MP2488DN-LF LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP2488DN-LF is an active-status LED driver IC manufactured by Monolithic Power Systems Inc., designed for step-down (buck) topology DC-DC regulation with PWM dimming capability. This component delivers 2A output current across a 4.5V to 55V supply range, operating at 200kHz frequency with automotive-grade qualification. The part is housed in an 8-SOIC package with exposed pad and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance, dimming methodology, and thermal operating ranges align with application requirements for lighting systems.

Key Parameters

Parameter	MP2488DN-LF
Manufacturer	Monolithic Power Systems Inc.
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	55V
Current - Output / Channel	2A
Frequency	200kHz
Dimming	PWM
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
RoHS Status	ROHS3 Compliant
Grade	Automotive

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Topology: Step-Down (Buck) configuration for direct voltage regulation
Dimming Method: PWM capability for brightness control
Output Current: Minimum 2A to meet or exceed the main part specification
Supply Voltage Range: Overlap with 4.5V to 55V input specification
Operating Temperature: Support for -40°C to 85°C minimum range
Package Type: Surface mount with exposed pad for thermal management
Compliance: ROHS3 and REACH compliance status

Grouping Logic:

Group A - Direct Buck Topology Substitutes (Highest Compatibility): Parts maintaining step-down (buck) topology with PWM dimming and 2A or greater output current capability. These provide the closest functional match to MP2488DN-LF.

Group B - Alternative Topology Substitutes (Conditional Use): Parts utilizing SEPIC or boost topologies with PWM dimming. These require circuit redesign but offer alternative solutions for specific lighting applications with different voltage requirements.

Group C - Lower Current Substitutes (Derating Required): Parts with output current below 2A. These are suitable only when application current demands are reduced.

Parameter Comparison

Part Number	Manufacturer	Topology	Output Current	Supply Min	Supply Max	Frequency	Dimming	Temp Range	Package	RoHS Status
MP2488DN-LF	Monolithic Power Systems Inc.	Step-Down (Buck)	2A	4.5V	55V	200kHz	PWM	-40°C ~ 85°C	8-SOIC-EP	ROHS3
LED2000PUR	STMicroelectronics	Step-Down (Buck)	3A	3V	18V	850kHz	PWM	-40°C ~ 150°C	8-VFQFPN-EP	ROHS3
LM3405AXMK/NOPB	Texas Instruments	Step-Down (Buck)	1A	3V	22V	1.6MHz	PWM	-40°C ~ 125°C	TSOT-23-6	ROHS3
LM3406MHX/NOPB	Texas Instruments	Step-Down (Buck)	1.5A	6V	42V	10kHz ~ 1MHz	PWM	-40°C ~ 125°C	14-HTSSOP	ROHS3
MAX20051AUD/V+T	Analog Devices Inc./Maxim Integrated	Step-Down (Buck)	2A	4.5V	65V	400kHz	Analog, PWM	-40°C ~ 125°C	14-TSSOP-EP	ROHS3
LM3410XSDE/NOPB	Texas Instruments	SEPIC, Step-Up (Boost)	2.8A (Switch)	2.7V	5.5V	1.6MHz	PWM	-40°C ~ 125°C	6-WSON-EP	ROHS3
ISL97634IRT26Z-TK	Renesas Electronics Corporation	SEPIC, Step-Up (Boost)	30mA	2.4V	5.5V	1.45MHz	PWM	-40°C ~ 85°C	8-TDFN-EP	ROHS3
LM3530TMX-40/NOPB	Texas Instruments	Step-Up (Boost)	30mA	2.7V	5.5V	500kHz	PWM	-40°C ~ 85°C	12-DSBGA	ROHS3
LM3530UME-25A/NOPB	Texas Instruments	Step-Up (Boost)	30mA	2.7V	5.5V	500kHz	PWM	-40°C ~ 85°C	12-DSBGA	ROHS3
LT3478EFE#PBF	Analog Devices Inc.	Step-Down (Buck), Step-Up (Boost)	4.5A (Switch)	2.8V	36V	200kHz ~ 2.25MHz	PWM	-40°C ~ 125°C	16-TSSOP-EP	ROHS3
LTC3490ES8#PBF	Analog Devices Inc.	Step-Up (Boost)	350mA	1V	3.2V	1.3MHz	Analog	-40°C ~ 85°C	8-SOIC	ROHS3

Engineering Selection Recommendations

Group A - Recommended Direct Substitutes (Step-Down Buck Topology):

LED2000PUR (STMicroelectronics) provides the closest functional match with 3A output current, exceeding the 2A requirement. Supply voltage range of 3V to 18V overlaps the critical 4.5V to 55V specification at the lower end. Operating temperature extends to 150°C, providing thermal margin. ROHS3 compliance and automotive-grade thermal performance support direct substitution in lighting applications. Package change from 8-SOIC to 8-VFQFPN requires PCB layout modification.

MAX20051AUD/V+T (Analog Devices Inc./Maxim Integrated) matches the 2A output current specification exactly and extends supply voltage to 65V, exceeding the upper limit. Dual dimming capability (Analog and PWM) provides application flexibility. Operating temperature range of -40°C to 125°C exceeds the minimum requirement. ROHS3 compliance and 14-TSSOP package require circuit board redesign. This part is suitable for applications requiring extended temperature performance.

LM3406MHX/NOPB (Texas Instruments) delivers 1.5A output current with supply range of 6V to 42V, partially overlapping the 4.5V minimum specification. Automotive-grade qualification matches the main part. Frequency range of 10kHz to 1MHz provides design flexibility. ROHS3 compliance confirmed. Package change to 14-HTSSOP requires layout modification. Suitable for applications where 1.5A current is sufficient.

Group B - Alternative Topology Substitutes (SEPIC/Boost Topology):

LM3410XSDE/NOPB (Texas Instruments) utilizes SEPIC topology with 2.8A switch current and PWM dimming. Supply range of 2.7V to 5.5V requires circuit redesign for applications exceeding 5.5V input. Output voltage range of 3V to 24V supports backlight applications. ROHS3 compliance and -40°C to 125°C operating range confirmed. Package change to 6-WSON requires layout modification. Suitable only for low-voltage backlight applications.

LT3478EFE#PBF (Analog Devices Inc.) offers dual topology capability (buck and boost) with 4.5A switch current and PWM dimming. Supply range of 2.8V to 36V requires circuit redesign for applications exceeding 36V input. Frequency range of 200kHz to 2.25MHz provides design flexibility. ROHS3 compliance and -40°C to 125°C operating range confirmed. Package change to 16-TSSOP-EP requires significant layout modification. Suitable for applications requiring topology flexibility.

Group C - Lower Current Substitutes (Current Derating Required):

LM3405AXMK/NOPB (Texas Instruments) provides 1A output current, requiring 50% current derating from the 2A specification. Supply range of 3V to 22V partially overlaps the 4.5V minimum. ROHS3 compliance and -40°C to 125°C operating range confirmed. TSOT-23-6 package is significantly smaller, enabling space-constrained designs. Suitable only for applications with reduced current requirements.

ISL97634IRT26Z-TK (Renesas Electronics Corporation), LM3530TMX-40/NOPB, and LM3530UME-25A/NOPB all deliver 30mA output current, requiring 93% current derating. These parts are suitable only for low-power backlight applications and are not recommended for general LED driver substitution.

LTC3490ES8#PBF (Analog Devices Inc.) provides 350mA output current with analog dimming only (no PWM capability). Supply range of 1V to 3.2V is incompatible with the 4.5V minimum specification. Not recommended as a substitute.

Frequently Asked Questions (FAQ)

Q: Can LED2000PUR directly replace MP2488DN-LF without circuit modification?

A: LED2000PUR maintains step-down (buck) topology and PWM dimming, but the package changes from 8-SOIC to 8-VFQFPN. PCB layout modification is required. Supply voltage range of 3V to 18V covers the critical 4.5V to 55V specification only partially. Verify that your application operates within the 3V to 18V input range before substitution.

Q: What is the difference between PWM and Analog dimming?

A: PWM (Pulse Width Modulation) dimming controls brightness by varying the duty cycle of the output signal at a fixed frequency. Analog dimming controls brightness by varying the reference voltage. MP2488DN-LF uses PWM dimming. MAX20051AUD/V+T supports both methods, providing application flexibility. Verify your circuit design supports the dimming method of the substitute part.

Q: Why do some substitute parts have lower output current ratings?

A: Parts in Group C (LM3405AXMK/NOPB, ISL97634IRT26Z-TK, LM3530 series, LTC3490ES8#PBF) are designed for different application categories. LM3405AXMK/NOPB targets space-constrained designs with reduced current requirements. ISL97634IRT26Z-TK and LM3530 series are optimized for backlight applications requiring only 30mA. LTC3490ES8#PBF is designed for ultra-low-voltage boost applications. These parts are not suitable for applications requiring the full 2A output current of MP2488DN-LF.

Q: Can I use a boost topology part (LM3410XSDE/NOPB) instead of a buck topology part (MP2488DN-LF)?

A: Boost topology parts step up voltage, while buck topology parts step down voltage. These topologies serve different application requirements. LM3410XSDE/NOPB is suitable only for applications requiring voltage step-up with input range of 2.7V to 5.5V. If your application requires step-down regulation from 4.5V to 55V input, boost topology parts are not suitable. Verify your circuit topology requirements before substitution.

Q: What does ROHS3 compliance mean?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that the component meets European Union restrictions on hazardous substances, including lead, cadmium, mercury, and certain flame retardants. All listed substitute parts are ROHS3 compliant, matching the main part specification.

Q: Does package size affect substitution compatibility?

A: Yes. Package size changes require PCB layout modification. MP2488DN-LF uses 8-SOIC (0.154", 3.90mm width). LED2000PUR uses 8-VFQFPN (4x4), LM3406MHX/NOPB uses 14-HTSSOP, and MAX20051AUD/V+T uses 14-TSSOP. Smaller packages like TSOT-23-6 (LM3405AXMK/NOPB) enable space-constrained designs but require layout redesign. Verify PCB footprint compatibility before substitution.

Q: What is the significance of the automotive grade specification?

A: Automotive-grade qualification (present in MP2488DN-LF and LM3406MHX/NOPB) indicates the component meets automotive industry standards for reliability, temperature cycling, and environmental stress. If your application requires automotive-grade components, verify that the substitute part carries the same qualification. MAX20051AUD/V+T and LT3478EFE#PBF do not explicitly list automotive grade but support extended temperature ranges suitable for industrial applications.

Q: Can I substitute MP2488DN-LF with MAX20051AUD/V+T for a 55V input application?

A: MAX20051AUD/V+T supports supply voltage up to 65V, exceeding the 55V requirement. However, the package changes from 8-SOIC to 14-TSSOP, requiring PCB redesign. Output current matches at 2A. Verify that your circuit design accommodates the larger package and different pin configuration before substitution.

Q: What does MSL (Moisture Sensitivity Level) mean for component storage?

A: MSL indicates how sensitive the component is to moisture during storage and handling. MP2488DN-LF has MSL 2A (4 weeks), meaning it must be used within 4 weeks of opening the moisture-sealed package. Most substitute parts have MSL 1 (unlimited), providing more flexible storage and handling. Verify MSL requirements for your supply chain and manufacturing processes.

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