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7.1.11 BATTERY SUPPLY (SEE Fig. 27)
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A switch mode boost converter is used to provide a 3.8V supply from the battery. This supply is sensed
by the BBIC through pin 26 (TP14) so that the switching rate can be controlled by a FET (T3) driven
from pin 24 (TP13). A resistor on theSource of the FET provides a current sense at pin 25 (TP12).
T3 switches the current through L1. When T3 switches off the back emf conducts through D16 and
charges the reservoir cap C4.
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