TPS2148 - 用于 USB 外设的 3.3V LDO + 双路开关，工作态低电平启用

TPS2148是TI德州仪器公司的一款含LDO的开关产品，TPS2148是用于 USB 外设的 3.3V LDO + 双路开关，工作态低电平启用，本站介绍了TPS2148的封装应用图解、特点和优点、功能等，并给出了与TPS2148相关的TI元器件型号供参考。

TPS2148 - 用于 USB 外设的 3.3V LDO + 双路开关，工作态低电平启用 - 含LDO的开关 - USB电源和充电端口控制器 - 德州仪器

产品描述

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.

产品特性

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.

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