CN3142

Is a single-cell lithium battery charge management IC that can be powered by solar energy. The device integrates power transistors internally, eliminating the need for external current sensing resistors and blocking diodes. The internal adaptive charge current module automatically adjusts the charge current based on the current output capability of the input power supply, so users do not need to consider worst-case scenarios and can maximize the utilization of the input power supply's current output capability. This makes it ideal for lithium battery charging applications powered by sources with limited current output capability, such as solar panels. Only minimal external components are required, making it highly suitable for portable applications. The thermal regulation circuit controls the chip temperature to approximately 132°C when the device dissipates significant power or operates in high ambient temperatures, preventing overheating. The charge current is set via an external resistor, with a minimum constant current charge setting down to milliamps, making it ideal for small-capacity battery charging applications. When the input voltage is removed, the device automatically enters a low-power sleep mode, during which the battery current is less than microamps. Other features include input undervoltage lockout, automatic recharge, standard-compliant battery temperature monitoring, charge current overcurrent protection, and charge status indication.

Applications

• Medical instruments
• Beauty and skincare devices
• Solar chargers
• Portable devices
• Various standalone chargers

Key features

• Input voltage range: to
• Integrated adaptive charge current module that automatically adjusts charge current based on the current output capability of the input voltage source
• Compatible with limited-current voltage sources such as solar panels
• Constant voltage charge voltage: 4.2V±1%
• Configurable sustained constant current charge current up to 400mA
• Configurable minimum constant current charge current as low as 3mA
• Charge overcurrent protection prevents damage from ISET pin short circuit or incorrect use of abnormally low resistance
• Can be used as a voltage source
• Internal soft-start circuit
• Trickle charge mode at low battery voltage to activate deeply discharged batteries and reduce power consumption
• CC/CV/constant temperature charging mode maximizes charge current while preventing chip overheating
• Automatically enters low-power sleep mode when supply voltage drops
• Status indicator output
• Automatic recharge
• Standard-compliant battery temperature monitoring
• Package type:
• Lead-free, compliant with, halogen-free