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

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)3636
Vin (Max) (V)5151
Vout (Nom) (V)1628
Iout (Max) (A)67
Output Power (W)96196
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous

TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19533Q5A  100V, N ch NexFET MOSFETâ„¢, single SON5x6, 9.5mOhm  MOSFETs  Sample & Buy Not Available
CSD19534Q5A  100V, N ch NexFET MOSFETâ„¢, single SON5x6, 15.1mOhm  MOSFETs  Sample & Buy Not Available
LM5119  5.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD19533Q5A VSONP (DQJ)| 8 Download
CSD19534Q5A VSONP (DQJ)| 8 Download
LM5119 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1705 08 Apr 2015
Design files (3)
Title Type Size (KB) Date
ZIP 227 08 Apr 2015
PDF 40 08 Apr 2015
PDF 150 08 Apr 2015

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