原标题：TI TPS2540 USB端口电源充电解决方案

　　TI 公司的TPS2540和TPS2541集合了限流的USB端口电源开关和USB 2.0高速数据线(D+/D-)开关以及USB充电端口识别电路, 满足USB 2.0 BC1.2 (draft)和中国电信标准YD/T 1591-2009, USB 2.0数据带款2.6GHz,可调限流高达2.8A,主要用在笔记本电脑和其它智能USB主设备以及通用墙充电适配器.本文介绍了TPS2540和TPS2541主要特性,方框图以及典型应用框图, TPS2540 和TPS2541 EVM评估模块电路图和材料清单(BOM).

　　The TPS2540 and TPS2541 are a combination of current-limited USB port power switch with a USB 2.0 high-speed data line (D+/D-) switch and a USB charging port identification circuit. Applications include notebook PCs and other intelligent USB host devices. The wide bandwidth (2.6 GHz) data-line switch also features low capacitance and low on resistance, allowing signals to pass with minimum edge and phase distortion. The TPS2540/41 monitors D+ and D-, providing the correct hand-shaking protocol with compliant client devices.

　　The TPS2540/41 supports the following charging logic schemes:

　　USB 2.0 BC1.2 (draft)

　　Chinese Telecom Standard YD/T 1591-2009

　　Divider Mode, compliant with Apple devices such as iPod and iPhone

　　CTL1-CTL3 logic inputs are used to select one of the various charge modes provided by the TPS2540 and TPS2541.

　　TPS2540和TPS2541主要特性:

　　Meets Battery Charging Specification BC1.2 (draft) for DCP and CDP

　　Meets Chinese Telecommunications Industry Standard YD/T 1591-2009

　　Supports Sleep-Mode Charging for Most Available Apple Devices and/or BC1.2 (draft) Compliant Devices

　　Compatible With USB 2.0 and 3.0 Power Switch Requirements

　　2.6-GHz Bandwidth USB 2.0 Data Switch

　　73-mohm(typ.) High-Side MOSFET

　　Adjustable Current Limit up to 2.8 A (typical)

　　OUT Discharge Through CTLx=000 (TPS2540) or DSC (TPS2541) Input

　　Available in 16-Pin QFN Package

　　TPS2540和TPS2541应用:

　　USB Ports/Hubs

　　Notebook PCs

　　Universal Wall Charging Adapter

　　图1.TPS2540/41方框图

　　图2.TPS2540典型应用框图

　　图3.TPS2541采用单个STATE控制信号的应用电路图

　　图4.TPS2540采用STATE和ADAPTER控制信号的应用电路图

　　TPS2540 和TPS2541 EVM评估模块

　　The TPS2540/1EVM allows reference circuit evaluation of the TI TPS2540 and TPS2541 USB charging port power switch and controller.

　　图5.TPS2540 和TPS2541 EVM评估模块外形图

　　TPS2540 和TPS2541 EVM评估模块主要特性:

　　• Integrated Charging Host Port Controller and Current-limited Power Switch

　　• Meets Battery Charging Specification 1.1 for Dedicated and Host Charging Ports for USB Host Devices

　　• Supports Sleep-Mode Charging for Most Available Apple® and/or BC1.2 Compliant Devices

　　• Backwards Compatible with USB 2.0 Power Switch Requirements

　　• Adjustable Current-limit, 270 mA – 2700 mA

　　• Fast Over-current Response – 1 μS Typical

　　• 80-mΩ High-Side MOSFET

　　• Operating Range: 4.5 V to 5.5 V

　　TPS2540 和TPS2541 EVM评估模块应用:

　　• USB Ports/Hubs

　　• Notebook PCs

　　图6.TPS2540/41 EVM评估模块电路图

　　TPS2540 和TPS2541 EVM评估模块材料清单(BOM):