MM3508B07RRE

Overview

The MM3508B07RRE is a secondary protection integrated circuit designed for battery packs containing two to four cells of lithium-ion or lithium-polymer chemistry. Manufactured by Mitsumi Electric Company Ltd, this component provides essential overcharge and overdischarge protection functions. It utilizes WFDFN-6-EP packaging with an exposed pad to facilitate thermal management and compact board integration. The device operates within standard voltage ranges suitable for multi-cell series configurations, ensuring safe operation by disconnecting the load or charger when predefined voltage thresholds are exceeded.

Feature Summary

• Provides secondary protection against overcharge conditions in multi-cell battery assemblies
• Includes overdischarge protection mechanisms to prevent cell damage
• Designed specifically for lithium-ion and lithium-polymer battery chemistries

Applications

• Protection circuits for 2S to 4S lithium-ion battery packs
• Safety management in portable electronic devices
• Secondary protection stages in consumer electronics power systems

Procurement Notes

Verify the specific datasheet revision and RoHS compliance status (ROHS3 Compliant) prior to ordering. Confirm that the WFDFN-6-EP package footprint matches the design layout. Ensure the application requires secondary rather than primary protection logic. Check for any discontinued status updates from the manufacturer before finalizing procurement plans.

Selection Notes

Select this IC when a dedicated secondary protection layer is required for 2 to 4 series connected lithium cells. It is suitable for designs needing independent overcharge and overdischarge monitoring separate from the primary control loop. Consider the exposed pad thermal requirements during PCB layout. This component is appropriate for cost-sensitive applications requiring reliable battery safety without complex active balancing features.

Part Context

This part belongs to Mitsumi's battery management portfolio, focusing on safety rather than active charging control. It complements primary protection ICs by adding a redundant safety layer. The device is intended for use in finished goods where regulatory compliance and battery longevity are critical. It does not handle charging regulation but focuses solely on fault detection and isolation.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Verify compatibility with existing BMS architecture if considering alternatives. Ensure any replacement supports the same cell count range and voltage thresholds.