MP3391EF-LF-Z

Overview

The MP3391EF-LF-Z is an 8-channel boost WLED controller from Monolithic Power Systems. It operates with an input voltage range of 9V to 35V and provides a maximum channel current of 80mA. The device utilizes a fixed-frequency current mode architecture with a typical switching frequency of 280kHz. It features 2.5% current matching accuracy between LED strings and supports PWM or DC dimming. The component is housed in a 28-pin TSSOP package and functions within a temperature range of -20°C to +85°C.

Feature Summary

• Eight internal current sources provide precise current balancing across LED strings
• Supports flexible PWM or DC input dimming control methods
• Integrated protection mechanisms include over-temperature shutdown and fault flagging

Applications

• Large LCD panel backlighting systems
• White LED array drivers for display modules
• Portable electronic devices requiring high-brightness backlighting

Procurement Notes

Verify the specific suffix EF against the manufacturer datasheet to confirm the 28-TSSOP package variant. Ensure the design accounts for the specified 9V to 35V input range and thermal requirements for the operating environment. Confirm RoHS compliance status through official documentation before finalizing procurement specifications.

Selection Notes

Select this component when driving eight independent LED strings with high current matching precision is required. The fixed frequency operation simplifies external filter design compared to variable frequency alternatives. Consider the 80mA per channel limit when sizing the LED array for the target application brightness levels.

Part Context

This part belongs to the MP3391 series of WLED controllers designed for display backlighting. It shares architectural similarities with other MPS boost drivers but is distinct in its eight-channel configuration and specific pinout. The series targets applications needing scalable LED drive solutions with integrated protection features.

Replacement Considerations

Check for direct pin-compatible substitutes within the MPS portfolio that offer similar channel counts. Verify if alternative packages such as SOIC-28 variants meet the mechanical constraints of the existing board layout without redesigning the footprint.

FAQ

How is the switching frequency determined?

The switching frequency is set by an external resistor connected to the device.

What is the current matching accuracy between channels?

The device guarantees a current matching accuracy of 2.5% between the LED strings.