Reference Design for V-bus Protection based Solid State Drives




Moore’s Law – The number of transistors and resistors on a chip doubles every 24 months.



A solid-state drive (SSD) is a solid-state storage device that uses integrated circuit assemblies as memory to store data persistently. Most of the SSD
manufacturers use non-volatile NAND flash memory because of the lower cost, higher capacity integration, and data persistence without a power supply.

The reference design is based on the design TIDA-050028 which is released by Texas Instruments and focuses on the design of a Vbus based E-Fuse protection circuit for Solid-state Device modules.

There are some parameters in consideration whenever we are designing a Solid State Module such as –

  • Input power protection on VBus from overvoltage, overload, and inrush-currents.As the SSD is basically a memory storage device which works in the fusion of gates of NAND and NMOS to store binary data. As the current needed to fuse the gates is very low, more inrush current can make the data storage a non-volatile memory.
  • Compact and efficient power solutions to achieve large storage capacity per area. As memory storage is a combination of transistors and gates, the circuit involves millions of gates in a small area. The compactness of the design is important to increase the storage capacity of the drives.
  • Controllability and inrush current limit on the power rails is an important factor to be in consideration while designing a Solid State Drives. As a memory storage device is based on different active components requiring different operating voltage, power rails should be protected with inrush current and voltage protection for safer storage of data .
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Solid-State Drives are designed and is equipped with modules to provide power management. These modules ensure the working of the memory device.

The reference design provides features for designing a protection module for Solid State drives such as –

  • It provides Fast overvoltage protection clamp which has a fast response time of 5 micro-seconds.
  • It provides protection against inrush currents and current overload protection to the device and provides a robust VBus.
  • It provides Slew rate control on all switched power rails to limit inrush current to the memory gates.
  • It provides quick output discharge (QOD) safely discharges all rails, even when input power is lost.
  • It focuses on providing a size-optimized power solution for the Solid State Drives.

These are some of the features which are essential for the design and development of a feasible protection module for SSD memory devices. The design contains implementation and full design files.  All the documents can be downloaded here. 




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