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3. Technical Brief
A. Trickle charging
When the VBAT is below a certain value, 3.2V, a current generator take care of internal trickle
charge signal is active. The charging current is set to 50mA.
Parameter
Trickle current
B. Normal charging
When the VBAT voltage is within limits or the internal regulators are turned on, the current source for
trickle charging is turned off and all parts of the charging block are active.
The charging method is 'CCCV' (Constant Current Constant Voltage) This charging method is used for
Lithium chemistry battery packs. The CCCV method regulates the charge current and the VBAT
voltage. This charging method prevents the battery voltage to go above the charge set in the CCCV
algorithm. Figure 3-4-19 shows the charging voltage(a) and charging current change(b).
(a) Charging voltage
(b) Charging current
Min
Typ
30
50
Table 3-4-8. Trickle charging spec
- 72 -
Max
60
Figure 3-4-19. CCCV charging method
Unit
mA
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