TPS2149 - 用于 USB 集线器的 3.3V LDO + 双路开关，工作态低电平启用

TPS2149是TI德州仪器公司的一款含LDO的开关产品，TPS2149是用于 USB 集线器的 3.3V LDO + 双路开关，工作态低电平启用，本站介绍了TPS2149的封装应用图解、特点和优点、功能等，并给出了与TPS2149相关的TI元器件型号供参考。

TPS2149 - 用于 USB 集线器的 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 TPS2149 incorporates two power distribution switches and an LDO in one small package, providing a USB bus-powered hub power management solution that saves up to 60% in board space over typical implementations.

The TPS2149 meets USB 2.0 bus-powered hub requirements. An integrated LDO regulates the 5-V bus power down to 3.3 V for the USB controller. The two MOSFET switches provide power to the downstream ports. With independent enables, the downstream ports remain unpowered until the hub completes enumeration.

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 TPS2149 has active-low enables while the TPS2159 has active-high enables.

产品特性

Complete Power Management Solution for USB Bus-Powered Hubs
3.3-V 200 mA Low-Dropout Voltage Regulator
Two 5-V 340-m (Typ) High-Side MOSFETs
Independent Thermal- and Short-Circuit Protection for LDO and Each Switch
Overcurrent Indicator With Transient Filter
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 Bus-Powered Hubs
  - Keyboards
  - Monitors
  - Hub Boxes

PowerPAD is a trademark of Texas Instruments.

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