Description of BQ25601RTW
For single cell Li-Ion and Li-polymer batteries, the BQ25601RTW device is a fully integrated standalone 3 A switch-mode battery charge management and system power path control device.
Battery life is increased during the discharge phase and switch-mode operating efficiency is optimised by the low impedance power route, which also speeds up battery charging.
The maximum amount of battery charging power is delivered by its input voltage and current regulation. The 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 are all highly integrated into the solution.
In order to simplify system design, BQ25601RTW also combines the bootstrap diode for the high-side gate drive. A broad variety of input sources are supported by the device, including a regular USB host port, a USB charging port, and a high voltage USB adaptor.
Based on the internal USB interface, BQ25601RTW determines the default input current limit. The gadget has input current and voltage management and complies with USB 2.0 and USB 3.0 power specifications.
The input current limit of the device is decided by the value of the ILIM pin setting resistor when the input adapter is not recognised by the device’s built-in USB interface. Additionally, by supplying 5.15 V on VBUS with a constant current limit of up to 1.2 A, the device complies with the USB On-the-Go (OTG) operation power rating specification.
While maintaining a minimum system voltage of 3.5 V, the power path management controls the system just slightly above battery voltage. With the help of this functionality, the system continues to function even when the battery is removed or entirely discharged.
Power path management automatically reduces the charge current to zero when the input current limit or voltage limit is reached. The power path empties the battery until the system power requirement is satisfied as the system load keeps growing.
The Supplement Mode stops the input source from becoming overloaded. Without software control, the gadget starts and finishes a charging cycle. The battery is charged in three phases: pre-conditioning, constant current, and constant voltage after the charger detects the battery voltage.
When the charge current falls below a certain threshold and the battery voltage exceeds the recharge threshold at the end of the charging cycle, the charger automatically shuts off. The charger automatically initiates a new charging cycle if the fully charged battery drops below the recharging threshold.
A charging safety timer, overvoltage and overcurrent protections, as well as monitoring of the battery’s negative temperature coefficient thermistor, are just a few of the charger’s many safety features.
When the junction temperature rises above 110°C, the thermal regulation lowers the charge current. The charging state and any fault circumstances are reported by the STAT output. The 24-pin, 4 mm by 4 mm QFN packaging is offered for the BQ25601RTW family.
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