Battery Charger Interface - LG -A100 Service Manual

3. TECHNICAL BRIEF

3.9 Battery Charger Interface

Figure 3.9.1. RT8966 Block Diagram
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.
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