MP2681GS

Overview

The MP2681GS-Z is a highly integrated lithium-ion or lithium-polymer switch-mode battery charging controller designed for AC adapter and dock-style charger applications. It operates within a wide input voltage range of 4.5 V to 30 V and supports a maximum output current of 15 mA. The device features constant-current and constant-voltage control with an internal timer for safety backup. It utilizes a 16-pin SOIC package and functions across a temperature range of -40°C to +125°C TJ.

Feature Summary

• Integrates automatic battery cell detection for various configurations including 3S1P, 3S2P, 4S1P, 4S2P, 5S1P, and 5S2P via battery ID resistors.
• Provides comprehensive protection features including battery temperature monitoring, NTC control, charge timeout, and fault control.
• Supports three-stage charging processes: pre-charge, constant-current charge, and constant-voltage charge.

Applications

• AC adapter powered battery chargers
• Dock-style battery charging systems
• Electric tool battery packs

Procurement Notes

Verify the specific suffix (e.g., Z or P) against the official datasheet to ensure correct packaging and environmental compliance. Confirm that the required battery configuration matches the supported ID resistor ranges. Ensure the design accommodates the 16-SOIC thermal requirements and operating temperature limits specified in the manufacturer documentation.

Selection Notes

Select this component when a single-chip solution for multi-cell lithium battery management is required. It is suitable for designs needing automatic cell count detection and robust safety protections without external complex logic. Verify compatibility with the target AC adapter input voltage range and the specific battery chemistry constraints defined in the technical specifications.

Part Context

The MP2681 belongs to the MP2681 series of power management ICs from Monolithic Power Systems. It serves as a specialized charge management controller within the PMIC category, distinct from general-purpose linear or switching regulators. The device integrates reference voltages and status indicators to simplify the design of complete charging systems.

Replacement Considerations

MP2681GS-P is listed as a direct substitute by the manufacturer. Verify pinout and functional equivalence before implementation.

FAQ

How does the MP2681 detect the number of battery cells?

It automatically detects battery cells through battery ID resistors and adjusts the charging voltage accordingly for configurations such as 3S, 4S, or 5S setups.

What safety mechanisms are included in the MP2681?

The device includes an internal charging timer, battery temperature monitoring via NTC, and fault control to prevent overcharging or unsafe conditions.