detailed schematic diagram for design layout and components

TIDRH69.PDF (100 K)

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

TIDRH71.ZIP (315 K)

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


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

TIDRH70.PDF (551 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

TPS401704.5 V to 60 V Wide-Input Synchronous PWM Buck Controller

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18531Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 4.6 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18534Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP10117 Test Results Sep. 23, 2015

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