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MIC79110-4.2BML Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC79110-4.2BML Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 10 page July 2004 9 M9999-072004 MIC79110 Micrel capacity. An increase in the charge current during stage 1 does not shorten the total charge time. It will only shorten the time for stage 1 to complete and lengthen the time in stage 2. The lithium-ion loses charge due to aging whether it is used or not. Do not store the batteries at full charge and high heat because it will accelerate the aging process. Try and store with 40% charge and in a cool environment. Lithium-Ion Safety Precautions Every lithium ion battery pack should have a safety board which monitors the charge and discharge of the pack and prevents dangerous occurrences. The specifications of these safety boards are dictated by the cell manufacturer and may include the following: • Reverse polarity protection • Charge temperature must not be charged when temperature is lower than 0°C or above 45°C. 0 Start Charging Lithium-Ion Battery Shutdown Pin Deoc Flag is Low Continue Charge Charging Monitor Ibat Deoc Flag is High Stop Charge Battery Charging Stop Charge End of Charge Ibat Stop Charge Current Limit Ieoc<Ibat<Irset Standby Mode Do not charge <Ieoc Battery Voltage Die Temperature Irset <Ieoc 1 >4.3V >125C <125C <4.3V • Charge current must not be too high, typically below 0.7C • Discharge current protection to prevent damage due to short circuits. • Protection circuitry for over voltage applied to the battery terminals. • Overcharge protection circuitry to stop charge when the voltage per cell rises above 4.3V. • Over discharge protection circuitry to stop dis- charge when the battery voltage falls below 2.3V (varies with manufacturer). • Thermal shutdown protection for the battery if the ambient temperature is above 100°C. |
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