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http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq25731″>View Datasheet
Texas Instruments bq25731 Buck-Boost Battery Charge Controller is a synchronous buck-boost battery charge controller. It can be used to charge a 1- to 5-cell battery from a wide range of input sources, including a USB adapter, high voltage USB-C Power Delivery (PD) sources, and traditional adapters. It offers a low component count, high-efficiency solution for space-constrained, 1- to 5-cell battery charging applications. During power-up, the charger sets the converter to a buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger seamlessly transits between the buck, boost, and buck-boost operation modes without host control.
In the absence of an input source, the Texas Instruments bq25731 supports the USB On-the-Go (OTG) function from a 1- to 5-cell battery to generate an adjustable 3V to 24V output on VBUS with 8mV resolution. The OTG output voltage transition slew rate can be configured to comply with the USB-PD 3.0 PPS specification. The latest version of the USB-C PD specification includes Fast Role Swap (FRS) to ensure power role swapping occurs in a timely fashion so that the device(s) connected to the dock can avoid experiencing momentary power loss or glitching. This device integrates FRS in compliance with the PD specification.
