12Vin Compact Dual 10A Point-of-Load Reference Design with PMBus Using NexFET Power Block
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Key Document


The PMP8553 reference design is a compact dual 10A POL solution with PMBus in 0.75" by 0.975" size (19mm x24.8mm). It showcases NexFET power block CSD87330 in high density PoL. It also adds PMBus capability to low current rails.  It is easy to configure as dual 10A or single 20A output with resistor options. It is versatile for digital high density low-current power rails (<20A).

  • 8V to 14V in, 3.3V/8A and 1V/10A out
  • Peak efficiency 89% at 1Vout, 300kHz
  • Total solution size: 0.75" x 0.975" (19mm x 24.8mm)
  • Option for single 20A
  • PMBus enabled margining and sequencing

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)88
Vin (Max) (V)1414
Vout (Nom) (V)3.31
Iout (Max) (A)810
Output Power (W)26.410
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD87330Q3D  30-V, N channel synchronous buck NexFET™ power MOSFET, SON 3 mm x 3 mm power block, 20 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)
CSD87330Q3D LSON-CLIP (DQZ)| 8 Download -
TPS40422 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 809 11 Dec 2017
Design files (5)
Title Type Size (KB) Date
ZIP 163 11 Dec 2017
PDF 237 11 Dec 2017
PDF 36 11 Dec 2017
PDF 49 11 Dec 2017
PDF 118 11 Dec 2017

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