Texas Instruments bq25611D 3.0A Buck Battery Charger

The Texas Instruments bq25611D also integrates the bootstrap diode for the high-side gate drive for simplified system design. The I²C serial interface with charging and system settings makes the device a truly flexible solution. The device supports a wide range of input sources, including a standard USB host port, USB charging port, USB-compliant high voltage adapter, and wireless power. It complies with USB 2.0 and USB 3.0 power specs with input current and voltage regulation. The device takes the result from the detection circuit in the system, such as a USB PHY device. The device integrates the buck charger and the boost regulator into one solution with a single inductor. It meets USB On-The-Go (OTG) operation power rating specification by supplying 5V (adjustable 4.6V/4.75V/5V/5.15V) with a constant current limit up to 1.2A.

The Power Path management regulates the system slightly above battery voltage but does not drop below 3.5V minimum system voltage (programmable) with an adapter applied. With this feature, the system maintains operation even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the Power Path management automatically reduces the charge current. As the system load continues to increase, the battery starts to discharge the battery until the system power requirement is met. This supplement mode prevents overloading the input source.