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Monolithic Power Systems Inc. MP2493DN-LF-P
- Part No.:
- MP2493DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2493DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,002
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Product details
Overview
MP2493DN-LF-P from Monolithic Power Systems is a monolithic 2A, 36V step-down DC/DC converter with programmable output current limit via ISP/ISN sensing, fixed 130kHz switching frequency, 0.25Ω internal MOSFET, and low-EMI operation. It delivers stable 0.8V–15V output across 4.5V–36V input, supporting USB power supplies and automotive cigarette lighter adapters with cycle-by-cycle overcurrent protection and thermal shutdown.
For engineers reviewing the MP2493DN-LF-P datasheet, MP2493DN-LF-P pinout, MP2493DN-LF-P application, or MP2493DN-LF-P equivalent, key selection criteria include its programmable current limit architecture (100mV sense threshold), SOIC8E package with exposed thermal pad, 130kHz fixed-frequency operation for EMI control, and compatibility with DCR- or resistor-based current sensing in high-reliability 12V/24V industrial and automotive power rails.
Technical Context
The MP2493DN-LF-P implements current-mode control with integrated 0.25Ω high-side MOSFET and internal slope compensation. Its error amplifier regulates output voltage via FB pin (0.8V reference), while a dedicated current-limit loop monitors VISP–VISN to enforce 100mV threshold-based constant-current regulation.
It features a fixed 130kHz oscillator, bootstrap gate drive (BST–SW), soft-start via external capacitor on SS pin, and fault protection including cycle-by-cycle current limiting and thermal shutdown at 150°C. The SOIC8E package provides 2.5W power dissipation capability and low θJA (50°C/W) due to its exposed pad tied to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide-range industrial and automotive inputs including 12V/24V battery systems. |
| Output Current | 2A continuous - delivered with internal 0.25Ω MOSFET and thermal shutdown at 150°C junction temperature. |
| Switching Frequency | 130kHz fixed - enables predictable EMI filtering and avoids AM radio band interference. |
| Feedback Reference | 0.8V ±2% - sets output voltage via external resistor divider; enables 0.8V–15V adjustable regulation. |
| Current Sense Threshold | 100mV (typ.) - defines programmable output current limit; compatible with DCR or precision shunt sensing. |
| Efficiency | Up to 95% - achieved with low RDS(ON), optimized gate drive, and ceramic-capacitor-compatible stability. |
| Package | SOIC8E - 8-pin surface-mount with exposed thermal pad connected to GND for enhanced thermal performance (θJA = 50°C/W). |
Pinout & Package
MP2493DN-LF-P uses the SOIC8E package: 8-pin surface-mount with exposed thermal pad on underside, requiring direct connection to PCB ground plane for thermal and electrical integrity. Pin 2 (GND) and the exposed pad must both be soldered to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | 4.5V–36V unregulated supply input; also powers internal circuitry and serves as drain node of internal MOSFET. |
| GND (Pin 2) | Ground Reference | Primary analog/digital ground reference; exposed pad must be connected to same net for thermal conduction and noise control. |
| FB (Pin 3) | Feedback Input | Senses output voltage via resistor divider; regulates to 0.8V reference; enables 0.8V–15V output programming. |
| SS (Pin 4) | Soft-Start Control | External capacitor sets startup ramp time and compensates current-limit loop bandwidth (<1kHz). |
| ISN (Pin 5) | Negative Current Sense | Low-side input of differential current sense amplifier; used with ISP to detect load current via 100mV threshold. |
| ISP (Pin 6) | Positive Current Sense | High-side input of differential current sense amplifier; forms VISP–VISN measurement path for programmable OCL. |
| BST (Pin 7) | Bootstrap Supply | Connects to SW via capacitor to generate gate drive voltage >VIN for internal high-side MOSFET. |
| SW (Pin 8) | Switch Node | Source of internal MOSFET; connects to inductor; high di/dt node requiring short, low-inductance PCB routing. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Current Limit | Set via external sense resistor or inductor DCR; no power loss in sensing path; 100mV threshold ensures accuracy and flexibility. |
| Low-EMI Fixed-Frequency Operation | 130kHz switching minimizes conducted EMI and simplifies filter design; avoids sensitive AM radio bands (530–1710kHz). |
| Integrated High-Side MOSFET | 0.25Ω RDS(ON) reduces conduction loss and eliminates external switch; enables compact 2A solution with minimal BOM. |
| Stable with Ceramic Output Capacitors | Compensated for low-ESR ceramics (X5R/X7R); eliminates need for electrolytic capacitors and improves reliability and lifetime. |
| Robust Fault Protection | Cycle-by-cycle current limiting + thermal shutdown (150°C) + UVLO (3.3V threshold) ensure safe operation under overload, short-circuit, and brownout. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 5V/2A USB charging port powered from 12V vehicle battery with transient ride-through. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V output with programmable current limit to meet USB BC1.2 spec. Use Value: Enables single-stage conversion from 9–16V automotive rail to 5V/2A with <100mV load regulation and thermal foldback during sustained draw. |
Use Scenario: Compact 12V-to-5V adapter plugged into car cigarette lighter socket powering tablets or dashcams. IC Role / Device Role / Timing Role: Step-down controller managing variable input (9–36V) and load transients while maintaining EMI compliance in confined space. Use Value: SOIC8E package with exposed pad sustains 2A continuous output at 85°C ambient; 130kHz frequency eases FCC Part 15 filtering. |
| Linear Charger Power Supplies | Industrial 24V-to-5V/3.3V Point-of-Load |
|
Use Scenario: Pre-regulator supplying clean 5V to linear battery charger IC (e.g., TP4056) in portable medical devices. IC Role / Device Role / Timing Role: Efficient intermediate stage reducing heat in downstream linear regulator; current limit protects battery during pre-charge. Use Value: Programmable OCL prevents overcurrent into charger input; 0.8V FB reference allows precise 5.0V ±1% output matching charger requirements. |
Use Scenario: Distributed 24V bus powering isolated microcontroller peripherals requiring stable 3.3V/1.8V rails in factory automation controllers. IC Role / Device Role / Timing Role: Non-isolated buck converter delivering tightly regulated output with low ripple and fast transient response. Use Value: Current-mode control ensures stability across wide input range; ceramic-capacitor compatibility enhances long-term reliability in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2493DS-LF-Z | SOIC8 (non-exposed pad); θJA = 90°C/W; 1.4W max power dissipation vs. 2.5W for SOIC8E. | Limited to lower ambient temperatures or derated output current in enclosed spaces. | Select when board space constraints prohibit exposed-pad layout or thermal management is handled externally. |
| MPQ2493DN-LF-Z | Automotive-grade AEC-Q100 qualified; extended –40°C to +125°C operating junction temperature. | Required for under-hood or safety-critical automotive subsystems where qualification is mandatory. | Choose for automotive OEM designs needing full AEC-Q100 compliance and extended temperature margin. |
Compared with MP2493DS-LF-Z, the MP2493DN-LF-P offers superior thermal performance (2.5W vs. 1.4W) and higher reliability in thermally constrained layouts; versus MPQ2493DN-LF-Z, it lacks AEC-Q100 certification but provides identical electrical performance at lower cost for industrial use.
Availability
MP2493DN-LF-P is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and linear charger power supplies requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2493DN-LF-P 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 serving global industrial, automotive, and consumer markets since 1997.
The MP2493 belongs to MPS's high-voltage buck converter product line, designed specifically for robust, low-EMI DC/DC conversion in 12V/24V/36V systems where programmable current limiting and thermal resilience are critical.
FAQ
What is the function of the SS pin on MP2493DN-LF-P?
The SS (Soft-Start) pin controls startup behavior and current-limit loop compensation. An external capacitor (typically 100nF) connected to SS determines the output voltage ramp time and sets the bandwidth of the load current regulation loop to below 1kHz, preventing inrush current and ensuring stable current limiting during faults.
Can MP2493DN-LF-P operate with only ceramic output capacitors?
Yes - the MP2493DN-LF-P is internally compensated for low-ESR ceramic capacitors (X5R/X7R). No electrolytic or tantalum capacitors are required, enabling smaller footprint, longer lifetime, and improved reliability in temperature-varying environments without compromising loop stability.
How is output current limit programmed on MP2493DN-LF-P?
Output current limit is set by the differential voltage across ISP and ISN pins, with regulation triggered at 100mV (typ.). This can be implemented using either an external sense resistor (IOUT = 0.1V/RSENSE) or inductor DCR sensing, eliminating power loss in the current-sense path and supporting flexible layout.
What is the purpose of the exposed pad on the SOIC8E package?
The exposed pad on the MP2493DN-LF-P SOIC8E package must be soldered to a PCB ground plane to serve dual functions: thermal conduction (reducing θJA to 50°C/W) and low-impedance grounding for noise-sensitive analog circuits like the current-sense amplifier and feedback network.
Does MP2493DN-LF-P support enable/shutdown functionality?
No - the MP2493DN-LF-P does not include an EN pin. Shutdown is achieved by pulling VIN below the UVLO threshold (3.3V typ.) or disconnecting input power. For controlled enable/disable, external circuitry (e.g., high-side switch) is required upstream of VIN.
What is the maximum recommended inductor DCR for accurate current sensing?
For DCR-based current sensing, the inductor's DCR must be precisely known and stable over temperature. MPS recommends DCR tolerance ≤±5% and TCR <100ppm/°C; typical values range from 20mΩ to 100mΩ depending on output current and ripple requirements.
Is MP2493DN-LF-P pin-compatible with other MP2493 variants?
Yes - MP2493DN-LF-P shares identical pinout and electrical characteristics with MP2493DS and MPQ2493DN variants. Only package (SOIC8E vs. SOIC8), thermal rating, and qualification grade differ; no PCB redesign is needed when migrating between DN and DS versions.
MP2493DN-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2A
- Frequency - Switching:
- 130kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP2493DN-LF-P FAQ
1.How can I place an order for MP2493DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2493DN-LF-P 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 MP2493DN-LF-P reliable?
The price and inventory of MP2493DN-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2493DN-LF-P is usually 5 days.
3.What payment methods are accepted for MP2493DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2493DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2493DN-LF-P?
MP2493DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2493DN-LF-P 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 MP2493DN-LF-P?
For technical support, including MP2493DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2493DN-LF-P requirements.
6.How does Aetrix verify that MP2493DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2493DN-LF-P 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 MP2493DN-LF-P meets industry standards.
7.What is the process for return or replacement of MP2493DN-LF-P?
All MP2493DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2493DN-LF-P, 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 MP2493DN-LF-P part is unused and in its original packaging.
Return procedure for MP2493DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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