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    The XYT4057 is a highly integrated and reliable single lithium battery linear charging chip that can use an AC power adapter or USB port as its power input. When the power supply is removed, the XYT4057 enters sleep mode. The XYT4057 chip charging system integrates 3 loops: charging constant current, charging constant voltage, and temperature constant loop, providing excellent performance for the charging system.

    The XYT4057 optimizes the charging process by using a control algorithm that includes pre-charge mode, fast charge mode and constant voltage mode. When fully charged, it is maintained in constant voltage mode to ensure that the battery is always fully charged. Its charging current can be set by an external resistor with a charging current configuration up to 1A. The internal thermal feedback circuit of the chip adjusts the core temperature to ensure that the battery is charged at the best rate under any available ambient temperature. Simply put, this function is that the chip temperature will rise at the beginning of charging, resulting in a certain decrease in charging current as the temperature increases. When the internal temperature loop reaches stability, the charging current tends to stabilize. Achieve the effect of constant temperature charging. The VIN end of the XYT4057 can withstand voltages up to 32V, and it also integrates various protection functions: input overvoltage, input undervoltage, output overvoltage, output short circuit, chip overtemperature.

    XYT4057 can be provided in SOT23-6, SOT23-5, ESOP8 and DFN6 package, among which XYT4057S adopts SOT23-6 package; XYT4057S5 in SOT23-5 package; XYT4057E adopts ESOP8 package; The XYT4057D is packaged in DFN6.