High Efficiency, Power Density 4-Phase 1V/120A PMBus Interface Reference Design for ASIC Processors
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Key Document


The PMP11312 reference design is a 4-phase PMBus converter for high current ASIC core rail regulation. It utilizes TPS53647 4-phase controller for 120A high current rail, which employs  DCAP+ control for fast transient response and TI's proprietary AutoBalance for tight steady and dynamic phase-to-phase current balance.  TPS53647 drives TI NexFET smart power stages for high power density and efficiency. Optimized layout and improved board stack-up (8-layer, 2oz-copper) achieve higher efficiency and higher power density. PMBus capability and on-board NVM enable easy design, configuration, and customization, with telemetry of output voltage, current, temperature, and power.

  • Compact modular layout in 0.95"x2.3" (24.1mmx58.4mm)
  • High efficiency 91.7% at 1V/120A, 300kHz, 12Vin
  • Excellent thermal performance (53C FET temperature at full load with 200LFM air flow)
  • Combined ripple and transient response around +/-1.7%
  • Full PMBus telemetry of output voltage, current, power and temperature

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)7
Vin (Max) (V)13.2
Vout (Nom) (V)1
Iout (Max) (A)120
Output Power (W)120
Input TypeDC
TopologyBuck- Multiphase
Buck- Synchronous
Designed forASIC

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD95372BQ5M  60A Synchronous Buck NexFET™ Smart Power Stage  MOSFETs  Sample & Buy Not Available
TPS53647  4-Phase, D-CAP+TM Step-Down Buck Controller with NVM and PMBus Interface for ASIC  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD95372BQ5M LSON-CLIP (DQP)| 12 Download Download
TPS53647 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1373 07 Oct 2015
Design files (4)
Title Type Size (KB) Date
ZIP 240 07 Oct 2015
PDF 893 07 Oct 2015
PDF 116 07 Oct 2015
PDF 235 07 Oct 2015

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