Overview: CN3722 (Note 1) is a PWM buck mode charging management integrated circuit that can be powered by solar cells and has a maximum power point tracking function for solar cells. CN3722 is ideal for charging management of single-cell or multi-cell lithium batteries or lithium iron phosphate batteries, and has advantages such as small package size, few external components, and ease of use. CN3722 has constant current and constant voltage charging modes, making it ideal for charging lithium batteries or lithium iron phosphate batteries. In constant voltage charging mode, the constant voltage charging voltage is set by an external resistor divider network; in constant current charging mode, the charging current is set by an external resistor. For deeply discharged batteries, when the battery voltage is below 66.7% of the set constant voltage charging voltage, CN3722 performs trickle charging with 15% of the set constant current charging current. In the constant voltage charging stage, the charging current gradually decreases, and when the charging current decreases to 9.5% of the set constant current charging current, the charging ends. When the input power is off or the input voltage is lower than the battery voltage, CN3722 automatically enters a low-power sleep mode. Other functions include input undervoltage lockout, battery temperature monitoring, battery overvoltage protection, and charging status indication. CN3722 is available in a 16-pin TSSOP package.

Product Parameters

Main Functions: 5A Multi-Type Battery Charging Management Integrated Circuit

Operating Mode: Switching

Battery Type: Lithium battery, Lithium iron phosphate battery

Number of Batteries: Multiple

Output Voltage Range: 0V-27V

Input Voltage Range: 7.5V-28V

Maximum Charging Current: 5A

Operating Current: 1.7mA

Solar Power Supply: Yes

Thermal Modulation: No

Packaging Form: TSSOP16

Switching Frequency: 300kHz

Built-in Power Tube: No

Applications ：

l Charging with solar cells

l Laptop computers

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 Maximum power point tracking of solar cells

l Complete charging management for single-cell or multi-cell lithium batteries or lithium iron phosphate batteries

l Constant voltage charging voltage is set by an external resistor divider network

l Charging current up to 5A

l PWM switching frequency: 300KHz

l Constant current charging current is set by an external resistor

l Trickle charging for deeply discharged batteries

l Battery temperature monitoring function

l Charging status and charging completion status indication

l Soft start function

l Overvoltage protection at the battery terminal

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

l 16-pin TSSOP package

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