MCP1643T-I/MC

LED Driver IC Overview

The MCP1643T-I/MC is a synchronous step-up DC-DC converter optimized for LED driving applications. It operates with an input voltage range of 0.65 V to 5 V and delivers up to 550 mA output current. The device features a fixed switching frequency of 1 MHz, enabling the use of compact external components. It includes low start-up voltage capabilities and supports PWM dimming via the enable pin. Packaged in an 8-pin DFN, it is designed for high-efficiency power management in portable battery-powered systems.

LED Driver IC Feature Summary

• Synchronous boost topology for high efficiency
• Fixed 1 MHz switching frequency
• Low start-up voltage operation
• PWM dimming control capability

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' corresponds to the industrial temperature range and 8-lead DFN package configuration. Confirm that the 1 MHz frequency specification aligns with your passive component selection constraints. Ensure compatibility with the intended battery cell chemistry, as the low start-up voltage is critical for single-cell alkaline or NiMH/NiCd applications. Cross-reference the datasheet revision date to ensure all electrical characteristics match your design requirements.

LED Driver IC Selection Notes

Select this component when a compact solution for driving white LEDs from single or dual-cell batteries is required. The 1 MHz frequency allows for smaller inductors and capacitors compared to lower-frequency alternatives. Consider the 550 mA current limit for LED brightness requirements. The synchronous design improves efficiency over diode-based rectification, extending battery life in portable devices where space and power consumption are primary constraints.

LED Driver IC Part Context

This part belongs to Microchip's MCP164x family of synchronous boost converters. These devices are specifically engineered for LED driver applications, offering integrated current regulation and protection features. The family shares common architectural benefits such as low quiescent current and small footprint packages, making them suitable for space-constrained consumer electronics and portable instrumentation.

LED Driver IC Replacement Considerations

Check for direct pin-compatible substitutes within the MCP164x series, such as the MCP1640 or MCP1642, noting differences in switching frequency and current limits. Verify if alternative manufacturers offer similar 1 MHz synchronous boost regulators with comparable input voltage ranges and DFN packaging.