137W Holdup Converter for Storage Server Reference Design


Design files


PMP20818 is a holdup reference design that uses the LM3481 non-synchronous boost and LM5141-Q1 synchronous buck controllers. When the 12V input supply is available, the buck converter is disabled, and the boost converter charges a capacitive holdup bank. In the event of a power outage, the boost converter is disabled, and the buck converter is enabled to holdup the 12V input rail for 15ms with a load of 12.5A.

  • Boost followed by synchronous buck
  • Peak current-mode control
  • Buck turns on automatically at input power loss
  • No user control required
  • Low dropout buck maximizes holdup time
Output voltage options PMP20818.1 PMP20818.2
Vin (Min) (V) 13 12
Vin (Max) (V) 50 50
Vout (Nom) (V) 11 50
Iout (Max) (A) 12.5 .05
Output Power (W) 137.5 2.5
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Synchronous Boost- Non Sync
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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.

TIDUE02.PDF (1447 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


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components

TIDCE79.ZIP (350 K)

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.

Boost controllers (external switch)

LM34812.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback

Data sheet: PDF | HTML
Buck controllers (external switch)

LM5141-Q1Automotive wide-input 2.2-MHz low-IQ synchronous buck controller

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18534Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD19538Q2100-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 59 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP20818 Test Results Dec. 11, 2017

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