SLUSFR7 August 2025 BQ24810
PRODUCTION DATA
請參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。
With sufficient charge current, the inductor current does not cross 0, which is defined as CCM. The controller compares SRP-SRN (CC charging) or SRN (CV charging) to a reference value as set in ChargeCurrent() REG0x14 and ChargeVoltage() REG0x15. This error is integrated in the error amplifier and the error amplifier output (EAO) is compared to a ramp voltage. As long as EAO voltage is above the ramp voltage, the high-side MOSFET (HSFET) stays on. When the ramp voltage exceeds EAO voltage, HSFET turns off and low-side MOSFET (LSFET) turns on. At the end of the cycle, ramp gets reset and LSFET turns off, ready for the next cycle. There is always break-before-make logic during transition to prevent cross-conduction and shoot-through. During the dead time when both MOSFETs are off, the body-diode of the low-side power MOSFET conducts the inductor current.
During CCM, the inductor current always flows and creates a fixed two-pole system. Having the LSFET turn-on keeps the power dissipation low and allows safe charging at high currents.