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
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
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.
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