CN3058E

CN3058E is an integrated circuit for constant-current/constant-voltage charging management of single-cell lithium iron phosphate batteries. The device integrates a power transistor internally, eliminating the need for external current-sensing resistors and blocking diodes. Requiring minimal external components, the CN3058E is ideally suited for portable applications. A thermal regulation circuit keeps the die temperature within a safe range when the device dissipates significant power or operates in high ambient temperatures. The internal fixed constant-voltage charge voltage is 3.6V, which can also be adjusted via an external resistor. Charge current is set through an external resistor. When the input voltage (AC adapter or USB power) is removed, the CN3058E automatically enters a low-power sleep mode, during which the battery current consumption is less than 3μA. Additional features include input undervoltage lockout, automatic recharge, battery temperature monitoring, and charge status/charge complete status indication. The CN3058E is available in a thermally enhanced 8-pin Small Outline Package (SOP8).

Applications

• Mining lamps
• LiFePO₄ battery applications
• Various chargers

Key features

• Single-cell LiFePO₄ battery charge management
• Input voltage range: 3.8V to 6V
• Integrated power transistor
• No external blocking diode or current sense resistor required
• Constant voltage charge at 3.6V, adjustable via external resistor
• Low-current precharge mode at low battery voltage to activate deeply discharged batteries and reduce power consumption
• Programmable continuous constant current up to 1A
• CC/CV/CT charging mode to maximize charge current while preventing overheating
• Automatic low-power sleep mode on power supply dropout
• Dual status indicator outputs for charging and charge complete states
• C/10 charge termination detection
• Automatic recharge
• Battery temperature monitoring
• Thermally enhanced 8-pin SOP8 package
• Lead-free, RoHS compliant, halogen-free