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http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq25730″>View Datasheet
Texas Instruments bq25730 Buck-Boost Battery Charge Controller is a synchronous NVDC 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. The Narrow VDC buck-boost architecture avoids direct power path from the input source to system voltage which implements a wide input voltage range and narrow system voltage range at the same time. A narrow system voltage range is valuable for faster battery supplement and a lower MOSFET rating for the next stage converter.
The NVDC configuration allows the system to be regulated based on battery voltage but not drop below the system’s minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery goes into supplement mode and prevents the system from crashing. 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 transitions between the buck, boost, and buck-boost operation modes without host control.
In the absence of an input source, the Texas Instruments bq25730 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.
