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Monolithic Power Systems Inc. MP2494DN-LF
- Part No.:
- MP2494DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2494DN-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:3,469
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Product details
Overview
MP2494DN-LF from Monolithic Power Systems is a monolithic 2A, 55V input, 100kHz fixed-frequency step-down DC/DC converter with integrated 0.25Ω high-side MOSFET, adjustable 0.8–45V output, cycle-by-cycle current limiting, and thermal shutdown-designed for automotive cigarette lighter adapters and USB power supplies.
For engineers reviewing the MP2494DN-LF datasheet, MP2494DN-LF pinout, MP2494DN-LF application, or MP2494DN-LF equivalent, key selection criteria include its 4.5–55V wide input range, SOIC8E package thermal performance (θJA = 50°C/W), 100ns minimum on-time, and bootstrap-driven synchronous operation requiring external diode support above 12V output or 65% duty cycle.
Technical Context
The MP2494DN-LF implements peak-current-mode control with internal slope compensation and a 0.8V ±2.5% precision bandgap reference. Its error amplifier integrates feedback error to regulate output voltage while the current comparator compares sensed inductor current against this signal to terminate each switching cycle.
It features a dedicated bootstrap (BST) pin driving the high-side MOSFET gate via an external capacitor, with optional external diode support for high-duty-cycle or high-VOUT operation. Enable logic uses TTL-compatible thresholds (EN < 0.4V off, >1.8V on), and UVLO has 3.3V nominal threshold with 200mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports 12V/24V/48V automotive and industrial bus inputs without pre-regulation |
| Output Current | 2A continuous - delivers full rated load at 125°C junction temperature in SOIC8E package |
| Switching Frequency | Fixed 100kHz - enables predictable EMI filtering and simplifies inductor selection (e.g., 39µH) |
| Feedback Reference | 0.8V ±2.5% - sets output accuracy and defines resistor-divider ratio for VOUT programming |
| High-Side RDS(ON) | 0.25Ω - limits conduction loss at 2A (1W max at full load), enabling compact thermal design |
| Min On-Time | 100ns - supports high input-to-output voltage ratios (e.g., 48V→5V) without pulse-skipping instability |
| Thermal Shutdown | 150°C - protects die during overload or poor PCB heatsinking; auto-recovery after cooldown |
Pinout & Package
MP2494DN-LF is housed in an SOIC8E package (JEDEC MS-012, variation BA), offering improved thermal performance over standard SOIC8 (θJA = 50°C/W vs. 90°C/W) and 2.5W power dissipation at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 4.5–55V unregulated supply; connects to input capacitor and internal LDO for chip bias |
| GND (Pin 2) | Power and signal reference | Return path for switch current and feedback network; must be isolated from noisy SW/GND loops |
| EN (Pin 3) | Enable control input | TTL-compatible logic: <0.4V disables regulator; >1.8V enables; internal pull-up not present |
| FB (Pin 4) | Feedback sensing node | Monitors resistor divider output; internal 2MΩ pull-up to 4V aids start-up but requires external divider |
| SS (Pin 5) | Soft-start timing node | Connects external capacitor to control output voltage ramp rate and limit inrush current |
| GS (Pin 6) | Ground sense reference | Provides Kelvin connection to system ground to reject PCB trace resistance errors in current sensing |
| BST (Pin 7) | Bootstrap supply rail | Drives high-side MOSFET gate above VIN via external capacitor; optional diode improves charge retention |
| SW (Pin 8) | Switch node | Source of internal MOSFET; connects to inductor and external Schottky catch diode or synchronous rectifier |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25Ω High-Side MOSFET | Eliminates external switch and driver, reducing BOM count and layout complexity for 2A buck designs |
| Stable with Ceramic Output Capacitors | Supports low-ESR X5R/X7R MLCCs (e.g., 39µF), avoiding bulk electrolytics and improving reliability |
| Low-EMI Switching Edges | Controlled slew rates minimize radiated emissions, easing compliance with CISPR 25 Class 5 in automotive systems |
| Cycle-by-Cycle Current Limit | 3.5A peak limit prevents inductor saturation and MOSFET failure during short-circuit or startup overload |
| SOIC8E Thermal Enhancement | 2.5W power dissipation rating enables higher ambient operation than SOIC8 (1.38W) without heatsink |
Applications
| Automotive Cigarette Lighter Adapters | Industrial 24V-to-12V Conversion |
|---|---|
Use Scenario: Powering 12V accessories (dashcams, GPS, tire inflators) from vehicle 12V/24V battery via cigarette lighter socket. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 12V at up to 2A with input transients up to 55V (load dump). Use Value: Wide 4.5–55V input handles cold-crank (4.5V) and load-dump (55V) events without external protection circuitry. | Use Scenario: Converting 24V factory floor power to 12V for sensors, PLC I/O modules, or HMI displays. IC Role / Device Role / Timing Role: Fixed-frequency buck controller maintaining stable 12V output under variable industrial loads and temperature extremes. Use Value: 100kHz switching enables small 39µH inductors and ceramic output caps, reducing board space and improving MTBF. |
| USB-C PD Power Delivery Sinks | Ruggedized PoE-Powered Devices |
Use Scenario: Providing 5V/9V/15V programmable outputs for USB-C PD sink applications using external DAC-controlled FB divider. IC Role / Device Role / Timing Role: Adjustable-output DC/DC stage accepting up to 55V input from legacy AC/DC adapters or DC sources. Use Value: 0.8V reference and resistor-divider flexibility allow precise VOUT setting across USB PD profiles without trimming. | Use Scenario: Deriving 5V or 12V rails from IEEE 802.3at (25.5W) or 802.3bt (71W) PoE++ injectors in outdoor cameras or wireless APs. IC Role / Device Role / Timing Role: Secondary regulation stage isolating sensitive electronics from PoE PSE voltage ripple and surges. Use Value: Thermal robustness (125°C TJ operation) and 50°C/W θJA ensure reliable operation inside sealed, passive-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5–65V input, 1A output, 100kHz–2.2MHz adjustable frequency, integrated bootstrap diode | Higher input voltage margin and frequency flexibility, but lower current rating and no GS pin for Kelvin ground sensing | Select when input exceeds 55V or programmable frequency is required; verify loop stability with external compensation |
| TPS54240DGQR | 3.5–42V input, 2A output, 100kHz–2.5MHz adjustable frequency, no BST pin (integrated high-side driver) | Lacks bootstrap architecture-simpler layout but limited to ≤42V input and less efficient at high VOUT/VIN ratios | Select for cost-sensitive 12V/24V systems where 42V max input suffices and external diode-free operation is preferred |
Compared with LM5164QDDARQ1 and TPS54240DGQR, MP2494DN-LF offers superior thermal performance in SOIC8E (2.5W vs. ~1.5W), dedicated GS pin for precision current sensing, and optimized 100kHz operation for low-EMI automotive use-but lacks frequency adjustability and integrated bootstrap diode.
Availability
MP2494DN-LF is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, industrial 24V-to-12V conversion, and ruggedized PoE-powered devices requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP2494DN-LF 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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP2494 belongs to MPS's industrial-grade buck converter product line, engineered for robust operation in automotive, transportation, and harsh-environment applications where wide input range, thermal resilience, and EMI control are critical.
FAQ
What is the maximum recommended output voltage for MP2494DN-LF?
The MP2494DN-LF supports output voltages up to 45V, as specified in the Recommended Operating Conditions table. This limit ensures safe operation of internal circuitry and maintains stability with standard external components. Exceeding 45V risks violating absolute maximum ratings for BST and SW pins, potentially causing latch-up or premature failure.
Does MP2494DN-LF require an external bootstrap diode?
An external bootstrap diode is recommended-not mandatory-for applications with VOUT > 12V, duty cycle > 65%, or fixed 5V input. The diode (e.g., BAT54) improves BST capacitor recharge efficiency, preventing gate drive collapse and ensuring reliable high-side MOSFET turn-on under these conditions.
Can MP2494DN-LF operate with ceramic output capacitors only?
Yes. The MP2494DN-LF is explicitly designed for stability with low-ESR ceramic capacitors (X5R/X7R), as confirmed in the FEATURES section and APPLICATION INFORMATION. A typical design uses 39µF ceramic output capacitance, eliminating need for aluminum or tantalum electrolytics.
What is the purpose of the GS (Ground Sense) pin?
The GS pin provides a Kelvin connection to the system ground plane, separate from the power GND return path. This eliminates voltage drop errors caused by PCB trace resistance in the high-current GND path, ensuring accurate feedback regulation and stable output voltage under dynamic load conditions.
How does the EN pin behave during power-up?
The EN pin has no internal pull-up or pull-down; it must be actively driven. If left floating, the device may power up unpredictably due to noise coupling. For automatic start-up, tie EN directly to VIN. For controlled sequencing, drive EN with a clean logic signal meeting the 1.8V high / 0.4V low thresholds.
Is MP2494DN-LF RoHS-compliant and halogen-free?
Yes. Per the manufacturer's documentation, all MPS parts-including MP2494DN-LF-are lead-free, halogen-free, and fully compliant with the RoHS directive. The "-LF" suffix explicitly denotes RoHS-compliant packaging, verified through MPS Quality Assurance processes.
What is the minimum inductor value recommended for MP2494DN-LF?
The datasheet recommends 33µH to 47µH for most applications, based on 2A load and 30% inductor ripple current. Using <33µH increases peak current stress and conduction losses; values below 100nH violate the 100ns minimum on-time constraint at high input voltages, risking pulse skipping or regulation loss.
MP2494DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 55V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 45V
- Current - Output:
- 2A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP2494DN-LF FAQ
1.How can I place an order for MP2494DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2494DN-LF 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 MP2494DN-LF reliable?
The price and inventory of MP2494DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2494DN-LF is usually 5 days.
3.What payment methods are accepted for MP2494DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2494DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2494DN-LF?
MP2494DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2494DN-LF 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 MP2494DN-LF?
For technical support, including MP2494DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2494DN-LF requirements.
6.How does Aetrix verify that MP2494DN-LF is sourced from the original manufacturer or authorized distributors?
All MP2494DN-LF 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 MP2494DN-LF meets industry standards.
7.What is the process for return or replacement of MP2494DN-LF?
All MP2494DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2494DN-LF, 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 MP2494DN-LF part is unused and in its original packaging.
Return procedure for MP2494DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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