TPS2155

用于 USB、DSP 和便携应用领域的可调节 LDO + 双路开关，工作态高电平启用

Two power-distribution switches and an adjustable TPS2145 or fixed TPS2147 LDO are incorporated in one small package, providing a power management solution that saves up to 60% in board space over typical implementations.

Designed to meet USB 2.0 bus-powered hub requirements, these devices also allow core and I/O voltage sequencing in DSP applications, or power segmentation in portable equipment. Each current-limited switch is a 340-m N-channel MOSFET capable of supplying 200 mA of continuous current. A logic enable compatible with 5-V logic and 3-V logic controls each MOSFET as well as the LDO in the TPS2145. The internal charge pump provides the gate drive controlling the power-switch rise times and fall times, minimizing current surges during switching. The charge pump requires no external components.

The LDO has a drop-out voltage of only 0.35 V and with the independent enable on the TPS2145 LDO, the LDO can be used as an additional switch. The LDO output range for the TPS2145 is 1 V to 3.3 V, while the TPS2147 is fixed at 3.3 V.

The TPS2145 and TPS2147 have active-low switch enables and the and TPS2157 have active-high switch enables.

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Two 340-m Typical High-Side MOSFETs

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200 mA Low-Dropout Voltage Regulator In Fixed 3.3-V or Adjustable Versions

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

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Overcurrent Indicators 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 Typical Supply Current

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Available in 10-Pin MSOP or 14-Pin TSSOP PowerPAD™

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-40°C to 85°C Ambient Temperature Range

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APPLICA ONS

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USB Hubs and Peripherals

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Keyboards

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Zip Drives

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Speakers and Headsets

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PDAs and Portable Electronics

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DSP Power Sequencing

PowerPAD is a trademark of Texas Instruments.