Texas Instruments' bq25606 device is a highly integrated standalone 3 A switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer batteries. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, and extends battery life during discharging phase.

The bq25606 is a highly integrated standalone 3 A switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer batteries. It features fast charging with high input voltage support for a wide range of standalone chargers and portable devices. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, and extends battery life during discharging phase. Its input voltage and current regulation deliver maximum charging power to battery. The solution is highly integrated with input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. It also integrates the bootstrap diode for the high-side gate drive for simplified system design.

The device supports a wide range of input sources, including standard USB host port, USB charging port, and USB compliant high voltage adapter. The device sets default input current limit based on the built-in USB interface. The device is compliant with USB 2.0 and USB 3.0 power spec with input current and voltage regulation. When the device built-in USB interface identifies the input adapter is unknown, the device’s input current limit is determined by the ILIM pin setting resistor value. The device also meets USB On-the-Go (OTG) operation power rating specification by supplying 5.15 V on V_BUS with constant current limit up to 1.2 A.

The power path management regulates the system slightly above battery voltage but does not drop below 3.5 V minimum system voltage. 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 to zero. As the system load continues to increase, the power path discharges the battery until the system power requirement is met. This Supplement Mode prevents overloading the input source.

The device initiates and completes a charging cycle without software control. It senses the battery voltage and charges the battery in three phases: pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit and the battery voltage is higher than recharge threshold. If the fully charged battery falls below the recharge threshold, the charger automatically starts another charging cycle.

The charger provides various safety features for battery charging and system operations, including battery negative temperature coefficient thermistor monitoring, charging safety timer, and overvoltage and overcurrent protections. The thermal regulation reduces charge current when the junction temperature exceeds 110°C. The STAT output reports the charging status and any fault conditions.

The device family is available in 24-pin, 4 mm x 4 mm QFN package.