LGS4084HB5-4.35

LGS4084 is a linear lithium battery charge management IC integrating battery charging and charge status indication, providing a complete power solution for single-cell lithium batteries. The IC supports four charging stages: short-circuit current, trickle current, constant current, and constant voltage. Short-circuit charging enables charging of 0V batteries; trickle charging pre-charges deeply discharged batteries; constant current charging rapidly charges the battery; constant voltage charging ensures charging safety. The default charge termination voltage is 4.2V, and the charge current is configurable via an external resistor, with a maximum charge current of 500mA. When the charge current drops to 1/10 of the set value, the IC automatically terminates charging and continuously monitors the battery voltage, automatically reinitiating charging when the voltage falls below a specified threshold. When the input power is removed, the IC automatically enters low-power mode, with a battery leakage current below 1uA.

Applications

• Mobile multimedia devices
• Portable devices powered by Li-ion battery with USB input

Key features

• Built-in linear charger with high input voltage and adjustable charge current
• Input voltage range: 4V~24V (surge voltage up to 28V)
• Maximum constant current charging up to 500mA; supports real-time charge current configuration via external resistor
• Compatible with 5V USB power and AC adapters; hot-plug protection
• Supports 4.2V/4.35V Li-ion battery types
• Intelligent charge current adjustment based on battery temperature and input voltage
• Battery reverse-current blocking; battery-side leakage current <1uA
• Comprehensive charge status indication and fault indication (e.g., battery not connected)
• Protection features: UVLO, over-temperature protection, OVP, thermal regulation of charge current, soft-start for constant current charging
• Junction temperature range: -40℃ to +85℃
• ±2000V HBM ESD protection on all pins