Monitoring/protection/cell-balancing
The monitoring/protection/cell-balancing/authentication is responsible for protecting, monitoring, balancing and authenticating the battery pack. The data that is monitored includes individual cell voltage. It also implements active/passive cell balancing of each battery cell inside the battery pack. Additionally it can control the charge and discharge FET present in the battery pack.
Products
Battery monitors & balancers
BQ76907—Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement
BQ76942—3-series to 10-series multicell battery monitor and protector
BQ76905—Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement
BQ76925—Analog front end for 3 to 6 series lithium-ion cells
Battery protectors
BQ77216—Voltage and temperature protection for 3-s to 16-s cell Li-ion batteries with internal delay timer
BQ77207—3-series to 7-series cell Li-ion battery, internal delay timer, voltage and temperature protector
Battery management control unit
The Battery Management Control Unit consists of a host MCU, which can communicate and configure the battery analog front end. It also implements the State of Charge (SoC) and State of Health (SoH) monitoring of the battery pack. This sub-system can be configured and the battery pack SoC, SoH can be monitored using a host MCU. Additionally it can implement a communication interface outside of the battery-pack for status monitoring and indication purposes.
Products
MSP430 microcontrollers
MSP430G2553—16 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer
Linear & low-dropout (LDO) regulators
TPS7B81—150-mA, off-battery (40-V), ultra-low-IQ, low-dropout (LDO) voltage regulator with enable
TLV767—Adjustable- and fixed-output, 1-A, 16-V, positive-voltage low-dropout (LDO) linear regulator
TLV709—150-mA 30-V low-dropout (LDO) linear regulator with 3.2-μA supply current
TLV703—300-mA, high-PSRR, low-IQ, low-dropout voltage regulator
Series voltage references
REF4132—12-ppm/°C low-noise low-power precision voltage reference
REF35—650-nA quiescent current, 12-ppm/°C drift, ultra-low-power precision voltage reference
REF5040—4.096-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference
Shunt voltage references
ATL431LI—Low-IQ programmable shunt regulator offered in an ultra-small DQN package
ATL431LI-Q1—Automotive, high-bandwidth, low-IQ programmable shunt regulator (pinout: KRA)
TL431—Adjustable precision shunt regulator
Battery protectors
BQ77216—Voltage and temperature protection for 3-s to 16-s cell Li-ion batteries with internal delay timer
BQ77207—3-series to 7-series cell Li-ion battery, internal delay timer, voltage and temperature protector
Current & temperature sensing
The Current & Temperature Sensing subsystem consists of opamps, comparators and temperature sensors, which continuously monitor the battery pack temperature and charging/discharging current. The current and temperature information is sent to MCU, AFE or fuel gauge to monitor the battery pack SoC and SoH.
Products
General-purpose op amps
TLV9002—Dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications
TLV9001—One-channel, 1-MHz rail-to-rail input and output 1.8-V to 5.5-V operational amplifier
OPA990—Single, 40-V, 1.1-MHz, low-power operational amplifier
LM358B—Dual, 36-V, 1.2-MHz, 3-mV offset voltage operational amplifier with -40°C to 85°C operation
Comparators
TL331LV—1.65-V to 5.5-V, low-voltage single standard comparator with Pin 4 output
LM393LV-Q1—Automotive low-voltage commodity comparator
TLV1851—Single nanopower high-voltage comparator with push-pull output
Pre-charge/charge/discharge
The pre-charge/charge/discharge is used to provide pre-charge via and protect the battery pack from abnormalities such as overvoltage, overcurrent charging/discharging, overtemperature and external short-circuit. This can be implemented by using two low voltage FETs, which are controlled by the battery analog front end or the fuel gauge/ MCU.
Products
N-channel MOSFETs
CSD17578Q3A—30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 9.4 mOhm
CSD18511Q5A—40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.3 mOhm
CSD13381F4—12-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6mm, 180 mOhm, gate ESD protection
CSD19536KTT—100-V, N channel NexFET™ power MOSFET, single D2PAK, 2.4 mOhm
P-channel MOSFETs
CSD23381F4—-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 1 mm, 175 mOhm, gate ESD protection
Battery protectors
BQ77216—Voltage and temperature protection for 3-s to 16-s cell Li-ion batteries with internal delay timer
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