MP3385BGR-Z

Overview

The MP3385BGR-Z is a step-up controller with four regulated LED current channels, designed for driving WLED arrays in LCD panel backlight applications. It features an input voltage range of 4.5V to 33V and supports up to 300mA per string with an 80V absolute maximum rating. The device utilizes a buck topology variant for boost control, operates at a programmable switching frequency between 100kHz and 900kHz, and includes an I2C interface for configuration. It is housed in a QFN-20 package.

Feature Summary

• Integrates four regulated current channels with high matching precision for uniform LED brightness.
• Supports multiple dimming modes including direct PWM, internal fixed frequency PWM, and analog options via I2C or input pulses.
• Includes automatic detection and disabling of unused LED strings during startup to prevent overvoltage.
• Provides comprehensive protection mechanisms such as overcurrent, overtemperature, and overvoltage safeguards.

Applications

• Medium to large LCD panel backlighting
• White LED array drivers
• WLED controller circuits

Procurement Notes

Verify the specific suffix (Z) against the manufacturer's latest documentation to ensure compliance with current environmental standards and pinout configurations. Confirm that the QFN-20 package dimensions align with your PCB footprint requirements. Cross-reference the I2C address settings if integrating into existing systems to avoid communication conflicts. Ensure thermal management solutions are adequate for the expected power dissipation levels under full load conditions.

Selection Notes

Select this component when designing systems requiring precise current matching across multiple LED strings without external resistors. It is suitable for applications needing flexible dimming control through digital interfaces. Consider the input voltage range and output voltage capabilities to ensure compatibility with the power supply and LED forward voltage requirements. Evaluate the thermal performance within the QFN-20 package for the intended operating environment.

Part Context

The MP3385B series represents a family of integrated WLED controllers from Monolithic Power Systems. The MP3385BGR-Z is a specific variant within this lineup, offering four-channel regulation. While the base MP3385 model is noted as not recommended for new designs, the B-series variants continue production. This part belongs to the broader category of PMIC LED drivers focused on display backlighting solutions.

Replacement Considerations

For new designs, consider the MP3385A series as an alternative. Verify electrical compatibility and pinout correspondence before substitution. Check for any differences in I2C command sets or protection thresholds between the B and A series variants to ensure seamless integration.