TPS2155数据手册集成电路（IC）的电源管理-专用规格书PDF

描述 Description

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 TPS2155 and TPS2157 have active-high switch enables.

特性 Features

·Two 340-m (Typical) High-Side MOSFETs
·200 mA Low-Dropout Voltage Regulator In Fixed 3.3-V or Adjustable Versions
·Independent Thermal- and Short-Circuit Protection for LDO and Each Switch
·Overcurrent Indicators With Transient Filter
·2.9-V to 5.5-V Operating Range
·CMOS- and TTL-Compatible Enable Inputs
·75-uA (Typical) Supply Current
·Available in 10-Pin MSOP or 14-Pin TSSOP (PowerPAD™)
·-40°C to 85°C Ambient Temperature Range
·APPLICATIONS ·USB Hubs and Peripherals ·Keyboards
·Zip Drives
·Speakers and Headsets
·PDAs and Portable Electronics
·DSP Power Sequencing

PowerPAD is a trademark of Texas Instruments.