18V eFuse offers protection & extends battery life

8th August 2014

Staff Reporter

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Extending battery life in portable and adapter-powered devices, the TPS2594x family of bidirectional protection switches has been introduced by Texas Instruments. The company claims that the devices are the industry’s smallest bidirectional 18V, 5A protection switches with high power efficiency. The devices not only extend battery life in portable applications, but reduce solution size and extend battery life in enterprise and client SSDs.

Meeting the growing SSD demands for increased speed and reliability in smaller form factors, the TPS25940 and TPS25942 ICs include back-to-back FETs which provide bidirectional current control. This, TI claims, reduces system size by 50% percent compared to discrete solutions. These smart eFuse ICs save board space by maintaining over/under voltage threshold accuracy of 2%, eliminating the need for a separate supply voltage supervisor chip.

DevSleep mode is featured in the TPS25940 eFuse power switch, enabling hosts and devices to completely hibernate an SSD STA interface to reduce power consumption to less than 5mW. The TPS25942 eFuse power MUX integrates an enable block function which allows the system to select between non-ideal diode mode and ideal diode mode.

Along with the release of the eFuse devices, TI have also introduced a PMU with six integrated buck regulators. The PMU has been designed for the SandForce SF3700 SSD controllers for notebooks and PCs. The LM10692 provides phase-shifted operation at 2-MHz switching frequency to reduce the input-current ripple. In addition, the integrated PMU minimises inductor and capacitor size to save valuable board space. Using TI’s LM10692 and MSP430 with SandForce’s SF3700 controller reduces system size to a tiny 13.5mm x 9.3mm footprint.