Highly Integrated Lithium Battery Protection
NCP802
Highly Integrated Lithium
Battery Protection Circuit
for One Cell Battery Packs
The NCP802 resides in a lithium ...
Description
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...
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