EDN's 19th Annual Innovation Awards Finalists
-- EDN, February 2, 2009
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&& PREVIOUS FINALIST | MAIN | NEXT FINALIST >> Category: Battery ICs Finalist: MC3467x Li-ion-battery-charger ICs (Freescale Semiconductor)  Freescale’s MC3467x family of lithium ion battery charger ICs provides extremely accurate charging current and output voltages to optimize battery life and performance for portable consumer electronics products. High charging accuracy is vital for prolonged battery life. Test data shows that if a battery is charged to 4.2V, it can be charged and discharged for 300 cycles before the capacity drops to 80 percent of the original capacity. If the battery is charged to 4.1V, it can last for 800 charging cycles or more, but with a slightly lower initial capacity. The cycle life drops quickly as the voltage rises above 4.2V. Thus, with a highly accurate charging voltage, batteries can be charged to an optimal level (not too far above or below 4.2V), resulting in longer battery life without sacrificing the initial capacity.The MC34671 and MC34673 have an output voltage accuracy of +/-0.7 percent over temperate and a charging current accuracy of +/ 5 percent over temperature; the MC34674 has an output voltage accuracy of +/-0.4 percent and a charging current accuracy of +/ 8 percent. The MC3467x ICs can deliver up to 1.2A of charge current to single cell Li Ion or Li Polymer batteries. The battery charger input voltage can come from an AC adapter or a USB port power source. The high input voltage capability (up to 28V) eliminates the need for an external input over-voltage protection circuit, which reduces system cost and board space. |
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