描述 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 power-switch 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.

特性 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 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