Battery Management IC Ensures Longer Lasting Lithium Power in Portable Equipment
The L9962 is a lithium-battery management integrated circuit (IC) designed to deliver superior precision and enhance the health and longevity of lithium-ion (Li-ion) and lithium-polymer (Li-Po) battery packs. It achieves this by integrating a 12-bit analog-digital converter (ADC) and providing a generous 70mA cell-balancing current, which ensures rapid voltage correction across the battery pack.
This IC is engineered for battery packs with up to 10 series-connected cells, offering comprehensive monitoring, balancing, and protection functionalities. Its primary role is to optimize battery performance, enhance safety, and improve stability in a wide array of portable and semi-portable equipment. A key differentiator is its ultra-low quiescent current, which maximizes runtime and enables power-saving modes like 5µA standby and 2µA deep-sleep, crucial for products in transit.
Beyond its core management capabilities, the L9962 integrates a high-accuracy current-sense amplifier for stack-current measurement using Coulomb counting, ensuring precise charge and discharge current detection. Further adding value, it includes features such as battery-pack fuse management, configurable pre-drivers for relays, and a 3.3V low-dropout regulator (LDO) to power external components. These integrated features reduce the need for external circuitry, simplifying design and potentially lowering the bill of materials.
Specifications
| Product | Function | Supported Cell Count | Cell Balancing Current | ADC Resolution | Current Measurement Accuracy | Quiescent Current (Standby/Deep-sleep) | Package | Price (1000 pcs) |
|---|---|---|---|---|---|---|---|---|
| L9962 | Li-ion/Li-Po Battery Management IC | Up to 10 series-connected cells | 70mA | 12-bit | 0.25% | 5µA standby / 2µA deep-sleep | 7mm x 7mm 48-pin TQFP | From $2.89 |
Key Features
- Integrates a 12-bit analog-digital converter (ADC) for superior precision.
- Provides a generous 70mA cell-balancing current for rapid voltage correction.
- Supports lithium-ion (Li-ion) and lithium-polymer (Li-Po) battery packs with up to 10 series-connected cells.
- Offers comprehensive monitoring, balancing, and protection functions for optimized performance and enhanced safety.
- Features ultra-low quiescent current, including 5µA standby and 2µA deep-sleep modes, to maximize runtime.
- Continuously measures individual cell voltages with programmable loop time.
- Activates balancing and cell protection upon detecting overvoltage or undervoltage conditions.
- Includes plausibility checking by comparing total stack voltage with the number of cells.
- Maintains voltage-measurement accuracy across the full operating-temperature range.
- Integrates a high-accuracy current-sense amplifier for stack-current measurement using Coulomb counting.
- Detects excessive charge and discharge currents and provides short-circuit discharge protection.
- Achieves 0.25% current-measurement accuracy over the full temperature range, easily calibrated with a single point.
- Provides thermal monitoring with an NTC thermistor for accurate ratiometric measurements of battery-pack temperature.
- Includes integrated battery-pack fuse management and configurable high-side/low-side pre-drivers for battery-pack relays.
- Features a 3.3V low-dropout regulator (LDO) that remains active in standby mode to power external components.
- Offers an I2C interface for host system configuration and readout of battery state-of-charge (SOC) and state-of-health (SOH).
Applications
- Cordless power tools
- Portable and semi-portable equipment
- Medical devices
- Light electric vehicles (e.g., e-bikes and scooters)
- Backup energy storage systems (e.g., UPS units)
Avalaibility
The ST L9962 lithium-battery management IC is in production now and is available in a 7 mm × 7 mm 48-pin TQFP package. The device is listed as in stock through the ST Online Store, where the L9962-TR can be ordered directly
