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3. TECHNICAL BRIEF
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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.12.2 Charging
Charger Description
The RT8966 integrates a single-cell Li-ion battery charger IC with pre-charge mode, a fast charge mode
(constant current mode) or constant voltage mode. The charge current is programmable via the I2C interface
as shown in the control register address tables, CHG_Ctrl1 and CHG_Ctrl2. The CV mode voltage is fixed at
4.2V. The pre-charge threshold is fixed at 2.6V. If the battery voltage is below the pre-charge threshold, the
RT8966 charges the battery with a trickle current until the battery voltage rises above the pre-charge
threshold. The RT8966 is capable of being powered up from AC adapter and USB (Universal Serial Bus) port
inputs. Moreover, the RT8966 includes a linear regulator (LDO 4.9V, 50mA) for supplying low power external
circuitry.
Figure 3.12.2. RT8966GQW FUNCTION BLOCK DIAGRAM