Last Gasp Hold Up Energy Storage Solution
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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.

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS25940  2.7-V to 18-V, 42mΩ, 0.6-5.2A eFuse with reverse current blocking and DevSleep support  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS54495  4.5V to 18V Input, Dual 4A/2A Output, Synchronous Step-Down Converter  Step-down (buck) regulators  Sample & Buy Not Available
TPS61170  1.2A Switch, 38V High Voltage Boost Converter in 2x2mm QFN Package  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS25940 Download Download
TPS54495 Download
TPS61170 Download Download

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Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 902 25 Aug 2014
Design files (3)
Title Type Size (KB) Date
ZIP 233 25 Aug 2014
PDF 132 25 Aug 2014
PDF 58 25 Aug 2014

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