1 Features 1• Up to 1.5-A Maximum Load Current • ±6% Current-Limit Accuracy at 1.7 A (Typical) • Meets USB Current-Limiting Requirements • Backwards Compatible With TPS2550 and TPS2551 • Adjustable Current Limit: 75 mA to 1700 mA (Typical) • Constant-Current (TPS255x) and Latch-Off (TPS255x-1) Versions • Fast Overcurrent Response - 2 µs (Typical) • 85-mΩ High-Side MOSFET (DBV Package) • Reverse Input-Output Voltage Protection • Operating Range: 2.5 V to 6.5 V • Built-In Soft Start • 15-kV ESD Protection per IEC 61000-4-2 (With External Capacitance) • UL Listed – File No. E169910 and NEMKO IEC60950-1-am1 ed2.0 • See the TI Switch Portfolio 2 Applications • USB Ports and Hubs • Digital TVs • Set-Top Boxes • VOIP Phones 3 Description The TPS255x and TPS255x-1 power-distribution switches are intended for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered and provide up to 1.5 A of continuous load current. These devices offer a programmable current-limit threshold between 75 mA and 1.7 A (typical) through an external resistor. Current-limit accuracy as tight as ±6% can be achieved at the higher current-limit settings. The power-switch rise and fall times are controlled to minimize current surges during turnon and turnoff. TPS255x devices limit the output current to a safe level by using a constant-current mode when the output load exceeds the current-limit threshold. TPS255x-1 devices provide circuit breaker functionality by latching off the power switch during overcurrent or reverse-voltage situations. An internal reverse-voltage comparator disables the powerswitch when the output voltage is driven higher than the input to protect devices on the input side of the switch. The FAULT output asserts low during overcurrent and reverse-voltage conditions.