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PMP20818

137W Holdup Converter for Storage Server Reference Design

Design files

PMP20818

Design files

Overview

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.

Features
  • 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.

download Test report — PMP20818
TIDUE02.PDF (1447 KB)

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

download Assembly drawing — PMP20818
TIDRUF7.PDF (146 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — PMP20818
TIDRUF6.PDF (103 KB)

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

download CAD/CAE symbol — PMP20818
TIDRUF9.ZIP (895 KB)

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

download Gerber file — PMP20818
TIDCE79.ZIP (350 KB)

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

download PCB layout — PMP20818
TIDRUF8.PDF (956 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — PMP20818
TIDRUF5.PDF (253 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

MOSFETs

CSD18534Q5A — 60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm

Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)

LM5141-Q1 — Automotive wide-input 2.2-MHz low-IQ synchronous buck controller

Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)

LM3481 — 2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback

Data sheet: PDF | HTML
MOSFETs

CSD19538Q2 — 100-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 59 mOhm

Data sheet: PDF | HTML

Start development

Software

Calculation tool

LM5141DESIGN-CALC — LM5141-Q1 controller quickstart design tool

Welcome to the LM5141-Q1 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM5141-Q1 65-V synchronous buck DC/DC controller with low IQ. As such, the user can expeditiously arrive at an optimized design (...)
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5141 — Low Iq, Wide Input Range Synchronous Buck Controller LM5141-Q1 — Automotive wide-input 2.2-MHz low-IQ synchronous buck controller
Hardware development
Reference design
PMP15019 — Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5141-Q1 PMP15041 — 25W Automotive Start-Stop Reference Design Operating at 2.2 MHz PMP20682 — Synchronous Buck Converter for Automotive Cluster Reference Design PMP20818 — 137W Holdup Converter for Storage Server Reference Design PMP21795 — Automotive EMI and thermally optimized synchronous buck converter reference design PMP30339 — Automotive Synchronous Buck With 3.3V @ 12.0A Reference Design TIDA-01413 — ADAS 8-Channel Sensor Fusion Hub Reference Design with Two 4-Gbps Quad Deserializers
Evaluation board
LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module
Download options

LM5141DESIGN-CALC — LM5141-Q1 controller quickstart design tool

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Version: A6
Release date: Mar 6, 2025
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LM5141-Q1_quickstart_calculator_revA6.xlsm  — 1725 K

LM5141/-Q1 controller quickstart design tool

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Products
AC/DC & DC/DC controllers (external FET)
LM5141 — Low Iq, Wide Input Range Synchronous Buck Controller LM5141-Q1 — Automotive wide-input 2.2-MHz low-IQ synchronous buck controller
Hardware development
Reference design
PMP15019 — Automotive High Current, Wide VIN Synchronous Buck Controller Reference Design Featuring LM5141-Q1 PMP15041 — 25W Automotive Start-Stop Reference Design Operating at 2.2 MHz PMP20682 — Synchronous Buck Converter for Automotive Cluster Reference Design PMP20818 — 137W Holdup Converter for Storage Server Reference Design PMP21795 — Automotive EMI and thermally optimized synchronous buck converter reference design PMP30339 — Automotive Synchronous Buck With 3.3V @ 12.0A Reference Design TIDA-01413 — ADAS 8-Channel Sensor Fusion Hub Reference Design with Two 4-Gbps Quad Deserializers
Evaluation board
LM5141QRGEVM — LM5141QRG Synchronous Buck Converter Evaluation Module

Release Information

Welcome to the quickstart design tool for the LM5141 and LM5141-Q1 synchronous buck controller family. This standalone tool facilitates and assists the power-supply engineer with the design of a DC/DC buck regulator with discrete MOSFETs. As such, the user can expeditiously arrive at an optimized design to meet the application requirements.

Technical documentation

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* Test report PMP20818 Test Results Dec 11, 2017

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Disclaimer
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