RT9709 pdf,datasheet(Integrated Over Voltage Protection Circuit)
The RT9709 is an integrated circuit (IC) optimized to protect
low voltage system from abnormal high voltage input up to
28V. The IC monitors the input voltage, battery voltage
and the charging current to make sure all three parameters
are operated in normal range. It also monitors its own
temperature and turns the MOSFET off when the chip
temperature exceeds 140°C.
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