The MAX14921ECS+ is a high accuracy 16 cell measurement analogue front end (AFE) device in 80 pin TQFP package. This battery measurement analogue front end device accurately samples cell voltages and provides level shifting for primary/secondary battery packs. The device simultaneously samples all cell voltages by allowing accurate state of charge and source resistance determination. All cell voltages are level shifted to ground reference with unity gain which simplifies external ADC data conversion. The MAX14921 has low noise, low offset amplifier that buffers differential voltages of up to 5 that allows monitoring of all common lithium-ion (Li+) cell technologies. Passive cell balancing is supported by external FET drivers. Integrated diagnostics in device allow open wire detection and undervoltage/overvoltage alarms. The MAX14921 is controlled by a daisy chainable SPI interface. It is used in telecom battery backup systems, energy storage packs, e-transportation energy packs.
Supply voltage range from 6V to 65V
Operating temperature range from -40°C to 85°C
Industry's most accurate and flexible battery management system building block
High accuracy, ±0.5mV cell voltage error
Simultaneous cell voltage sampling, self calibration
Low power shutdown mode current of 1μA
VP supply current of 1μA (EN = low or LOPW = 1) and 65μA (EN = high)
6V minimum (3 cells) operation and cell voltage range from 0.5V to 4.5V
Cell voltage range from 0.5V to 4.5V
Integrated cell balancing FET drivers and integrated 5V LDO
(EN)
