NCP802

NCP802 Highly Integrated Lithium Battery Protection Circuit for One Cell Battery Packs The NCP802 resides in a lithium battery pack where the battery cell continuously powers it. This circuit senses cell voltage, charge current, and discharge current, and correspondingly controls the state of two, N−channel MOSFET switches. These switches reside in series with the negative terminal of the cell and the negative terminal of the battery pack. During a fault condition, the NCP802 open circuits the pack by turning off one of these MOSFET switches, which disconnects the current path. Internal delay circuitry minimizes external component count. Features Highly Accurate Overvoltage Detector "25 mV at Room Temperature "30 mV from −5 to 55°C Fault Detection Thresholds Overvoltage Threshold: SN1/SAN1 = 4.35 V, SAN5 = 4.275 V, SAN6 = 4.28 V Undervoltage Threshold: SN1/SAN1 = 2.4 V, SAN5/6 = 2.3 V Discharge Current Threshold: SN1/SAN1/SAN6 = 0.2 V, SAN5 = 0.1 V Charge Current Threshold: 0.1 V Internal Output Delays Overvoltage Output Delay: SN1/SAN1/SAN6 = 250 ms, SAN5 = 1 ms Undervoltage Output Delay: 20 ms Discharge Current Output Delay: SN1/SAN1/SAN6 = 12 ms, SAN5 = 6 ms Charge Current Output Delay: SN1/SAN1/SAN6 = 16 ms, SAN5 = 8 ms Absolute Maximum Rating of 28 V for the Charger Input Low Quiescent Current Normal Operating Current: 3.0 mA Standby Current when Cells are Discharged: 0.1 mA Zero Volt Charging Available in a Low Profile Surface Mount Package Pb−Free Pack...