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1. (WO2017112163) TECHNIQUES TO POWER DOWN OUTPUT POWER RAILS FOR A STORAGE DEVICE
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CLAIMS:

What is claimed is:

1. An apparatus comprising:

power loss imminent (PLI) logic for a storage device, at least a portion of the PLI logic in hardware, the PLI logic to:

detect that a source voltage received from a power source has dropped below a threshold voltage, the power source arranged to provide operational power to the storage device;

cause a first output capacitor for a first output power rail of the storage device to discharge a first energy away from the first output capacitor and through a first voltage regulator for the first output power rail to a power input for the first output power rail and one or more other output power rails including a second output power rail; and

cause the first energy and a second energy discharging from an input capacitor for the power input to be a second power source to provide source power to a second voltage regulator for the second output power rail to enable the second output power rail to provide power or to ramp down power provided to a second output load.

2. The apparatus of claim 1, comprising the PLI logic to:

monitor the voltage resulting from the first energy during discharge of the first output capacitor; and

cause the voltage of the first energy to be reduced based on whether the voltage of the first energy exceeds a voltage threshold.

3. The apparatus of claim 2, the PLI logic to reduce the voltage of the first energy comprises the PLI logic to:

activate a controlled load in parallel with the input capacitor to cause the voltage of the first energy to fall below the voltage threshold.

4. The apparatus of claim 2, the PLI logic to reduce the voltage of the first energy to the lower voltage comprises the PLI logic to:

activate a resistive discharge of the first energy before the first energy passes through the first voltage regulator to cause the voltage of the first energy to fall below the voltage threshold.

5. The apparatus of claim 2, the PLI logic to reduce the voltage of the first energy to the lower voltage comprises the PLI logic to:

activate a resistive discharge of the first energy after the first energy passes through the first voltage regulator to cause the voltage of the first energy to fall below the voltage threshold.

6. The apparatus of claim 2, comprising the voltage threshold based on a voltage rating for the first regulator, the second regulator or the input capacitor, the voltage rating based on a voltage tolerance level set to prevent damage to the first regulator, the second regulator or the input capacitor if the voltage threshold is exceeded.

7. The apparatus of claim 1, comprising the PLI logic to:

detect that the second output power rail has completed operation and can be powered down;

cause a second output capacitor for the second output power rail to discharge an energy away from the second output capacitor and through the second voltage regulator for the second output power rail to the power input; and

cause the first energy, the second energy and the fourth energy to be a third power source to provide source voltage to a third voltage regulator for a third output power rail to enable the third output power rail to ramp down power provided to a third output load.

8. The apparatus of claim 1, comprising the PLI logic to:

cause a holdup capacitor to discharge a fourth energy to the power input; and

add the fourth energy to the power input to provide the additional power to the second power source.

9. The apparatus of claim 1, the storage device comprising a solid state drive including one or more non-volatile memory devices comprising at least one of a 3-dimensional cross-point memory, a memory that uses chalcogenide phase change material, a flash memory, a ferroelectric memory, a silicon-oxide-nitride-oxide-silicon (SONOS) memory, a polymer memory, ferroelectric polymer memory, ferroelectric transistor random access memory

(FeTRAM or FeRAM), an ovonic memory, a nanowire, an electrically erasable programmable read-only memory (EEPROM), a phase change memory, memristors or a spin transfer torque -magnetoresistive random access memory (STT-MRAM).

A method comprising:

detecting, at a processing circuit, that a source voltage received from a power source arranged to provide operational power to a storage device has dropped below a threshold voltage;

causing a first output capacitor for a first output power rail of the storage device to discharge a first energy away from a first output capacitor and through a first voltage regulator for the first output power rail to a power input for the first output power rail and one or more other output power rails including a second output power rail; and

combining the first energy and a second energy discharging from an input capacitor for the power input, the combined first and second energy to serve as a second power source to provide source power to a second voltage regulator for the second output power rail to enable the second output power rail to provide power or to ramp down power provided to a second output load.

1 1. The method of claim 10, comprising:

monitoring the voltage of the first energy during discharge of the first output capacitor; and

reducing the first energy based on whether the voltage of the first energy exceeds a voltage threshold.

12. The method of claim 1 1, reducing the first voltage comprising:

activating a controlled load in parallel with the input capacitor to cause the first energy to fall below the voltage threshold.

13. The method of claim 1 1, reducing the voltage of the first energy to the lower voltage comprising:

activating a resistive discharge of the first energy before the first energy passes through the first voltage regulator to cause the voltage of the first energy to fall below the voltage threshold.

14. The method of claim 1 1, reducing the voltage of the first energy to the lower voltage comprising:

activating a resistive discharge of the first energy after the first energy passes through the first voltage regulator to cause the first energy to fall below the voltage threshold.

15. The method of claim 10, comprising:

detecting that the second output power rail has completed operation and can be powered down;

causing a second output capacitor for the second output power rail to discharge an energy away from the second output capacitor and through the second voltage regulator for the second output power rail to the power input; and

combining the first energy, the second energy and the fourth energy, the combine first, second and third energies to serve as a third power source to provide source voltage to a third voltage regulator for a third output power rail to enable the third output power rail to ramp down power provided to a third output load.

16. The method of claim 10, comprising:

causing a holdup capacitor to discharge a fourth energy to the power input; and adding the fourth energy to the power input to provide the additional power to the second power source.

17. At least one machine readable medium comprising a plurality of instructions that in response to being executed by a system cause the system to carry out a method according to any one of claims 10 to 16.

18. An apparatus comprising means for performing the methods of any one of claims 10 to 16.

19. A system comprising:

one or more memory devices; and

a power management module to manage power provided to the one or more memory devices, the power management module including a power loss imminent (PLI) logic, at least a portion of the PLI logic in hardware, the PLI logic to:

detect that a source voltage received from a power source has dropped below a threshold voltage, the power source arranged to provide operational power to the one or more memory devices;

cause a first output capacitor for a first output power rail of the one or more memory devices to discharge a first energy away from a first output load and through a first voltage regulator for the first output power rail to a power input for the first output power rail and one or more other output power rails including a second output power rail; and

cause the first energy and a second energy discharging from an input capacitor for the power input to be a second power source to provide source voltage to a second voltage regulator for the second output power rail to enable the second output power rail to provide power or to ramp down power provided to a second output load.

20. The system of claim 19, comprising the PLI logic to:

monitor the voltage of the first energy during discharge of the first output capacitor; and cause the voltage of the first energy to be reduced based on whether the first energy exceeds a voltage threshold.

21. The system of claim 20, the PLI logic to reduce the first energy comprises the PLI logic to:

activate a controlled load in parallel with the input capacitor to cause the voltage of the first energy to fall below the voltage threshold.

22. The system of claim 17, the PLI logic to reduce the voltage of the first energy to the lower voltage comprises the PLI logic to:

activate a resistive discharge of the first energy before the first energy passes through the first voltage regulator to cause the voltage of the first energy to fall below the voltage threshold.

23. The system of claim 17, the PLI logic to reduce the voltage of the first energy to the lower voltage comprises the PLI logic to:

activate a resistive discharge of the first energy after the first energy passes through the first voltage regulator to cause the voltage of the first energy to fall below the voltage threshold.

24. The system of claim 19, comprising the PLI logic to:

detect that the second output power rail has completed operation and can be powered down;

cause a second output capacitor for the second output power rail to discharge an energy away from the second output capacitor and through the second voltage regulator for the second output power rail to the power input; and

cause the first energy, the second energy and the fourth energy to be a third power source to provide source voltage to a third voltage regulator for a third output power rail to enable the third output power rail to ramp down power provided to a third output load.

The system of claim 19, comprising the PLI logic to:

cause a holdup capacitor to discharge a fourth energy to the power input; and add the fourth energy to the power input to provide the additional power to the second source.