High Input Voltage Synchronous Buck Provides Two Independent Outputs of 28V at 2A and 16V at 4A


Design files


The LM5119 controller allows the user to have two separate regulated outputs or the capability to combine the outputs (of the same voltage) into a two-phase regulator. This design operates from a 36V - 51V input and regulates 28V@2A (with transients up to 7A) and 16V@4A (with transients up to 6A).

  • Allows for dual or single regulated outputs
  • 36V - 51V input
  • Greater than 96% efficiency
  • Sequenced output voltage
  • Board length is approximately 69 mm
  • Test report is available
Output voltage options PMP9227.1 PMP9227.2
Vin (Min) (V) 36 36
Vin (Max) (V) 51 51
Vout (Nom) (V) 16 28
Iout (Max) (A) 6 7
Output Power (W) 96 196
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Synchronous Buck- Synchronous
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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

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TIDU895.PDF (1758 K)

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

TIDRE02.PDF (150 K)

Detailed schematic diagram for design layout and components

TIDRE03.PDF (40 K)

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

TIDCA33.ZIP (227 K)

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


Includes TI products in the design and potential alternatives.

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

LM51195.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller

Data sheet: PDF | HTML

CSD19533Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.5 mOhm

Data sheet: PDF | HTML

CSD19534Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 15.1 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article Power Tips: The ground plane – a critical element in noise management of switching PDF | HTML Aug. 19, 2015
Test report PMP9227 Test Results Apr. 08, 2015

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