MP4603EF-LF LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4603EF-LF is a Power Management IC (PMIC) manufactured by Monolithic Power Systems, classified as an LED Driver Regulator with integrated PWM dimming capability. This device functions as a DC-DC regulator supporting both Step-Down (Buck) and Step-Up (Boost) topologies with a 2.5A internal switch, designed for backlight and lighting applications. The part is currently in Active product status with 907 units in stock inventory.

Substitute parts are necessary when the MP4603EF-LF becomes unavailable, when alternative packaging or thermal characteristics are required for specific application constraints, or when design modifications necessitate different electrical specifications within the LED driver category.

Substiute Parts

MP4603EF-LF

Monolithic Power SystemsIn Stock: 980MP4603EF-LF Datasheet

Current PartRFQ

AP5725WG-7

Diodes IncorporatedIn Stock: 3916AP5725WG-7 Datasheet

MFR RecommendedRFQ

LM3402MR/NOPB

Texas InstrumentsIn Stock: 2354LM3402MR/NOPB Datasheet

MFR RecommendedRFQ

LM3407MY/NOPB

Texas InstrumentsIn Stock: 4356LM3407MY/NOPB Datasheet

MFR RecommendedRFQ

LT3517HFE#PBF

Linear TechnologyIn Stock: 2467LT3517HFE#PBF Datasheet

MFR RecommendedRFQ

LT3518IUF#PBF

Analog Devices Inc.In Stock: 1486LT3518IUF#PBF Datasheet

MFR RecommendedRFQ

LT3591EDDB#TRPBF

Analog Devices Inc.In Stock: 21752LT3591EDDB#TRPBF Datasheet

MFR RecommendedRFQ

MAX1554ETA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1579MAX1554ETA+T Datasheet

MFR RecommendedRFQ

NCV3066DR2G

onsemiIn Stock: 20401NCV3066DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP4603EF-LF is determined by the following critical parameters:

Primary Substitution Criteria:

• Device Type: DC DC Regulator / LED Driver IC
• Topology: Step-Down (Buck), Step-Up (Boost), or compatible single topology
• Number of Outputs: 1 output channel
• Dimming Capability: PWM and/or Analog dimming support
• Current Rating: Minimum 1.5A switch current (MP4603EF-LF rated at 2.5A)
• Voltage Supply Range: Overlap with 4.5V to 80V input range
• Applications: Backlight and/or Lighting
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant preferred

Secondary Considerations:

• Operating Temperature Range: Extended range (-40°C or lower preferred)
• Package compatibility: Alternative packages acceptable if electrical specifications align
• Product Status: Active status preferred; Obsolete parts noted for reference only

Substitute parts are grouped into two categories based on topology alignment:

Category A - Dual Topology (Buck/Boost): Parts supporting both Step-Down and Step-Up operation, directly compatible with MP4603EF-LF functional requirements. These include LT3517HFE#PBF, LT3518IUF#PBF, and NCV3066DR2G.

Category B - Single Topology (Boost or Buck): Parts supporting either Step-Up or Step-Down operation independently. These provide functional alternatives for applications requiring only one topology. Includes AP5725WG-7, LM3402MR/NOPB, LM3407MY/NOPB, LT3591EDDB#TRPBF, and MAX1554ETA+T.

Parameter Comparison

Engineering Selection Recommendations

Preferred Substitutes (Dual Topology, Active Status, ROHS3 Compliant):

LT3518IUF#PBF and NCV3066DR2G are the primary recommended substitutes. Both support Buck/Boost topology matching the MP4603EF-LF functional architecture. LT3518IUF#PBF provides the closest current rating (2.3A vs. 2.5A) with extended operating temperature range (-40°C to 125°C) and unlimited moisture sensitivity. NCV3066DR2G offers 1.5A switch current with automotive-grade qualification (AEC-Q100) and extended temperature range, suitable for industrial and automotive lighting applications.

Secondary Substitutes (Single Topology, Active Status, ROHS3 Compliant):

For applications requiring only Step-Down (Buck) operation: LM3402MR/NOPB (500mA, 1MHz) or LM3407MY/NOPB (350mA, 300kHz-1MHz) from Texas Instruments provide active, compliant alternatives with extended temperature ranges.

For applications requiring only Step-Up (Boost) operation: MAX1554ETA+T (970mA, Analog/PWM dimming) or LT3591EDDB#TRPBF (500mA, PWM dimming) provide active, compliant alternatives with unlimited moisture sensitivity.

Not Recommended:

LT3517HFE#PBF is classified as Obsolete and does not meet ROHS3 compliance requirements. This part should not be selected for new designs despite its dual-topology capability.

Frequently Asked Questions (FAQ)

Q: Can LT3518IUF#PBF directly replace MP4603EF-LF in existing designs?

A: LT3518IUF#PBF is functionally compatible as a direct substitute. Both devices support Buck/Boost topology, single output, PWM and Analog dimming, and ROHS3 compliance. The primary differences are package type (16-WQFN vs. 16-SOIC) and slightly lower switch current (2.3A vs. 2.5A). PCB layout modifications are required due to package change. Verify that the 2.3A current rating meets application requirements.

Q: What is the difference between Buck and Boost topology substitutes?

A: The MP4603EF-LF supports both Buck (Step-Down) and Boost (Step-Up) operation within a single device. Buck-only substitutes (LM3402MR/NOPB, LM3407MY/NOPB) can only step voltage down. Boost-only substitutes (AP5725WG-7, MAX1554ETA+T, LT3591EDDB#TRPBF) can only step voltage up. Dual-topology substitutes (LT3518IUF#PBF, NCV3066DR2G) support both operations. Select based on your specific application topology requirements.

Q: Why is LT3517HFE#PBF listed if it is Obsolete?

A: LT3517HFE#PBF is included for reference purposes only, as it appears in the manufacturer's substitute list for MP4603EF-LF. However, it is classified as Obsolete and does not meet ROHS3 compliance. It is not recommended for new designs or production applications.

Q: How do package differences affect substitution?

A: The MP4603EF-LF uses 16-SOIC packaging. Substitute parts use alternative packages including 16-WQFN, 8-SOIC, 16-TSSOP, 8-PowerSOIC, 8-HVSSOP, 8-WDFN, 8-WFDFN, and SOT-23-6. Package changes require PCB layout redesign, including different pad patterns, trace routing, and thermal management considerations. Verify that the alternative package meets your thermal and space constraints.

Q: What does ROHS3 compliance mean for this product category?

A: ROHS3 compliance indicates the device meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended active substitutes are ROHS3 compliant. LT3517HFE#PBF is non-compliant and unsuitable for applications requiring regulatory compliance.

Q: Can I use a lower current-rated substitute if my application draws less than 2.5A?

A: Yes, if your application requires less than the substitute's rated switch current, a lower-rated device is acceptable. For example, if your design draws 1.5A maximum, NCV3066DR2G (1.5A rated) or LM3402MR/NOPB (500mA rated) are suitable. However, ensure the substitute's voltage supply range and topology match your application requirements.

Q: What is the significance of Moisture Sensitivity Level (MSL)?

A: MSL indicates how long a component can be stored in ambient conditions before requiring baking before reflow soldering. MP4603EF-LF has MSL 2A (4 weeks). Most substitutes have MSL 1 (Unlimited), meaning they can be stored indefinitely without baking. LM3402MR/NOPB has MSL 3 (168 hours), requiring more frequent baking. Select based on your supply chain and manufacturing processes.

Q: Are there automotive-grade alternatives available?

A: Yes. NCV3066DR2G is automotive-qualified (AEC-Q100) with extended temperature range (-40°C to 125°C), suitable for automotive lighting applications. LT3517HFE#PBF also carries automotive qualification but is Obsolete and non-compliant.