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Intersil Releases New Battery Pack Monitor


New ISL94202 monitors Lithium-Ion Batteries and provides protection together with cell balancing


Intersil has released the ISL94202 3-to-8 cell battery pack monitor that supports lithium-ion (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.

Click for Larger Image - Intersil Releases New Battery Pack Monitor 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 industry's smallest, low-cost 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, which greatly simplifies manufacturing.

“The ISL94202 offers customers all the necessary front end battery features to protect against catastrophic pack failure,” said Philip Chesley, senior vice president of Precision Products at Intersil. “Its innovative high-side FET control, current monitoring and cell measurement delivers a small footprint solution for efficient battery pack designs.”

The ISL94202 battery monitor is pin-compatible with the popular 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.


Key Features of the ISL94202

  • Eight cell voltage monitors support Li-ion CoO2, Li-ion Mn2O4, and Li-ion FePO4 battery chemistries
  • Highest level of integration: cell voltage level shift, automatic cell balance, 14-bit ADC, current sense monitor, power FET control, and temperature sensor interface
  • System output voltage of 2.4V to 18.304V
  • Stand-alone pack control, no microcontroller required
  • Multiple cell voltage protection options up to 4.8V
  • Programmable detection/recovery times for overvoltage, undervoltage, overcurrent and short circuit conditions
  • Configuration/calibration registers stored in EEPROM
  • Open battery connect detection
  • Integrated charge/discharge FET drive circuitry with built-in charge pump supports high-side N-channel FETs
  • Cell balancing uses external FETs with device's internal state machine or external microcontroller
  • Operates over the -40°C to +85°C industrial temperature range
  • Enters low power states when battery pack is not in use

The company's Web site address is www.Intersil.com.
[Reprinted with kind permission from Intersil - Release Date, 13th March, 2017]


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