Description:

The TPS255x and TPS255x-1 power-distributionswitches are intended for applications whereprecision current limiting is required or heavycapacitive loads and short circuits are encounteredand provide up to 1.5 A of continuous load current.These devices offer a programmable current-limitthreshold between 75 mA and 1.7 A (typical) throughan external resistor. Current-limit accuracy as tight as±6% can be achieved at the higher current-limitsettings. The power-switch rise and fall times arecontrolled to minimize current surges during turnonand turnoff.TPS255x devices limit the output current to a safelevel by using a constant-current mode when theoutput load exceeds the current-limit threshold.TPS255x-1 devices provide circuit breakerfunctionality by latching off the power switch duringovercurrent or reverse-voltage situations. An internalreverse-voltage comparator disables the powerswitch when the output voltage is driven higher thanthe input to protect devices on the input side of theswitch. The FAULT output asserts low duringovercurrent and reverse-voltage conditions.

Features:

• 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 andTPS2551

• 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 (WithExternal Capacitance)

• UL Listed – File No. E169910 and NEMKOIEC60950-1-am1 ed2.0

• See the TI Switch Portfolio

Applications:

• USB Ports and Hubs

• Digital TVs

• Set-Top Boxes

• VOIP Phones