TPS2149

TPS2149 TPS2159 SLVS401 − AUGUST 2001 3.3ĆV LDO AND DUAL SWITCH FOR USB BUSĆPOWERED HUB POWER MANAGEMENT FEATURES D Complete Power Management Solution for USB Bus-Powered Hubs D 3.3-V 200 mA Low-Dropout Voltage Regulator D Two 5-V 340-mΩ (Typ) High-Side MOSFETs D Independent Thermal- and Short-Circuit Protection for LDO and Each Switch D Overcurrent Indicator With Transient Filter D 2.9-V to 5.5-V Operating Range D CMOS- and TTL-Compatible Enable Inputs D 75-µA (Typ) Supply Current D Available in 8-Pin MSOP (PowerPAD) D −40°C to 85°C Ambient Temperature Range APPLICATIONS D USB Bus-Powered Hubs − Keyboards − Monitors − Hub Boxes DESCRIPTION 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...