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SY8601 Sample Application
General Description

SY8601 is single-lithium battery linear-charging IC with integrated high voltage input. The charging is disabled when input voltage is higher than the protection threshold of 6.5V input maxim voltage up to 28V, it can work well without over-voltage protect circuit.
The integrated reverse block protection circuit without external isolating diodes. NTC interface is provided for temperature detection of lithium battery. 
The trickle charge voltage is preset to be 4.2V/4.35V, and the charging current and charging cut-off current can be set via an external resistor for more applications. For battery voltage below 2.6V, the battery is pre-charged at 20% of the constant current. 
The PG and CH pin are open-drain which can drive LED. When the device is powered on and the working conditions are met, PPR is turned on. CHG is an end-of-charge indication, which is turned off when the charging current is lower than the preset charging cut-off current. 
SY8601 is available in a DFN-2x3-8L package, and recommended to work within the temperature range of -40°C~+85°C.

Features

Floating voltage is 4.2V/4.35V with ±1% accuracy

Charging current the range of 10mA~500mA, with ±10% accuracy

Charge cut-off current, with ±15% accuracy

Low cut-off current applications such as Bluetooth earbuds

Battery temperature detectionprotection

6.5V input over-voltage protection

28V input voltage, no need for input over-voltage protection circuit

Indication of power source and charging state

Automatic recharge

IEC62368

DFN-2x3-8L package

Typical Application Circuit Diagram
Applications

Wearable devices

Wireless Bluetooth earbuds

IOT equipment

Intelligent control equipment