TPS2541RTER

电源开关 IC - 配电 USB Charging Port Pwr Swtch &Contrller

The TPS2540/40A and TPS2541/41A 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 TPS2540/40A/41/41A monitors D+ and D-, providing the correct hand-shaking protocol with compliant client devices.

The TPS2540/40A/41/41A supports the following charging logic schemes:

CTL1-CTL3 logic inputs are used to select one of the various charge modes provided by the TPS2540/40A and TPS2541/41A . These charge modes allow the host device to actively select between Dedicated Charging Port DCP wall-adapter emulation, Charging Downstream Port CDP active USB 2.0 data communications with 1.5-A support, or Standard Downstream Port SDP USB 2.0 Mode active USB 2.0 data communications with 500-mA support. The TPS2540/40A/41/41A also integrates an

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*auto-detect** feature that supports both DCP schemes for Battery Charging Specification BC1.2 and the Divider Mode without the need for outside user interaction.

The TPS2540A auto detect mode also has a longer detach detection time, so that it can support certain unique non-compliant devices. The TPS2540/40A/41/41A power-distribution switch is intended for applications where heavy capacitive loads and short-circuits are likely to be encountered, incorporating a 73-mΩ, N-channel MOSFET in a single package. Constant-current mode is used when the output load exceeds the current-limit threshold. ILIM_SEL logic input selects one of two current-limit thresholds, each one being individually adjustable via an external resistor. Additional USB switch features include a de-glitched output fault reporting FAULT, and a logic-level enable EN TPS2540/40A or OUT discharge control DSC TPS2541. With the TPS2540/40A, the mode “000” is used to force an output discharge.