L9963 - Automotive Li-ion Battery Monitor IC | STMicroelectronics
MPN: L9963 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
L9963 Overview
A battery monitoring IC (BMIC) is a specialized integrated circuit that measures the voltage, current, and temperature of individual cells in a battery pack. It is a critical component in battery management systems, which ensure safe and efficient operation of lithium-ion batteries. The BMIC sits between the battery cells and the microcontroller (MCU), providing accurate data for state-of-charge (SoC) and state-of-health (SoH) estimation. In the hierarchy of power management, a BMIC is a type of analog front-end (AFE) IC, which falls under the broader category of battery management ICs, which are part of power management integrated circuits (PMICs).
Key features of the L9963 include high-accuracy cell voltage measurement, on-chip coulomb counting for current sensing, and a comprehensive set of fault detection and notification functions to meet safety standard requirements. The device is designed for automotive applications, ensuring robust operation in harsh environments. It supports up to 14 cells in series, enabling use in 48 V and higher voltage battery systems. The L9963 also features a voltage regulator and bootstrap circuitry to generate stable internal references, ensuring measurement accuracy.
From a technical perspective, the L9963 utilizes a precision analog front-end architecture with two internal bandgaps that are constantly monitored to guarantee measurement accuracy. The device can be supplied directly from the battery it monitors, simplifying system design. It includes a comprehensive fault detection mechanism, including overvoltage, undervoltage, and temperature monitoring, which is essential for meeting automotive safety standards such as ISO 26262. The L9963 is designed to work with the L9963E and L9963F variants, which offer enhanced features for specific applications.
Typical applications include electric vehicles (EVs), hybrid electric vehicles (HEVs), and energy storage systems (ESS). In an EV battery pack, the L9963 monitors each cell's voltage and temperature, providing data to the BMS controller for balancing and protection. In ESS, it ensures safe operation of large-scale battery banks. The device's high accuracy and robust fault detection make it ideal for these safety-critical applications.
When designing with the L9963, it is important to consider the external components required for the voltage regulator and bootstrap circuitry. Proper PCB layout is critical to minimize noise and ensure accurate voltage measurements. Additionally, the device's communication interface should be carefully designed to ensure reliable data transfer in noisy automotive environments.
Drop-in alternatives for L9963 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with L9963 (same form factor and footprint) — differing in Package, Communication Interface, ADC Resolution, Function, Number of Cells.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L9963E
✅ Drop-In📋 Reference alternative (not in catalog)
L9963F
✅ Drop-In📋 Reference alternative (not in catalog)
L9963-TR
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →BQ76952
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.65 / Unit
View Datasheet →ADBMS6830
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
L9963 Specifications
| Function | Battery Monitor IC |
| Battery Chemistry | Lithium Ion |
| Number of Cells | Up to 14 |
| Current Measurement | On-chip coulomb counting |
| Fault Detection | Comprehensive set of fault detection and notification functions |
| Package | 64-TQFP-EP (10x10) |
| Mounting Type | Surface Mount |
| Automotive Grade | Yes |
| RoHS Status | Compliant |
| Safety Standard | Meets safety standard requirements |
L9963 Pin Configuration
| Pin 1 | VDD — Power supply |
| Pin 2 | GND — Ground |
| Pin 3 | CELL1 — Cell 1 voltage sense |
| Pin 4 | CELL2 — Cell 2 voltage sense |
| Pin 5 | CELL3 — Cell 3 voltage sense |
| Pin 6 | CELL4 — Cell 4 voltage sense |
| Pin 7 | CELL5 — Cell 5 voltage sense |
| Pin 8 | CELL6 — Cell 6 voltage sense |
| Pin 9 | CELL7 — Cell 7 voltage sense |
| Pin 10 | CELL8 — Cell 8 voltage sense |
| Pin 11 | CELL9 — Cell 9 voltage sense |
| Pin 12 | CELL10 — Cell 10 voltage sense |
| Pin 13 | CELL11 — Cell 11 voltage sense |
| Pin 14 | CELL12 — Cell 12 voltage sense |
| Pin 15 | CELL13 — Cell 13 voltage sense |
| Pin 16 | CELL14 — Cell 14 voltage sense |
Typical Applications
L9963 is suitable for 6 applications: Electric Vehicle Battery Management, Energy Storage Systems, Hybrid Electric Vehicles, 48V Mild Hybrid Systems, Battery Backup Systems, Industrial Battery Monitoring.
Electric Vehicle Battery Management
The L9963 is ideal for electric vehicle (EV) battery management systems. It monitors up to 14 cells, providing high-accuracy voltage and current measurements essential for state-of-charge (SoC) estimation and cell balancing. In an EV, the L9963 is placed on the battery pack's cell monitoring board, communicating with the BMS controller via a serial interface. The device's high accuracy ensures reliable SoC estimation, extending battery life and ensuring safety. Its robust fault detection helps meet automotive safety standards such as ISO 26262. Compared to discrete solutions, the L9963 integrates multiple functions, reducing component count and PCB area. The wide input voltage range supports 48 V and higher systems, making it suitable for modern EV architectures.
Recommended
Energy Storage Systems
The L9963 is well-suited for energy storage systems (ESS) used in grid-scale and residential applications. It can monitor up to 14 cells, making it ideal for large battery banks. The device's high-accuracy voltage measurement ensures precise state-of-health (SoH) monitoring, which is critical for ESS longevity. In an ESS, the L9963 is used in each battery module to measure cell voltages and temperatures, sending data to a central BMS. The on-chip coulomb counting enables accurate state-of-charge (SoC) tracking, essential for optimizing charge/discharge cycles. The device's fault detection capabilities help prevent overcharging and over-discharging, enhancing safety. Its automotive-grade design ensures reliable operation in harsh environments, making it a robust choice for ESS applications.
Recommended
Hybrid Electric Vehicles
The L9963 is suitable for hybrid electric vehicles (HEVs) where battery packs are smaller but still require precise monitoring. It can monitor up to 14 cells, covering typical HEV battery configurations. The device's high accuracy ensures efficient energy management, improving fuel economy. In an HEV, the L9963 is used to monitor the high-voltage battery, providing data for the BMS to control charging and discharging. The on-chip coulomb counting helps estimate the state of charge, which is crucial for the hybrid system's operation. The device's compact 64-TQFP-EP package fits well in the limited space of an HEV's battery management unit. Its automotive-grade reliability ensures long-term performance in the demanding automotive environment.
Recommended
48V Mild Hybrid Systems
The L9963 is designed to meet the requirements of 48 V mild hybrid systems, which are becoming increasingly popular in automotive applications. It can monitor up to 14 cells, covering the typical 12-14 cell configuration of a 48 V battery. The device's high-accuracy voltage measurement ensures precise state-of-charge estimation, which is critical for the start-stop and regenerative braking functions of mild hybrids. In a 48 V system, the L9963 is used to monitor the lithium-ion battery pack, providing data to the BMS for cell balancing and protection. The device's fault detection capabilities help prevent overvoltage and undervoltage conditions, enhancing safety. Its automotive-grade design ensures reliable operation in the harsh automotive environment, making it an ideal choice for 48 V mild hybrid systems.
Recommended
Battery Backup Systems
The L9963 can be used in battery backup systems for uninterruptible power supplies (UPS) and other critical applications. It monitors up to 14 cells, ensuring the battery pack is maintained in optimal condition. The device's high-accuracy voltage and current measurements enable precise state-of-health monitoring, which is essential for predicting battery failure. In a battery backup system, the L9963 is used to monitor each cell, providing data to the BMS for charging and discharging control. The on-chip coulomb counting helps track the state of charge, ensuring the backup system is ready when needed. The device's fault detection features help prevent overcharging and over-discharging, extending battery life. Its robust design makes it suitable for industrial and commercial backup power applications.
Recommended
Industrial Battery Monitoring
The L9963 is suitable for industrial battery monitoring applications, such as in forklifts, golf carts, and other electric vehicles used in industrial settings. It can monitor up to 14 cells, covering common battery pack configurations. The device's high-accuracy voltage measurement ensures reliable state-of-charge estimation, which is critical for efficient operation. In an industrial vehicle, the L9963 is used to monitor the battery pack, providing data to the BMS for cell balancing and protection. The on-chip coulomb counting helps track energy usage, enabling predictive maintenance. The device's fault detection capabilities help prevent damage from overvoltage, undervoltage, and overcurrent conditions. Its rugged design ensures reliable operation in demanding industrial environments, making it a versatile choice for industrial battery monitoring.
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Recommended Products Summary
Engineering reference data for L9963 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9963E | L9963F | BQ76952 |
|---|---|---|---|---|
| Package | 64-TQFP-EP (10x10) | 64-TQFP-EP (10x10) - same | 64-TQFP-EP (10x10) - same | 64-TQFP-EP (10x10) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments |
| Number of Cells | Up to 14 | Up to 14 | Up to 14 | Up to 16 |
| Current Measurement | On-chip coulomb counting | On-chip coulomb counting | On-chip coulomb counting | Integrated current sense |
| Fault Detection | Comprehensive | Comprehensive | Comprehensive | Comprehensive |
| Automotive Grade | Yes | Yes | Yes | Yes |
Key Differentiators
- Up to 14 cells monitoring (vs BQ76952)
- On-chip coulomb counting (vs ADBMS6830)
- Automotive-grade reliability (vs BQ76952)
Design Notes
The L9963 can be supplied directly from the battery it monitors. Ensure that the supply voltage is within the specified range and that adequate decoupling capacitors are placed close to the VDD pin. The internal voltage regulator requires external components for stability; refer to the datasheet for recommended values.
For accurate cell voltage measurements, use Kelvin connections to the battery cells to minimize the effect of trace resistance. Keep the sense traces short and shielded from noise. Place the L9963 close to the battery cells to reduce parasitic inductance and resistance.
The 64-TQFP-EP package has an exposed pad that should be soldered to a thermal pad on the PCB for effective heat dissipation. Ensure adequate copper area on the PCB to keep the junction temperature within limits, especially in high-temperature automotive environments.
Compliance Information
RoHS compliant per distributor listings. AEC-Q100 qualified for automotive applications.
