The TPS2115APWRG4 can deliver up to 2.5A of current from the USB port, but this is limited by the thermal performance of the package and the PCB design. It's recommended to keep the current below 2A for reliable operation.
The TPS2115APWRG4 has an auto-switch feature that can be enabled by connecting the EN pin to the VBUS pin. This allows the power switch to turn on/off automatically based on the presence of a valid USB voltage on the VBUS pin.
The ILIM pin is used to set the current limit of the power switch. A resistor connected between the ILIM pin and GND sets the current limit. The current limit can be calculated using the formula: I_LIM = 100mA / (R_ILIM / 10kΩ). For example, a 10kΩ resistor sets the current limit to 100mA.
To ensure fast turn-off, it's recommended to add a 10nF capacitor between the EN pin and GND. This capacitor helps to quickly discharge the gate of the internal power MOSFET when the USB device is disconnected.
The TPS2115APWRG4 is a high-current device and requires careful layout and thermal design to ensure reliable operation. It's recommended to follow the layout guidelines in the datasheet, including keeping the power traces short and wide, and using thermal vias to dissipate heat. A thermal pad on the bottom of the package should also be connected to a solid ground plane to improve heat dissipation.
TPS2115APWRG4 datasheet
by Texas Instruments
