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MP1518DJ-LF-P LED Driver IC Equivalent & Substitute Parts
Part Overview
The MP1518DJ-LF-P is an active LED driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a single-output DC-DC regulator with Step-Up (Boost) topology, delivering 25V output with 350mA switch current capability. It operates across a 2.5V to 6V supply range and supports both Analog and PWM dimming for backlight applications. The part is packaged in TSOT-23-6 surface mount configuration and maintains ROHS3 compliance with unlimited moisture sensitivity rating.
Substitute parts are necessary when the primary MP1518DJ-LF-P becomes unavailable due to inventory constraints, supply chain disruptions, or end-of-life status changes. Alternative devices must maintain functional equivalence across critical electrical parameters including topology, output voltage, switch current rating, and dimming capability while accommodating packaging and thermal operating range variations.
Substiute Parts
Key Parameters
| Parameter | MP1518DJ-LF-P Specification |
|---|---|
| Manufacturer | Monolithic Power Systems Inc. |
| Product Category | Power Management (PMIC) |
| Type | DC DC Regulator |
| Topology | Step-Up (Boost) |
| Number of Outputs | 1 |
| Voltage Supply Range | 2.5V to 6V |
| Voltage Output | 25V |
| Current Output / Channel | 350mA (Switch) |
| Frequency | 1.3MHz |
| Dimming Capability | Analog, PWM |
| Internal Switch | Yes |
| Package / Case | SOT-23-6 Thin, TSOT-23-6 |
| Operating Temperature | -40°C to 125°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the MP1518DJ-LF-P is determined by strict alignment across the following critical parameters:
Primary Substitution Criteria:
- Topology: Step-Up (Boost) configuration required
- Number of Outputs: Single output only
- Voltage Output: 25V nominal or higher capability
- Current Output / Channel: Minimum 350mA switch current
- Dimming Support: Analog and/or PWM dimming capability
- Internal Switch: Integrated switch required
- Supply Voltage Range: Minimum 2.5V lower bound; maximum 6V upper bound or higher
Secondary Compatibility Factors:
- Package / Case: SOT-23-6 or equivalent small-form-factor surface mount packages
- Operating Temperature: -40°C minimum; 125°C maximum or higher
- RoHS Compliance: ROHS3 or equivalent environmental standard
- Moisture Sensitivity: MSL 1 or MSL 3 acceptable for standard applications
Substitutes are grouped into two categories: parametric equivalents (identical base part number with different packaging designators) and manufacturer-recommended alternatives (functionally equivalent devices from different manufacturers meeting the core electrical specifications).
Parameter Comparison
| Parameter | MP1518DJ-LF-P | MP1518DJ-LF-Z | LT3491ESC8#TRMPBF | LT1937ES5#TRMPBF | AP5724WG-7 |
|---|---|---|---|---|---|
| Manufacturer | MPS | MPS | ADI | ADI | Diodes Inc. |
| Topology | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) |
| Voltage Supply (Min) | 2.5V | 2.5V | 2.5V | 2.5V | 2.7V |
| Voltage Supply (Max) | 6V | 6V | 12V | 10V | 5.5V |
| Voltage Output | 25V | 25V | Not Specified | 36V | Not Specified |
| Current Output / Channel | 350mA (Switch) | 350mA (Switch) | 350mA (Switch) | 320mA (Switch) | 750mA (Switch) |
| Frequency | 1.3MHz | 1.3MHz | 2.3MHz | 1.2MHz | 1.2MHz |
| Dimming | Analog, PWM | Analog, PWM | PWM | Analog, PWM | PWM |
| Package / Case | SOT-23-6 Thin | SOT-23-6 Thin | 8-VFSOP | SOT-23-5 Thin | SOT-23-6 |
| Operating Temperature | -40°C to 125°C (TJ) | -40°C to 125°C (TJ) | -40°C to 85°C (TA) | -40°C to 85°C (TA) | -40°C to 85°C (TA) |
| RoHS Status | ROHS3 | ROHS3 | ROHS3 | ROHS3 | ROHS3 |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Tier 1 - Direct Parametric Equivalent: MP1518DJ-LF-P and MP1518DJ-LF-Z are functionally identical devices differing only in packaging designation. Both maintain identical electrical specifications, operating ranges, and compliance certifications. MP1518DJ-LF-Z offers significantly higher inventory availability (57,868 units versus 659 units) and represents the optimal substitution choice when supply constraints affect the primary part number.
Tier 2 - Functional Equivalents with Minor Deviations: LT3491ESC8#TRMPBF (Analog Devices Inc.) matches the MP1518DJ-LF-P across topology, supply voltage minimum, switch current rating, and dimming capability. This device operates at higher frequency (2.3MHz versus 1.3MHz) and supports extended supply voltage to 12V. Operating temperature range is reduced to -40°C to 85°C. Package format differs (8-VFSOP versus SOT-23-6), requiring PCB layout modification. Product status is Active with ROHS3 compliance.
LT1937ES5#TRMPBF (Analog Devices Inc.) provides Step-Up topology with Analog and PWM dimming support across 2.5V to 10V supply range. Switch current is 320mA (slightly below 350mA specification). Output voltage capability reaches 36V. Operating temperature is -40°C to 85°C. Package is SOT-23-5 Thin, requiring pin-count verification. Product status is Active with ROHS3 compliance.
AP5724WG-7 (Diodes Incorporated) delivers Step-Up topology with 750mA switch current, exceeding the MP1518DJ-LF-P rating. Supply range is 2.7V to 5.5V with PWM dimming only (no Analog dimming). Operating temperature is -40°C to 85°C. Package is SOT-23-6, maintaining form-factor compatibility. Product status is Active with ROHS3 compliance.
Tier 3 - Alternative Topologies (Not Recommended for Direct Substitution): A6213KLJTR-T (Allegro MicroSystems), LT3474IFE-1#PBF, LT3478IFE#PBF, and LT3518EFE#PBF employ Step-Down (Buck) or mixed Buck-Boost topologies. These devices are not suitable for direct substitution due to fundamental topology differences, despite sharing LED driver classification and backlight application focus.
CAT4137TD-GT3 (onsemi) operates at reduced current output (30mA versus 350mA) and is classified as Last Time Buy, indicating end-of-life status. This device is not recommended for new designs.
LM3530UMX-25A/NOPB (Texas Instruments) supports 30mA output current, below the 350mA requirement, and is not suitable for this application.
Frequently Asked Questions (FAQ)
Q: Can MP1518DJ-LF-Z be used as a direct replacement for MP1518DJ-LF-P? A: Yes. Both devices share identical electrical specifications, topology, operating ranges, and compliance certifications. The suffix designator indicates packaging variation only. MP1518DJ-LF-Z is a direct parametric equivalent with superior inventory availability.
Q: What is the primary difference between MP1518DJ-LF-P and LT3491ESC8#TRMPBF? A: Both devices employ Step-Up topology with 350mA switch current and support PWM dimming. Key differences include: LT3491ESC8#TRMPBF operates at 2.3MHz (versus 1.3MHz), supports supply voltage to 12V (versus 6V maximum), and uses 8-VFSOP package (versus SOT-23-6). Operating temperature maximum is reduced to 85°C. PCB layout modification is required due to package change.
Q: Why is AP5724WG-7 not a complete substitute despite matching package format? A: AP5724WG-7 provides higher switch current (750mA) and maintains SOT-23-6 packaging, but supports PWM dimming only. The MP1518DJ-LF-P requires Analog and PWM dimming capability. If the application uses PWM dimming exclusively, AP5724WG-7 is acceptable. Supply voltage range is also slightly narrower (2.7V to 5.5V versus 2.5V to 6V).
Q: Can Step-Down (Buck) topology devices substitute for the MP1518DJ-LF-P? A: No. Step-Down topology reduces voltage from input to output, while Step-Up topology increases voltage. The MP1518DJ-LF-P converts 2.5V to 6V input to 25V output. Buck-topology devices cannot achieve this voltage elevation and are not suitable for this application.
Q: What packaging considerations apply when selecting LT1937ES5#TRMPBF? A: LT1937ES5#TRMPBF uses SOT-23-5 package (5 pins) versus MP1518DJ-LF-P SOT-23-6 (6 pins). Pin count and pinout differ, requiring schematic and PCB layout verification before implementation. Consult device datasheets to confirm functional pin mapping.
Q: Are all listed substitutes ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the environmental standard of the MP1518DJ-LF-P. Moisture sensitivity levels are MSL 1 (Unlimited) for all recommended substitutes, ensuring compatibility with standard storage and handling procedures.
Q: What is the inventory status consideration for substitute selection? A: MP1518DJ-LF-Z offers 57,868 units in stock versus 659 units for MP1518DJ-LF-P, providing superior supply chain security. For applications requiring immediate availability, MP1518DJ-LF-Z is the preferred choice. Alternative manufacturers (LT3491ESC8#TRMPBF, LT1937ES5#TRMPBF, AP5724WG-7) offer varying inventory levels (1,886 to 6,800 units) with different lead times and supply reliability profiles.
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