How about the lithium battery charging management chip CN3052A?

High-performance linear lithium battery charge management chip CN3052A / CN3052B / CN3056, these devices integrate power tube, do not need external current sense resistor and blocking diode, only need few peripheral components, and comply with USB bus technical specifications It can charge the lithium battery through the USB port, so it is very suitable for various chargers and MP4 players, Bluetooth headsets, digital cameras, and other portable products.

Pin arrangement

CN3052A / CN3052B CN3056 main function introduction

Power Supply Low Voltage Detection (UVLO) CN3052A / CN3052B CN3056 has a power supply voltage detection circuit. When the power supply voltage is lower than the power supply voltage low threshold (typical value 4.03 v), the chip is in the off state and charging is disabled.

Sleep mode CN3052A / CN3052B CN3056 has a sleep comparator inside. When the input voltage VIN is less than the battery terminal voltage + 40 mv, the charger is in sleep mode. Only when the input voltage VIN rises above the battery terminal voltage of 90 mv, the charger can Leave sleep mode and enter the normal working condition.

 Pre-charge state at the beginning of the charging cycle and the charger charges the battery at 10% of the charge current in the constant current charge mode.

When the input voltage is greater than the power low voltage detection threshold and the chip enable input is connected to the high level, the CN3052A / CN3052B CN3056 starts to charge the battery, and the CHRG pin outputs a low level, indicating that charging is in progress.

If the battery voltage is below 3 v, the charger pre-charges the battery with a small current. When the battery voltage exceeds 3 v, the charger charges the battery in constant current mode, and the charging current is determined by the resistance RISET between the ISET pin and ground. When the battery voltage is close to the battery terminal modulation voltage 4.2 v, the charging current is gradually reduced, and the CN3052A / CN3052B CN3056 enters the constant voltage charging mode. When the charging current decreases to the charging end threshold, the CHRG terminal outputs a high-impedance state, indicating that the charging cycle ends, and the charging end threshold is 10% of the constant current charging current.

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