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NE57607GDH Datasheet(PDF) 6 Page - NXP Semiconductors |
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NE57607GDH Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 10 page Philips Semiconductors Product data NE57607 Two-cell Lithium-ion battery protection with overcurrent, over- and under-voltage protection 2001 Oct 03 6 Charging Lithium cells The lithium cells must be charged with a dedicated charging IC such as the NE57600. These dedicated charging ICs perform a current-limited, constant-voltage charge, as shown in Figure 4. The charger IC begins charging with a current that is typically the rating of the cell (1C) or the milliampere rating of the cell. As the cell approaches its full-charge voltage rating (VOV), the current entering the cell decreases, and the charger IC provides a constant voltage. When the charge current falls below a preset amount, 50 mA for example, the charge is discontinued. If charging is begun below the overdischarged voltage rating of the cell, it is important to slowly raise the cell voltage up to this overdischarged voltage level. This is done by a reconditioning charge. A small amount of current is provided to the cell (50 mA for example), and the cell voltage is allowed a period of time to rise to the overdischarged voltage. If the cell voltage recovers, then a normal charging sequence can begin. If the cell does not reach the overdischarged voltage level, then the cell is too damaged to charge and the charge is discontinued. To take advantage of the larger energy density of lithium cells it is important to allow enough time to completely charge the cell. When the charger switches from constant current to constant voltage charge (Point B, Figure 4) the cell only contains about 80 percent of its full capacity. When the cell is 100 mV less than its full rated charge voltage the capacity contained within the cell is 95 percent. Hence, allowing the cell to slowly complete its charge takes advantage of the larger capacity of the lithium cells. SL01554 1.0 0.5 1.0 2.0 3.0 4.0 1.0 2.0 Point B Vov TIME (HOURS) TIME (HOURS) CONSTANT VOLTAGE CONSTANT CURRENT Figure 4. Lithium cell charging curves. FUNCTIONAL DIAGRAM NE57607 2 4 1 5 8 3 CS CF DF OC Ref OV Ref UV Ref 6 OV Ref UV Ref 7 SL01566 VC1 VC2 OV DEADTIME CONTROL UV DEADTIME CONTROL VCC VCC GND CDLY CHARGER DETECTOR Figure 5. Functional diagram. |
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