L9967-TR - Automotive Battery Monitoring IC | STMicroelectronics
Référence : L9967-TR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.65 | $76,50 |
| 100 | $6.8 | $680,00 |
| 500 | $6.12 | $3 060,00 |
| 1 000 | $5.5 | $5 500,00 |
L9967-TR Présentation
A battery monitoring IC is a specialized analog front-end that measures individual cell voltages, temperatures, and pack current to enable state-of-charge (SoC) and state-of-health (SoH) estimation. It sits between the battery pack and the microcontroller, providing accurate, isolated measurements and balancing control. In the system hierarchy, it is a key component of a Battery Management System (BMS), which itself is part of the broader power management and energy storage domain.
Key features include a 16-bit ADC with a measurement accuracy of ±2 mV, support for up to 14 series-connected cells, and a built-in passive balancing current of up to 150 mA. The device also includes a 5V/50mA LDO output for powering external components, a watchdog timer, and a sleep mode with a quiescent current of 10 µA. The L9967-TR is AEC-Q100 qualified, ensuring reliability in automotive environments.
The L9967-TR uses a high-voltage CMOS process, enabling direct connection to battery stacks without external level shifting. Its SPI interface supports daisy-chaining multiple devices for larger packs, and the integrated diagnostics provide open-wire and over-temperature detection. The device is available in a 48-pin TQFP package with exposed pad, offering a compact solution for space-constrained BMS designs.
Typical applications include electric vehicle (EV) battery management, hybrid electric vehicle (HEV) battery packs, 48V mild-hybrid systems, and industrial energy storage systems. The L9967-TR's high accuracy and robust diagnostics make it ideal for safety-critical applications where precise cell monitoring is essential.
When designing with the L9967-TR, ensure proper PCB layout with a solid ground plane and adequate decoupling on the supply pins. The SPI lines should be kept short and shielded to minimize noise, and the thermal pad must be soldered to a copper pour for effective heat dissipation.
Alternatives de remplacement direct pour L9967-TR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec L9967-TR (même facteur de forme et même empreinte) — différant par Balancing Current, Number of Cells, Package, Watchdog Timer.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
L9967
✅ Remplacement direct✓ En stock
$5.44 / unité
Voir la fiche technique →L9967-TR Spécifications
| Supply Voltage Range | 6 V to 72 V |
| Number of Cells | Up to 14 series |
| ADC Resolution | 16-bit delta-sigma |
| Cell Voltage Accuracy | ±2 mV |
| Balancing Current | 150 mA (passive) |
| LDO Output | 5 V / 50 mA |
| Quiescent Current (Sleep) | 10 µA |
| Communication Interface | SPI |
| Température de fonctionnement | -40°C to +125°C |
| Boîtier | TQFP-48 (7x7 mm) |
| Type de montage | Surface Mount |
| AEC-Q100 | Qualified |
| RoHS | Compliant |
| Watchdog Timer | Yes |
| Diagnostics | Open-wire, over-temperature |
Configuration des broches de L9967-TR
| Broche 1 | VDD — Power supply input (6V to 72V) |
| Broche 2 | VSS — Ground |
| Broche 3 | SPI_CS — SPI chip select |
| Broche 4 | SPI_SCK — SPI clock |
| Broche 5 | SPI_SDI — SPI data input |
| Broche 6 | SPI_SDO — SPI data output |
| Broche 7 | CELL1 — Cell 1 voltage sense |
| Broche 8 | CELL2 — Cell 2 voltage sense |
| Broche 9 | CELL3 — Cell 3 voltage sense |
| Broche 10 | CELL4 — Cell 4 voltage sense |
| Broche 11 | CELL5 — Cell 5 voltage sense |
| Broche 12 | CELL6 — Cell 6 voltage sense |
| Broche 13 | CELL7 — Cell 7 voltage sense |
| Broche 14 | CELL8 — Cell 8 voltage sense |
| Broche 15 | CELL9 — Cell 9 voltage sense |
| Broche 16 | CELL10 — Cell 10 voltage sense |
| Broche 17 | CELL11 — Cell 11 voltage sense |
| Broche 18 | CELL12 — Cell 12 voltage sense |
| Broche 19 | CELL13 — Cell 13 voltage sense |
| Broche 20 | CELL14 — Cell 14 voltage sense |
| Broche 21 | LDO_OUT — 5V LDO output |
| Broche 22 | BAL — Balancing control |
| Broche 23 | TEMP1 — Temperature sensor input 1 |
| Broche 24 | TEMP2 — Temperature sensor input 2 |
Applications typiques
L9967-TR convient pour 6 applications: Electric Vehicle Battery Management, 48V Mild-Hybrid Systems, Industrial Energy Storage, Backup Power Systems, Telecom Battery Monitoring, Marine Battery Systems.
Electric Vehicle Battery Management
The L9967-TR provides precise cell voltage and temperature monitoring for EV battery packs. Its ±2 mV accuracy and 16-bit ADC enable accurate state-of-charge estimation, while the passive balancing function equalizes cell voltages to extend pack life. The SPI interface allows direct connection to the vehicle's BMS microcontroller, and the AEC-Q100 qualification ensures reliability in automotive environments. In a typical EV application, the L9967-TR is placed on the battery management board, connected to each cell via a sensing harness, and communicates with the main controller to manage charging and discharging.
Recommandé
48V Mild-Hybrid Systems
The L9967-TR is well-suited for 48V mild-hybrid battery systems, where it monitors up to 14 cells and provides balancing. Its 72V maximum supply voltage accommodates the 48V bus with headroom, and the low 10 µA sleep current helps preserve battery charge when the vehicle is off. The integrated LDO output can power external sensors or a CAN transceiver. In this application, the L9967-TR is typically mounted on the battery management unit, interfacing with the engine control unit via SPI or CAN.
Recommandé
Industrial Energy Storage
For industrial energy storage systems, the L9967-TR offers reliable monitoring of battery racks with up to 14 series cells. Its wide operating temperature range (-40°C to +125°C) suits harsh industrial environments, and the SPI interface enables easy integration with industrial controllers. The passive balancing function helps maintain cell uniformity, improving system efficiency and lifespan. The device's diagnostics, including open-wire detection, enhance system safety by identifying faulty connections.
Recommandé
Backup Power Systems
The L9967-TR is used in backup power systems (UPS) to monitor lead-acid or lithium battery banks. Its high accuracy ensures reliable state-of-health assessment, and the low sleep current minimizes power consumption during standby. The device can trigger alarms via its diagnostic features if cell voltages drift out of range. In a UPS, the L9967-TR is connected to the battery bank and communicates with the UPS controller to manage charging and alerting.
Recommandé
Telecom Battery Monitoring
In telecom base stations, the L9967-TR monitors backup battery banks to ensure uninterrupted operation. Its wide supply range and robust diagnostics make it suitable for remote monitoring applications. The SPI interface allows connection to a remote telemetry unit, and the low quiescent current is critical for battery-powered backup systems. The device's AEC-Q100 qualification also ensures reliability in outdoor environments.
Recommandé
Marine Battery Systems
The L9967-TR is suitable for marine battery monitoring, where reliability and accuracy are paramount. Its wide temperature range and AEC-Q100 qualification ensure operation in marine environments. The device can monitor 12V or 24V battery banks, and its balancing function helps maintain battery health. In marine applications, the L9967-TR is often integrated into a battery management system that interfaces with navigation and engine control systems.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour L9967-TR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | L9967 | ADBMS1818 | BQ76952 |
|---|---|---|---|---|
| Package | TQFP-48 | TQFP-48 (same) | LQFP-64 (different) | TQFP-48 (different pinout) |
| Brand | STMicroelectronics | STMicroelectronics | Analog Devices | Texas Instruments |
| Number of Cells | 14 | 14 | 16 | 16 |
| ADC Resolution | 16-bit | 16-bit | 16-bit | 16-bit |
| Cell Voltage Accuracy | ±2 mV | ±2 mV | ±1.5 mV | ±2 mV |
| Balancing Current | 150 mA | 150 mA | 200 mA | 200 mA |
| Supply Voltage Range | 6V to 72V | 6V to 72V | 6V to 80V | 4V to 80V |
| Communication Interface | SPI | SPI | SPI | I2C/SPI |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified |
Principaux différenciateurs
- AEC-Q100 qualified for automotive (vs BQ76952)
- Integrated 5V/50mA LDO (vs ADBMS1818)
- Lower quiescent current in sleep mode (vs ADBMS1818)
Notes de conception
Place decoupling capacitors (100nF and 10µF) close to the VDD pin. Use a solid ground plane and connect the exposed pad to ground for thermal and electrical performance. Keep SPI traces short and shielded to minimize noise.
The L9967-TR dissipates power during balancing (up to 150mA per channel). Ensure adequate copper area on the PCB to handle the heat. For high cell counts, consider using a thermal pad with vias to the ground plane.
Do not exceed the maximum supply voltage of 72V. Ensure proper cell voltage sensing connections to avoid open-wire faults. Use series resistors on cell sense lines to limit current in case of a fault.
Informations de conformité
AEC-Q100 qualified per STMicroelectronics. RoHS compliant. REACH compliance assumed based on ST's general compliance.
