TI Introduces Tiny USB Power Management Switches With Adjustable Current Limit
Texas Instruments Inc. (TI) introduced power distribution switches with an integrated FET that can be set to support a 100mA to 1.1A current limit range for a standard USB port or other applications requiring a current limited switch. The power management integrated circuit (IC) efficiently protects an input voltage supply against potential short-circuit conditions that may occur when using a USB connection in a mobile phone, notebook computer, LCD TV, set-top box, gaming system or IP phone.
TI’s TPS2550 and TPS2551 power switches incorporate an 85mΩ, N-channel MOSFET in a 2 x 2mm SON or a SOT-23 6-pin package. The devices operate from a wide 2.5 to 6.5V input and minimize current surges during heavy capacitance loads by controlling rise and fall times.
The TPS2550 and TPS2551 offer several protection features. The devices’ fast, 2µS over-current response limits the output current to a safe level by switching into a constant-current mode when the output load exceeds the current-limit threshold or a short circuit is present. The devices also feature an internal reverse-voltage blocking function to disable the power switch in case the output voltage is driven higher than the input voltage to protect the application’s system on the input side of the switch. In addition, a /FAULT logic output asserts at low condition during over-current and reverse-voltage conditions.
The TPS2550 and TPS2551 are available in volume production from TI and its network of distributors. Available in a space-saving 6-pin, 2 x 2mm SON or 6-pin SOT-23 package, the devices’ suggested retail price is $0.70 each in 1,000-piece quantities.
