MP4689AGN

Overview

The MP4689AGN is a high-voltage buck LED driver IC from Monolithic Power Systems. It operates with an input voltage range of 4.5 V to 100 V and delivers up to 1 A of constant current output. The device utilizes a buck topology with a fixed switching frequency of 1 MHz. It features hysteresis current mode control, eliminating the need for compensation networks or output capacitors. The unit provides ±3% LED current accuracy and includes integrated protection mechanisms such as short circuit protection and thermal shutdown. It is housed in an SOIC-8 package.

Feature Summary

• Hysteresis current mode control enables fast response without external compensation
• Integrated high-side MOSFET with short circuit and thermal protection
• Dedicated PWM dimming input supports frequencies up to 20 kHz
• Eliminates the need for output capacitors in the design

Applications

• High-power LED lighting systems
• Automotive exterior lighting applications
• Industrial lighting fixtures
• General purpose LED drivers

Procurement Notes

Verify the specific suffix (e.g., AGN-P vs AGN-Z) against the official datasheet to confirm packaging format and compliance status. Confirm that the component designation matches the active part number, as older revisions may carry different ordering codes. Ensure the selected variant aligns with the required lead time and moisture sensitivity level for the assembly process.

Selection Notes

Select this component for designs requiring wide input voltage ranges up to 100 V without complex compensation loops. The 1 MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the SOIC-8 package size and thermal dissipation capabilities when determining board layout requirements for the intended power levels.

Part Context

The MP4689 series belongs to Monolithic Power Systems' portfolio of high-voltage LED drivers. This specific model represents a buck converter solution designed for single-channel constant current regulation. It is engineered to simplify high-voltage LED driving by integrating power switches and protection features into a compact surface-mount package.

Replacement Considerations

Official documentation identifies the MP4689A as the recommended alternative for new designs. Verify compatibility with existing footprints and electrical specifications before substituting.