STMicroelectronics L9988
The L9988 is a multicell battery stack monitor that measures up to four series-connected battery cells with a total measurement error of less than 2 mV. The IC has one battery stack current measurement channel, which can support synchronous current and voltage measurement, performing Coulomb counting for SoC estimation. The L9988 includes both timed and PWM-based odd-even passive balancing for each cell.| Part No. | L9988 |
|---|---|
| Datasheet | L9988 Download |
| Manufacturer |  STMicroelectronics |
| Description | Automotive 12V Li-Ion battery management system |
| Buy | Stock & Price |
FEATURES
● AEC-Q100 grade 1 qualified● Full ISO26262 compliant, ASIL-D systems ready
● [4 V÷28 V] Power supply operating range
● Voltage measurement: – 15-bit sigma delta ADC with programmable filter time with cutoff down to 30 Hz – Measures 4 single cell voltage, with over/under voltage detection and balance timeout protection – Measures stack voltage, with over/under voltage detection and plausibility check vs. sum of cells – Full 0÷5 V measurement range, with total error < ±2 mV in the [1.8 V÷4.5 V] range with -40°C ≤ TJ ≤ +105°C
● Current measurement: – 20-bit current sense ADC for battery current measurement (range ± 1500 A), with overcurrent protection – Total error < 0.23% for ±200 A, considering 100 µΩ RSHUNT typical value (no spread contribution) – 20-bit Coulomb counting ADC for SoC estimation – Total error < 3.9% for ±100 mA in STANDBY MODE, considering 100 µΩ RSHUNT typical value (no spread contribution) – Continuously short-circuit detection
● Passive cell balancing: max...
