TPS2149

用于 USB 集线器的 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 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.

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Complete Power Management Solution for USB Bus-Powered Hubs

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3.3-V 200 mA Low-Dropout Voltage Regulator

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Two 5-V 340-m Typ High-Side MOSFETs

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Independent Thermal- and Short-Circuit Protection for LDO and Each Switch

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Overcurrent Indicator With Transient Filter

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2.9-V to 5.5-V Operating Range

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CMOS- and TTL-Compatible Enable Inputs

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75-uA Typ Supply Current

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Available in 8-Pin MSOP PowerPAD™

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-40°C to 85°C Ambient Temperature Range

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APPLICA ONS

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USB Bus-Powered Hubs

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Keyboards

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Monitors

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Hub Boxes

PowerPAD is a trademark of Texas Instruments.