TPS2145 - 用于 USB、DSP 和便携应用领域的可调节 LDO + 双路开关，工作态低电平启用

TPS2145是TI德州仪器公司的一款含LDO的开关产品，TPS2145是用于 USB、DSP 和便携应用领域的可调节 LDO + 双路开关，工作态低电平启用，本站介绍了TPS2145的封装应用图解、特点和优点、功能等，并给出了与TPS2145相关的TI元器件型号供参考。

TPS2145 - 用于 USB、DSP 和便携应用领域的可调节 LDO + 双路开关，工作态低电平启用 - 含LDO的开关 - USB电源和充电端口控制器 - 德州仪器

产品描述

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.

产品特性

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.

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