MCP1643-I/MC

LED Driver IC Overview

The MCP1643-I/MC is a synchronous boost LED constant current regulator manufactured by Microchip Technology. It operates with an input voltage range of 0.5V to 5V and provides a maximum output current of 550mA. The device utilizes a fixed switching frequency of 1MHz for high efficiency in compact designs. It features PWM dimming capability via the enable pin and supports low startup voltages, making it suitable for single-cell battery applications.

LED Driver IC Feature Summary

• Synchronous step-up converter topology optimized for LED driving
• Supports PWM dimming control through the enable pin
• Low startup voltage operation for single-cell battery compatibility

LED Driver IC Applications

• Portable LED lighting products
• LED flashlights and headlamps
• Rechargeable flashlight systems
• General LED constant current regulation

LED Driver IC Procurement Notes

Verify the specific suffix 'I/MC' to confirm industrial temperature range and DFN-8 package type. Ensure compatibility with 1MHz switching frequency requirements. Confirm that the 550mA output current meets the target LED load specifications. Check datasheet for thermal performance under continuous operation conditions.

LED Driver IC Selection Notes

Select this component when a compact, high-efficiency solution is required for driving LEDs from low-voltage sources. It is appropriate for applications needing precise constant current regulation without external sense resistors. Consider the 1MHz frequency for smaller passive component sizes compared to lower-frequency alternatives.

LED Driver IC Part Context

This part belongs to the MCP164x family of LED drivers from Microchip Technology. It shares functional similarities with the MCP1640 but offers higher output current capabilities and a fixed 1MHz switching frequency. The I/MC designation indicates the industrial temperature grade and surface-mount DFN-8 packaging.

LED Driver IC Replacement Considerations

The MCP1640BT-I/MC is a related device within the same product family. Verify if the lower 350mA output current of the MCP1640 is sufficient for the application. Note that the MCP1640 operates at a different switching frequency (500kHz), which may impact external component selection.