DESCRIPTION
HM4209 is a charging status display with dual lights, At the same time, a single battery with reverse battery protection and lithium battery protection functions Lithium battery charge management chip. The charging process includes trickle charging Three processes of electricity, constant current charging, and constant voltage charging, the charging process Red light is displayed, green light is displayed when fully charged. Lithium battery protection function package Including overcharge protection, overdischarge protection, overcurrent protection, short Circuit protection, lithium battery reverse connection protection function, with 0V battery The activation function does not require external MOS. Package form: ESOP8, in line with "ROHS" standard.

Main electrical parameters of charging function
● Input voltage: 5.0V ± 0.5V
● Charging current: 50 to 1000mA adjustable
● Charging saturation voltage: 4.20V ± 1%

Main electrical parameters of lithium battery protection function
● Overcharge protection voltage: 4.275V ± 50mV
● Overcharge recovery voltage: 4.075 V ± 25mV
● Over-discharge protection voltage: 2.50V 土 50mV
● Over-discharge recovery voltage: 2.90V ± 75mV
● Overcurrent protection current: 2.5A

Main features of charging function
● With battery reverse connection protection function;
● Adjustable charging current from 50 to 1000mA;
● No need for isolation diodes to achieve anti-backflow function;
● Constant current/constant voltage operation,

The thermal regulation function that maximizes the charging rate under dangerous conditions;
● 4.2V preset charging voltage with an accuracy of ±1%;
● Dual output of charging status and fault status display;
● 2.9V trickle charge;
● Soft start limits the inrush current;