Li-ion Battery Protection ICThe new role's manifestations in various aspects:

In addition to the aforementioned functionalities of the lithium battery protection IC, there are now some new features worth noting. Take, for example, the "Ricoh" lithium battery protection IC from Dongrui Electronics---the R5426.

(1) Overcurrent protection during charging

When an overcurrent occurs during charging due to a damaged charger, the overcurrent detection during charging is triggered, at which point Cout will be set to High.Low, Power MOS by ONOFF, the protective action achieved.

V-(Vdet4 overcurrent detection voltage) = I(charge current) * Rds(on) * 2

(2) Reduced Testing Time

Assuming it takes 1 second to test a single PCB, 1 million PCBs would require 1 million seconds, which is extremely time-consuming and inefficient. Therefore, we can utilize the following methods to shorten the testing time.

When we open the DS pin of the R5426, the delay time is as specified in the datasheet.

When we connect the DS pin of R5426 to VDD, the delay time is only 1/90 at this point.

(When) connecting the DS pin of R5426 to Vim (with a minimum of 1.2V and a maximum of VDD - 1.1V), the delay time can be overlooked.

(Latch: Locks in place during overcharge)

Typically, after a certain delay during overcharge protection, the Power MOSFET (Cout) is turned off to achieve the protective purpose. As the lithium battery voltage continues to drop to the release point (Overcharge...),