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Monolithic Power Systems Inc. MP2489DJ-LF-Z
- Part No.:
- MP2489DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP2489DJ-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 1A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,273
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Product details
Overview
MP2489DJ-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-designed for automotive decorative lighting, emergency signage, and low-voltage halogen replacement systems.
For engineers reviewing the MP2489DJ-LF-Z datasheet, MP2489DJ-LF-Z pinout, MP2489DJ-LF-Z application, or MP2489DJ-LF-Z equivalent, key selection criteria include its 1000:1 PWM dimming resolution, thermal shutdown protection, open/short LED fault detection, and TSOT23-5 package compatibility with space-constrained LED driver designs.
Technical Context
The MP2489DJ-LF-Z implements a fixed-frequency hysteretic control scheme that regulates LED current via high-side sensing across an external resistor, eliminating loop compensation while delivering sub-100ns response to load transients. Its internal 1.275V reference sets both enable threshold and current-sense comparator hysteresis (±30mV), enabling stable operation without external compensation networks.
Dimming is implemented through dual-mode EN/DIM pin functionality: analog dimming accepts 0.3V–2.5V DC to linearly scale LED current from 25% to 200%, while PWM dimming supports 100Hz–2kHz square-wave inputs with duty-cycle proportional output current. The device integrates inherent open-LED and short-LED protection, triggered by absence or collapse of sensed current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V–60V - supports direct connection to 12V/24V/48V industrial and automotive rails without pre-regulation. |
| Max Output Current | ≥1A - delivers sufficient drive for multi-string high-brightness LED arrays in signage and emergency lighting. |
| Feedback Reference Voltage | 202mV ±30mV - low sense voltage minimizes I²R loss in current-setting resistor and improves efficiency above 95%. |
| Dimming Resolution | 1000:1 PWM - enables precise brightness control in architectural and display backlighting applications. |
| Switch RDS(on) | 0.5Ω - integrated 65V MOSFET reduces BOM count and PCB footprint versus external-FET solutions. |
| Thermal Shutdown Threshold | 150°C junction - protects against sustained overloads in enclosed fixtures without external thermal monitoring. |
| Min/Max Switching Frequency | 100kHz–600kHz - allows optimization of inductor size vs. EMI in space- or noise-sensitive designs. |
Pinout & Package
MP2489DJ-LF-Z is packaged in TSOT23-5 (3mm × 1.7mm × 0.9mm), featuring exposed pad for thermal enhancement and RoHS-compliant matte-tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Drain of internal MOSFET | Connects to inductor and Schottky diode cathode; carries full switching current and high dv/dt. |
| 2 (GND) | Power and signal ground | Common return for internal regulator, current sense amplifier, and thermal pad; must be low-impedance. |
| 3 (EN/DIM) | Enable and dimming command input | Accepts 0.3–2.5V analog or 100Hz–2kHz PWM signal; internal 45kΩ pull-up enables auto-start when floating. |
| 4 (RS) | High-side current sense input | Connects to current-sense resistor between IN and LED string; measures average LED current with 202mV reference. |
| 5 (IN) | Input supply pin | Accepts 6–60V input; requires local 10–22µF low-ESR capacitor to suppress switching ripple and surge currents. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic control architecture | Eliminates need for external compensation components and provides <100ns transient response to LED load changes. |
| Integrated 65V MOSFET | Reduces bill-of-materials count and layout complexity versus discrete-FET buck LED drivers. |
| Dual-mode dimming (PWM + analog) | Enables flexible brightness control: 1000:1 PWM resolution for flicker-free dimming or 0.3–2.5V analog for smooth analog control. |
| Inherent open-LED and short-LED protection | Automatically disables output and enters latch-off state upon detection of open-circuit or shorted LED string. |
| Low 202mV feedback voltage | Minimizes power dissipation in current-sense resistor, improving system efficiency especially at high output currents. |
Applications
| Automotive Decorative Lighting | Emergency Exit Signage |
|---|---|
|
Use Scenario: Illuminating interior ambient strips and exterior accent lighting on 12V/24V vehicle platforms. IC Role / Device Role / Timing Role: Step-down LED driver regulating constant current to parallel LED strings under wide-input voltage transients (load dump, cold crank). Use Value: Integrated 65V MOSFET withstands 60V max input; thermal shutdown prevents failure during prolonged cabin heat exposure. |
Use Scenario: Powering red/green LED arrays in UL 924-compliant exit signs with battery backup. IC Role / Device Role / Timing Role: Constant-current LED driver maintaining luminance across 6–60V input range during AC mains failure and DC battery discharge. Use Value: Open-LED protection ensures fail-safe indication; 1000:1 PWM dimming enables low-power standby mode without color shift. |
| Low-Voltage Halogen Replacement | Architectural Accent Lighting |
|
Use Scenario: Retrofitting 12V MR16 halogen lamps with efficient LED modules in residential/commercial track lighting. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing magnetic transformers, delivering regulated current independent of input ripple. Use Value: >95% efficiency reduces thermal load in enclosed fixtures; analog dimming matches legacy TRIAC-dimmer behavior. |
Use Scenario: Driving RGB or tunable-white LED strips in hospitality and retail environments requiring smooth dimming. IC Role / Device Role / Timing Role: Precision current source enabling synchronized multi-channel dimming via shared EN/DIM control signals. Use Value: Dual-mode dimming supports both DALI-analog interface and microcontroller-generated PWM; TSOT23-5 footprint saves board area. |
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 |
|---|---|---|---|
| MPQ2489DJ-AEC1 | AEC-Q100 Grade 1 qualified; identical electrical specs but rated for -40°C to +125°C junction temperature. | Required for automotive under-hood or headlamp applications where extended temperature compliance is mandated. | Select when automotive qualification and enhanced reliability testing are required beyond commercial-grade operation. |
| LT3476EFE#TRPBF | Quad-output, 40V max input, 1.2A per channel; requires external MOSFETs and compensation network. | Suitable for multi-string RGBW LED systems needing independent current control per channel. | Choose only when driving ≥2 independent LED strings with separate dimming control; adds complexity and cost. |
Compared with MPQ2489DJ-AEC1, the MP2489DJ-LF-Z offers lower cost and smaller footprint for non-automotive applications, while LT3476EFE demands more design effort but enables multi-channel flexibility not available in single-output MP2489.
Availability
MP2489DJ-LF-Z is available at Aetrix Electronics and suitable for automotive decorative lighting, emergency signage, and low-voltage halogen replacement requiring stable component supply across industrial and commercial production cycles.
Supply support for MP2489DJ-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, headquartered in California and operating globally since 1997.
The MP2489 belongs to MPS's WLED driver product line, engineered specifically for high-efficiency, wide-input-range constant-current LED driving in thermally constrained and safety-critical lighting systems.
FAQ
What is the maximum continuous LED current supported by MP2489DJ-LF-Z in TSOT23-5 package?
The MP2489DJ-LF-Z supports up to 1.00A continuous LED current in TSOT23-5 package, limited by thermal resistance (θJA = 100°C/W) and maximum junction temperature of 125°C under typical PCB layout conditions. Derating is required above +70°C ambient.
Can MP2489DJ-LF-Z operate without an external current-sense resistor?
No. The MP2489DJ-LF-Z requires an external high-side current-sense resistor between IN and RS pins to set LED current. The device regulates based on 202mV across this resistor; omitting it disables current regulation and risks overcurrent damage.
Does MP2489DJ-LF-Z support synchronous rectification?
No. The MP2489DJ-LF-Z uses an asynchronous architecture with external Schottky diode for freewheeling. It does not integrate or support a synchronous rectifier MOSFET; the SW pin drives only the internal high-side switch.
How is soft-start implemented on MP2489DJ-LF-Z?
Soft-start is implemented by placing a capacitor (typically 1nF–10nF) between EN/DIM and GND. Internal 1.25V reference charges this capacitor, delaying full LED current ramp-up. Delay time approximates 0.2ms per nF capacitance value.
What failure protections are built into MP2489DJ-LF-Z?
The MP2489DJ-LF-Z includes thermal shutdown (150°C), open-LED detection (no current flow), short-LED detection (excessive current), and input overvoltage clamp (65V absolute max). All protections trigger automatic latch-off until input reset.
Is MP2489DJ-LF-Z compatible with PWM dimming frequencies above 2kHz?
No. The datasheet specifies 100Hz–2kHz as the valid PWM dimming frequency range. Frequencies above 2kHz may cause incomplete current regulation cycles, leading to unstable LED current and audible noise due to insufficient settling time per switching period.
What is the minimum recommended input capacitance for MP2489DJ-LF-Z?
A minimum 10µF ceramic or low-ESR electrolytic capacitor is recommended between IN and GND. This value suppresses input surge current and high-frequency switching noise; values up to 22µF improve stability under dynamic load conditions.
MP2489DJ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
MP2489DJ-LF-Z FAQ
1.How can I place an order for MP2489DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2489DJ-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 MP2489DJ-LF-Z reliable?
The price and inventory of MP2489DJ-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 MP2489DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2489DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2489DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2489DJ-LF-Z?
MP2489DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2489DJ-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 MP2489DJ-LF-Z?
For technical support, including MP2489DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2489DJ-LF-Z requirements.
6.How does Aetrix verify that MP2489DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2489DJ-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 MP2489DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2489DJ-LF-Z?
All MP2489DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2489DJ-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 MP2489DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP2489DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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