FM5001H is a power management IC that integrates lithium battery charging management, lithium battery protection, DC-DC boost current limiting, and 3-speed adjustable air volume fan drive functions; Specially designed for portable fans powered by lithium batteries.
    FM5001H integrates charging methods including trickle charging, constant current charging, and constant voltage charging throughout the entire process, with charging indicators and full charge indicator lights; Supports fan drive function, built-in 3-speed adjustable air volume control, and supports discharge LED indication; When the battery voltage is less than 2.9V, the FM5001H system enters an undervoltage state, and the entire system current is 30uA; Built in constant current charging current of 600mA.
    FM5001H has multiple protection designs, including load overcurrent protection, anti backflow protection during charging, short circuit anti lock, soft start protection, lithium battery over discharge protection, over temperature and under voltage protection, etc.
    FM5001H integrates a fan control and drive circuit with three adjustable air volumes; When there is no charger connected, press the SWCH1 button to control the change in air volume. Press the button once to change the air volume by one level, and the air volume will change from weak to strong. When the VOUT pin has a boost output, the fan light is on. The output voltage VFAN of the VOUT terminal is 5.4V for the first level, 7.3V for the second level, and 9.2V for the third level (with a voltage deviation of ± 0.3V between chips in each level). When a charger is connected, short press SWCH1, the fan will only work in gear 1, the fan light will turn on, and the charging light will turn on.

0.6A lithium battery charging
Support 9V motor drive control, adjustable 3-speed air volume
Support single button switch
Charging voltage accuracy: ± 1.0%; Boosting voltage accuracy: ± 4.0%
Overcurrent Protection (OCP), Overvoltage Protection (OVP), Short Circuit Protection (SCP), Over Temperature Protection (OTP)
ESD 2KV, high reliability
Extremely low BOM cost
Standby current 30uA
Supports 4.2V and 4.35V batteries
FM5001H provides ESOP8 packaging