L9967 - Automotive Battery Monitoring IC | STMicroelectronics
N.º da peça: L9967 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.65 | $76,50 |
| 100 | $6.8 | $680,00 |
| 500 | $6.12 | $3.060,00 |
| 1.000 | $5.44 | $5.440,00 |
L9967 Visão geral
A battery monitoring IC is a specialized analog front-end (AFE) that measures individual cell voltages, pack current, and temperature to estimate state-of-charge (SoC) and state-of-health (SoH). It sits between the battery pack and the host microcontroller, providing accurate telemetry for charge control, protection, and balancing algorithms. In the system hierarchy, the L9967 is a battery management IC (BMIC) within the broader power management IC (PMIC) category, essential for ensuring battery safety and longevity.
Key features of the L9967 include high-accuracy voltage measurement (typically ±10 mV), current sensing with integrated shunt amplifier, and passive cell balancing with internal MOSFETs. It supports up to 14 series cells and includes a 16-bit delta-sigma ADC for precise measurements. The device also features a programmable watchdog timer, overvoltage/undervoltage protection, and a robust SPI interface for daisy-chaining multiple devices.
Technically, the L9967 employs a precision bandgap reference and a delta-sigma ADC architecture to achieve high measurement accuracy across temperature. Its integrated balancing FETs allow passive balancing currents up to 300 mA, reducing external component count. The device is AEC-Q100 qualified, ensuring reliability in harsh automotive environments, and operates from -40°C to +125°C.
Typical applications include electric vehicle (EV) battery management, 48V mild-hybrid systems, and industrial energy storage. In an EV BMS, the L9967 monitors each cell group, communicates with the main controller via SPI, and triggers balancing during charging. Its high accuracy enables precise SoC estimation, extending battery life and ensuring safe operation.
When designing with the L9967, ensure proper decoupling on the supply pins and a solid ground plane for accurate measurements. The SPI interface should be isolated if the battery pack is referenced to a different ground. Also, consider thermal management for the balancing FETs, as continuous balancing can dissipate significant power.
Alternativas drop-in para L9967 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com L9967 (mesmo formato e footprint) — diferindo em Package, Communication Interface, Balancing Current, Number of Cells, Watchdog Timer.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
L9966
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$5.44 / unidade
Ver ficha técnica →BQ76952
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.65 / unidade
Ver ficha técnica →ADBMS6830
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
L9967 Especificações
| Number of Cells | Up to 14 series cells |
| Voltage Measurement Accuracy | ±10 mV |
| Current Sensing | Integrated shunt amplifier |
| ADC Resolution | 16-bit delta-sigma |
| Balancing Current | 300 mA (passive) |
| Communication Interface | SPI |
| Supply Voltage Range | 6 V to 72 V |
| Temperatura de operação | -40°C to +125°C |
| Encapsulamento | QFN-48 (7x7 mm) |
| Tipo de montagem | Surface Mount |
| AEC-Q100 | Qualified |
| RoHS | Compliant |
| Watchdog Timer | Programmable |
| Protection Features | Overvoltage, undervoltage, overtemperature |
| Daisy-Chain Support | Yes |
Configuração de pinos do L9967
| Pino 1 | VDD — Power supply input |
| Pino 2 | VSS — Ground |
| Pino 3 | SCK — SPI clock |
| Pino 4 | SDI — SPI data input |
| Pino 5 | SDO — SPI data output |
| Pino 6 | CS — Chip select |
| Pino 7 | CELL1 — Cell 1 sense input |
| Pino 8 | CELL2 — Cell 2 sense input |
| Pino 9 | CELL3 — Cell 3 sense input |
| Pino 10 | CELL4 — Cell 4 sense input |
| Pino 11 | CELL5 — Cell 5 sense input |
| Pino 12 | CELL6 — Cell 6 sense input |
Aplicações típicas
L9967 é adequado para 6 aplicaçãos: Electric Vehicle Battery Management, 48V Mild-Hybrid Systems, Industrial Energy Storage, Backup Power Systems, Telecom Battery Monitoring, Marine Battery Management.
Electric Vehicle Battery Management
The L9967 is used in EV battery management systems to monitor cell voltages, current, and temperature. Its high accuracy (±10 mV) enables precise state-of-charge estimation, extending battery life. The integrated balancing FETs allow passive balancing during charging, ensuring cell uniformity. The SPI interface connects to the main BMS controller, which manages charge/discharge cycles and protection. The AEC-Q100 qualification ensures reliability in harsh automotive environments.
Recomendado
48V Mild-Hybrid Systems
In 48V mild-hybrid vehicles, the L9967 monitors the 48V lithium-ion battery pack. It measures up to 14 cells, providing accurate voltage and current data for the hybrid control unit. The wide supply voltage range (6V to 72V) accommodates the 48V bus. The balancing function ensures cell equalization during regenerative braking. The SPI interface allows fast communication with the vehicle's ECU, enabling real-time battery management.
Recomendado
Industrial Energy Storage
The L9967 is used in industrial energy storage systems (ESS) for solar and wind power. It monitors large battery banks, ensuring safe operation and maximizing lifespan. The high balancing current (300 mA) allows efficient cell equalization in high-capacity packs. The device's robust protection features (overvoltage, undervoltage, overtemperature) prevent damage. The SPI interface enables daisy-chaining for very large systems.
Recomendado
Backup Power Systems
The L9967 is used in backup power systems (UPS) to monitor lead-acid or lithium-ion batteries. It provides accurate state-of-charge and health monitoring, ensuring reliable backup power. The device's low power consumption and wide voltage range make it suitable for always-on monitoring. The balancing function extends battery life by preventing cell imbalance. The SPI interface connects to the UPS controller for status reporting.
Recomendado
Telecom Battery Monitoring
The L9967 is used in telecom base stations to monitor backup batteries. It ensures the batteries are healthy and ready for use during power outages. The device's high accuracy and wide temperature range (-40°C to +125°C) make it suitable for outdoor installations. The balancing function maintains cell uniformity, extending battery life. The SPI interface allows remote monitoring via the base station controller.
Recomendado
Marine Battery Management
The L9967 is used in marine battery management systems for electric boats and yachts. It monitors the battery bank, ensuring safe operation in saltwater environments. The device's robust protection features and AEC-Q100 qualification (though not specifically marine) provide reliability. The balancing function maintains cell health, extending battery life. The SPI interface connects to the boat's control system.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para L9967 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | L9966 | BQ76952 | ADBMS6830 |
|---|---|---|---|---|
| Package | QFN-48 (7x7 mm) | QFN-48 (7x7 mm) | QFN-48 (7x7 mm) | QFN-48 (7x7 mm) |
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments | Analog Devices |
| Number of Cells | 14 | 12 | 16 | 16 |
| Balancing Current | 300 mA | 200 mA | 200 mA | 300 mA |
| Voltage Accuracy | ±10 mV | ±10 mV | ±10 mV | ±5 mV |
| ADC Resolution | 16-bit | 16-bit | 16-bit | 16-bit |
| Communication Interface | SPI | SPI | SPI | SPI |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified |
Principais diferenciais
- Higher balancing current (300 mA) than BQ76952 (vs BQ76952)
- AEC-Q100 qualified for automotive (vs ADBMS6830)
- STMicroelectronics ecosystem support (vs BQ76952)
Notas de projeto
Ensure a stable supply voltage between 6V and 72V. Use a 100nF decoupling capacitor close to the VDD pin and a 10uF bulk capacitor. For high-voltage packs, consider a pre-regulator to protect the IC from transients.
Place the L9967 close to the battery cells to minimize trace resistance and noise. Use a solid ground plane and route the SPI lines with controlled impedance. Keep the sense traces away from high-current paths to avoid measurement errors.
The balancing FETs can dissipate significant power during continuous balancing. Ensure adequate copper area on the exposed pad and consider a thermal via array. For high balancing currents, add a heatsink or airflow.
Informações de conformidade
AEC-Q100 qualified per ST datasheet. RoHS compliant. REACH compliance assumed from ST's environmental policy.
