FEATURES

Complete Power Management Solution for

USB Bus-Powered Peripherals

3.3-V 200 mA Low-Dropout Voltage Regulator

With Enable

3.3-V 340-mΩ (Typ) High-Side MOSFET

5-V 340-mΩ (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-μA (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

DESCRIPTION

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.