Overview: CN3166 is a single-cell lithium battery charge management chip that can be powered by solar energy. The device includes power transistors internally, eliminating the need for external current sensing resistors and blocking diodes. The internal adaptive charging current module automatically adjusts the charging current based on the input power's current output capability. Users do not need to consider worst-case scenarios, maximizing the utilization of the input power's current output capability. This makes it ideal for lithium battery charging applications powered by sources with limited current output, such as solar panels. CN3166 requires very few external components, making it suitable for portable applications. The thermal modulation circuit controls the chip temperature within a safe range when the device's power consumption is high or the ambient temperature is high. The internal fixed constant voltage charging voltage is 4.2V, which can also be adjusted upward via an external resistor. The charging current is set via an external resistor. When the input voltage is cut off, CN3166 automatically enters a low-power sleep mode, with a battery current of less than 3 microamps. Other functions include input undervoltage latch, automatic recharging, JEITA-compliant battery temperature monitoring, overcurrent protection during charging, and charging status/charging completion status indication. CN3166 is available in a 2mm x 3mm 8-pin DFN package.

Product Parameters

Main Functions: JEITA standard compliant lithium battery charging management chip with solar power

Operating Mode: Linear

Battery Type: Lithium-ion battery

Number of Batteries: 1

Input Voltage: 4.4V-6V

Output Voltage Range: 0V-4.2V

Maximum Charging Current: 1A

Maximum Output Current: 1A

Operating Current: 500uA

Solar Power: Yes

Thermal Modulation: Yes

Package Type: DFN8 (2mm*3mm)

Chip Enable: No

Built-in Power MOSFET: Yes

Applications:

Wireless earphones

Wearable devices, smart bracelets

Beauty and cosmetic instruments

Medical endoscopes

Electric toothbrushes

Solar chargers

Portable devices

Features:

Integrated charging current adaptive module, automatically adjusts charging current based on input voltage source current output capability

Suitable for lithium battery charging applications powered by voltage sources with limited current output capability, such as solar panels

Input voltage range: 4.4V to 6V

No external current limiting diodes and current sensing resistors required

Constant voltage charging voltage 4.2V, can also be adjusted upwards via an external resistor

Constant voltage charging voltage can be set to 4.35V or 4.4V via an external resistor, suitable for ternary lithium battery charging

Settable constant current charging current up to 1A

Overcurrent protection function prevents damage from ISET pin short circuit or misuse of abnormally small resistors

Can be used as a voltage source

Internal soft-start circuit

Trickle charging mode is used at lower battery voltages to activate deeply discharged batteries and reduce power consumption

Constant current/constant voltage/constant temperature charging mode maximizes charging current while preventing chip overheating

Automatically enters low-power sleep mode when power voltage drops

Dual indicator output for charging status and charging completion status

Automatic recharging

JEITA standard compliant battery temperature monitoring function

Package Type: 2mm x 3mm DFN-8

Lead-free product, RoHS compliant, halogen-free