Power Management IC for cSSDs Realizing Space Saving and Low Power Consumption Technical Review

PublishTime：2021-07-02

●With the reductions in unit price per storage capacity of solid-state drives (SSDs) equipped with NAND flash memory in recent years, the replacement of hard disk drives (HDDs) by SSDs as storage devices for client systems, including notebook PCs and tablets, has been progressing. However, the higher speed interfaces and larger storage capacities of such client SSDs (cSSDs) may result in a trend toward increasing power consumption in the future. It has therefore become necessary to improve the energy conservation performance of cSSDs in accordance with international standards such as the Energy Star program.
●In response to this situation, Toshiba Electronic Devices & Storage Corporation developed the TC7738WBG power management integrated circuit (IC) for cSSDs with the aim of realizing both space saving and low power consumption in December 2016. The TC7738WBG achieves a reduction in power consumption of approximately 55% during sleep mode, when power consumption is at its lowest, and a reduction in package area of up to 30% through the use of a wafer-level chip scale package (WCSP) and an onboard protection switch instead of the conventional fuse, respectively, compared with our conventional products.
●Introduction
■An SSD is a storage device that employs a NAND flash memory as the storage medium. Unlike in the case of HDDs, no motors are needed, which results in faster access, quiet operation, higher shock resistance, lower power consumption, less weight and smaller size.
●Therefore, in line with the Energy Star program and other international efforts for energy conservation, HDD storage media for clients such as notebook PCs and tablets are being replaced by cSSDs. In addition, the per-unit cost of storage for SSDs is decreasing. It is expected that the application field will continue to expand, mainly for client devices, by catering to different form factors.
●With these circumstances in mind, Toshiba Electronic Devices & Storage Corporation developed a power management IC for cSSD. This IC has a high-speed load response characteristic by the adoption of hysteretic control employing fixed-frequency modulation, which is a unique DC (direct current) - DC conversion (hereinafter abbreviated as DCDC) control method. In addition, instead of a fuse, a built-in protection switch with enhanced input protection was developed and enclosed in a small WCSP, helping reduce space. Here we describe the characteristics and functions of this newly developed product.

Brand of Product：	TOSHIBA
Part#：	TC7738WBG More Part#
Product Category：	Power Management IC More
Application：	More
Data Type：	Supplier and Product Introduction More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：	WCSP;QFN
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2020/04/05
Version Number：	Vol
Data Encoding：
Data Size：	810 KB

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