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Power switch ups USB port over-current protection

Posted: 01 Feb 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Diodes? power switch? AP2552? AP2553? LCD TV?

Diodes Inc. has released a couple of programmable current-limiting power switches that offer over-current protection for two USB3.0 ports or up to four USB2.0 ports. According to the company, the AP2552 and AP2553 can protect loads of up to a maximum of 2.1A. The devices are geared for notebook, set-top box, LCD TV and other products requiring reliable over-current protection on 3.3V and 5V power rails, added the company.

The single-channel power switches claim to ensure accurate current setting and simple system configuration. In addition, to better address circuit fault protection requirements, four power switch variants have been introduced by Diodes: the AP2552 (low enable) and AP2553 (high enable), which limit output current to a constant safe level when output exceeds current limit threshold; and the AP2552A (low enable) and AP2553A (high enable), which provide latch-off during over-current, reverse-voltage or reverse-current conditions. All devices are available in the miniature SOT26 and U-DFN2020C-6 packages.

The devices boast high current accuracy, typically 6 per cent at 1.5A, and permits closer matching of the current limit to precise system requirements, cutting the need to build in unnecessary overhead, noted Diodes. Their highly scalable current limit, from 75mA to 2.35A, means the power switches can be used across a wide range of design platforms, with just a single external resistor change required.

For improved system robustness, the power switches exhibit a fast transient response time of just 2?s to prevent unnecessary system shutdown or restart. They provide a complete protection solution for USB ports, through reverse-current blocking, under-voltage lockout, over-current, over-temperature and short-circuit features. In addition, rise and fall times are controlled to minimise current surges during turn-on and turn-off, the company indicated.





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