Comparison: 0.8V/8W GaN vs Silicon Power Supply Reference Design
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Key Document


This reference design provides customers with a comparison study on the usage of GaN vs SI in power supply designs. This specific design uses TPS40400 controller to drive CSD87381 for the silicon power supply and LMG1210 with EPC2111 for the GaN power supply to provide 0.8V/10A. This design compares the silicon and GaN power stages and illustrates the design tradeoffs and necessary optimizations when designing with GaN.

  • PMBus programmable OPC, UVLO, OV, switching frequency, and soft start
  • Deadtime adjustment through pin strapping on LMG1210
  • Power board and daughter card impelemtatation
  • Optimizing deadtime showed 5% increase in GaN efficiency

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)66
Vin (Max) (V)8.48.4
Vout (Nom) (V).8.8
Iout (Max) (A)1010
Output Power (W)88
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD87381P  30-V, N channel synchronous buck NexFET™ power MOSFET, 3 mm x 2.5 mm LGA, 15 A  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
LMG1210  1.5-A, 3-A, 200-V half bridge gate driver, 5-V UVLO and programmable dead-time for GaNFET and MOSFET  Gate drivers  Sample & Buy Not Available
TPS40400  3-V to 20-V, 30-A, synchronous buck controller with PMBus™, including Telemetry  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD87381P Download
LMG1210 WQFN (RVR)| 19 Download Download
TPS40400 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1206 23 May 2018
Design files (9)
Title Type Size (KB) Date
ZIP 5705 23 May 2018
ZIP 1773 23 May 2018
ZIP 699 23 May 2018
PDF 109 23 May 2018
PDF 76 23 May 2018
PDF 107 23 May 2018
PDF 106 23 May 2018
PDF 133 22 May 2018
PDF 104 22 May 2018

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