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【ST Battery Management】L99BM114 Multicell battery monitoring and balancing IC

Product Description of L99BM114

L99BM114 is a Li-ion battery monitoring and protecting chip for high-reliability industrial applications and energy storage systems. Up to 14 stacked battery cells can be monitored to meet the requirements of 48 V and higher voltage systems.

Up to 31 L99BM114 can be connected in a daisy chain and communicate with one host processor via the transformer or capacitive isolated interfaces, featuring high-speed, low EMI, long distance, and reliable data transmission. Passive balancing with programmable channel selection is offered in both normal and low power mode (silent balance).

The L99BM114 features a comprehensive set of fault detection and notification functions to meet system safety standard requirements.

Product Attributes of L99BM114

Function：Multi-Function Controller

Battery Chemistry：Lithium Ion

Number of Cells：4 ~ 14

Fault Protection：Over Current, Over Temperature, Over/Under Voltage

Interface：SPI

Operating Temperature：-40°C ~ 105°C (TA)

Features of L99BM114

4 to 14 series cells battery monitoring and balancing

64 V operating voltage

Supports busbar connection without altering cell results

Independent 16-bit voltage ADC for each channel with accuracy less than 2 mV

18-bit ADC current measurement with coulomb counter

Fully synchronized current and voltage samples

Intelligent diagnostic routine providing automatic failure validation. Redundant fault notification through both SPI Global Status Word (GSW) and the dedicated FAULT line

9 GPIOs, with up to 7 analog inputs for NTC sensing

Internal passive balancing up to 200 mA. Possibility to drive external balancing transistors

2.66 Mbps isolated serial communication or up to 5 MHz SPI

Two 5 V regulators supporting external load connection with 25 mA (VCOM) and 50 mA (VTREF) current capability

Embedded NVM for customer parameters storage

System safety ready

64-pin TQFP package

Application of L99BM114

48 V and high-voltage battery packs

Backup energy storage systems and UPS

E-bikes, e-scooters

Portable and semi-portable equipment