CXLB73182 is a 2.7V to 6.5V PFM boost type four battery charge control integrated circuit. The CXLB73182 adopts constant current and quasi-constant voltage mode (Quasi-CVTM)) to manage the battery charging. It integrates a reference voltage source, an inductor current detection unit, a battery voltage detection circuit and an off-chip field effect transistor drive circuit, etc., with fewer external components, The circuit is simple and other advantages.
When the input power is turned on, the CXLB73182 enters the charging state, controlling the off-chip N-channel MOSFET to be turned on, and the inductor current rises. When it rises to the upper limit set by the external current detection resistor, the off-chip N-channel MOSFET is turned off, the inductor current drops, and the inductor The energy in is transferred to the battery. When the inductor current drops to the lower limit set by the external current sense resistor, the off-chip N-channel MOSFET turns on again, and so on. When the BAT pin voltage first reaches the internal setting of 16.8V (typical), the CXLB73182 enters quasi-charge mode to charge the battery with a small current. Only when the voltage at the BAT pin reaches 16.8V for the second time does the charging process end and the off-chip N-channel MOSFET remains off. When the BAT pin voltage drops to the recharge threshold, the CXLB73182 again enters the charge state. The maximum operating frequency of the CXLB73182 can reach 1MHz, and the operating temperature range is from -40 ℃ to +85 ℃.
When the battery voltage is lower than the input voltage or the battery is short-circuited, the CXLB73182 continues to charge the battery with a smaller current under the joint action of the off-chip N-channel MOSFET and P-channel MOSFET to protect the battery. Other functions include chip enable input, status indication output, etc.
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[ CXLB73182 ]"
