Texas Instruments bq25628/bq25629 Battery Charger IC

     Texas Instruments BQ25628/BQ25629 Battery Charger IC is a highly integrated 2A switch mode battery charge management and system power path management device for single lithium-ion and lithium polymer batteries. The solution is highly integrated with built-in current detection, loop compensation, input reverse blocking FeTs (RBFET, Q1), high-side switch FeTs (HSFET, Q2), low-side switch FeTs (LSFET, Q3), and battery FeTs (BATFET, Q4) between the system and the battery.

     The device uses narrow-VDC power path management to adjust the system voltage to slightly above the battery voltage, but not below the configurable minimum system voltage. The low-impedance power supply path optimizes switching mode operation efficiency, shorters battery charging time, prolongs battery life during discharge phase, and extends battery shelf life with ultra-low 0.15µA transport mode current. The I2C serial interface with charging and system setup capabilities makes the BQ25628 and BQ25629 a truly flexible solution.

     The BQ25628 supports a variety of input sources, including standard USB host ports, USB charging ports, and USB standard compliant high voltage adapters. The BQ25629 has an ILIM pin for setting default input current limits and a TS_BIAS pin for controlling thermistor bias. The device complies with USB 2.0 and USB 3.0 power specifications for input current and voltage regulation, and conforms to USB On-the-Go (OTG) operating power ratings up to 2.0A.

     Texas Instruments bq25628/bq25629 provides a variety of safety features for battery charging and system operation, including battery negative temperature coefficient theristor monitoring, charging safety timers, and overvoltage and overcurrent protection. When junction temperature exceeds the programmable threshold, thermal regulation reduces the charging current. The STAT output reports the charging status and any failures. Other safety features include battery temperature sensing for charging mode and OTG boost mode, heat off, and input UVLO and overvoltage protection. The INT output notifies the host of a failure or state change. The BQ25628 andBQ25629 come in 18-pin, 2.5mm × 3.0mm WQFN package.