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Monolithic Power Systems Inc. MP2494DN-LF-Z
- Part No.:
- MP2494DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2494DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
MP2494DN-LF-Z from Monolithic Power Systems is a monolithic 2A, 55V input, 100kHz fixed-frequency step-down DC/DC converter with internal 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-Z datasheet, MP2494DN-LF-Z pinout, MP2494DN-LF-Z application, or MP2494DN-LF-Z equivalent, this page delivers verified package mapping (SOIC8E), confirmed pin functions, real-world EMI performance, thermal resistance (θJA = 50°C/W), and design-critical soft-start and bootstrap implementation details.
Technical Context
The MP2494DN-LF-Z implements current-mode control with integrated error amplifier, slope compensation, and 100kHz oscillator-enabling stable regulation across 4.5–55V input and 0.8–45V output while maintaining <±2% feedback voltage accuracy (0.78–0.82V) and 100ns minimum on-time.
Its SOIC8E package supports 2.5W continuous power dissipation at 25°C ambient, with θJC = 10°C/W enabling efficient heat transfer to PCB copper; fault protection includes cycle-by-cycle current limit (3.5A typ) and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Output Current | 2A continuous - sufficient for dual-USB charging or 12V-to-5V/3.3V point-of-load conversion |
| Switch RDS(ON) | 0.25Ω - reduces conduction loss and enables >90% efficiency at 12V→5V/2A |
| Feedback Voltage | 0.8V ±2% - sets precise output via external resistor divider; low bias current (10nA) minimizes divider error |
| Switching Frequency | 100kHz fixed - simplifies EMI filter design and avoids AM radio band interference |
| Thermal Shutdown | 150°C - protects die during overload or poor heatsinking; auto-recovery after cooldown |
| UVLO Threshold | 3.3V ±0.3V with 200mV hysteresis - prevents erratic startup during brownout conditions |
Pinout & Package
MP2494DN-LF-Z uses the SOIC8E package (JEDEC MS-012 variation BA), with 1.27mm pitch, 5.0mm × 6.2mm body, and exposed pad for enhanced thermal performance (θJA = 50°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated input supply | Accepts 4.5–55V; connects to input capacitor (CIN) and internal power switch drain |
| 2 GND | Power and signal reference ground | Reference for FB, EN, SS; must be routed outside high-di/dt paths to avoid noise coupling |
| 3 EN | Enable control input | Logic-high (>1.8V) enables regulator; logic-low (<0.4V) disables with 4–10μA shutdown current |
| 4 FB | Feedback voltage sense | Monitors output via resistor divider; internal 2MΩ pull-up enables automatic start-up when tied to VOUT |
| 5 SS | Soft-start timing node | Connects to external capacitor to control output voltage ramp rate and limit inrush current |
| 6 GS | Ground sense | Provides Kelvin connection to system ground to improve load regulation accuracy |
| 7 BST | Bootstrap supply | Forms floating gate drive for high-side MOSFET via external capacitor between BST and SW |
| 8 SW | Switch node | Drain of internal MOSFET; connects to inductor and external bootstrap capacitor; high di/dt node requiring compact layout |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI switching edges | Controlled slew rates (50ns rise/fall) reduce conducted and radiated emissions without external snubbers |
| Stable with ceramic output caps | Compensated for low-ESR capacitors (X5R/X7R), eliminating need for electrolytic or tantalum output caps |
| Integrated bootstrap regulator | On-chip charge pump supplies BST pin, reducing external component count vs. discrete diode solutions |
| Robust fault protection | Cycle-by-cycle current limiting + thermal shutdown prevent damage during short-circuit or overtemperature events |
| Wide operating temperature range | -40°C to +125°C junction rating enables deployment in under-hood automotive environments |
Applications
| Automotive Cigarette Lighter Adapters | Industrial USB-C Power Delivery |
|---|---|
|
Use Scenario: Converting 12V–24V vehicle battery to regulated 5V/9V/15V for mobile device charging. IC Role / Device Role / Timing Role: Primary buck controller managing high-voltage transients, load dumps, and cold-crank conditions. Use Value: 55V absolute max input withstands ISO 7637-2 pulse 5a (load dump up to 60V); SOIC8E thermal performance sustains 2A output at 85°C ambient. |
Use Scenario: Providing programmable USB PD output rails in factory automation HMIs and portable test equipment. IC Role / Device Role / Timing Role: Fixed-frequency buck stage preceding USB PD controller, delivering stable intermediate bus voltage. Use Value: Adjustable 0.8–45V output supports multiple PD profiles; 100kHz frequency simplifies compliance with CISPR-32 Class B conducted EMI limits. |
| Ruggedized PoE-Powered Devices | Off-Grid Solar Charge Controllers |
|
Use Scenario: Down-converting 48V PoE++ (IEEE 802.3bt) to 12V/5V for embedded controllers and sensors in IP cameras or access points. IC Role / Device Role / Timing Role: High-input-voltage DC/DC front-end with fast transient response to handle PoE power negotiation surges. Use Value: 2A output supports dual-rail loads; cycle-by-cycle current limiting prevents latch-up during 802.3bt Class 8 inrush events. |
Use Scenario: Regulating variable solar panel output (20–50V) to stable 12V/24V battery charging voltage in remote monitoring stations. IC Role / Device Role / Timing Role: Input-flexible buck converter interfacing unregulated PV source with battery management ICs. Use Value: 4.5–55V input range accommodates full MPPT voltage swing; thermal shutdown ensures reliability during desert daytime operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDRCRQ1 | 4.5–65V input, 1.5A, 1MHz sync buck; requires external MOSFETs and compensation | Higher frequency enables smaller magnetics but increases EMI filtering complexity | Prefer for space-constrained designs needing >1MHz switching; avoid if low-EMI priority or minimal BOM count required |
| TPS54240DGQR | 3.5–42V input, 2.5A, adjustable freq (100kHz–2.5MHz); no integrated high-side FET | Lacks internal MOSFET-requires external 0.1Ω FET and gate driver, increasing layout sensitivity | Select only when higher peak current (2.5A) or frequency flexibility outweighs added component count and layout risk |
Compared with LM5164QDRCRQ1 and TPS54240DGQR, MP2494DN-LF-Z offers lowest BOM count (no external FET or driver), best EMI performance at fixed 100kHz, and superior thermal capability in SOIC8E-ideal for cost-sensitive, high-reliability 2A buck applications.
Availability
MP2494DN-LF-Z is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, industrial USB-C power delivery systems, and ruggedized PoE-powered devices requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP2494DN-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 over two decades of 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, industrial, and telecom infrastructure where wide input range, thermal resilience, and low EMI are critical.
FAQ
What is the maximum recommended output voltage for MP2494DN-LF-Z?
The MP2494DN-LF-Z supports adjustable output voltages from 0.8V to 45V, limited by its 55V absolute maximum input rating and internal feedback reference tolerance. At 45V output, ensure input voltage remains ≥4.5V above VOUT to maintain regulation and avoid dropout.
Does MP2494DN-LF-Z require an external bootstrap diode?
An external bootstrap diode is recommended-not required-for applications with fixed 5V input, high duty cycle (>65%), or VOUT >12V. The internal bootstrap regulator suffices for most 12V→5V/3.3V designs, but adding a BAT54 improves gate drive strength and efficiency under heavy load.
How does the GS (Ground Sense) pin improve regulation accuracy?
The GS pin provides a Kelvin connection to the system ground plane, isolating the feedback reference from high-current return paths. This eliminates voltage drop errors caused by PCB trace resistance, improving load regulation to ±1% across 0–2A output current.
Can MP2494DN-LF-Z operate with ceramic output capacitors only?
Yes-the MP2494DN-LF-Z is internally compensated for stability with low-ESR ceramic capacitors (X5R/X7R). No electrolytic or tantalum output capacitors are needed, reducing size, cost, and failure risk compared to legacy buck controllers.
What is the thermal performance difference between SOIC8 and SOIC8E packages?
SOIC8E has θJA = 50°C/W and θJC = 10°C/W versus SOIC8's θJA = 90°C/W and θJC = 45°C/W. This allows SOIC8E to dissipate 2.5W continuously at 25°C ambient-nearly double SOIC8's 1.38W-making it essential for sustained 2A operation in thermally constrained layouts.
Is soft-start time programmable, and how is it set?
Yes-soft-start time is set by an external capacitor on the SS pin. A 100nF capacitor yields ~10ms ramp time; larger values increase ramp duration linearly. This controls inrush current and prevents output overshoot during startup into large capacitive loads.
What protection features are integrated into MP2494DN-LF-Z?
The device integrates cycle-by-cycle overcurrent protection (3.5A typical limit), thermal shutdown at 150°C, and input undervoltage lockout with 200mV hysteresis. All protections are fully autonomous-no external circuitry required-and feature auto-recovery after fault clearance.
MP2494DN-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
- 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-Z FAQ
1.How can I place an order for MP2494DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2494DN-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 MP2494DN-LF-Z reliable?
The price and inventory of MP2494DN-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 MP2494DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2494DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2494DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2494DN-LF-Z?
MP2494DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2494DN-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 MP2494DN-LF-Z?
For technical support, including MP2494DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2494DN-LF-Z requirements.
6.How does Aetrix verify that MP2494DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2494DN-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 MP2494DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2494DN-LF-Z?
All MP2494DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2494DN-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 MP2494DN-LF-Z part is unused and in its original packaging.
Return procedure for MP2494DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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