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


Design files


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
Output voltage options TIDA-01512.1 TIDA-01512.2
Vin (Min) (V) 10.8 10.8
Vin (Max) (V) 13.2 13.2
Vout (Nom) (V) 1 1.2
Iout (Max) (A) 120 50
Output Power (W) 120 60
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Multiphase^Buck- Synchronous Buck- Multiphase^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

Download ready-to-use system files to speed your design process.

TIDUDD3A.PDF (10748 K)

Reference design overview and verified performance test data

TIDRV79.PDF (504 K)

Detailed schematic diagram for design layout and components

TIDRV80.PDF (217 K)

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

TIDRV81.PDF (142 K)

Detailed overview of design layout for component placement


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

TIDRV82.PDF (454 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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

TPS53681Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS737-Q1Automotive 1A ultra-low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF
Low-side drivers

UCC27524A5-A/5-A dual-channel gate driver with 5-V UVLO, enable, and negative input voltage handling

Data sheet: PDF | HTML

CSD17570Q5B30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 0.92 mOhm

Data sheet: PDF | HTML
Si power stages

CSD95490Q5MC75A Synchronous Buck NexFET™ Smart Power Stage with DualCool Package

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide PMBus Voltage Regulator Ref Design for NXP QorIQ LS2085A/LS2088A Processors (Rev. A) Aug. 23, 2018

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