S-8205A/B Series Applications-Optimized-Battery-Protection Circuits

By Seiko Instruments Gmbh, PRNE
Sunday, December 5, 2010

NEU-ISENBURG, Germany, December 6, 2010 - The introduction of Li-ion-battery-protection IC for 4- or 5 cell battery
packs dedicated to power tools and medical applications is now covering the
range up to 24V. These voltage ranges were until now protectable using
stackable protection IC with high effort in external circuitry. The S-8205A/B
series with 2V..24V supply voltage and absolute maximum rating of 28V
provides this protection as single IC with minimal external circuitry.

A frequently requested feature is a Pin Disconnect Detection. When a
disrupted connection between protection IC and battery pack is detected, the
state of the CO-pin will disable further charging and enhancing of the safety
of Li-ion batteries. The discharge of that battery pack is still possible.

All contained voltage detectors are of high precision between 15mV and
100mV depending on the function. Overcharge detection voltage is 3.55V..4.4V
with 25mV accuracy. Overdischarge detection voltage is 2.0V..3.2V with 80mV
accuracy. Discharge overcurrent detection voltage is 0.05V..0.3V with 15mV
accuracy and charge overcurrent detection voltage is -0.05V..-0.3V with 30mV
accuracy. The detection voltage in short circuit case is 0.5V..1.0V with
100mV accuracy.

The delay times for the Overcharge- Overdischarge- and
Charge-/Discharge-Overcurrent detection can be set with external capacitors.
The delay time for the case of short circuit is internally fixed.

The pins CTLC and CTLD permit external control of charge and discharge.
To protect the battery pack from over temperature damage a temperature sensor
switch IC or for less ambitious applications a PTC connected to the CTLC pin
can perform the task.

    Contact: Paul Krisam, Technical Sales Support Manager, Components
    Seiko Instruments GmbH, Siemensstrasse 9, 63263 Neu-Isenburg, Germany
    Tel.: +49-6102-297-143, Fax.: +49-6102-297-50-143
    Mobile: +49-172-6396-127, eMail : Paul.Krisam@seiko-instruments.de

    Website : www.seiko-instruments.de

Contact: Paul Krisam, Technical Sales Support Manager, Components Department, Seiko Instruments GmbH, Siemensstrasse 9, 63263 Neu-Isenburg, Germany, Tel.: +49-6102-297-143, Fax.: +49-6102-297-50-143, Mobile: +49-172-6396-127, eMail : Paul.Krisam at seiko-instruments.de

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