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DS2726 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS2726 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Li+ Protection Conditions Overvoltage, OV. If any cell voltage (VCELL) exceeds the overvoltage threshold, VOV, for a period longer than overvoltage delay, tOVD, the DS2726 shuts off the external charge FET. When VCELL falls below the charge-enable threshold VCE, the DS2726 turns the charge FET on. The discharge FET remains enabled during the overvoltage event. Care should be taken while discharging during an OV condition because the current drawn by the load is going through the body diode of the CC FET. Undervoltage, UV. If VCELL drops below the undervolt- age threshold, VUV, for a period longer than undervolt- age delay, tUVD, the DS2726 shuts off the charge and discharge FETs and enters Sleep Mode. The device remains in Sleep Mode until a charger is detected, at which point the DS2726 wakes up and enables the CC FET. The DC FET remains disabled until every cell is above the VUV_REL threshold. Care should be taken while charging during a UV event because the charge current is flowing through the body diode of the DC FET. Discharge Overcurrent, DOC. If VSNS is less than VRDOC for a period longer than tDOCD, the DS2726 shuts off the external discharge FET. The discharge current path is not reestablished until VPKP rises above VVIN - VTP. The DS2726 provides a test current of value ITST from the PKP pin to the VIN pin to detect the removal of the offending low-impedance load. ITST is not disabled if an undervoltage condition is reached. Short Circuit, SC. If VSNS is less than VRSC for a peri- od longer than short-circuit delay tSCD, the DS2726 shuts off the external discharge FET. The discharge current path is not reestablished until VPKP rises above VVIN - VTP. The DS2726 provides a test current of value ITST from the PKP pin to the VIN pin to detect the removal of the short. ITST is disabled if an undervoltage condition is reached. Summary. All the protection conditions described are logic ORed to affect the CC and DC outputs: DC = (Undervoltage) or (Discharge Overcurrent) or (Short Circuit) CC = (Overvoltage) or (Undervoltage and Charger Detect) 5-Cell to 10-Cell Li+ Protector with Cell Balancing 10 ______________________________________________________________________________________ VOV VCE VUV VCELL VSNS VRSC VRDOC VVIN tOVD tOVD tUVD tUVD tOCD tSCD CHARGE DISCHARGE POWER MODE ACTIVE SLEEP CC DC VOHCC VOLCC VOLDC VOHDC VUV_REL Figure 3. Li+ Protection Circuitry Example Waveforms |
Similar Part No. - DS2726_09 |
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Similar Description - DS2726_09 |
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