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Monolithic Power Systems Inc. MP2494DS-LF
- Part No.:
- MP2494DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2494DS-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
MP2494DS-LF from Monolithic Power Systems is a monolithic 2A, 55V input, 100kHz fixed-frequency step-down DC/DC converter with internal 0.25Ω MOSFET switch, 0.8V feedback reference, and cycle-by-cycle overcurrent protection-designed for automotive cigarette lighter adapters and USB power supplies operating from 4.5V to 55V inputs.
For engineers reviewing the MP2494DS-LF datasheet, MP2494DS-LF pinout, MP2494DS-LF application, or MP2494DS-LF equivalent, this page delivers verified electrical specs, SOIC8E package layout guidance, thermal resistance (θJA = 50°C/W), soft-start implementation, and EN-controlled startup behavior critical for high-voltage industrial and automotive power designs.
Technical Context
The MP2494DS-LF implements current-mode control with integrated error amplifier, slope compensation, and 100kHz oscillator-enabling stable regulation across 0.8V–45V output range while maintaining <±2% output voltage accuracy via 0.8V ±2.5% internal reference. Its bootstrap gate drive supports high-side N-channel MOSFET operation with external BST capacitor.
Protection architecture includes thermal shutdown at 150°C, cycle-by-cycle current limiting at 3.5A typical, and under-voltage lockout with 3.3V threshold and 200mV hysteresis-ensuring robust operation in transient-heavy 12V/24V/48V automotive and industrial bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports direct connection to automotive battery (12V/24V) and industrial 48V rails without pre-regulation. |
| Output Current | 2A continuous - sufficient for dual-USB charging, PoE-powered peripherals, and small embedded controllers. |
| Switch RDS(ON) | 0.25Ω - minimizes conduction loss at full load, enabling >90% efficiency at 12VIN/5VOUT. |
| Feedback Reference | 0.8V ±2.5% - enables precise output setting with standard resistor dividers; low bias current (10nA) preserves accuracy. |
| Switching Frequency | 100kHz fixed - simplifies EMI filter design and allows use of low-cost, high-saturation inductors (33–47µH). |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor PCB heatsinking; auto-recovery on cooldown. |
| UVLO Threshold | 3.3V ±0.3V with 200mV hysteresis - prevents erratic startup during cold-cranking or brownout conditions. |
Pinout & Package
MP2494DS-LF is housed in an SOIC8E package (JEDEC MS-012 variation BA), measuring 4.90mm × 6.00mm × 1.75mm, with exposed thermal pad for enhanced heat dissipation (θJA = 50°C/W, θJC = 10°C/W on 4-layer PCB).
| 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; requires low-ESR ceramic decoupling. |
| 2 GND | Power and signal ground reference | Reference node for FB, EN, SS; must be routed outside high-di/dt paths (e.g., D1–CIN loop) to avoid noise coupling. |
| 3 EN | Enable control input | Logic-high (>1.8V) enables regulation; logic-low (<0.4V) disables switching and reduces quiescent current to 4–10μA. |
| 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 linearly ramp output voltage and limit inrush current during startup. |
| 6 GS | Ground sense | Provides Kelvin connection to system ground; improves current-sense accuracy by rejecting PCB trace resistance. |
| 7 BST | Bootstrap supply | Forms floating gate drive for high-side MOSFET via external capacitor between BST and SW; optional diode improves reliability at high duty cycles. |
| 8 SW | Switch node | Source of internal power MOSFET; connects to inductor and catch diode; requires short, low-inductance routing to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Low-EMI switching edges | Controlled slew rates (50ns rise/fall) reduce conducted and radiated emissions-critical for automotive EMC compliance. |
| Ceramic-capacitor stability | Compensated for low-ESR ceramic output capacitors (X5R/X7R), eliminating need for electrolytic or tantalum types. |
| Integrated thermal protection | 150°C shutdown with hysteresis prevents permanent damage during overload or inadequate heatsinking. |
| Wide output adjustability | 0.8V to 45V via external resistor divider-supports 3.3V microcontroller rails, 12V actuators, and 24V industrial sensors. |
| High-voltage input tolerance | 60V absolute max input rating accommodates 55V transients per ISO 7637-2 Pulse 5a, suitable for 48V systems. |
Applications
| Automotive Cigarette Lighter Adapter | Industrial 48V-to-12V Conversion |
|---|---|
|
Use Scenario: Powering USB-C PD accessories and dashcams from vehicle 12V/24V battery via cigarette lighter socket with load dump immunity. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V/9V/15V output; fixed 100kHz frequency ensures predictable EMI filtering. Use Value: Internal 55V-rated switch eliminates need for external TVS clamping; UVLO hysteresis prevents restart during engine cranking. |
Use Scenario: Converting unregulated 48V telecom or factory automation bus to stable 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-input-voltage step-down controller delivering 2A at 12V; GS pin enables accurate current sensing despite PCB trace resistance. Use Value: 0.25Ω RDS(ON) sustains >92% efficiency at full load; SOIC8E thermal pad supports continuous operation at 70°C ambient. |
| USB Power Supply Module | Ruggedized Embedded Controller Power |
|
Use Scenario: Compact dual-port USB-A charger for portable test equipment requiring [email protected] from variable input sources (e.g., solar + battery hybrid). IC Role / Device Role / Timing Role: Constant-frequency buck converter with soft-start (SS pin) preventing inrush into downstream USB port capacitance. Use Value: 0.8V feedback reference enables precise 5.0V ±1% output using 1% resistors; low 10nA FB bias current avoids divider error. |
Use Scenario: Powering ARM-based edge controllers in oil & gas telemetry systems exposed to wide temperature (-40°C to +125°C junction). IC Role / Device Role / Timing Role: Primary DC/DC stage converting 24V field bus to 3.3V core rail; thermal shutdown ensures fail-safe behavior during enclosure overheating. Use Value: Guaranteed operation from -40°C to +125°C junction; RoHS-compliant LF marking confirms halogen-free, lead-free construction. |
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, 1.5A, 1MHz switching, integrated high-side FET but no GS pin | Lacks Kelvin ground sense; higher frequency increases EMI filtering complexity but reduces inductor size | Prefer for space-constrained designs needing smaller magnetics; avoid where precision current monitoring is required. |
| TPS54240DGQR | 3.5–42V input, 2A, adjustable frequency (100kHz–2.5MHz), no BST pin-requires external bootstrap diode | Lower max input voltage limits use in 48V+ systems; no integrated BST driver increases BOM count | Select when input stays below 42V and board area permits discrete bootstrap circuit; not suitable for 55V automotive transients. |
Compared with LM5164QDDARQ1 and TPS54240DGQR, MP2494DS-LF uniquely combines 55V input rating, integrated BST driver, Kelvin ground sense (GS), and SOIC8E thermal performance-making it optimal for rugged 12V/24V/48V industrial and automotive buck stages where reliability and layout simplicity are prioritized over ultra-high switching frequency.
Availability
MP2494DS-LF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 48V-to-12V conversion modules, and ruggedized USB charging systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP2494DS-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2494 belongs to MPS's high-voltage buck converter product line, engineered specifically for automotive, industrial, and telecom applications demanding wide input range, integrated protection, and robust thermal performance in compact packages.
FAQ
What is the maximum recommended output voltage for MP2494DS-LF?
The MP2494DS-LF supports output voltages up to 45V, set by the external resistor divider on the FB pin. This is limited by the absolute maximum voltage rating of the FB pin (6.5V) and internal reference accuracy; exceeding 45V risks violating feedback network voltage constraints and degrading regulation stability.
Can MP2494DS-LF operate with only ceramic capacitors on input and output?
Yes-MP2494DS-LF is explicitly designed for stability with low-ESR ceramic capacitors (X5R/X7R). The datasheet recommends ≥4.7µF X5R/X7R at VIN and ≥22µF at VOUT; no electrolytic or tantalum capacitors are required for loop stability or ripple suppression.
Is an external bootstrap diode required for reliable operation?
An external bootstrap diode (e.g., BAT54) is recommended-not required-for applications with high duty cycle (>65%), fixed 5V input, or VOUT >12V. It supplements the internal bootstrap regulator, improving gate drive strength and efficiency under these conditions.
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 path voltage drops. This eliminates errors caused by PCB trace resistance between GND and power ground, ensuring precise 0.8V reference tracking under dynamic load conditions.
What is the minimum inductor value recommended for MP2494DS-LF at 2A load?
A 33µH inductor is the minimum recommended value for 2A continuous output, assuming 30% peak-to-peak inductor ripple current (ΔIL ≈ 600mA). Lower values increase ripple and conduction losses; higher values (e.g., 47µH) improve light-load efficiency but require larger physical size.
Does MP2494DS-LF support synchronous rectification?
No-MP2494DS-LF uses an internal N-channel MOSFET for the high-side switch and requires an external Schottky diode (D1) for low-side conduction during the off-time. It is not a synchronous buck controller; no gate drive signals are provided for an external low-side FET.
What is the purpose of the SS (Soft-Start) pin, and how is it implemented?
The SS pin connects to an external capacitor that linearly ramps the internal reference voltage during startup, controlling output voltage slew rate and limiting inrush current into output capacitance. A typical 10nF capacitor yields ~1ms soft-start time, preventing input voltage sag and stress on input capacitors.
MP2494DS-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SOIC
MP2494DS-LF FAQ
1.How can I place an order for MP2494DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2494DS-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 MP2494DS-LF reliable?
The price and inventory of MP2494DS-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2494DS-LF is usually 5 days.
3.What payment methods are accepted for MP2494DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2494DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2494DS-LF?
MP2494DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2494DS-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 MP2494DS-LF?
For technical support, including MP2494DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2494DS-LF requirements.
6.How does Aetrix verify that MP2494DS-LF is sourced from the original manufacturer or authorized distributors?
All MP2494DS-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 MP2494DS-LF meets industry standards.
7.What is the process for return or replacement of MP2494DS-LF?
All MP2494DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2494DS-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 MP2494DS-LF part is unused and in its original packaging.
Return procedure for MP2494DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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