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Solid state drive architecture
Figure 1 shows an example diagram of an SSD system installed in a server. A 12V bus powers the switched mode power supply (SMPS), which supplies 3.3V to the SSD. NAND flash memory is used as memory because of its low cost and the ability to store data when powered off. An ASIC or other processor communicates with the host and manages the data stream. 2.5V and 1.8V are general requirements for ASICs. 
Figure 1 : Solid State Drive Power System
First, the SMPS must be a synchronous buck converter instead of a linear regulator or an asynchronous buck converter to provide high efficiency at high load currents. Second, it must also have a power-saving mode in order to keep efficiency above the minimum (even if the SSD is idle). Third, it must operate over a medium voltage, 12V input bus and provide output voltages as low as 1.8V or less, depending on the needs of the ASIC. Finally, SMPS should optimize its size, efficiency, and response time to meet the needs of SSD systems.
Dimensions <br> As SSDs begin to gain market acceptance, they are required to be backward compatible with mechanical hard drives in terms of size and functionality. When a user's mechanical hard drive fails (sometimes it can't be used for a year), SSD becomes an alternative to high reliability. Users only need to order a SSD of the same size as the failed mechanical hard drive, and the reliability of the personal computer or server can be immediately upgraded.
As SSD prices continue to fall, they are no longer just a replacement for mechanical hard drives that have expired. SSDs are now entering the high-reliability market, such as consumer applications such as enterprise servers and notebooks. For this application, miniaturization is important, and the size of the SSD no longer has to be exactly the same as a mechanical hard drive.
In either case, the size of the solution is small enough to be a big selling point for SSDs. Although not the largest subsystem in the SSD, the power supply still takes up a lot of board space because the SSD circuit is powered by several separate SMPSs. The traditional long inductors required to achieve the Z-direcTIon-making size limit (a three-dimensional problem).
Efficiency <br> An important overhead cost of a server is its power consumption. It includes the power consumed by the drive (hard disk) and the power consumed to maintain the proper temperature of the server room for heat dissipation. With the rising price of electricity and the emphasis on “green†operation, there is an increasing demand for the energy efficiency of SSD.
On the notebook side, more efficient SSDs can lead to longer battery life and lower body temperatures. Both of these aspects are ideal selling points, and the end users are easy to understand and willing to pay for them. Especially for notebook computers, the power consumption and efficiency of the SSD when it is idle is critical because these parameters can greatly affect the battery life. Compared to mechanical hard disk systems, SSDs have longer battery life, laptops have less heat, and hard drives have lower failure rates.
Response Time <br> Even when the power consumption of the device is low and the efficiency is high, what happens when the server or laptop wakes up and reads and writes to the SSD? Since the power supply voltage drops, the power supply can quickly transition from idle to full power operation to avoid SSD resets.
This is a very tricky design challenge for SMPS designers. On the one hand, the SMPS should be close to the power-off state, and the number of circuits working should be as small as possible to minimize power consumption in the idle mode of the device. On the other hand, the SMPS circuit should be biased and ready to respond quickly to the user's SSD read and write operations. This contradictory requirement requires careful balancing and compromise research. ICs designed to meet SSD requirements provide the best solution.
Solid State Drive Power Architecture Optimization
When it comes to hard disk power, solid-state drive (SSD) designers face many conflicting requirements. The first is the size of the power supply, which does not increase the SCD's volume factor, as the SSD typically must be compatible in volume with the mechanical hard disk (HDD) it replaces. This is followed by ever-increasing system efficiency requirements, including standby mode (SSD no read and write operations) and maximum power mode (read and write operations with maximum performance). These efficiencies usually have specific SSD certifications, such as Energy Star, which are critical to market acceptance. The last question is how the power supply responds to the changing needs of end users. When going from idle to high-performance, can the power supply respond quickly enough to provide powerful power to the SSD? Or, if the host suddenly makes a high-speed or large data read/write operation on the SSD, will the SSD "hang"? This article will analyze three SSD power solutions, measure and compare their size, efficiency and response time to get the best SSD power solution.