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Switches ensure safety from short-circuits

Posted: 07 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:power switch? short circuit protection? USB?

Texas Instruments Inc. has released four new power-distribution switches that enable end equipment to handle heavy capacitive loads while preventing short-circuits in a variety of applications, such as USB ports/hubs, cellphones, laptops, flat panel TVs and STBs.

The new chips offer a programmable current-limit threshold from 75mA to 1.3A via an external resister with up to 6 percent accuracy. The constant current TPS2552/53 and latch-off TPS2552-1/53-1 provide at least a 50 percent improvement in current limit accuracy compared to competing solutions. The TPS2552/3 devices limit the output current to a safe level by switching into a constant-current mode when the output load exceeds the current-limit threshold while the TPS2552-1/3-1 turns the switch off completely during over-current events. The enhanced accuracy of the TPS2552/53 also enables the device to be used as a simple circuit-breaking or current-limiting solution for a wide range of applications outside of consumer end equipment, including optical modules and low current management rails in telecommunications systems.

In addition, the devices feature a wide, 2.5V to 6.5V input range and fast 2?s over-current response. Operating temperature range is at -40C to 85C.

Addition benefits of the switches include ease in USB power implementation. The devices also eliminate the need to over-design power supply for inaccurate switch. In addition, the switches' fault behavior can be optimized for different designs. The devices also allow protection for 2.5-, 3.3- and 5V rails, and features switch response fast enough to protect power supply.

The TPS2552/53 is available now in SOT23-6 and 2mm x 2mm SON-6 packaging and is priced at $0.75 in quantities of 1,000.

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