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.