BQ2057CTSG4

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• BQ2057CTSG4 application field and working principle

  BQ2057CTSG4 IC is primarily used in low drop-out voltage Linear battery charger applications, it is a battery charger controller IC from Texas Instruments. It is an efficient, linear charge path battery charger solution for the majority of portable applications that require Lithium-ion or Lithium-ion polymer batteries. It is designed for wall adapter and USB source applications.

  BQ2057CTSG4 can be used in many different applications, such as smartphones, tablets, digital cameras, fitness bands, portable healthcare equipment and laptop adapters, among others. The design of the IC is based on a unique charge algorithm that monitors the state of the battery during charging, and initiates a preset charging profile, depending on the state of the battery. The IC requires a minimum amount of external components, and has a low quiescent current consumption. BQ2057CTSG4 can operate with input voltages ranging from 5.5V to 17V, and automatically detects the charging process between USB and wall adapter sources.

  BQ2057CTSG4 is designed to work as a system-critical component, as it controls the thermal and safety protections of the device, and ensures that the battery is correctly charged. The embedded algorithm monitors the battery throughout the charging process, controlling the current and voltage flow. An additional benefit of the IC is the presence of its built-in ESR detection circuit, which provides additional protection against over-charging of the battery.

  Working Principle

  The working principle of the BQ2057CTSG4 is based on the USB or wall adapter input that provides power to dropout-controlled charge path. The charging current is maintained to a constant level determined by the external resistor. As soon as the change controller receives the power from the adapter, it initiates the charging process by regulating the current according to set parameters. The current is then amplified by the internal MOSFET, and proceeds to charge the battery. The trickle-charge portion is achieved by adjusting the voltage level of the precision feedback loop. The IC also monitors the battery temperature, which is used to adjust the charge currents. The voltage source is also monitored for faults, which can trigger the safety features of the circuit, such as over-charging protection, over-temperature protection, and reverse-polarity protection.

  Throughout the charging process, the internal microcontroller monitors the charge level and temperature at regular intervals. Once the preset parameters are met, the controller will stop the charging process and switch off the MOSFET. Thus, by monitoring the battery level, temperature, and charging current, BQ2057CTSG4 can ensure that the battery is safely charged without over-charging.

  Conclusion

  BQ2057CTSG4 is a highly efficient, low drop-out voltage Linear battery charger controller. It is designed for wall adapter and USB source applications, and can be used for a variety of applications such as smartphones, tablets and digital cameras. The IC is designed to work as a system-critical component, monitoring the battery status throughout the charging process. The charging current is regulated and maintained to a constant level determined by the external resistor, and the trickle-charge portion is achieved by adjusting the voltage level of the precision feedback loop. The IC also provides additional protection against over-charging, over-temperature and reverse polarity.

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