TPS2557DRBR TPS2556 Ethernet Switch IC Power Distribution Prec Adj Current-Ltd Pwr-Dist Sw

• Meets USB Current-Limiting Requirements

• Adjustable Current Limit, 500 mA to 5 A (Typical)

• ±6.5% Current-Limit Accuracy at 4.5 A

• Fast Overcurrent Response: 3.5-μs (Typical)

• 22-mΩ High-Side MOSFET

• Operating Voltage: 2.5 V to 6.5 V

• 2-μA Maximum Standby Supply Current

• Built-in Soft Start

• 15-kV and 8-kV System-Level ESD Capable

• UL Listed: File No. E169910 and CB IEC60950-1- am2 ed2.0

2 Applications

• USB Ports and Hubs

• Digital TVs

• Set-Top Boxes

• VOIP Phones

3 Description

The TPS255x power-distribution switch is 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 5 A (typical) through an external resistor. 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 switching into a constant-current mode when the output load exceeds the current-limit threshold. The FAULT logic output asserts low during overcurrent and overtemperature conditions.

Device Information