S-8261ABZMD-G3ZT2U

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The S-8261ABZMD-G3ZT2U is a battery management system, which is part of a larger range of power management integrated circuits (PMIC) from Renesas. This Integrated Circuit (IC) covers a range of battery management functions including: balancing, monitoring, protection and charging of two series-connected lithium-ion cells.

Balancing of the two series-connected cells is achieved by the S-8261ABZMD-G3ZT2U through the use of a current-based balancing technique. As cells discharge, their voltages will drop at different rates. The S-8261ABZMD-G3ZT2U will detect these differences and attempt to balance the cells by drawing current from the higher voltage cell and grounding it via an internal current-regulator. This will cause the higher-voltage cell to discharge and the voltage of the lower-voltage cell to increase, thereby reducing the cumulative voltage difference between them.

Cell monitoring is handled by the S-8261ABZMD-G3ZT2U through the use of an opto-coupled current limiter and a low-resistance current sense resistor. The current sense resistor detects differences in voltage between the two cells as they discharge. The IC then converts the sensed current into a digital signal, allowing the system to monitor each cell\'s health and performance independently. Additionally, the low-resistance current sense resistor reduces power dissipation and improves overall system accuracy.

Protection of cells against over-charging and short-circuiting is provided by the S-8261ABZMD-G3ZT2U through the integrated current limiters. The limiters detect when current passing through the cells exceeds a set level and will shut off the power supplied to the cells, thereby, preventing them from being damaged. Additionally, the integrated circuit also features a temperature limiter, which shuts off power if the cells become too hot.

The S-8261ABZMD-G3ZT2U can also handle cell charging by detecting charge termination via the integrated current limiters. If the cells reach a charged state, the IC shuts off the power, thus, halting the charging process and providing protection against over-charging. Additionally, the IC also provides fast and slow charge termination options, allowing users to tailor the charging cycles to specific usage scenarios. The charge termination threshold level is programmable, meaning users can easily adjust the amount of charge in the cells.

The S-8261ABZMD-G3ZT2U from Renesas is a Battery Management system that integrates all of the features necessary for safe and efficient cell balancing, monitoring, protection and charging. With its user-programmable features and its opto-coupled current limiter, the S-8261ABZMD-G3ZT2U ensures users will have a reliable and accurate system for maintaining the efficiency and safety of their battery-powered devices.

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