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


Design files


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.
Output voltage options PMP9559.1
Vin (Min) (V) 7
Vin (Max) (V) 13.2
Vout (Nom) (V) 5
Iout (Max) (A) 5.5
Output Power (W) 27.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology 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.

TIDUAD7.PDF (1491 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck controllers (external switch)

TPS40422Dual Output or Multiphase Synchronous Buck Controller with PMBus

Data sheet: PDF | HTML
Power blocks

CSD87381P30-V, N channel synchronous buck NexFET™ power MOSFET, 3 mm x 2.5 mm LGA, 15 A

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP9559 Test Results Aug. 04, 2015
Technical article Power Tips: Voltage mode or current mode? Oct. 02, 2015
Technical article Power Tips: Voltage mode or current mode? PDF | HTML Oct. 02, 2015

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