MCP73844-820I/MS

Overview

The MCP73844-820I/MS is a linear charge management controller for single-cell lithium-ion and lithium-polymer batteries. It provides high-accuracy constant-voltage regulation with a maximum error of 0.5% and constant-current control. The device integrates an internal power FET, eliminating the need for external current-sensing components. It features automatic recharge thresholds, cell preconditioning, and advanced safety timers to ensure safe charging operations within a -40°C to +85°C operating temperature range.

Feature Summary

• High-accuracy preset voltage regulation with 0.5% maximum error
• Integrated internal power FET for simplified design
• Advanced safety timers and thermal regulation capabilities
• Automatic recharge function based on voltage drop threshold

Applications

• Portable electronic devices requiring single-cell battery management
• Consumer electronics utilizing lithium-ion or lithium-polymer cells
• Industrial handheld equipment with strict safety timer requirements
• Medical devices needing precise voltage regulation for battery charging

Procurement Notes

Verify the specific suffix '820' indicates the fixed output voltage setting before procurement. Confirm that the 'I' designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure the 'MS' package code matches the required 8-pin MSOP footprint for PCB layout compatibility. Cross-reference the datasheet revision to confirm feature consistency regarding integrated FET specifications.

Selection Notes

Select this component when a compact solution with integrated power switching is required. It is suitable for applications where minimizing external component count is critical. Consider the internal FET current limits against peak load requirements. Verify that the input voltage range supports the system's power supply architecture without exceeding absolute maximum ratings.

Part Context

This part belongs to the MCP7384x family of linear charge management controllers from Microchip Technology. The family includes variants with different voltage settings and package options. The MCP73844 specifically distinguishes itself through its high-accuracy voltage regulation and comprehensive safety features, making it a robust choice for single-cell applications compared to basic chargers lacking precision monitoring.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin-to-pin compatibility with existing designs if considering alternative manufacturers. Check datasheet specifications for equivalent accuracy and safety timer functions before substitution.