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3. TECHNICAL BRIEF
Constant Current Charging
The PM6658 IC supports constant current charging of the main battery by closing the battery MOSFET
(connecting the battery to VDD), and closed-loop controlling the pass transistor. If current limiting is
not implemented by the external supply, the closed-loop pass transistor control regulates the total
current (handset electronics (plus charging current) to match the programmed value (IMAXSEL). The
MSM device monitors the charging process as described earlier and continues the constant current
mode until the battery reaches its target voltage. Charging of Liion batteries require further charging
using constant voltage or pulse techniques.
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Only for training and service purposes