Maxim is sampling the MAX14920/MAX14921 high-accuracy, 12/16-channel cell measurement analog front ends (AFEs) that claim to lower battery management electronics costs by up to 35%. These devices boost the accuracy of cell voltage readings through the use of high-accuracy common-mode level shifting and an integrated high-precision amplifier that simplifies ADC data conversion.
Higher accuracy improves state-of-charge determination and cell balancing that in turn lengthen the life of rechargeable Lithium-ion (Li+) battery packs and maximise available energy, especially important for modern battery chemistries that exhibit flat voltage discharge curves, such as those with LiFePO4 cathodes.
The new ICs enable cell voltage measurements of ±0,5 mV. Ideal for 48 V to 65 V pack voltages required in uninterruptible power supply (UPS) systems, smart grid energy storage packs and telecom power backup-battery packs, the MAX14921 eliminates up to two 6-channel AFEs required for 13S-16S channel battery packs.
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