MP4008GS LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The MP4008GS is an active LED driver controller IC manufactured by Monolithic Power Systems Inc., designed for boost and SEPIC topology applications. This 8-SOIC surface mount device operates across a 9V to 28V supply range with PWM dimming capability at 180kHz switching frequency. The part is currently in active production status with 1067 units in stock inventory.

Substitute parts are identified when equivalent functional performance can be achieved through alternative topologies, expanded voltage ranges, or enhanced feature sets while maintaining compatibility with the core application requirements of LED driver control.

Substiute Parts

MP4008GS

Monolithic Power Systems Inc.In Stock: 1130MP4008GS Datasheet

Current PartRFQ

LT8391AHUFD#PBF

Analog Devices Inc.In Stock: 856LT8391AHUFD#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LT8391AHUFD#PBF qualifies as a functional substitute based on the following substitution criteria:

Common Functional Parameters:

• Both devices are DC DC controller ICs for LED driver applications
• Both support single output configuration
• Both include PWM dimming capability
• Both are surface mount, active production parts
• Both comply with ROHS3 and REACH standards
• Both operate within overlapping temperature ranges

Substitution Logic: The LT8391AHUFD#PBF extends the supply voltage range (4V to 60V) beyond the MP4008GS specification (9V to 28V), providing broader input compatibility. The substitute supports both buck and boost topologies compared to the MP4008GS boost and SEPIC topologies, offering additional design flexibility. The higher switching frequency (600kHz to 2MHz) and enhanced temperature rating (-40°C to 150°C) represent performance improvements. Package differences (28-QFN versus 8-SOIC) require PCB layout redesign but do not affect functional substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

Both the MP4008GS and LT8391AHUFD#PBF maintain active production status with full ROHS3 compliance and REACH unaffected classification, ensuring regulatory continuity for new designs or production transitions.

The MP4008GS is the primary selection for applications requiring the 8-SOIC package footprint with 9V to 28V input specification and 180kHz fixed frequency operation. This device is optimized for compact board layouts where the smaller package is a design constraint.

The LT8391AHUFD#PBF serves as a substitute when design requirements include expanded input voltage range (4V to 60V), higher switching frequency capability (600kHz to 2MHz), or dual topology support (buck and boost). The 28-QFN package accommodates higher pin count and thermal performance but requires larger board area. The automotive grade rating and superior MSL classification (1 versus 2) provide additional reliability margins for demanding environments.

Selection between these parts depends on specific application voltage requirements, frequency constraints, and available PCB real estate rather than functional capability limitations.

Frequently Asked Questions (FAQ)

Q: Can the LT8391AHUFD#PBF directly replace the MP4008GS without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to package differences (8-SOIC versus 28-QFN) and different pin configurations. Circuit redesign is required, including PCB layout changes and potential adjustments to external component values to accommodate the substitute's different frequency range and topology options.

Q: What are the key compatibility factors when substituting these parts?

A: Compatibility is determined by matching the supply voltage range, output topology requirements, dimming control method (PWM in both cases), and thermal operating range. The MP4008GS operates 9V to 28V; the LT8391AHUFD#PBF operates 4V to 60V. Applications within the 9V to 28V window are compatible with both devices.

Q: Does the higher frequency of the LT8391AHUFD#PBF affect LED driver performance?

A: The LT8391AHUFD#PBF operates at 600kHz to 2MHz versus the MP4008GS at 180kHz. Higher switching frequency typically reduces inductor and capacitor sizes but may require different component selections and PCB layout considerations. Both frequency ranges are standard for LED driver applications.

Q: Are there moisture sensitivity differences between these parts?

A: Yes. The MP4008GS has MSL rating 2 (1 Year storage limit), while the LT8391AHUFD#PBF has MSL rating 1 (Unlimited storage). The substitute offers superior moisture tolerance for long-term inventory management and extended supply chain handling.

Q: Which part is suitable for automotive applications?

A: The LT8391AHUFD#PBF carries an automotive grade designation, making it the specified choice for automotive LED driver implementations. The MP4008GS does not list automotive grading.