MP3398AGS

Overview

The MP3398AGS is a four-channel boost white LED controller designed for LCD panel backlighting. It operates within an input voltage range of 5 V to 28 V and supports a maximum output current of 350 mA per channel. The device utilizes a fixed switching frequency of 540 kHz, adjustable via external resistance. It features independent analog and PWM dimming capabilities with a current matching accuracy of 2.5% across strings. The component is housed in a 16-pin SOIC package and functions without internal switches, driving an external MOSFET.

Feature Summary

• Supports independent analog and PWM dimming modes for flexible brightness control
• Provides comprehensive protection including overcurrent, overtemperature, undervoltage, and open/short circuit detection
• Enables cascading multiple units from a single power supply to expand LED channel capacity

Applications

• Large LCD panel backlight systems
• Television display modules
• Computer monitor backlighting

Procurement Notes

Verify the specific suffix (e.g., -P or -Z) against the required packaging format, as these indicate different reel quantities. Confirm that the SOIC-16 package variant matches the target PCB footprint. Ensure the design accounts for the absence of internal switches by selecting an appropriate external MOSFET. Check humidity sensitivity levels if moisture-prone storage conditions are anticipated.

Selection Notes

Select this controller when designing high-current backlight arrays requiring precise current balancing between parallel LED strings. The fixed 540 kHz frequency simplifies magnetic component selection compared to fully adjustable variants. Consider the thermal performance of the SOIC-16 package relative to the total power dissipation of the four channels. Verify compatibility with the system's dimming interface requirements for both analog and pulse-width modulation signals.

Part Context

This component belongs to the MP3398A family of WLED controllers manufactured by Monolithic Power Systems. The series includes variants such as MP3398AGF and MP3398AGY, which differ primarily in package type, such as TSSOP-EP or SOIC-20. These devices share the core functionality of driving four-channel boost converters for display backlight applications.

Replacement Considerations

MP3398AGS-P serves as a direct substitute with identical electrical characteristics but may differ in reel packaging quantity.