Overview: CN3706 is a PWM buck mode four-cell lithium battery charge management integrated circuit that automatically manages the charging of four lithium batteries independently. It features a small package size, few external components, and ease of use. CN3706 features constant current and constant voltage charging modes, making it ideal for lithium battery charging. In constant voltage charging mode, CN3706 regulates the battery voltage to 16.6V with an accuracy of ±1%; in constant current charging mode, the charging current is set by an external resistor. For deeply discharged lithium batteries, when the battery voltage is below 11.2V, CN3706 performs trickle charging at 15% of the set constant current. During the constant voltage charging stage, the charging current gradually decreases, and when the charging current drops to the value set by the external resistor, the charging ends. In the charging completion state, if the battery voltage drops to 16V, a new charging cycle automatically begins. When the input power is cut off or the input voltage is lower than the battery voltage, CN3706 automatically enters sleep mode. Other functions include input undervoltage latch, battery temperature monitoring, battery overvoltage protection, and charging status indication. CN3706 is packaged in a 16-pin TSSOP package.

Product Parameters

Main Functions: 5A four-cell lithium battery charging management integrated circuit

Operating Mode: Switching

Battery Type: Lithium battery

Number of Batteries: 4

Output Voltage Range: 0V-16.8V

Input Voltage Range: 7.5V-28V

Maximum Charging Current: 5A

Operating Current: 1.95mA

Solar Power Supply: No

Thermal Modulation: No

Package Type: TSSOP16

Switching Frequency: 300kHz

Built-in Power MOSFET: No

Applications ：

l Notebooks, Netbooks

l Model airplanes, cars, and boats, etc.

l Backup battery applications

l Portable industrial and medical instruments

l Power tools

l Independent battery chargers

Features ：

l Wide input voltage range: 7.5V to 28V

l Complete charging management for four lithium batteries

l Charging current up to 5A

l PWM switching frequency: 300KHz

l Constant voltage charging voltage accuracy: ±1%

l Constant current charging current set by external resistor

l Trickle charging for deeply discharged batteries

l Charging end current can be set by external resistor

l Battery temperature monitoring function

l Automatic recharging function

l Charging status and charging completion status indication

l Soft start function

l Battery overvoltage protection

l Operating temperature range: -40°C to +85°C

l Using 16-pin TSSOP package

l Lead-free, halogen-free, RoHS compliant