- 54 -
3. TECHNICAL BRIEF
Constant Voltage Charging
PM6658 IC support of main battery constant voltage charging is very similar to its constant current
mode: the battery MOSFET is closed and the pass transistor is closed-loop controlled.
But in this case, the closed-loop control regulates the voltage at VBAT (pin E1) to match the
programmed value (VMAXSEL). This ensures the most accurate final battery voltage°™Li-ion battery
manufacturers recommend a voltage accuracy of 1% or better at the end of charge. The battery
voltage is constant (or nearly so) while the charging current decreases exponentially for the remaining
charge process
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes