MCP1643T-I/MSVAO

LED Driver IC Overview

The MCP1643T-I/MSVAO is a synchronous boost LED constant current regulator from Microchip Technology. It operates at a fixed frequency of 1MHz with a low start-up voltage, optimized for driving one high-power LED or two series-connected red/green/yellow LEDs. The device supports PWM dimming via the enable pin and delivers an output current of 550mA. It functions efficiently from single-cell alkaline, NiMH, or NiCd batteries (1.2V–2.4V) or standard logic supply voltages like 3.3V and 5V. Packaged in an 8-lead MSOP, it ensures reliable performance across industrial temperature ranges.

LED Driver IC Feature Summary

• Synchronous step-up converter architecture for high efficiency
• Fixed 1MHz switching frequency minimizes external component size
• Low start-up voltage enables operation from single-cell battery sources
• Integrated PWM dimming control via the enable pin

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 complete part number including suffixes such as VAO for automotive qualification status when sourcing. Confirm package type is 8-MSOP and check moisture sensitivity levels prior to soldering. Ensure compatibility with your system's input voltage range and thermal requirements. Cross-reference official Microchip documentation for specific ordering codes and availability constraints.

LED Driver IC Selection Notes

Select this component for applications requiring compact, high-efficiency LED driving from low-voltage sources. It is suitable where space constraints limit inductor size due to the 1MHz frequency. Consider its 550mA output capability and PWM dimming interface for brightness control needs. Verify that the load matches the single LED or dual-series LED configuration supported by the internal regulator topology.

LED Driver IC Part Context

This IC belongs to Microchip’s family of LED constant current regulators designed for portable electronics. It complements other drivers by offering synchronous rectification for improved efficiency compared to non-synchronous alternatives. The device targets markets demanding long battery life and small form factors, bridging the gap between simple linear drivers and complex multi-channel controllers.

LED Driver IC Replacement Considerations

Direct substitutes include other MCP1643 variants with different packaging or tape/reel options, such as MCP1643T-I/MS. Check for functional equivalence in terms of current rating, frequency, and package dimensions before swapping components in existing designs.

LED Driver IC FAQ

What is the maximum output current of the MCP1643?

The device provides a regulated output current of 550mA.

How is LED brightness controlled on this regulator?

Brightness is adjusted by applying a variable duty cycle PWM signal to the Enable (EN) pin.

Can this driver power multiple LEDs?

It is optimized for one high-power white LED or two series-connected red, green, or yellow LEDs.