Unregulated LLC module reference design for two-stage 54-V POL in data centers
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This reference design is for two-stage power architecture for 54V to VCore voltage regulator module (VRM) powering CPUs, GPUs and DDR memory in 48-V rack power architecture in data centers. The First-stage is an unregulated LLC resonant converter with an integrated planar magnetic structure and fixed transformation ratio of 6:1. The LLC module uses the UCD3138a controller and CSD95490Q5MC smart power stage for secondary side synchronous rectifiers, and LMG1205 with EPC2045 GaN devices for the primary side. The LLC module delivers a continuous output power of 600W and 98.2% maximum efficiency while operating at a maximum frequency of 1 MHz. This is module provides a power density of 1700 W/in3. The Second-stage uses the VR13.HC TPS53k DCAP+ multiphase controllers and CSD9k NexFET smart power stages capable of delivering a continuous output current of 400A with maximum efficiency of 95.6%. The Two-Stages VRM can achieve a maximum efficiency over 94% at the TDP point with minimum overshoot and undershoot with fast load transients.

  • Wide input voltage range from 40 V to 60 V
  • Unregulated output voltage range from 6.6-V to 10-V
  • 75-A continous operating current capability
  • Over 98% system efficiency at 10-V, 25-A output
  • High power density of 1700 W/in3 in a 36 mm x 26 mm footprint

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(Output Voltage 1)
Vin (Min) (V)40
Vin (Max) (V)60
Vout (Nom) (V)8
Iout (Max) (A)75
Output Power (W)600
Input TypeDC
TopologyFull Bridge- LLC

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD95490Q5MC  75A Synchronous Buck NexFET™ Smart Power Stage with DualCool Package  MOSFETs  Not Available Not Available
LMG1205  1.2-A, 5-A 100-V, half bridge gate driver with 5-V UVLO for GaNFET and MOSFET  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules
UCD3138A  UCD3138A Highly Integrated Digital Controller for Isolated Power  Digital power ICs  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD95490Q5MC VSON-CLIP (DMC)| 12 Download -
LMG1205 Download -
UCD3138A Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 3577 06 May 2020
Design files (6)
Title Type Size (KB) Date
ZIP 310 06 May 2020
ZIP 5842 06 May 2020
PDF 361 06 May 2020
PDF 71 06 May 2020
PDF 489 06 May 2020
PDF 193 06 May 2020
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
USB Interface Adapter EVM  USB-TO-GPIO  Interface adapters 

Software development (1)

Name Part Number Software Type
Digital Power Software  FUSION_DIGITAL_POWER_DESIGNER  Application software & frameworks 

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