PMBus Voltage Regulator Reference Design for NXP QorIQ LS2085A/88A Processors


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Key Document


TIDA-01512 uses the TPS53681 multiphase controller and CSD95490Q5MC Smart Power Stages to implement a high-performance design suitable for powering NXP QorIQ Communications Processors.

The dual outputs of the controller target the 60-ATDC, 1.0-V core rail with a four-phase design and a 30-ATDC, 1.2-V auxilliary rail. Utilizing smart power stages and integrated PMBus™ functionality allows for easy output voltage setting, telemetry of key design parameters, and compensation adjustment.

During validation a >50% reduction in output capacitance was seen over NXP 's reference board.

  • Dual Rail 4+2 Design - Targeting LS2085A/88A VDD and GVDD Rails
  • PMBus monitoring of VIN, VOUT, IOUT, PIN, and POUT
  • Dual Rail Temperature Monitoring
  • Peak Efficiencies of 92% and 94% for VDD and GVDD Rails
  • >50% reduction in COUT over NXP Eval Board

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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(Output Voltage 1)
Vin (Min) (V)10.8
Vin (Max) (V)13.2
Vout (Nom) (V).9
Iout (Max) (A)150
Output Power (W)135
Input TypeDC
TopologyBuck- Multiphase
Buck- Synchronous

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17570Q5B  30-V, N-Channel NexFET Power MOSFET, CSD17570Q5B  MOSFETs  Sample & Buy Not Available
CSD95490Q5MC  75A Synchronous Buck NexFET™ Smart Power Stage with DualCool Package  MOSFETs  Not Available Not Available
TPS53681  Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS737-Q1  Automotive Single Output LDO, 1A, Reverse Current Protection  Power management  Sample & Buy Not Available
UCC27524A  Dual, 5A, High-Speed Low-Side Power MOSFET Driver, with Negative Input Voltage Ability  Gate Drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS53681 Download
TPS737-Q1 Download Download
UCC27524A Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 10748 23 Aug 2018 26
Design files (5)
Title Abstract Type Size (KB) Date Views
ZIP 708 22 Dec 2017 21
PDF 454 22 Dec 2017 26
PDF 142 22 Dec 2017 18
PDF 217 22 Dec 2017 26
PDF 504 22 Dec 2017 68
Related Tools & Software

Software (1)

Name Part Number Software Type
Digital Power Software  FUSION_DIGITAL_POWER_DESIGNER  Application Software & Frameworks 

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