12/16-channel AFEs double accuracy, reduce battery-management systems cost by up to 35 percent
The devices double 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 maximize available energy, especially important for modern battery chemistries that exhibit flat voltage discharge curves, such as those with LiFePO4 cathodes. The MAX14920/MAX14921 enable the industry’s highest accuracy cell voltage measurements (±0.5 mV, max). 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.
The devices increase individual cell accuracy and improve cell balancing. One chip supports battery management of up to 16 cell packs. The MAX14920/MAX14921 are suitable for use in both lower cost applications (using the ADC integrated in a microcontroller) and higher accuracy applications (utilizing an external ADC).
Availability and Pricing
The MAX14920 is available in a 64-pin (10 mm x 10 mm) TQFP package. Pricing starts at $5.04 (1000-up, FOB USA).
The MAX14921 is available in an 80-pin (12 mm x 12 mm) TQFP package. Pricing starts at $6.15 (1000-up, FOB USA).
Both devices operate across the -40°C to +85°C extended temperature range.
More information about the MAX14920/MAX14921 AFEs at www.maximintegrated.com/datasheet/index.mvp/id/7696
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