Last Gasp Hold Up Energy Storage Solution


Design files


This solution stores and delivers "last gasp" energy for systems, such as SSDs, that require functionality for a short time after power loss in order to shut down in a controlled fashion. By storing holdup energy at higher than bus voltage the amount of capacitance can be reduced by up to 80%, significantly reducing solution size and cost while improving reliability.
Typically a complex electronics circuit is needed to boost the input voltage, mux it with the buck input during power failure,  and bucking it down to 3.3V or 5V for the load.

This reference design uses TI’s TPS25942 on the input side to control inrush, protect against over voltage, under voltage, short circuits, and prevent stored energy from flowing back to a shorted input bus. The boost converter charges the capacitor bank to 12V if input supply is 5V, or 18V if input supply is 12V. When the TPS25942 detects and declares a fault the FLTb signal is used to drive a P-MOSFET that connects the storage capacitors to the buck input.

  • "Last Gasp" Holdup Energy for controlled turn off.
  • Reduces solution size and cost while increasing reliability
  • Provides multiple levels of protection to load and bus.
  • External controller not required.
  • Prevents holdup energy from flowing back onto a shorted bus.
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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.

TIDU506.PDF (902 K)

Reference design overview and verified performance test data

TIDRA76.PDF (58 K)

Detailed schematic diagram for design layout and components

TIDRA77.PDF (132 K)

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

TIDRA78.ZIP (233 K)

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


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

TPS544954.5V to 18V Input, Dual 4A/2A Output, Synchronous Step-Down Converter

Data sheet: PDF
AC/DC & DC/DC converters (integrated FET)

TPS611701.2A Switch, 38V High Voltage Boost Converter in 2x2mm QFN Package

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS259402.7-V to 18-V, 42mΩ, 0.6-5.2A eFuse with reverse current blocking and DevSleep support

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Design guide Last Gasp Hold Up Energy Storage Solution (TIDA-00304 Reference Guide) Aug. 25, 2014

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