Battery pack with protector+fuel gauge

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.

N-channel MOSFETs

CSD17573Q5B—30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 1.45 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

Battery protectors

BQ76200—High-side n-channel FET driver

BQ7718—Family 2-5S Overvoltage Protector with Internal Delay Timer

BQ2947—Lithium-ion protection for accurate cell-by-cell voltage monitoring

BQ2961—2-4S Overvoltage Protector with LDO Output

Protection/monitoring

The Protector/Monitor/Cell-Balancing is responsible for protecting, monitoring and balancing for 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.

Battery protectors

BQ76200—High-side n-channel FET driver

BQ7718—Family 2-5S Overvoltage Protector with Internal Delay Timer

BQ2947—Lithium-ion protection for accurate cell-by-cell voltage monitoring

BQ2961—2-4S Overvoltage Protector with LDO Output

BQ77207—3-series to 7-series cell Li-ion battery, internal delay timer, voltage and temperature protector

Battery monitors & balancers

BQ76930—6 to 10-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family)

BQ76940—9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)

BQ76907—Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement

BQ76905—Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement

Battery management control unit

The Battery Management Control Unit consists of a Fuel Gauge, which can communicate and control the battery charge/discharge MOSFETs. It also implements the State of Charge (SoC) and State of Health (SoH) of the battery pack and individual battery cells. This sub-system can be configured and the battery pack SoC, SoH can be monitored. Additionally it can implement a communication interface outside of the battery-pack for status monitoring and indication purposes.

Products

Battery fuel gauges

BQ40Z80—2-s to 6-s battery pack manager with Impedance Track™ gas gauging

BQ40Z50-R2—1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0

BQ78350-R1A—CEDV li-ion gas gauge and battery management controller

ESD protection diodes

TPD1E6B06—6pF ±5V ±15kV ESD protection diode in 0201 package

TPD1E10B06—12-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package