Preset float charge voltage: 4.2V/4.35V/4.4V Charging current: 10mA~500mA adjustable, accuracy ±10% Charging cutoff current adjustable, accuracy ±15% Supports low cutoff current applications such as Bluetooth earphones Fewer components Three-stage charging: trickle/constant current/constant voltage No MOSFET, detection resistors, or isolation diodes required Intelligent thermal regulation of charging current 10V input overvoltage protection 28V input voltage, no input overvoltage protection circuit required Power and charging status indicators Automatic recharging Compliant with the latest IEC62368 standard TDFN-2x2-8L package

The SY8602 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 if the input voltage exceeds the overvoltage protection threshold, typically 10V. The ability to withstand input voltages up to 28V eliminates the need for an input overvoltage protection circuit in low-voltage chargers.
The SY8602 presets charging float voltages of 4.2V/4.35V/4.4V, 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.
The SY8602 integrates an internal reverse charge protection circuit, eliminating the need for an external isolation diode. It has a built-in thermal decay control function that intelligently adjusts the charging current to improve IC reliability.
The SY8602 provides PPR and CHG pins, using an open-drain NMOS drive structure, which 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 lower than the set charging cutoff current, CHG is disabled. When the input voltage (AC adapter or USB power) is removed, the SY8602 automatically enters a low-current state.
The SY8602 uses a TDFN-2x2-8L package and the recommended operating temperature range is -40°C~+85°C.