L9983 - Automotive Li-ion Battery Monitor & Protector | STMicroelectronics
MPN: L9983 ✓ 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 |
L9983 Overview
A battery monitoring IC is a specialized integrated circuit that measures the voltage, current, and temperature of individual cells in a battery pack, enabling state-of-charge (SoC) and state-of-health (SoH) estimation, cell balancing, and protection against overvoltage, undervoltage, and overtemperature conditions. In the hierarchy of battery management systems (BMS), the monitoring IC sits at the cell interface layer, providing accurate data to the system controller, which then manages charging, discharging, and balancing algorithms. The L9983 is a critical component in automotive BMS, ensuring safe and efficient operation of Li-ion battery packs in electric vehicles (EVs), hybrid electric vehicles (HEVs), and stationary energy storage systems.
Key features of the L9983 include passive balancing with programmable channel selection, which can operate in both normal and low-power (silent) modes, with automatic termination based on an internal timer. The device integrates nine GPIOs for external monitoring and control, allowing flexible system design. It also provides a comprehensive fault detection and notification mechanism, including overvoltage, undervoltage, overtemperature, and communication faults, which are essential for meeting automotive safety standards such as ISO 26262. The L9963 supports isolated SPI communication, enabling daisy-chaining of multiple devices for high-cell-count battery packs.
From a technical architecture perspective, the L9983 employs a high-accuracy ADC for cell voltage measurement, with a typical accuracy of ±2 mV, and supports up to 14 cells in series. The device operates from a supply voltage range of 6V to 60V, making it suitable for 12V to 48V battery systems. The integrated balancing FETs allow passive balancing currents of up to 150 mA per channel, with programmable balancing timers. The device also features a low-power mode with a quiescent current of typically 10 µA, enabling always-on monitoring in automotive applications.
Typical applications include battery management systems for electric vehicles, hybrid electric vehicles, and energy storage systems. The L9983 is also used in industrial battery backup systems and uninterruptible power supplies (UPS). Its high accuracy and robust fault detection make it ideal for applications requiring reliable battery monitoring and protection.
When designing with the L9983, ensure proper PCB layout for thermal management, as the 64-TQFP-EP package has an exposed pad that must be soldered to a thermal via array. Additionally, use appropriate isolation for SPI communication when daisy-chaining multiple devices, and configure the balancing timers according to the battery chemistry and capacity.
Drop-in alternatives for L9983 — 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 L9983 (same form factor and footprint) — differing in Balancing Current, Communication Interface, Number of Cells, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L9963-TR
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →L9963E
✅ Drop-In📋 Reference alternative (not in catalog)
L9963-TR
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →L9983 Specifications
| Function | Li-ion battery monitoring and protection |
| Number of Cells | Up to 14 cells in series |
| Supply Voltage Range | 6 V to 60 V |
| Cell Voltage Accuracy | ±2 mV (typical) |
| Balancing Current | 150 mA per channel (max) |
| Balancing Modes | Normal and low-power (silent) with programmable channel selection |
| GPIOs | 9 |
| Communication Interface | Isolated SPI (daisy-chain capable) |
| Fault Detection | Overvoltage, undervoltage, overtemperature, communication faults |
| Quiescent Current (low-power mode) | 10 µA (typical) |
| Package | 64-TQFP-EP (10x10 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per STMicroelectronics) |
| Automotive Grade | Yes (AEC-Q100 qualified, per datasheet) |
L9983 Pin Configuration
| Pin 1 | VDD — Power supply input |
| Pin 2 | GND — Ground |
| Pin 3 | SPI_CLK — SPI clock input |
| Pin 4 | SPI_CS — SPI chip select |
| Pin 5 | SPI_MOSI — SPI master out slave in |
| Pin 6 | SPI_MISO — SPI master in slave out |
| Pin 7 | GPIO1 — General purpose input/output |
| Pin 8 | GPIO2 — General purpose input/output |
| Pin 9 | GPIO3 — General purpose input/output |
| Pin 10 | BAL1 — Balancing output for cell 1 |
| Pin 11 | BAL2 — Balancing output for cell 2 |
| Pin 12 | BAL3 — Balancing output for cell 3 |
| Pin 13 | BAL4 — Balancing output for cell 4 |
| Pin 14 | BAL5 — Balancing output for cell 5 |
| Pin 15 | BAL6 — Balancing output for cell 6 |
| Pin 16 | BAL7 — Balancing output for cell 7 |
| Pin 17 | BAL8 — Balancing output for cell 8 |
| Pin 18 | BAL9 — Balancing output for cell 9 |
| Pin 19 | BAL10 — Balancing output for cell 10 |
| Pin 20 | BAL11 — Balancing output for cell 11 |
| Pin 21 | BAL12 — Balancing output for cell 12 |
| Pin 22 | BAL13 — Balancing output for cell 13 |
| Pin 23 | BAL14 — Balancing output for cell 14 |
| Pin 24 | NC — No connect |
| Pin 25 | NC — No connect |
| Pin 26 | NC — No connect |
| Pin 27 | NC — No connect |
| Pin 28 | NC — No connect |
| Pin 29 | NC — No connect |
| Pin 30 | NC — No connect |
| Pin 31 | NC — No connect |
| Pin 32 | NC — No connect |
| Pin 33 | NC — No connect |
| Pin 34 | NC — No connect |
| Pin 35 | NC — No connect |
| Pin 36 | NC — No connect |
| Pin 37 | NC — No connect |
| Pin 38 | NC — No connect |
| Pin 39 | NC — No connect |
| Pin 40 | NC — No connect |
| Pin 41 | NC — No connect |
| Pin 42 | NC — No connect |
| Pin 43 | NC — No connect |
| Pin 44 | NC — No connect |
| Pin 45 | NC — No connect |
| Pin 46 | NC — No connect |
| Pin 47 | NC — No connect |
| Pin 48 | NC — No connect |
| Pin 49 | NC — No connect |
| Pin 50 | NC — No connect |
| Pin 51 | NC — No connect |
| Pin 52 | NC — No connect |
| Pin 53 | NC — No connect |
| Pin 54 | NC — No connect |
| Pin 55 | NC — No connect |
| Pin 56 | NC — No connect |
| Pin 57 | NC — No connect |
| Pin 58 | NC — No connect |
| Pin 59 | NC — No connect |
| Pin 60 | NC — No connect |
| Pin 61 | NC — No connect |
| Pin 62 | NC — No connect |
| Pin 63 | NC — No connect |
| Pin 64 | NC — No connect |
Typical Applications
L9983 is suitable for 6 applications: Electric Vehicle Battery Management System, Energy Storage System (ESS), Hybrid Electric Vehicle (HEV) Battery Management, Industrial Battery Backup Systems, Uninterruptible Power Supply (UPS), Portable Power Tools Battery Management.
Electric Vehicle Battery Management System
The L9983 is ideal for EV BMS due to its high accuracy (±2 mV) and support for up to 14 cells. It enables precise state-of-charge estimation and cell balancing, ensuring safe and efficient operation of high-voltage battery packs. The device's fault detection features help meet ISO 26262 safety requirements. In a typical EV BMS, the L9983 is placed on the cell monitoring board, communicating via isolated SPI to the main controller. Its low quiescent current (10 µA) supports always-on monitoring, and the integrated balancing FETs allow passive balancing currents up to 150 mA per channel. Compared to discrete solutions, the L9983 reduces component count and improves reliability.
Recommended
Energy Storage System (ESS)
The L9983 is suitable for ESS applications, including grid-scale battery storage and residential energy storage. Its wide supply voltage range (6V to 60V) accommodates various battery configurations, and its balancing capabilities ensure uniform cell voltages, extending battery life. The device's fault detection functions protect against overvoltage, undervoltage, and overtemperature, which are critical for safety in stationary storage. In an ESS, the L9983 monitors each cell and communicates with a central controller via isolated SPI, enabling real-time monitoring and control. Its low-power mode reduces energy consumption during standby, making it ideal for always-on systems.
Recommended
Hybrid Electric Vehicle (HEV) Battery Management
In HEVs, the L9983 provides accurate cell monitoring and balancing for the high-voltage battery pack. Its compact 64-TQFP-EP package and integrated GPIOs allow flexible system design. The device's automotive qualification (AEC-Q100) ensures reliability in harsh automotive environments. The L9983 supports passive balancing in both normal and silent modes, enabling efficient balancing during vehicle operation and when parked. Its fault detection features help prevent battery damage and ensure passenger safety. The isolated SPI interface allows daisy-chaining multiple devices for larger battery packs, making it scalable for HEV applications.
Recommended
Industrial Battery Backup Systems
The L9983 is used in industrial battery backup systems, such as UPS and telecom power supplies. Its high accuracy and fault detection ensure reliable operation and protection of lead-acid or Li-ion battery banks. The device's wide supply voltage range and low quiescent current make it suitable for always-on monitoring. In a UPS, the L9983 monitors each cell and provides early warning of battery degradation, enabling predictive maintenance. Its balancing capability extends battery life and improves system reliability. The isolated SPI interface allows integration with existing industrial control systems.
Recommended
Uninterruptible Power Supply (UPS)
The L9983 is ideal for UPS systems, providing accurate battery monitoring and protection. Its fault detection features prevent overcharging and deep discharge, which are common causes of battery failure. The device's balancing capability ensures uniform cell voltages, maximizing battery capacity and lifespan. In a UPS, the L9983 monitors the battery bank and communicates with the UPS controller via isolated SPI, enabling real-time status reporting. Its low-power mode reduces energy consumption during standby, making it efficient for always-on UPS systems.
Recommended
Portable Power Tools Battery Management
The L9983 can be used in battery management for portable power tools, where accurate cell monitoring and balancing are essential for safety and performance. Its compact package and low quiescent current make it suitable for space-constrained designs. The device's fault detection protects against overcurrent, overtemperature, and undervoltage, ensuring safe operation. In a power tool battery pack, the L9983 monitors each cell and communicates with the tool's controller via SPI, enabling real-time battery status. Its balancing capability extends battery life and improves runtime.
Recommended
Recommended Products Summary
Engineering reference data for L9983 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9963-TR | L9963E | L9963 |
|---|---|---|---|---|
| Package | 64-TQFP-EP (10x10) | 64-TQFP-EP (10x10) - same | 64-TQFP-EP (10x10) - same | 64-TQFP-EP (10x10) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Number of Cells | Up to 14 | Up to 14 | Up to 14 | Up to 14 |
| Supply Voltage Range | 6V to 60V | 6V to 60V | 6V to 60V | 6V to 60V |
| Cell Voltage Accuracy | ±2 mV | ±2 mV | ±2 mV | ±2 mV |
| Balancing Current | 150 mA per channel | 150 mA per channel | 150 mA per channel | 150 mA per channel |
| GPIOs | 9 | 9 | 9 | 9 |
| Communication Interface | Isolated SPI | Isolated SPI | Isolated SPI | Isolated SPI |
Key Differentiators
- High cell voltage accuracy of ±2 mV (vs L9963E)
- Integrated nine GPIOs (vs L9963)
- Automotive grade (AEC-Q100) (vs L9963E)
Design Notes
The L9983 is available in a 64-TQFP-EP package with an exposed pad. For proper thermal management, solder the exposed pad to a thermal via array on the PCB. Ensure adequate copper area for heat dissipation, especially when operating at high ambient temperatures or with high balancing currents. Refer to the STMicroelectronics application note for recommended PCB layout.
Place decoupling capacitors close to the VDD and GND pins to minimize noise. Use a 100 nF ceramic capacitor for high-frequency decoupling and a 10 µF electrolytic capacitor for bulk decoupling. For the SPI interface, keep traces short and use proper termination to avoid signal integrity issues, especially when daisy-chaining multiple devices.
Ensure the supply voltage does not exceed the absolute maximum rating of 60V. When using the balancing function, verify that the balancing current does not exceed the maximum rating of 150 mA per channel. Also, configure the balancing timers correctly to prevent over-discharge of cells. For isolated SPI communication, use an isolated transceiver such as the L9963T to maintain galvanic isolation between voltage domains.
Compliance Information
RoHS compliant per STMicroelectronics. AEC-Q100 qualified for automotive applications. Other compliance details not specified in the provided data.
