CXLB73253 is a PFM boost type dual lithium battery charging control integrated circuit operating from 2.75V to 6.5v. CXLB73253 adopts constant current and quasi-constant voltage mode (CVTM) to charge and manage the battery. The internal integration includes reference voltage source, inductor current detection unit, battery voltage detection 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, CXLB73253 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) set internally for the first time, CXLB73253 enters the quasi-constant voltage charging mode and charges the battery with a small current. In the quasi-constant voltage mode, when the BAT pin voltage reaches 8.4V, the charging process ends and the off-chip N-channel MOSFETs remain off condition. When the BAT pin voltage drops to the recharge threshold, CXLB73253 enters the charging state again. The maximum operating frequency of CXLB73253 can reach 1MHz. When the battery voltage is lower than the input voltage or the battery is short-circuited, the CXLB73253 continues to charge the battery with a small current under the combined action of off-chip N-channel MOSFETs and P-channel MOSFETs, which plays a protective role on the battery. Other functions include Chip Enable input, die over-temperature protection, current detection resistance short circuit protection, status indication output terminal, etc. CXLB73253 is packaged in 8-pin SOP8 package.
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[ CXLB73253 ]"
