HV9921N8-G

Overview

The HV9921N8-G is a single-channel, switch-mode PWM LED lamp driver IC manufactured by Microchip Technology. It utilizes a Buck topology to regulate current for high-voltage LED applications. The device operates within an input voltage range of 20 V to 400 V and delivers a maximum output current of 20 mA. It functions at a switching frequency of 170 kHz with adjustable output voltage capabilities. The component is housed in a SOT-89 package, supports surface mount installation, and maintains power dissipation up to 1.6 W. It operates reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Provides constant current regulation for LED loads using a buck converter architecture
• Integrates internal MOSFET to reduce external component count
• Supports wide input voltage ranges suitable for direct AC/DC conversion applications

Applications

• High-voltage LED lamp drivers
• LED lighting modules requiring constant current sources
• General-purpose LED illumination systems

Procurement Notes

Verify the specific suffix 'N8' confirms the SOT-89 package variant when ordering. Confirm RoHS compliance status through official datasheets or manufacturer declarations prior to integration. Ensure design compatibility with the 170 kHz switching frequency and thermal requirements for the selected enclosure. Cross-reference part numbers carefully as minor suffix changes may indicate different packaging or environmental ratings.

Selection Notes

Select this component for designs requiring a compact, single-channel solution for high-voltage LED strings. The integrated MOSFET simplifies PCB layout compared to discrete solutions. Consider the 20 mA output limit when sizing LED arrays. The SOT-89 package offers a balance between thermal performance and board space efficiency for low-power applications.

Part Context

This part belongs to the HV9921/HV9922/HV9923 family of 3-pin switch-mode LED lamp driver ICs from Microchip Technology. These devices are designed specifically for replacing traditional ballasts in fluorescent fixtures with LED equivalents. The N8 suffix denotes the specific SOT-89 surface-mount package configuration used in this variant.

Replacement Considerations

HV9921N3-G serves as a through-hole alternative in a TO-92-3 package with identical electrical characteristics.