TPS2074DB.A中文资料德州仪器数据手册PDF规格书

Complete USB Hub Power Solution

Meets USB Specifications 1.1 and 2.0

Independent Thermal and Short-Circuit

Protection

3.3-V Regulator for USB Hub Controller

Overcurrent Logic Outputs

4.5-V to 5.5-V Operating Range

CMOS- and TTL-Compatible Enable Inputs

185 μA Bus-Power Supply Current

Available in 24-Pin SSOP Package

–40°C to 85°C Ambient Temperature Range

description

The TPS2074 and TPS2075 provide a complete

USB hub power solution by incorporating three

major functions: current-limited power switches

for four ports, a 3.3-V 100-mA regulator, and a

DP0 line control to signal attach/detach of the hub.

These devices are designed to meet bus-powered

and self-powered hub requirements. These

devices are also designed for hybrid hub

implementations and allow for automatic switching

from self-powered mode to bus-powered

mode if loss of self-power is experienced. This

feature can be disabled by applying a logic high to

the BP_DIS input

Each port has a current-limited 100-mΩ Nchannel

MOSFET high-side power switch for

500 mA self-powered operation. Each port also

has a current-limited 500-mΩ N-channel MOSFET

high-side power switch for 100-mA buspowered

operation. All the N-channel MOSFETs

are designed without parasitic diodes, preventing

current backflow into the inputs.

For applications where a 5-V regulator is needed,

use the TPS2070 or TPS2071 device.