TI introduces tiny USB power management switches with adjustable current limit

TI’s TPS2550 and TPS2551 power switches incorporate an 85-milliohm, N-channel MOSFET in a 2 mm x 2 mm SON or a SOT-23 6-pin package. The devices operate from a wide 2.5 V to 6.5 V 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, 2 micro-second (uS) 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.

Broad portfolio of power management switches The TPS2550 and TPS2551 are part of TI’s broad portfolio of analog power switches, including single, dual, triple and quadruple devices that support typical on-resistance ranging from 33 milliohms to 100 milliohm. TI offers USB power switches with fixed current limits from 100 mA to 2 A, in various package options, including SOT-23, MSOP, SOIC and SON with selectable Enable polarities. In the notebook computer market, TI provides a complete portfolio of power switches, including the TPS2231 that supports an ExpressCard™ interface power slot, the TPS2051B for the memory card slot, and a full portfolio of USB power products.