Preset 4.2V/4.35V float charging voltage, accuracy ±1% Charging current 10mA~500mA can be set, accuracy ±10% Charging cutoff current can be set, accuracy ±15% Supports small cutoff current applications such as Bluetooth headsets Three-stage charging: trickle/constant current/constant voltage No MOSFET, detection resistors, or isolation diodes required Intelligent thermal regulation of charging current Battery temperature detection protection 6.5V input overvoltage protection 28V input voltage, no input overvoltage protection circuit required Power presence indication and charging status indication Automatic recharging Compliant with the latest IEC62368 standard DFN-2x3-8L package

The SY8601 is a single-cell lithium battery linear charging IC that integrates a high-voltage input and uses constant current/voltage. The IC can withstand input voltages up to 28V. To prevent excessive power consumption, the charging function will be disabled when the input voltage exceeds the overvoltage protection threshold of 6.5V. The ability to withstand input voltages up to 28V eliminates the need for an input overvoltage protection circuit in low-voltage chargers.
The SY8601 integrates an internal reverse charge protection circuit, eliminating the need for an external isolation diode. It has built-in thermal decay control, intelligently adjusting the charging current to improve IC reliability. The IC provides an NTC interface for lithium battery temperature detection and protection.
The SY8601 presets charging float voltages of 4.2V/4.35V and constant current charging current and charging cutoff current, which can be set via external resistors, allowing the IC to adapt to more application needs. When the battery voltage is below 2.6V, the IC will pre-charge the battery with 20% of the constant current charging current.
The SY8601 provides PPR and CHG pins, which are open-drain NMOS drive structures. These can drive an LED indicator and can also be combined with the EN pin for simple signal interaction with the MCU. When power is connected to VIN and the IC operating conditions are met, PPR is enabled. CHG indicates charging cutoff; when the charging current is below the set charging cutoff current, CHG is disabled.
The SY8601 uses a DFN-2x3-8L package and the recommended operating temperature range is -40°C~+85°C.