CXLB73248 is a PFM boost five-cell lithium battery charging control integrated circuit operating from 4.5V to 6.5v. CXLB73248 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, CXLB73248 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 the 21V (typical value) set internally for the first time, CXLB73248 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 21V, the charging process ends and the off-chip N-channel MOSFETs remain off condition. When the BAT pin voltage drops to the recharge threshold, CXLB73248 enters the charging state again. The maximum operating frequency of CXLB73248 can reach 1MHz. When the battery voltage is lower than the input voltage or the battery is short-circuited, the CXLB73248 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, and status indicator output. CXLB73248 uses 8-pin SOP8 package.
-
[ CXLB73248 ]"
