The CN3056 is a constant current/constant voltage charger circuit for single-cell lithium-ion or lithium-polymer rechargeable batteries. The device includes an internal power transistor and does not require an external current sense resistor and blocking diode. The CN3056 requires only a few external components and complies with the USB bus specification, making it ideal for portable applications. The thermal modulation circuit can control the chip temperature within a safe range when the device power consumption is relatively large or the ambient temperature is relatively high. The modulated output voltage is 4.2V with an accuracy of 1%. The charging current can be adjusted by an external resistor. When the input voltage (AC adapter or USB power supply) is powered off, the CN3056 automatically enters a low-power sleep mode, at which the battery current consumption is less than 3 microamps. Other functions include input voltage under-voltage detection, automatic recharging, chip enable input, battery temperature monitoring and status indication. The CN3056 is packaged in a 10-pin QFN with strong thermal handling capabilities.
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