Systems, methods and devices for regulation or isolation of backup power in memory devices

1. A data-storage device comprising:

a memory control circuit;

a solid-state non volatile memory circuit for providing, under control of the memory control circuit, storage of data;

a volatile memory circuit having a primary-operating power and for storing, under control of the memory control circuit, write data destined for the solid-state nonvolatile memory circuit;

power circuitry for receiving electrical power from an external host-system power source and for providing the received electrical power for use as the primary-operating power; and

a backup power circuit including

an energy-storage circuit with one or more energy storage components designed to hold sufficient energy to provide substantially all of the primary-operating power during a minimum time period sufficient to permit data transfer, of at least dirty write data, from the volatile memory circuit to the nonvolatile memory circuit, and

an isolation-regulation circuit for providing voltage regulation of the electrical power received from the host-system power source, for providing the regulated voltage for charging of the energy storage circuit, and for isolating the host-system power source from the energy storage components in response to the power received from host-system power source dropping below a voltage threshold level.

2. The data storage device of claim 1 wherein the one or more energy storage components include one or more supercapacitors.

3. The data storage device of claim 2 , further including a configuration circuit for determining a charging voltage level for charging the supercapacitor and wherein the isolation-regulation circuit is configured to provide the voltage regulation as a function of the determined charging voltage level.

4. The data storage device of claim 1 , wherein the isolation-regulation circuit includes a buck-boost regulator that is configured to deliver a regulated voltage that is higher than a voltage of the power received from host-system power source.

5. The data storage device of claim 1 , wherein the isolation-regulation circuit includes a buck regulator that can be configured to deliver a regulated voltage that is lower than a voltage of the power received from host-system power source.

6. The data storage device of claim 1 , further including a power control circuit for generating a control signal as a function of detected power-providing capabilities of the energy storage circuit and wherein the isolation-regulation circuit includes a buck-boost regulator that controls a voltage level applied to the energy storage components in response to the control signal.

7. The data storage device of claim 1 , wherein the isolation-regulation circuit is configured and arranged to control a charging voltage of the energy storage components substantially independent of a voltage of the power received from the host-system.

8. The data storage device of claim 1 , wherein the isolation-regulation circuit includes a voltage regulator configured and arranged and to generate, from the received host-system power, a voltage, for charging a capacitor, that is substantially independent of a voltage of the primary-operating power.

9. The data storage device of claim 1 , further including a housing structure for containing the circuits within a hard-disc form factor corresponding to one of: 5.75 inch×1.63 inch×8 inch; 4 inch×1 inch×5.75 inch; 0.59 inch×2.8 inch×3.9 inch, and 0.28 inch×2.8 inch×3.9 inch.

10. A data storage device comprising:

a hard-disc housing structure containing,

a power supply input for providing operating power;

a memory control circuit;

a nonvolatile, solid-state memory circuit for providing memory access, under control of the memory control circuit, to data;

a caching memory circuit having a primary-operating power input and for storing a cached version of the data, the caching memory circuit subject to loss of the cached version of the data in response to a voltage at a primary-operating power input dropping below a voltage threshold level;

an operating power circuit for carrying power the power supply input to the primary-operating power input of the caching memory circuit; and

a backup power circuit including

a power-reservoir circuit, including a capacitor, designed to hold a peak charge sufficient to provide substantially all power the primary-operating power input during a minimum time period sufficient to permit transfer of at least dirty data from the caching memory circuit to the nonvolatile memory circuit, and

a buck-boost regulator circuit for providing voltage regulation of power from the power supply input, for blocking power from flowing to the power supply input from the capacitor when the primary-operating power drops below the voltage threshold level and for dedicating use of the regulated power to the power-reservoir circuit.

11. The data storage device of claim 10 , wherein the data storage device is designed to receive, on the power supply input, voltages within an operational voltage range that has a minimum voltage level and wherein the buck-boost regulator circuit is configured to regulate the power to a voltage higher than the minimum voltage level.

12. The data storage device of claim 10 , wherein the data storage device is designed to receive, on the power supply input, voltages within an operational voltage range that has a maximum voltage level and wherein the buck-boost regulator circuit is configured to regulate the power to a voltage lower than the maximum voltage level.

13. The data storage device of claim 10 , further including a test circuit for determining power providing capabilities of the capacitor and for generating a control signal in response to the determination and wherein the buck-boost regulator circuit is configured to adjust a voltage level of the regulated power in response to the control signal.

14. The data storage device of claim 10 , wherein the hard-disc housing structure includes an interface for one of a Serial Advanced Technology Attachment (SATA), Advanced Technology Attachment (ATA), Fibre-Channel-Arbitrated-Loop (FCAL), IEEE-1394, Universal Serial Bus (USB), Serial Attached SCSI (SAS), and Parallel Small Computer System Interface (SCSI).

15. A method of using a data storage device, the method comprising:

providing access to data stored within a nonvolatile solid-state memory circuit under control of a memory control circuit;

caching data within a volatile memory circuit to facilitate the operation of the data storage device including access to the solid-state memory circuit;

delivering power received from a host-system power supply to the volatile memory circuit for use as primary-operating power;

storing, in one or more energy-storage components within an energy-storage circuit, an amount of energy sufficient to provide substantially all of the primary-operating power to the volatile memory circuit during a minimum time period sufficient to permit transfer of at least dirty data from the volatile memory circuit to the nonvolatile memory circuit;

regulating, using an isolation-regulation circuit, the power received from the host-system power supply;

isolating, using an isolation-regulation circuit, the power received from the host-system power source relative to the energy-storage circuitry in response to the host-system provided power dropping below a voltage threshold level; and

charging the energy-storage component using the regulated and isolated power from the isolation-regulation circuit.

16. The method of claim 15 , wherein the step of regulating includes maintaining the regulated power within a voltage range.

17. The method of claim 15 , wherein the step of regulating includes boosting a voltage level of the power from the host-system power supply.

18. The method of claim 15 , further including the steps of testing the power providing capabilities of the energy-storage component, determining a value for the power providing capabilities as a function of the test and setting a voltage level for the regulated power to the energy-storage component as a function of the determined value.