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MP2489DJ-LF-P LED Driver IC Equivalent & Substitute Parts
Part Overview
The MP2489DJ-LF-P is an active LED Driver IC manufactured by Monolithic Power Systems, designed for step-down (buck) topology DC-DC regulation with 1A output current capability. This device operates across a 6V to 60V supply range and features analog and PWM dimming control, making it suitable for backlight, lighting, and signage applications. The part is housed in a TSOT-23-5 surface mount package and carries automotive-grade qualification with ROHS3 compliance.
Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter ranges while accommodating different packaging, topology, or current output requirements for specific application constraints.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Monolithic Power Systems |
| Part Number | MP2489DJ-LF-P |
| Product Type | DC DC Regulator (LED Driver IC) |
| Topology | Step-Down (Buck) |
| Supply Voltage Range | 6V to 60V |
| Output Current | 1A |
| Switching Frequency | 600kHz |
| Dimming Control | Analog, PWM |
| Package Type | TSOT-23-5 |
| Operating Temperature | -40°C to 125°C (TJ) |
| Grade | Automotive |
| Compliance | ROHS3, REACH Unaffected |
Substitute Part Grouping Explanation
Substitute parts are classified into two categories based on substitution criteria:
Category 1: Parametric Equivalents (Identical Electrical & Mechanical Specifications)
- Same topology (step-down buck)
- Identical supply voltage range (6V to 60V)
- Identical output current (1A)
- Identical package (TSOT-23-5)
- Identical dimming control (Analog, PWM)
- Identical operating temperature range (-40°C to 125°C)
- Identical automotive grade and compliance status
Category 2: Functional Alternatives (Different Topology, Package, or Current Rating)
- Alternative topologies (step-up boost, buck-boost)
- Different package types (8-SOIC, 8-VSSOP, 8-HVSSOP, 16-TSSOP, 28-QFN, 12-DSBGA)
- Different output current ratings (350mA, 500mA, 700mA, 2A, 4.5A, 30mA)
- Different supply voltage ranges
- Different switching frequencies
- Suitable for applications where package constraints or current requirements differ from the original specification
Parameter Comparison
| Part Number | Manufacturer | Topology | Supply Voltage (Min-Max) | Output Current | Frequency | Dimming | Package | Temp Range | Grade |
|---|---|---|---|---|---|---|---|---|---|
| MP2489DJ-LF-P | Monolithic Power Systems | Step-Down (Buck) | 6V - 60V | 1A | 600kHz | Analog, PWM | TSOT-23-5 | -40°C to 125°C | Automotive |
| MP2489DJ-LF-Z | Monolithic Power Systems Inc. | Step-Down (Buck) | 6V - 60V | 1A | 600kHz | Analog, PWM | TSOT-23-5 | -40°C to 125°C | Automotive |
| LM3402HVMMX/NOPB | Texas Instruments | Step-Down (Buck) | 6V - 75V | 500mA | 1MHz | PWM | 8-VSSOP | -40°C to 125°C | Not Specified |
| LM3404MAX/NOPB | Texas Instruments | Step-Down (Buck) | 6V - 42V | 1A | 1MHz | PWM | 8-SOIC | -40°C to 125°C | Automotive |
| LM3405AXMKE/NOPB | Texas Instruments | Step-Down (Buck) | 3V - 22V | 1A | 1.6MHz | PWM | TSOT-23-6 | -40°C to 125°C | Not Specified |
| LM3407MYX/NOPB | Texas Instruments | Step-Down (Buck) | 4.5V - 30V | 350mA | 300kHz - 1MHz | PWM | 8-HVSSOP | -40°C to 125°C | Not Specified |
| LM2703MFX-ADJ/NOPB | Texas Instruments | Step-Up (Boost) | 2.2V - 7V | 350mA (Switch) | Not Specified | Not Specified | SOT-23-5 | -40°C to 125°C | Not Specified |
| LM3530UMX-40B/NOPB | Texas Instruments | Step-Up (Boost) | 2.7V - 5.5V | 30mA | 500kHz | PWM | 12-DSBGA | -40°C to 85°C | Not Specified |
| LT3478EFE-1#PBF | Analog Devices Inc. | Step-Down (Buck), Step-Up (Boost) | 2.8V - 36V | 4.5A (Switch) | 200kHz - 2.25MHz | PWM | 16-TSSOP-EP | -40°C to 125°C | Not Specified |
| LT3932IUFD#TRPBF | Analog Devices Inc. | Step-Down (Buck) | 3.6V - 36V | 2A | 200kHz - 2MHz | Analog, PWM | 28-QFN (4x5) | -40°C to 125°C | Automotive |
| MAX16832CASA+T | Analog Devices Inc./Maxim Integrated | Step-Down (Buck) | 6.5V - 65V | 700mA | 2MHz | PWM | 8-SOIC-EP | -40°C to 125°C | Not Specified |
Engineering Selection Recommendations
Direct Parametric Equivalent: MP2489DJ-LF-Z is the direct parametric equivalent, differing only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both parts maintain identical electrical specifications, topology, and automotive-grade qualification. Selection between these two depends solely on packaging and supply chain requirements.
Automotive-Grade Alternatives with Maintained Compliance: LM3404MAX/NOPB and LT3932IUFD#TRPBF both carry automotive-grade qualification and ROHS3 compliance matching the original part. LM3404MAX/NOPB provides 1A output current in an 8-SOIC package with a reduced maximum supply voltage of 42V. LT3932IUFD#TRPBF offers 2A output current in a 28-QFN package with a reduced maximum supply voltage of 36V but includes analog dimming capability alongside PWM control.
Functional Alternatives for Specific Application Constraints: Parts with different topologies, packages, or current ratings are suitable when application requirements diverge from the original specification. LM3402HVMMX/NOPB extends the maximum supply voltage to 75V but reduces output current to 500mA and requires an 8-VSSOP package. LT3478EFE-1#PBF provides buck-boost topology with 4.5A switch current capability in a 16-TSSOP package, suitable for applications requiring flexible input-output voltage relationships. MAX16832CASA+T operates at higher switching frequency (2MHz) with 700mA output current in an 8-SOIC package.
All substitute parts maintain ROHS3 compliance and REACH unaffected status. Selection should be based on specific application requirements regarding supply voltage range, output current capacity, package constraints, and thermal management needs.
Frequently Asked Questions (FAQ)
Q: Can MP2489DJ-LF-Z be used as a direct replacement for MP2489DJ-LF-P? A: Yes. MP2489DJ-LF-Z is a parametric equivalent with identical electrical specifications, topology, and automotive qualification. The only difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Substitution is valid for all applications where the original part is specified.
Q: What is the primary difference between the MP2489DJ-LF-P and LM3404MAX/NOPB? A: Both are step-down buck regulators with 1A output current and automotive-grade qualification. The LM3404MAX/NOPB has a lower maximum supply voltage (42V versus 60V) and uses an 8-SOIC package instead of TSOT-23-5. It is suitable for applications where the 42V maximum is sufficient and package size is not a constraint.
Q: Why would LT3478EFE-1#PBF be selected over the MP2489DJ-LF-P? A: LT3478EFE-1#PBF provides buck-boost topology, allowing it to operate with input voltages both above and below the output voltage. It also offers significantly higher switch current (4.5A) and wider frequency range (200kHz to 2.25MHz). Selection depends on application requirements for flexible voltage conversion and higher current handling.
Q: Is LM3530UMX-40B/NOPB suitable as a substitute? A: LM3530UMX-40B/NOPB is a step-up (boost) topology with only 30mA output current and operates at lower supply voltages (2.7V to 5.5V). It is not suitable for applications requiring 1A output current or higher input voltage ranges. It is appropriate only for low-power backlight applications with different voltage requirements.
Q: What compliance certifications are maintained across all substitute parts? A: All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original MP2489DJ-LF-P specification. Automotive-grade qualification is explicitly maintained in MP2489DJ-LF-Z, LM3404MAX/NOPB, and LT3932IUFD#TRPBF.
Q: How does package selection affect substitution decisions? A: Package type affects board layout, thermal management, and assembly compatibility. TSOT-23-5 (original) is the smallest package. Alternatives include 8-SOIC, 8-VSSOP, 8-HVSSOP (larger but with better thermal performance), 16-TSSOP, 28-QFN, and 12-DSBGA. Package selection must align with PCB design constraints and thermal requirements.
Q: Can parts with different output current ratings be substituted? A: Substitution is valid only when the application's actual current requirement is less than or equal to the substitute part's rated output current. A part rated for 500mA cannot replace a 1A requirement. Conversely, a 2A-rated part can replace a 1A requirement if other parameters align and package constraints are acceptable.
Q: What is the significance of dimming control differences? A: The MP2489DJ-LF-P supports both analog and PWM dimming. Substitutes supporting only PWM dimming (LM3402HVMMX/NOPB, LM3404MAX/NOPB, LM3407MYX/NOPB, LM3530UMX-40B/NOPB, LT3478EFE-1#PBF, MAX16832CASA+T) are suitable only if the application uses PWM dimming exclusively. LT3932IUFD#TRPBF maintains both analog and PWM dimming capability.
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