Texas Instruments Incorporated (TI) (NYSE: TXN) introduced power distribution switches with an integrated FET that can be set to support a 100 mA to 1.1 A 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 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.
As with all power switches from TI, 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.
Key features of TPS2550/51:
- Adjustable current limit, 100 mA to 1100 mA
- Fast over-current response: 2 uS (typical)
- Integrated 85-milliohm high-speed MOSFET
- Reverse input-output voltage protection
- Operating input range of 2.5 V to 6.5 V
- Deglitched fault report
- Enable active low input for TPS2550
- Enable active high input for TPS2551
- 2-uA maximum standby supply current
- Ambient temperature range of -40C to 85C
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-milliohm 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 ExpressCardTM interface power slot, the TPS2051B for the memory card slot, and a full portfolio of USB power products.
Pricing and availability
The TPS2550 and TPS2551 are available today in volume production from TI and its network of distributors. Available in a space-saving 6-pin, 2 mm x 2 mm SON or 6-pin SOT-23 package, the devices’ suggested retail price is $0.70 each in 1,000-piece quantities. Evaluation modules, design application notes, user guides are available through power.ti.com.