12Vin Compact Dual 5V/5.5A Point-of-Load with PMBus using NexFET Power Block II Reference Design
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Key Document


The PMP9559 reference design is a compact dual 5.5A POL solution with PMBus in 0.65" by 0.90" size. It showcases CSD87381P power block II with high efficiency and excellent thermal performnce. It has programmable frequency, soft-start, external compensation, adjustable current limit and OCP/OVP/OTP features. It also adds PMBus capability to low current rails.  It is suitable for digital high density low-current power rails (<11A).

  • Compact dual 5.5A PoL  in 0.65" by 0.90" size (16.5mm x22.9mm)
  • High efficiency 94.4% at 5V/6A, 300kHz
  • Excellent thermal performance by utilizing double-side cooled NexFET Power Block II
  • Full-feature dual  supply  with PMBus (0.6V~5V output). Option for single 11A rail.
  • This design is optimized for size and efficiency.
  • This design is fully tested.

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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)5
Iout (Max) (A)5.5
Output Power (W)27.5
Input TypeDC
TopologyBuck- Multiphase
Buck- Synchronous

TI Devices (2)

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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
TPS40422  Dual Output or Multiphase Synchronous Buck Controller with PMBus  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
TPS40422 Download Download
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1435 04 Aug 2015
Design files (4)
Title Type Size (KB) Date
ZIP 148 04 Aug 2015
PDF 268 04 Aug 2015
PDF 107 04 Aug 2015
PDF 190 04 Aug 2015

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