CN3763

CN3763 is a PWM buck-mode three-cell lithium battery charge management IC that independently manages the charging of three-cell lithium batteries. It features a compact package, minimal external components, and ease of use. CN3763 supports trickle, constant current, and constant voltage charging modes, making it ideal for lithium battery charge management. In constant voltage mode, CN3763 regulates the battery voltage to 12.6V, which can be adjusted upward via an external resistor; in constant current mode, the charge current is set by an external resistor. For deeply discharged lithium batteries, when the battery voltage falls below 66.5% (typical) of the constant voltage charge voltage, CN3763 applies trickle charge at 17.5% of the set constant current charge value. During the constant voltage charging phase, the charge current gradually decreases; when it drops to 16% of the constant current charge value, charging terminates. In the charge termination state, if the battery voltage falls to 95.5% of the constant voltage charge voltage, a new charge cycle starts automatically. When the input power is removed or the input voltage drops below the battery voltage, CN3763 automatically enters sleep mode. Additional features include input undervoltage lockout, battery terminal overvoltage protection, and charge status indication. CN3763 is available in a 10-pin SSOP package.

Applications

• Handheld devices
• Backup battery applications
• Portable industrial and medical instruments
• Power tools
• Standalone battery chargers

Key features

• Wide input voltage range: 6.6V to 30V
• Complete charge management for 3-cell Li-ion batteries
• Charge current up to 4A
• PWM switching frequency: 300KHz
• Constant voltage charge level adjustable upward via resistor
• Constant voltage charge accuracy: ±1%
• Constant current charge set by external resistor
• Trickle charging for deeply discharged batteries
• Auto-recharge function
• Charge status and end-of-charge indication
• Soft-start function
• Battery terminal overvoltage protection
• Operating temperature range: -40°C to +85°C
• 10-pin SSOP package
• Lead-free, RoHS compliant, halogen-free