FEATURES

Complete Power Management Solution for

USB Bus-Powered Hubs

3.3-V 200 mA Low-Dropout Voltage Regulator

Two 5-V 340-mΩ (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-μA (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

DESCRIPTION

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.