L9961 datasheet(2/63 Pages) STMICROELECTRONICS

2 / 63 page

Description

L9961 is part of a complete battery pack monitoring, balancing, and protecting system for Li-Ion and Li-Polymer

cells in 3, 4 or 5 series configurations. The L9961 uses a high precision ADC to provide cell voltage, stack

voltage and temperature conversion via external NTC. Voltage monitoring functions are cyclically performed with

a programmable loop time. Stack current is also monitored via a high accuracy CSA, continuously running and

performing also Coulomb counting. Cell balancing is available and can be simultaneously activated on all cells.

IC configuration and information exchange for SOC/SOH estimation are performed via I2C peripheral. The IC

also integrates a dual pre-driver programmable in both HS/LS configurations for driving pack relays. L9961 also

implements battery pack fuse protection to prevent fire and explosion hazards. A 3.3 V regulator with a high

current capability is available for supplying pack controller and other external circuitry in both standby and normal

operation modes. The IC protects the battery pack against over/under voltage conditions and monitors for over/

under temperature. It also features protection against overcurrent (both directions) and short-circuit in discharge

events. Safety-relevant configurations can be stored in the internal NVM to avoid re-programming the device at

each wakeup.

L9961

DS14012 - Rev 1

page 2/63

L9961 Arkusz danych(PDF) 2 Page - STMicroelectronics