Fs7022 scheme series fs4059a dual two lithium battery series charging IC and protection IC

In daily design , Application , Single lithium battery , Or two 、 three links 、 Four lithium batteries in parallel are the most common way , Because in IC It is easy or diversified in type selection and design . When two sections / When two lithium batteries are used in series , You'll need another double section / Two lithium batteries for protection IC And charging IC. Bijie / Two lithium batteries are connected in series to protect the chip and IC circuit : 

FS7022 It consists of two strings 3.8V/4.35V That is to say 8.7V Protection of high voltage lithium batteries in series IC Chip or protection circuit
FS7022B It consists of two strings 3.7V/4.2V That is to say 8.4V Protection of high voltage lithium batteries in series IC Chip or protection circuit .

 

Two lithium batteries are connected in series with a charging chip FS7022B Matching circuit :USB： 5V Input , Give me two sections 8.4v Lithium battery boost charging chip in series FS4059A And  FS7022B Two lithium battery protection chips connected in series , The combined circuit is as follows : It should be noted that this booster IC Only suitable for small current charging and discharging scheme , because BAT Only when the foot is under pressure 8.8V.

Please note that ：FS4059A If the battery supplies power to the motor or high-power load, it will easily lead to chip breakdown and damage due to the high counterattack and backflow voltage .  Power diode and electrolytic capacitor filter must be added to the load power supply .

Two lithium batteries are connected in series with a charging chip FS7022B Matching circuit :USB： 5V Input , Give me two sections 8.4v Lithium battery boost charging chip in series FS4062A And  FS7022B Two lithium battery protection chips connected in series , This chip supports 8.4V2A Charging current , Because there is no discharge BAT Therefore, this chip is suitable for various high current two series lithium battery charging schemes .

 

Input step-down type DC : 9V,12V Input , Charge two lithium batteries in series -FS4058B
And PL7022B Two lithium battery protection chips connected in series , The combined circuit is as follows :