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Monolithic Power Systems Inc. MP2489DQ-LF-Z
- Part No.:
- MP2489DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
MP2489DQ-LF-Z.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 6QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MP2489DQ-LF-Z from Monolithic Power Systems is a high-efficiency step-down white LED driver IC with 6V–60V input range, integrated 65V MOSFET, and hysteretic control architecture. It regulates LED current via external high-side sense resistor (202mV feedback reference), supports ≥1A output, and delivers >95% efficiency in QFN6 (3×3mm) package for automotive and signage lighting.
For engineers reviewing the MP2489DQ-LF-Z datasheet, MP2489DQ-LF-Z pinout, MP2489DQ-LF-Z application, or MP2489DQ-LF-Z equivalent, key selection factors include its 1000:1 PWM dimming resolution, inherent open/short LED protection, thermal shutdown, and dual analog/PWM dimming capability on a single EN/DIM pin.
Technical Context
The MP2489DQ-LF-Z implements a fixed-frequency hysteretic control scheme-no loop compensation required-enabling sub-microsecond transient response and stable regulation across wide input (6–60V) and load conditions. Its internal 1.275V reference sets both enable threshold and current-sense reference scaling.
LED current is regulated by maintaining 202mV ±30mV across the external RS resistor; dimming is implemented via voltage-controlled analog mode (0.3–2.5V) or externally applied PWM (0.1–2kHz) on the shared EN/DIM pin, with soft-start programmable via external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - enables direct operation from 12V/24V/48V industrial and automotive supplies without pre-regulation. |
| Max Output Current | ≥1A - supports high-brightness LED strings up to 3–5 LEDs in series at full brightness. |
| Feedback Reference Voltage | 202mV ±30mV - low sensing voltage minimizes I²R loss in current-sense resistor and improves system efficiency. |
| Dimming Interface | PWM + Analog on single EN/DIM pin - eliminates need for separate control lines; 1000:1 PWM resolution enables precise brightness grading. |
| Thermal Protection | Integrated thermal shutdown at 150°C junction - prevents permanent damage during overloads or poor heatsinking in enclosed fixtures. |
| Package | QFN6 (3×3mm) with exposed thermal pad - provides 50°C/W θJA (4-layer PCB), enabling compact, thermally robust LED driver designs. |
| Switch RDS(on) | 0.5Ω - low conduction loss supports high efficiency (>95%) even at 1A continuous output. |
Pinout & Package
MP2489DQ-LF-Z is housed in a thermally enhanced QFN6 (3mm × 3mm) package with exposed pad soldered to PCB ground plane for optimal heat dissipation. Pin numbering follows JEDEC MO-229 VEEA-2 standard; Pin 1 is marked by index area on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Drain of internal 65V MOSFET | Connects to inductor and Schottky diode anode; carries high-frequency switching current and must be routed with minimal loop area. |
| 2,5 (GND) | Power and signal ground | Dual GND pins reduce impedance; exposed pad must be connected to solid ground plane for thermal and EMI performance. |
| 3 (EN/DIM) | Enable/dimming command input | Accepts 0.3–2.5V DC for analog dimming or 0.1–2kHz square wave for PWM; internal 45kΩ pull-up enables auto-start when floating. |
| 4 (RS) | High-side current sense input | Connects to one end of external sense resistor; referenced to IN, not GND-enables accurate current regulation independent of LED cathode voltage. |
| 6 (IN) | Input supply pin | Accepts 6–60V; requires local 10–22µF low-ESR ceramic capacitor to suppress switching noise and supply surge currents. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation components and delivers <1µs load transient response without stability tuning. |
| Inherent open LED protection | Automatically disables switching if RS pin detects no current flow-prevents overvoltage stress on LED string and driver. |
| Short LED protection | Shuts down output if RS voltage exceeds safe threshold during LED short condition-protects MOSFET and inductor. |
| 1000:1 PWM dimming resolution | Enables smooth, flicker-free brightness control down to 0.1% duty cycle-critical for architectural and emergency lighting compliance. |
| Thermal overload protection | Internal sensor triggers shutdown at 150°C junction temperature and resumes operation after cooldown-ensures reliability in sealed enclosures. |
Applications
| Automotive Exterior Lighting | Emergency Exit Signage |
|---|---|
|
Use Scenario: Driving 3–5 white LEDs in truck side markers or license plate lamps powered directly from 12V/24V battery with load dump tolerance. IC Role / Device Role / Timing Role: Step-down LED current regulator with integrated 65V switch and open-circuit protection-replaces discrete buck controllers and external FETs. Use Value: Eliminates need for input pre-regulator; 60V absolute max rating withstands ISO 7637-2 pulse 5a (±75V); QFN6 footprint saves board space in tight lamp housings. |
Use Scenario: Powering red/green LED arrays in UL 924-compliant exit signs operating from 120VAC-derived 24VDC or PoE-powered backup supplies. IC Role / Device Role / Timing Role: Constant-current LED driver with analog dimming for daylight harvesting and PWM dimming for emergency strobe modes. Use Value: Dual dimming on one pin simplifies microcontroller GPIO usage; thermal shutdown ensures fail-safe operation during extended battery backup runtime. |
| Low-Voltage Halogen Replacement | Industrial Decorative Lighting |
|
Use Scenario: Retrofitting 12V AC halogen fixtures with efficient white LED modules in hospitality or retail environments. IC Role / Device Role / Timing Role: High-voltage buck LED driver accepting legacy 12VAC (rectified to ~17VDC) or 24VDC inputs while delivering stable current despite input ripple. Use Value: 202mV sense voltage enables use of low-value, low-power sense resistors (<0.5W at 1A); >95% efficiency reduces thermal load in enclosed MR16-style housings. |
Use Scenario: Controlling RGBW LED strips in factory floor accent lighting, where EMI-sensitive PLCs and sensors operate nearby. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-capable LED driver with optimized layout guidance and measured EN55022 Class B EMI compliance. Use Value: Integrated Schottky drive and minimized high-di/dt loops reduce radiated emissions; QFN6 package allows dense placement near LEDs without heatsink bulk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3476EFE#TRPBF | 4-channel synchronous buck with 40V max VIN, higher quiescent current (2.5mA), no integrated MOSFET-requires external high-side switch. | Targeted at multi-string RGB applications; lacks single-pin dimming flexibility and open-LED protection. | Choose for multi-string independent control; avoid when board space or single-wire dimming is critical. |
| TPS92630QPWPRQ1 | Automotive-grade 60V buck LED driver with 1.5A max, integrated PWM generator, but only analog dimming on DIM pin-no native PWM input support. | Qualified to AEC-Q100 Grade 1; includes diagnostic registers via I²C-adds complexity for simple on/off dimming. | Choose for ASIL-B systems requiring diagnostics; avoid when cost-sensitive or microcontroller GPIO count is constrained. |
Compared with LT3476 and TPS92630QPWPRQ1, MP2489DQ-LF-Z offers superior integration (65V MOSFET, single-pin dimming), lower BOM count, and simpler layout-making it optimal for cost-sensitive, space-constrained LED lighting where functional safety diagnostics are not required.
Availability
MP2489DQ-LF-Z is available at Aetrix Electronics and suitable for automotive exterior lighting, emergency exit signage, low-voltage halogen replacement, and industrial decorative lighting requiring stable component supply across long production lifecycles.
Supply support for MP2489DQ-LF-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2489 belongs to MPS's WLED driver product line, engineered specifically for high-input-voltage, high-efficiency constant-current LED applications in automotive, industrial, and architectural lighting where reliability and thermal robustness are critical.
FAQ
What is the maximum LED string voltage supported by MP2489DQ-LF-Z?
The MP2489DQ-LF-Z does not regulate output voltage-it regulates LED current-and supports any LED string voltage up to VIN − VF(diode) − ILED×RDS(on). With 60V max input and typical Schottky VF ≈ 0.4V, it reliably drives strings up to ~55V (e.g., 15×3.3V white LEDs) at 1A, provided thermal limits are observed.
Can MP2489DQ-LF-Z operate with 12VAC input after rectification?
Yes-after full-wave rectification and bulk capacitance, 12VAC yields ~17VDC with ripple. The MP2489DQ-LF-Z's 6–60V input range, 202mV current-sense reference, and hysteretic control maintain stable LED current despite this ripple, making it suitable for halogen retrofit applications without additional DC-DC pre-regulation.
How is thermal performance affected by the QFN6 exposed pad connection?
The QFN6's exposed thermal pad must be soldered to a minimum 100mm² copper area tied to GND. With this, θJA = 50°C/W (4-layer PCB) enables 1.41A continuous current at +25°C ambient. Omitting the pad increases θJA to >100°C/W, limiting usable current to ~0.7A before thermal shutdown.
Does MP2489DQ-LF-Z require external compensation components?
No-its hysteretic control architecture eliminates the need for external compensation networks (e.g., type-II/III error amplifier compensators). Stability is inherent; no loop-phase margin analysis or capacitor-resistor tuning is required, reducing design time and BOM count.
What failure protections are built into MP2489DQ-LF-Z?
MP2489DQ-LF-Z integrates thermal shutdown (150°C), open-LED detection (disables switching if RS = VIN), short-LED detection (shuts down if RS voltage exceeds safe threshold), and input overvoltage clamp (65V absolute max on SW/IN). These operate autonomously without MCU intervention.
Is MP2489DQ-LF-Z RoHS compliant and lead-free?
Yes-MP2489DQ-LF-Z carries the "-LF" suffix per MPS ordering nomenclature, indicating lead-free, RoHS-compliant packaging. All die attach, wire bond, and finish materials meet EU Directive 2011/65/EU requirements, with full material declarations available via MPS Quality Assurance portal.
MP2489DQ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1A
- Frequency:
- 600kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-QFN (3x3)
MP2489DQ-LF-Z FAQ
1.How can I place an order for MP2489DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2489DQ-LF-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP2489DQ-LF-Z reliable?
The price and inventory of MP2489DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2489DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2489DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2489DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2489DQ-LF-Z?
MP2489DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2489DQ-LF-Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP2489DQ-LF-Z?
For technical support, including MP2489DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2489DQ-LF-Z requirements.
6.How does Aetrix verify that MP2489DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2489DQ-LF-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP2489DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2489DQ-LF-Z?
All MP2489DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2489DQ-LF-Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP2489DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP2489DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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