Operation description

L6924U

12/37

Doc ID 14716 Rev 2

Figure 5.

Li-Ion charging profile

6.1

Linear mode

When operating in linear mode, the device works in a way similar to a linear regulator with a

constant current limit protection.

It charges the battery in three phases:

●

Pre-charging current ("pre-charge" phase).

●

Constant current ("fast-charge" phase).

●

Constant voltage ("voltage regulation" phase).

the pre-charge phase takes place. The battery is pre-charged with a low current, internally

set to 10 % of the fast charge current.

Finally, when the battery voltage is close to the regulated output voltage (4.2 V), the voltage

regulation phase takes place and the charging current is reduced. The charging process

charging timer expires.

Figure 6 shows the different phases.

0.000

0.050

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Charging time (sec)

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Ichg

Vbatt