MCP1643-I/MSVAO

LED Driver IC Overview

The MCP1643-I/MSVAO is a synchronous boost LED constant current regulator manufactured by Microchip Technology. It operates with an input voltage range of 0.65 V to 5 V and delivers a maximum output current of 550 mA. The device features a fixed switching frequency of 1 MHz and a low quiescent current of 1.2 µA. It supports PWM dimming and functions within an operating temperature range of -40°C to +85°C. The component is housed in an 8-lead MSOP package.

LED Driver IC Feature Summary

• Synchronous step-up architecture for high efficiency
• Constant current regulation for LED driving
• Supports PWM dimming control
• Low start-up voltage capability

LED Driver IC Applications

• One-cell alkaline portable LED lighting
• Two-cell NiMH/NiCd portable LED lighting
• LED flashlights

LED Driver IC Procurement Notes

Verify the specific suffix VAO against official Microchip documentation to confirm RoHS compliance and packaging details. Ensure the MSOP package variant matches the required board layout. Cross-reference the full part number with authorized distributors to confirm availability and authenticity, as supply chain variations may exist for different regional designations.

LED Driver IC Selection Notes

Select this component when designing compact, battery-powered LED systems requiring high efficiency from single or dual-cell sources. The 1 MHz switching frequency allows for smaller external inductors and capacitors compared to lower-frequency alternatives. Ensure the application demands a constant current source suitable for the specified 550 mA maximum output limit.

LED Driver IC Part Context

This part belongs to the MCP1643 family of synchronous boost converters designed specifically for LED applications. It integrates the power switch and control logic into a small footprint, reducing the need for external components. The series is optimized for portable consumer electronics where space and battery life are critical constraints.

LED Driver IC Replacement Considerations

Consult Microchip's official cross-reference tools for verified substitutes. Generic equivalents may differ in thermal performance or pinout compatibility. Verify that any replacement maintains the same synchronous topology and input voltage range to ensure circuit stability.