TPS2555

www.ti.com TPS2554 TPS2555 SLVSAM0 – JUNE 2011 Precision Adjustable Current-Limited, Power-Distribution Switches Check for Samples: TPS2554, TPS2555 FEATURES 1 2 Meets USB Current-Limiting Requirements Adjustable Current Limit, 500 mA to 2.5 A (typ) Two Independently-Settable, Current-Limit Thresholds Fast Overcurrent Response - 1.5 μs (typ) 73-mΩ High-Side MOSFET 3.8-μA Maximum Standby Supply Current PowerPAD™ Thermal Management Automatic Output Discharge when Disabled Both High-Enable (TPS2554) and Low-Enable (TPS2555) Versions Available APPLICATIONS USB Ports/Hubs Digital TV Set-Top Boxes VOIP Phones DESCRIPTION The TPS2554/55 power-distribution switches are intended for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. These devices offer a programmable current-limit threshold between 500 mA and 2.5 A (typ) via an external resistor. TPS2554/55 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. The FAULT logic output asserts low during overcurrent and over-temperature conditions. TPS2554/55 DRC Package and Typical Application Diagram TPS2554/TPS2555 DRC PACKAGE (TOP VIEW) GND 1 IN 2 IN 3 ILIM_SEL 4 EN/EN 5 10 FAULT 9 OUT PAD 8 OUT 7 ILIM0 6 ILIM1 4.5 V to 5.5 V FAULT Signal RFAULT Power Switch Enable TPS2554/55 2/3 IN OUT 8/9 100 nF 10 FAULT ILIM_SEL 4 ILIM0 7 ...