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MPQ2483DQ-LF-P LED Driver IC Equivalent & Substitute Parts
Part Overview
The MPQ2483DQ-LF-P is a LED Driver IC with integrated DC-DC regulator functionality, supporting both step-down (buck) and step-up (boost) topologies. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part operates across a wide supply voltage range of 4.5V to 55V and integrates PWM and analog dimming capabilities for backlight and lighting applications. Due to its discontinued status, identifying equivalent and substitute parts is essential for design continuity and component sourcing.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MPQ2483DQ-LF-P |
| Manufacturer | Monolithic Power Systems Inc. |
| Product Category | Power Management (PMIC) |
| Device Type | DC DC Regulator |
| Topology | Step-Down (Buck), Step-Up (Boost) |
| Package Type | 10-QFN (3x3) |
| Supply Voltage Range | 4.5V to 55V |
| Switching Frequency | 1.35MHz |
| Dimming Modes | Analog, PWM |
| Operating Temperature | -40°C to 125°C (TJ) |
| Grade | Automotive |
| Product Status | Not For New Designs |
| RoHS Compliance | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the MPQ2483DQ-LF-P is determined by the following critical parameters:
Primary Substitution Criteria:
- DC-DC regulator topology (buck, boost, or buck-boost)
- Supply voltage range compatibility (minimum 4.5V, maximum 55V)
- Package form factor (10-QFN preferred for pin-compatible replacement)
- Dimming capability (PWM and/or analog support)
- Operating temperature range (-40°C to 125°C minimum)
- Automotive grade qualification
Secondary Considerations:
- Switching frequency (1.35MHz nominal)
- Internal switch integration
- Single output configuration
- RoHS3 compliance
Substitute parts are grouped into three categories: direct parametric equivalents from the same manufacturer with identical electrical specifications, manufacturer-recommended alternatives with active product status, and cross-manufacturer substitutes with compatible topologies and operating parameters.
Parameter Comparison
| Part Number | Manufacturer | Topology | Supply Voltage (Min-Max) | Frequency | Dimming | Package | Temp Range | Status | Grade |
|---|---|---|---|---|---|---|---|---|---|
| MPQ2483DQ-LF-P | MPS | Buck/Boost | 4.5V - 55V | 1.35MHz | Analog, PWM | 10-QFN | -40°C to 125°C | Not For New Designs | Automotive |
| MPQ2483DQ-AEC1-LF-P | MPS | Buck/Boost | 4.5V - 55V | 1.35MHz | Analog, PWM | 10-QFN | -40°C to 125°C | Not For New Designs | Automotive (AEC-Q100) |
| MPQ2483DQ-AEC1-LF-Z | MPS | Buck/Boost | 4.5V - 55V | 1.35MHz | Analog, PWM | 10-QFN | -40°C to 125°C | Not For New Designs | Automotive (AEC-Q100) |
| MPQ2483DQ-LF-Z | MPS | Buck/Boost | 4.5V - 55V | 1.35MHz | Analog, PWM | 10-QFN | -40°C to 125°C | Not For New Designs | Automotive |
| MP2483DQ-LF-P | MPS | Buck/Boost | 4.5V - 55V | 500kHz | Analog, PWM | 10-QFN | -40°C to 85°C | Active | Automotive |
| LT3474IFE#TRPBF | Analog Devices | Buck | 4.6V - 36V | 200kHz - 2MHz | PWM | 16-TSSOP-EP | -40°C to 125°C | Active | Automotive |
| LT3478IFE-1#PBF | Analog Devices | Buck/Boost | 2.8V - 36V | 200kHz - 2.25MHz | PWM | 16-TSSOP-EP | -40°C to 125°C | Active | Not Specified |
| LT3517EFE#PBF | Analog Devices | Buck/Boost | 3V - 30V | 250kHz - 2.5MHz | Analog, PWM | 16-TSSOP-EP | -40°C to 125°C | Active | Not Specified |
| LED5000PHR | STMicroelectronics | Buck/Boost | 5.5V - 48V | 850kHz | PWM | 8-HSOP | -40°C to 125°C | Active | Not Specified |
| IS31BL3508A-STLS2-TR | Lumissil Microsystems | Boost | 2.7V - 5.5V | 1MHz | Analog, PWM | SOT-23-6 | -40°C to 85°C | Active | Not Specified |
| LM3556TMX/NOPB | Texas Instruments | Boost | 2.5V - 5.5V | 4MHz | I2C | 16-DSBGA | -40°C to 85°C | Active | Not Specified |
Engineering Selection Recommendations
Direct Parametric Equivalents (Preferred for Pin-Compatible Replacement):
The MPQ2483DQ-AEC1-LF-P and MPQ2483DQ-AEC1-LF-Z variants are parametric equivalents with identical electrical specifications and package form factor. Both include AEC-Q100 automotive qualification, providing enhanced reliability documentation. The MPQ2483DQ-LF-Z offers the same electrical performance without AEC-Q100 certification. These parts maintain the 10-QFN package, enabling direct PCB layout compatibility.
Manufacturer-Recommended Active Alternative:
The MP2483DQ-LF-P is the manufacturer-recommended successor with active product status. This part maintains the same supply voltage range (4.5V to 55V), package type (10-QFN), and dual topology support. The switching frequency is reduced to 500kHz, and the operating temperature range is limited to -40°C to 85°C (TA). This part is suitable for applications where the lower frequency and reduced temperature range are acceptable.
Cross-Manufacturer Substitutes with Buck-Boost Topology:
The LT3478IFE-1#PBF (Analog Devices) and LT3517EFE#PBF (Analog Devices) provide buck-boost topology with active product status. The LT3478IFE-1#PBF supports a maximum supply voltage of 36V, below the original 55V specification. The LT3517EFE#PBF operates to 30V maximum and includes analog dimming capability. Both require 16-TSSOP-EP package accommodation and are not automotive-graded.
Single-Topology Alternatives:
The LT3474IFE#TRPBF (Analog Devices) provides buck-only topology with automotive grade and active status, suitable for step-down applications only. The LED5000PHR (STMicroelectronics) supports buck-boost topology with active status and operates to 48V maximum, requiring an 8-HSOP package change.
Limited-Voltage-Range Alternatives:
The IS31BL3508A-STLS2-TR (Lumissil) and LM3556TMX/NOPB (Texas Instruments) are boost-only topologies with restricted supply voltage ranges (2.7V to 5.5V and 2.5V to 5.5V respectively). These are suitable only for applications within their voltage specifications and do not support the full 4.5V to 55V range of the original part.
Frequently Asked Questions (FAQ)
Q: Can the MP2483DQ-LF-P directly replace the MPQ2483DQ-LF-P in existing designs?
A: The MP2483DQ-LF-P maintains the same 10-QFN package and supply voltage range, enabling pin-compatible replacement. However, the switching frequency is reduced from 1.35MHz to 500kHz, and the operating temperature range is limited to -40°C to 85°C (TA) versus -40°C to 125°C (TJ). Designs operating at the upper temperature limit or requiring the higher switching frequency must evaluate compatibility.
Q: What is the difference between MPQ2483DQ-LF-P and MPQ2483DQ-AEC1-LF-P?
A: Both parts are parametrically identical with the same electrical specifications, package, and operating temperature range. The MPQ2483DQ-AEC1-LF-P includes AEC-Q100 automotive qualification certification, providing additional reliability and qualification documentation. The suffix "-AEC1" indicates this enhanced qualification level.
Q: Are the Analog Devices LT3474, LT3478, and LT3517 series pin-compatible with the MPQ2483DQ-LF-P?
A: No. These parts use 16-TSSOP-EP packages versus the 10-QFN package of the original part. PCB layout redesign is required. Additionally, the LT3474 supports buck topology only, while the LT3478 and LT3517 support buck-boost but with reduced maximum supply voltages (36V and 30V respectively).
Q: Can I use the IS31BL3508A-STLS2-TR or LM3556TMX/NOPB as substitutes?
A: These parts are boost-only topologies with maximum supply voltages of 5.5V, significantly below the original part's 55V maximum. They are suitable only for applications operating within their voltage specifications and requiring boost functionality exclusively.
Q: What dimming modes are supported across substitute options?
A: The original MPQ2483DQ-LF-P supports both analog and PWM dimming. Direct equivalents (MPQ2483DQ-AEC1 variants) maintain both modes. The MP2483DQ-LF-P successor also supports both modes. Cross-manufacturer alternatives vary: LT3517EFE#PBF supports analog and PWM; LT3478IFE-1#PBF and LED5000PHR support PWM only; IS31BL3508A-STLS2-TR and LM3556TMX/NOPB support analog and PWM or I2C respectively.
Q: Which substitute parts maintain automotive-grade qualification?
A: The MPQ2483DQ-AEC1-LF-P and MPQ2483DQ-AEC1-LF-Z include AEC-Q100 automotive qualification. The MP2483DQ-LF-P and LT3474IFE#TRPBF are automotive-graded. Other cross-manufacturer alternatives do not specify automotive qualification.
Q: What is the impact of switching frequency differences on circuit design?
A: The original part operates at 1.35MHz. The MP2483DQ-LF-P operates at 500kHz, requiring larger output filter components and potentially affecting EMI characteristics. The LT3478IFE-1#PBF and LT3517EFE#PBF operate in the 200kHz to 2.25MHz range with programmable frequency. The LED5000PHR operates at 850kHz. Frequency selection impacts inductor and capacitor sizing and must be evaluated against application requirements.
Q: Are all substitute parts RoHS3 compliant?
A: The original MPQ2483DQ-LF-P and all MPS variants (MP2483DQ-LF-P, MPQ2483DQ-AEC1 series, MPQ2483DQ-LF-Z) are explicitly RoHS3 compliant. The LED5000PHR is RoHS3 compliant. Compliance status for Analog Devices and other manufacturers' parts is not specified in the provided data and must be confirmed with manufacturer documentation.
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