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.

• 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-s (Typical)
• 22-mΩ High-Side MOSFET
• Operating Voltage: 2.5 V to 6.5 V
• 2-A 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

• Vin (Min) (V)
• 2.5
• Vin (Max) (V)
• 6.5
• Continuous current (Max) (A)
• 5
• Current limit (A)
• 0.5 to 5.0
• Product type
• Adjustable current limit, Power switch
• Operating temperature range (C)
• -40 to 125
• Enable
• Active High
• Number of switches
• 1
• Rating
• Catalog

TPS2557的完整型号有：TPS2557DRBR、TPS2557DRBT，以下是这些产品的关键参数及官网采购报价：

TPS2557DRBR，工作温度：-40 to 125，封装：SON (DRB)-8，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS2557DRBR的批量USD价格：.4（1000+）

TPS2557DRBT，工作温度：-40 to 125，封装：SON (DRB)-8，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS2557DRBT的批量USD价格：.48（1000+）

TPS2557DRBEVM-423 TPS2557DRBEVM-423：用于 TPS2557 的评估模块

TPS2556EVM-423 和 TPS2557EVM-423 是评估模块 (EVM)，适用于德州仪器 (TI) 的具有可调节限流的配电开关。这些 EVM 在 2.5V 至 6.5V 的电压范围内工作。板载跳线将输出限流设置为 0.5A 或 1A。该电路板设计用于 5A 电流功能的 TPS2556 或 TPS2557。测试点允许方便快捷地访问所有关键节点电压。