ABLIC launches secondary protection ICs with cascade function

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ABLIC has announced the launch of the S-82K5B/M5B Series, a secondary protection IC for 3 to 5 serially connected cells and the company’s first secondary protection ICs with an integrated cascade function.

These devices reduce the number of components required for monitoring batteries with 6 or more serially connected cells by as much as 30% compared to conventional products.

Secondary protection ICs are used in a wide range of applications which require high voltage such as power tools, vacuum cleaners, and e-bikes, and applications that require a high degree of safety.

Secondary protection ICs are used in combination with protection fuses which blow when an external signal is received. When an overcharge occurs, a signal from the secondary protection IC causes the fuse to blow and break the charging current path to protect connected devices.

Conventional secondary protection ICs can monitor batteries with up to 5 serially connected cells but tend to require a large number of external components to monitor larger numbers of serially connected cells.

The S-82K5B/M5B Series combines a number of features including: a cascade function (a function which enables connection protection of more batteries than the maximum number of batteries that a single protection IC can protect) which makes it possible to carry out voltage monitoring of rechargeable batteries with 6 or more serially connected cells using far fewer components than conventional products, and an open detection circuit which detects communication failures between ICs to enable safer voltage monitoring

A lineup of two products ensures a degree of flexibility with the S-82K5B Series with ±20mV overcharge detection voltage accuracy, and the S-82M5B with what is claimed to be the industry’s highest accuracy of ±15mV.

Going forward, ABLIC said that it would be looking to develop lithium-ion battery protection ICs with even greater accuracy and higher performance and to release products for applications in a wide range of fields.

Key device specifications:

  • A cascade function that allows for monitoring of 6 or more serially connected cells
  • Overcharge detection voltage: 3.50 to 4.70V,

S-82K5B Series: ±20mV (25°C), ±25mV (-10 to 60°C)

S-82M5B Series: ±15mV (25°C), ±20mV (-10 to 60°C)

  • Current consumption during operation: 5μA max.
  • The CO pin output voltage is 7.5V max. so a low gate withstand voltage FET can be used
  • Maximum rating: 28V
  • Operating temperature: -40 to +85°C
  • Packages: TMSOP-8, SNT-8A