The TPS2148 incorporates two power distribution switches and an LDO in one small package, providing a USB peripheral power management solution that saves up to 60% in board space over typical implementations.

The TPS2148 meets USB 2.0 bus-powered peripheral requirements. An integrated LDO regulates the 5-V bus power down to 3.3 V for the USB controller, and a MOSFET switch that is internally connected to the output of the LDO simplifies meeting the suspend and enumeration current requirements imposed by the USB specification.

A second switch is available to support a downstream port, stage power to a second voltage regulator, or disable power to selected circuitry in power-save modes.

Each power-distribution switch is capable of supplying 200 mA of continuous current, and the independent logic enables are compatible with 5-V logic and 3-V logic. The switches and the LDO are designed with controlled rise times and fall times to minimize current surges.

The TPS2148 has active-low enables while the TPS2158 has active-high enables.

• Complete Power Management Solution for USB Bus-Powered Peripherals
• 3.3-V 200 mA Low-Dropout Voltage Regulator With Enable
• 3.3-V 340-m (Typ) High-Side MOSFET
• 5-V 340-m (Typ) High-Side MOSFET
• Independent Thermal- and Short-Circuit Protection for LDO and Each Switch
• 2.9-V to 5.5-V Operating Range
• CMOS- and TTL-Compatible Enable Inputs
• 75-uA (Typ) Supply Current
• Available in 8-Pin MSOP (PowerPAD?)
• -40°C to 85°C Ambient Temperature Range
• APPLICATIONS
  • USB Peripherals
    • Digital Cameras
    • Zip Drives
    • Speakers and Headsets

PowerPAD is a trademark of Texas Instruments.

• Vin (Min) (V)
• 2.9
• Vin (Max) (V)
• 5.5
• Product type
• Fixed current limit, Power switch, Switch with LDO
• Operating temperature range (C)
• -40 to 100
• Rating
• Catalog

TPS2158的完整型号有：TPS2158IDGN，以下是这些产品的关键参数及官网采购报价：

TPS2158IDGN，工作温度：-40 to 100，封装：HVSSOP (DGN)-8，包装数量MPQ：80个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TPS2158IDGN的批量USD价格：1.32（1000+）

TPS2158IDGN，工作温度：-40 to 100，封装：HVSSOP (DGN)-8，包装数量MPQ：80个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TPS2158IDGN的批量USD价格：1.32（1000+）