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Monolithic Power Systems Inc. MP2489DN-LF-Z
- Part No.:
- MP2489DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2489DN-LF-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM 1A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
MP2489DN-LF-Z from Monolithic Power Systems is a step-down white LED driver IC with 6V–60V input range, integrated 65V MOSFET, ≥1A output current capability, 202mV feedback reference voltage, and hysteretic control architecture. It regulates high-brightness LED strings in automotive lighting, emergency signage, and low-voltage halogen replacement systems using high-side current sensing.
For engineers reviewing the MP2489DN-LF-Z datasheet, MP2489DN-LF-Z pinout, MP2489DN-LF-Z application, or MP2489DN-LF-Z equivalent, key selection criteria include its wide input voltage tolerance, dual PWM/analog dimming support, open/short LED protection, thermal shutdown, and SOIC8E package compatibility for industrial-grade thermal management.
Technical Context
The MP2489DN-LF-Z implements a fixed-frequency hysteretic control loop that eliminates external compensation while delivering fast transient response and stable LED current regulation via high-side Rsense feedback. Its internal 1.275V reference enables EN/DIM pin functionality for both analog dimming (0.3V–2.5V linear control) and PWM dimming (100Hz–2kHz).
It integrates a 65V-rated power MOSFET switch with 0.5Ω RDS(on), supports up to 1.44A continuous output in SOIC8E package, and features inherent open-LED and short-LED fault protection without auxiliary circuitry. Thermal shutdown activates at 150°C junction temperature with 48°C/W θJA.
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. |
| Feedback Reference Voltage | 202mV ±30mV - Low-sense voltage minimizes I²R loss in current-setting resistor and improves efficiency. |
| Max Output Current | 1.44A - Determined by SOIC8E package thermal resistance (48°C/W) and 150°C TJ(MAX). |
| Dimming Support | PWM (100Hz–2kHz) + Analog (0.3V–2.5V) - Dual-mode control allows flexible brightness management in safety-critical lighting. |
| Switch RDS(on) | 0.5Ω - Integrated 65V MOSFET reduces BOM count and PCB footprint versus external switch solutions. |
| Thermal Shutdown Threshold | 150°C - Protects device during sustained overload or poor heatsinking in enclosed luminaires. |
| Quiescent Current | 1mA - Ensures low standby power in always-on LED systems such as exit signs and emergency lighting. |
Pinout & Package
MP2489DN-LF-Z uses the SOIC8E package (8-pin, exposed pad, RoHS-compliant, lead-free). The exposed thermal pad must be soldered to a GND plane for optimal thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Drain of internal MOSFET | Connects to inductor node and Schottky cathode; carries full switching current and high dv/dt. |
| 2,3,6,7 (GND) | Ground reference and thermal path | Multiple GND pins reduce impedance; exposed pad must be connected to PCB GND for thermal dissipation. |
| 4 (EN/DIM) | Enable and dimming command input | Accepts 0.3V–2.5V analog voltage or 100Hz–2kHz PWM signal; internal 45kΩ pull-up enables auto-start when floating. |
| 5 (RS) | High-side current sense input | Measures voltage across external Rsense resistor; regulates LED current to 202mV threshold. |
| 8 (IN) | Input supply pin | Connects to bulk input capacitor (10µF–22µF); requires low-ESR ceramic for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates loop compensation components and delivers sub-microsecond load transient response without stability tuning. |
| Inherent open-LED protection | Auto-shutdown when RS pin detects no current flow - prevents overvoltage stress on LEDs and external components. |
| 1000:1 PWM dimming resolution | Enables precise brightness grading in architectural and decorative lighting where flicker-free smooth dimming is required. |
| Thermal overload protection | Internal sensor disables switching above 150°C junction temperature and resumes operation after cooldown - no external reset needed. |
| Short-LED protection | Detects abnormally high current through RS pin and latches off to prevent damage during LED string failure or wiring fault. |
Applications
| Automotive Exterior Lighting | Emergency Exit Signage |
|---|---|
|
Use Scenario: Driving 3–6 white LEDs in tail lamps or daytime running lights from 12V/24V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: Constant-current step-down regulator with integrated MOSFET and open-circuit detection. Use Value: Eliminates need for external high-voltage switch and current-sense amplifier; withstands 60V transients per ISO 7637-2. |
Use Scenario: Powering red/green LED arrays in UL 924-compliant exit signs with >90-minute battery backup runtime. IC Role / Device Role / Timing Role: High-efficiency LED driver enabling >95% conversion efficiency at 550mA output to extend battery life. Use Value: Low 202mV VFB minimizes sense resistor power loss, directly improving thermal margin and runtime under battery power. |
| Low-Voltage Halogen Replacement | Industrial Decorative Lighting |
|
Use Scenario: Retrofitting 12V AC/DC halogen fixtures with LED modules in hospitality and retail environments. IC Role / Device Role / Timing Role: Dimmable constant-current source supporting leading-edge and trailing-edge TRIAC dimmer interfaces via analog/PWM translation. Use Value: Dual dimming modes allow seamless integration with legacy wall dimmers and modern digital control systems. |
Use Scenario: Controlling RGBW LED strips in museum display cases and high-end architectural cove lighting. IC Role / Device Role / Timing Role: Robust LED driver with EMI-tested layout (CISPR 22 Class B compliant) for noise-sensitive indoor installations. Use Value: Meets EN55022 radiated emissions limits at 3m distance without added filtering - reduces system-level certification cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3474EMS#TRPBF | Requires external MOSFET; 40V max VIN; 1.5A max IOUT; requires compensation network. | Better suited for lower-input-voltage, higher-current designs where board space permits discrete FET layout. | Select when needing >1.44A output or tighter current accuracy (<±1.5%) at expense of complexity and BOM count. |
| TPS61165DRVR | Boost topology; 2.7V–6V input; 40V max LED string voltage; no integrated switch; 1.2A max IOUT. | Designed for single-cell battery-powered LED flashlights and portable devices - not compatible with 6V–60V input. | Choose only for low-input-voltage boost applications; incompatible with MP2489DN-LF-Z's buck topology and wide-VIN use cases. |
Compared with LT3474EMS#TRPBF and TPS61165DRVR, MP2489DN-LF-Z uniquely combines wide 6V–60V input, integrated 65V MOSFET, and dual-dimming capability in SOIC8E - making it optimal for industrial and automotive LED lighting where input voltage variability and reliability are critical.
Availability
MP2489DN-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 extended temperature ranges and long production lifecycles.
Supply support for MP2489DN-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 mixed-signal ICs for power management, motion control, and interface applications.
The MP2489 belongs to MPS's white LED driver product line, engineered specifically for robust, high-efficiency constant-current regulation in wide-input-voltage industrial and transportation lighting systems.
FAQ
What is the maximum LED string voltage supported by MP2489DN-LF-Z?
The MP2489DN-LF-Z does not regulate LED string voltage directly; it regulates current through the string. The maximum allowable LED forward voltage equals VIN minus the minimum dropout across the internal MOSFET and sense resistor. With 60V input and typical 1.2V diode drop plus 0.5V MOSFET saturation, up to ~58V LED string voltage is feasible - verified in typical applications with 3–12 white LEDs in series.
Can MP2489DN-LF-Z operate without an external current-sense resistor?
No. The MP2489DN-LF-Z requires an external high-side current-sense resistor between IN and RS pins to set and regulate LED current. The device measures voltage across this resistor and maintains it at 202mV ±30mV; omitting Rsense disables current regulation and risks overcurrent damage.
Is soft-start configurable on MP2489DN-LF-Z, and how is it implemented?
Yes. Soft-start is implemented by adding a capacitor (typically 1nF–10nF) between the EN/DIM pin and GND. Charging time of this capacitor by the internal 1.25V reference determines startup delay - approximately 0.2ms per nF. This prevents inrush current and ensures controlled LED turn-on in safety-critical applications.
Does MP2489DN-LF-Z support synchronous rectification?
No. The MP2489DN-LF-Z uses an asynchronous architecture with an external Schottky diode. It does not integrate or drive a synchronous rectifier MOSFET. The datasheet explicitly recommends a Schottky diode for low forward voltage and fast recovery to minimize conduction losses.
What is the recommended minimum inductor value for MP2489DN-LF-Z at 24V input and 550mA output?
For 24V input, 550mA output, and 300kHz switching frequency, the recommended inductor value is 47µH. This balances peak current ripple (~30% of average), core saturation margin, and efficiency. Inductor DCR should be ≤150mΩ to maintain >95% efficiency, and shielding is advised to meet CISPR 22 EMI requirements.
How does MP2489DN-LF-Z handle LED open-circuit faults?
When an open-LED condition occurs, the RS pin voltage drops below detection threshold. The MP2489DN-LF-Z immediately disables the internal MOSFET, pulls SW low, and enters latch-off mode. Recovery requires cycling EN/DIM or power - confirmed in functional testing and documented in the "Inherent Open LED Protection" feature list.
Is MP2489DN-LF-Z pin-compatible with other variants like MP2489DQ or MP2489DJ?
No. MP2489DN-LF-Z (SOIC8E) has 8 pins with specific pinout including four GND connections and dedicated IN/SW/RS/EN/DIM assignments. MP2489DQ (QFN6) and MP2489DJ (TSOT23-5) have different pin counts, layouts, and thermal pad configurations - not mechanically or electrically interchangeable without PCB redesign.
MP2489DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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:
- 8-SOICE
MP2489DN-LF-Z FAQ
1.How can I place an order for MP2489DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2489DN-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 MP2489DN-LF-Z reliable?
The price and inventory of MP2489DN-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 MP2489DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2489DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2489DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2489DN-LF-Z?
MP2489DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2489DN-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 MP2489DN-LF-Z?
For technical support, including MP2489DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2489DN-LF-Z requirements.
6.How does Aetrix verify that MP2489DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2489DN-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 MP2489DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2489DN-LF-Z?
All MP2489DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2489DN-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 MP2489DN-LF-Z part is unused and in its original packaging.
Return procedure for MP2489DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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