MP3378GY

Overview

The MP3378GY is a Monolithic Power Systems integrated circuit designed for monitor backlighting applications. It combines a 4-channel WLED controller with a high-efficiency synchronous buck converter. The WLED section drives external MOSFETs to boost input voltage, regulating current in four LED strings up to 350 mA each with 2.5% matching accuracy. It supports analog and PWM dimming. The integrated buck converter features low Rds(on) internal MOSFETs (144 mΩ/58 mΩ), operates at a fixed 235 kHz frequency, and offers output adjustment from 0.8 V. Input voltage range extends up to 24 V.

Feature Summary

• Integrates a 4-string WLED controller with independent analog and PWM dimming capabilities for precise backlight regulation.
• Includes a high-efficiency synchronous buck converter with built-in power MOSFETs for internal bus voltage generation.
• Provides comprehensive protection mechanisms including over-current, thermal shutdown, open/short LED detection, and recoverable fault handling.

Applications

• Monitor LCD backlight systems
• Multi-string white LED driving
• Internal power supply generation for display controllers

Procurement Notes

Verify the specific suffix 'GY' corresponds to the TSSOP28EP package variant when ordering. Confirm RoHS compliance status as indicated by the 'Z' suffix in related part numbers like MP3378GY-Z. Ensure the application design accounts for the 24 V maximum input voltage limit. Cross-reference the manufacturer's latest datasheet for any updates on pinout or electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring a single-chip solution for both backlight control and auxiliary power generation. The 4-channel architecture simplifies board space compared to discrete solutions. Consider the 2.5% current matching accuracy for uniformity requirements. The inclusion of a synchronous buck converter reduces external component count. Evaluate the 235 kHz switching frequency against EMI constraints in the target enclosure.

Part Context

The MP3378GY belongs to the MP3378 family of LED lighting driver ICs from Monolithic Power Systems. This family includes variants such as MP3378GF and MP3378GY with different package options like SOIC28 and TSSOP28EP. These devices are engineered specifically for monitor applications, offering a compact alternative to multi-component backlight drivers while maintaining high efficiency and robust protection features.

Replacement Considerations

Direct substitutes within the same family include MP3378GF and MP3378GY-P. Verify package compatibility, as the GF variant may use SOIC28 while GY uses TSSOP28EP. Ensure functional equivalence regarding the 4-channel WLED control and integrated buck converter specifications before swapping parts.