CN3130

CN3130 is a rechargeable coin cell battery charge management IC that can be powered by a solar panel. The device integrates an internal power transistor, eliminating the need for external current sense 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, maximizing utilization of the input source's current delivery capacity. This makes it well suited for applications powered by current-limited sources such as solar panels. CN3130 requires minimal external components, making it ideal for portable applications. A thermal regulation circuit keeps the die temperature within a safe range when power dissipation is high or ambient temperature is elevated. The internal fixed constant-voltage charge voltage is 3.3V, which can also be adjusted upward via an external resistor, making it suitable for charging coin-type lithium manganese batteries, LiFePO₄ batteries, and lithium batteries. The charge current is set by an external resistor. When the input voltage is removed, CN3130 automatically enters a low-power sleep mode, in which the battery current consumption is less than 3μA. Additional features include input undervoltage lockout, automatic recharge, and charge status indication. CN3130 is available in a 6-pin SOT23 package (SOT23-6).

Applications

• Wearable devices
• Smart home
• Medical devices
• Calculators
• Water meters, gas meters, electricity meters, etc.
• Measuring instruments, sensors, etc.

Key features

• Automatically adjusts charge current based on input voltage source current output capability
• Compatible with limited-current voltage sources such as solar panels
• Suitable for charging coin-cell lithium-manganese, LiFePO₄, and lithium batteries
• Input voltage range: 3.9V to 6V
• Integrated power transistor
• No external blocking diode or current sense resistor required
• Constant voltage charging at 3.3V, adjustable upward via external resistor
• Can be used as a voltage source
• Internal soft-start circuit
• Trickle charge mode at low battery voltage for activating deeply discharged batteries and reducing power consumption
• Programmable constant current charge range: 10mA to 300mA
• CC/CV/constant temperature charging mode maximizes charge current while preventing overheating
• Automatically enters low-power sleep mode upon input power loss
• Charge status indicator output
• C/10 end-of-charge detection
• Automatic recharge
• Package: SOT23-6
• Lead-free, RoHS compliant, halogen-free