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.

• Complete Power Management Solution for USB Bus-Powered Hubs
• 3.3-V 200 mA Low-Dropout Voltage Regulator
• Two 5-V 340-m (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-uA (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

PowerPAD is a trademark of Texas Instruments.