Overview: CN3140 is a single-cell lithium battery charge management chip that can be powered by solar energy. The device includes an internal power transistor and does not require an external current detection resistor or blocking diode. The internal adaptive charging current module automatically adjusts the charging current according to the current output capability of the input power supply. Users do not need to consider the worst-case scenario, maximizing the use of the input power supply's current output capability. This makes it ideal for lithium battery charging applications powered by power supplies with limited current output capabilities, such as solar panels. CN3140 requires very few external components, making it ideal for portable applications. The thermal modulation circuit can control the chip temperature to around 132℃ when the device's power consumption is high or the ambient temperature is high, preventing the chip from overheating. The charging current is set by an external resistor, with a minimum constant current charging current as low as 3 mA, making it ideal for charging small-capacity batteries. When the input voltage is cut off, CN3140 automatically enters a low-power sleep mode, with a battery current of less than 3 μA. Other functions include input undervoltage latch, automatic recharging, JEITA-compliant battery temperature monitoring, overcurrent protection during charging, and charging status indication. CN3140 is available in a 2mm*2mm 6-pin DFN package.

Product Parameters

Main Functions: 400mAh single-cell lithium battery charging management integrated circuit with solar power

Operating Mode: Linear

Battery Type: Lithium-ion battery

Number of Batteries: 1

Input Voltage: 4.5V-6V

Output Voltage Range: 0V-4.2V

Maximum Charging Current: 400mA

Maximum Output Current: 400mA

Operating Current: 390uA

Solar Power: Yes

Thermal Modulation: Yes

Package Type: DFN6 (2mm*2mm)

Chip Enable: No

Built-in Power MOSFET: Yes

Features:

l Input voltage range: 4.5V to 6V

l Internally integrated charging current adaptive module, which can automatically adjust the charging current according to the current output capability of the input voltage source

l Can be powered by voltage sources with limited current output capability, such as solar panels

l Constant voltage charging voltage: 4.2V±1%

l Settable constant current charging current up to 400mA

l Settable minimum constant current charging current as low as 3mA

l Overcurrent protection function of charging current can prevent damage caused by short circuit of ISET pin or abnormal use of abnormally small resistor

l Can be used as a voltage source

l Internal soft-start circuit

l Trickle charging mode is adopted when the battery voltage is low to activate the deeply discharged battery and reduce power consumption

l Constant current/constant voltage/constant temperature charging mode is adopted, which can maximize the charging current and prevent the chip from overheating

l Automatically enters low-power sleep mode when the power supply voltage is cut off

l Status indication output

l Automatic recharging

l Battery temperature monitoring function compliant with JEITA standard

l Package type: 2mm*2mm DFN-6

l Lead-free product, RoHS compliant, halogen-free