CXLB73249 is a PFM boost type two lithium battery charging management integrated circuit. CXLB73249 adopts trickle, constant current and quasi-constant voltage mode (CVTM) to charge and manage two lithium batteries, with internal integration of reference voltage source and inductor current detection unit, control circuit and off-chip field effect transistor drive circuit, etc., with external components
Few, simple circuit and other advantages. When the input power supply is turned on, CXLB73249 enters the charging state, and the off-chip N-channel MOSFETs are controlled to conduct, and the inductor current rises. When it rises to the upper limit of the external current detection resistor setting, off-chip N-channel MOSFETs, the inductor current drops, and the energy in the inductor is transferred to the battery. When the inductor current drops to the lower limit of the external current detection resistor setting, the off-chip N-channel MOSFETs turn on again, thus cycling. When the BAT pin voltage reaches 8.4V (typical value) for the first time, CXLB73249 enters the quasi-constant voltage charging mode with a small current
Charge the battery. Only when the BAT pin voltage reaches 8.4v for the second time, the charging process ends and the off-chip N-channel MOSFETs remain off condition. When the BAT pin voltage drops to the recharge threshold, CXLB73249 enters the charging state again. The maximum operating frequency of CXLB73249 can reach 1MHz, and the operating temperature ranges from-40℃ to + 85℃. Other functions include input power adaptive function, battery temperature monitoring function conforming to JEITA standard, battery overvoltage protection, chip overtemperature protection, two drain open circuit status indicating output terminals, etc.
CXLB73249 adopts heat dissipation enhanced 8-pin small shape package (eSOP8).
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[ CXLB73249 ]"
