AT9919K7-G

Overview

The AT9919K7-G is a hysteretic buck controller for high-brightness LEDs, operating from 4.5 V to 40 V input. It features high-side current sensing and supports PWM dimming with typical ±5% LED current accuracy. The device operates at up to 2.0 MHz switching frequency and delivers over 90% efficiency. Packaged in an 8-lead WDFN (3x3 mm) suitable for surface mount applications, it meets AEC-Q100 automotive standards.

Feature Summary

• Hysteretic control architecture with high-side current sensing
• Supports analog and PWM dimming methods
• Automotive-grade reliability compliant with AEC-Q100

Applications

• High-brightness LED lighting systems
• Automotive exterior illumination modules
• General-purpose DC-DC step-down LED drivers

Procurement Notes

Verify the specific suffix 'K7' against official Microchip documentation to confirm tape-and-reel packaging quantities and lead-free status. Ensure the component matches the required AEC-Q100 qualification level if used in automotive environments. Cross-reference the datasheet revision date to validate parameter consistency before finalizing procurement orders.

Selection Notes

Select this component for designs requiring simple hysteretic control without external compensation. It is suitable for applications needing wide input voltage ranges up to 40 V. Consider the 8-lead WDFN package constraints for thermal management and PCB layout space when integrating into compact LED driver circuits.

Part Context

This part belongs to Microchip's family of high-brightness LED drivers utilizing hysteretic buck topology. It serves as a dedicated DC-DC controller designed specifically for driving LED loads efficiently. The series emphasizes simplicity and robustness for both industrial and automotive lighting applications.

Replacement Considerations

HV9919BK7-G