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.