CXLB73251 is a PFM boost type four lithium battery charging management integrated circuit. CXLB73251 uses trickle, constant current and quasi-constant voltage modes to charge and manage four lithium batteries. It is internally integrated with reference voltage source, inductor current detection unit, control circuit and off-chip field effect transistor drive circuit, etc, it has the advantages of few external components and simple circuit. When the input power supply is turned on, CXLB73251 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 16.8V (typical value) for the first time, the CXLB73251 enters the quasi-constant voltage charging mode, with a small current to rechargeable battery
Electricity. Only when the BAT pin voltage reaches 16.8V 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, CXLB73251 enters the charging state again. The maximum operating frequency of CXLB73251 can reach 1MHz, and the operating temperature ranges from-40℃ to + 85℃. Other functions include adaptive input power supply and battery temperature monitoring function conforming to JEITA standard.
Energy, battery over-voltage protection, chip over-temperature protection, two drain open-circuit status indicating output terminals, etc. CXLB73251 adopts heat dissipation enhanced 8-pin small shape package (eSOP8).
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[ CXLB73251 ]"
