Intersil, a subsidiary of Renesas
Electronics announces the ISL94202 3-to-8 cell battery pack monitor that
supports Li-ion and other battery chemistries used in applications such as
vacuum cleaners, lawn equipment, handheld power tools, e-bikes, scooters, toys,
and energy storage systems. Li-ion batteries are smaller, weigh less, and
deliver longer battery life than other battery chemistries, but require
monitoring and protection for safe use. The highly integrated ISL94202 battery
pack monitor enables ultra-small 2-terminal designs, and accurately monitors,
protects and cell balances rechargeable battery packs to ensure safe operation
and charging.


The ISL94202 operates as a
stand-alone battery protection system using an internal state machine with five
pre-programmed modes for accurately balancing and controlling each battery
cell. It monitors and protects the battery pack from catastrophic events such
as hardware faults, short circuit conditions, and cell voltage
overcharge/over-discharge and meets the UL2054, UL2271/72 and IEC62133
specified pack safety requirements. Designers can program the ISL94202 battery
monitor’s protection settings to enable the battery packs without requiring an
external microcontroller. If required, the ISL94202 can also communicate with
an external microcontroller via I2C serial bus to provide additional
fuel gauge measurements, including state of charge and state of health
information. Precise fuel gauge status is provided by the device’s high-side
current measurement feature.





The ISL94202 integrates high-side
charge/discharge FET drive circuitry, which makes it easy to interface to tools
or electric motor equipment. The device also controls external passive cell
balancing switches to ensure good cell energy matching while protecting the
pack’s cell life from chronic undercharging. In addition, the ISL94202 can
withstand factory pack assembly hot plug events.


ISL94203 device that
supports separate charge/ discharge paths for higher-end 3-terminal battery
packs. They are both part of Intersil’s family of industrial battery management
solutions, including the ISL94208 4-to-6 cell
Li-ion battery management analog front end, and ISL94212 Li-ion
battery manager IC, which supervises up to 12 series connected cells, and is
cascadable up to 14 devices or 168 cells. The ISL94202 battery pack monitor is
available now in a 6mm x 6mm, 48-lead QFN package, and is priced at $2.19 USD
in 1k quantities. The ISL94202EVKIT1Z evaluation kit is priced at $328 USD.