TPS2148
用于 USB 外设的 3.3V LDO + 双路开关,工作态低电平启用
The 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.
- .
- Complete Power Management Solution for USB Bus-Powered Peripherals
- .
- 3.3-V 200 mA Low-Dropout Voltage Regulator With Enable
- .
- 3.3-V 340-m Typ High-Side MOSFET
- .
- 5-V 340-m 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-uA Typ Supply Current
- .
- Available in 8-Pin MSOP PowerPAD
- .
- -40°C to 85°C Ambient Temperature Range
- .
- APPLICA ONS
- .
- USB Peripherals
- .
- Digital Cameras
- .
- Zip Drives
- .
- Speakers and Headsets
PowerPAD is a trademark of Texas Instruments.