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Monolithic Power Systems Inc. MP2493DN-LF-Z
- Part No.:
- MP2493DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2493DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
MP2493DN-LF-Z 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 stable operation with low-ESR ceramic output capacitors. It delivers regulated 0.8V–15V outputs in automotive cigarette lighter adapters and USB power supplies.
For engineers reviewing the MP2493DN-LF-Z datasheet, MP2493DN-LF-Z pinout, MP2493DN-LF-Z application, or MP2493DN-LF-Z equivalent, key selection criteria include its DCR- or resistor-based current limit programming, thermal shutdown behavior, SOIC8E package thermal resistance (θJA = 50°C/W), and compatibility with 4.5V–36V input sources in space-constrained industrial and automotive power rails.
Technical Context
The MP2493DN-LF-Z implements current-mode control with integrated 0.8V reference, slope compensation, and cycle-by-cycle overcurrent protection. Its error amplifier integrates FB voltage error to regulate peak inductor current, while a dedicated current-limit comparator pulls down SS when VISP–VISN ≥ 100mV.
It features a bootstrap gate driver for high-side MOSFET operation, fixed 130kHz oscillator with low-EMI design, and dual protection: thermal shutdown at 150°C and under-voltage lockout with 3.3V threshold and 150mV hysteresis. The SOIC8E package includes an exposed pad tied to GND for enhanced thermal performance.
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 SOIC8E package capable of 2.5W dissipation at +25°C. |
| Switching Frequency | Fixed 130kHz - enables predictable EMI filtering and compact magnetics without external synchronization. |
| Feedback Reference | 0.8V ±2% - sets output voltage via external resistor divider; enables precise 0.8V–15V regulation. |
| Current Sense Threshold | 100mV (typ) - defines programmable current limit; compatible with DCR sensing or precision shunt resistors. |
| Thermal Shutdown | 150°C - protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
| UVLO Threshold | 3.3V (rising) with 150mV hysteresis - prevents erratic startup during brown-out conditions. |
Pinout & Package
The MP2493DN-LF-Z is housed in an 8-pin SOIC8E package with exposed thermal pad on the underside, requiring direct connection to PCB ground plane for optimal thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 4.5V–36V; powers internal circuitry and serves as drain node for internal MOSFET. |
| GND (Pin 2) | Ground reference & thermal pad | Primary voltage reference; exposed pad must be soldered to large GND copper area for heat dissipation. |
| FB (Pin 3) | Output voltage feedback input | Senses divided output voltage; regulates to 0.8V reference; enables 0.8V–15V adjustable output. |
| SS (Pin 4) | Soft-start & current-limit compensation | Controls startup slew rate and bandwidth of current-limit loop; typical 100nF capacitor sets <1kHz loop bandwidth. |
| ISN (Pin 5) | Negative current sense input | Completes differential current-sense path with ISP; rejects common-mode noise in DCR or shunt sensing. |
| ISP (Pin 6) | Positive current sense input | Measures voltage drop across sense element; triggers current limit when VISP–VISN ≥ 100mV. |
| BST (Pin 7) | Bootstrap capacitor connection | Forms floating supply for high-side gate driver; requires 0.1μF ceramic capacitor between BST and SW. |
| SW (Pin 8) | Switch node output | Source of internal MOSFET; connects to inductor; high di/dt node requiring short, low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output current limit | Set via external resistor or inductor DCR without added power loss; threshold defined by 100mV differential sense voltage. |
| Low-EMI fixed-frequency operation | 130kHz switching minimizes conducted EMI; no external frequency setting required; simplifies EMI filter design. |
| Stability with ceramic output capacitors | Compatible with low-ESR X5R/X7R ceramics; eliminates need for electrolytic or tantalum capacitors in space-sensitive designs. |
| Integrated high-side MOSFET | 0.25Ω RDS(ON) reduces conduction loss; enables full 2A output without external switch or driver complexity. |
| Robust fault protection | Cycle-by-cycle current limiting + thermal shutdown + UVLO ensures reliable operation under overload, short-circuit, and input dropout. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 5V/2A USB charging port powered from vehicle 12V battery system with transient voltage spikes up to 36V. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated 5V output with programmable current limit to prevent overloading alternator or fuse. Use Value: Eliminates need for external current-sense amplifier or discrete MOSFET; SOIC8E thermal pad sustains 2A load under elevated under-hood temperatures. |
Use Scenario: Compact 12V-to-5V/3.3V adapter plugged into automotive 12V socket, operating across cold crank (-40°C) to hot soak (+85°C) conditions. IC Role / Device Role / Timing Role: Step-down controller managing input transients, load dumps, and reverse polarity protection interface (with external components). Use Value: Wide 4.5V–36V input range handles cold-crank dips and load-dump surges; fixed 130kHz frequency ensures consistent EMI signature for certification. |
| Power Supply for Linear Chargers | Industrial 24V-to-5V Point-of-Load Conversion |
|
Use Scenario: Pre-regulator supplying clean 5V to linear battery charger ICs (e.g., TP4056) in portable medical devices requiring low-noise, low-ripple input. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter reducing thermal stress on downstream linear regulator. Use Value: Up to 95% efficiency minimizes heat generation; soft-start (SS pin) prevents inrush current into charger input capacitance. |
Use Scenario: DIN-rail mounted PLC I/O module converting 24V bus to isolated 5V logic rail with strict thermal constraints in enclosed enclosures. IC Role / Device Role / Timing Role: High-reliability DC/DC stage delivering stable 5V at 2A with minimal external components and proven thermal margin. Use Value: SOIC8E package's 50°C/W θJA enables full 2A operation without heatsink; current limit protects against field-wiring faults. |
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); higher θJA = 90°C/W; lower max power dissipation (1.4W vs. 2.5W). | Limited to ≤1.5A continuous output in still-air environments; unsuitable for sustained 2A loads above +50°C ambient. | Select only if board layout lacks GND plane area for SOIC8E thermal pad or cost sensitivity outweighs thermal headroom. |
| LM5164QDPRRQ1 | Automotive-grade 1.5A buck; 4.5V–65V input; adjustable frequency; no integrated current-limit programming via ISP/ISN. | Requires external current-sense amplifier and comparator for programmable OCL; larger BOM and layout footprint. | Choose when AEC-Q100 qualification, extended input range (>36V), or frequency synchronization is mandatory. |
Compared with MP2493DS-LF-Z, the MP2493DN-LF-Z provides superior thermal performance for full 2A operation in compact layouts; versus LM5164QDPRRQ1, it offers simpler current-limit implementation but lacks automotive qualification and ultra-wide input support.
Availability
MP2493DN-LF-Z is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial 24V-to-5V point-of-load conversion requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2493DN-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 core expertise in DC/DC converters, LED drivers, and motor drivers.
The MP2493 belongs to MPS's low-EMI, current-mode buck converter product line, designed specifically for space-constrained industrial and automotive power supplies needing programmable current limiting without external sense amplifiers.
FAQ
What is the maximum continuous output current of the MP2493DN-LF-Z?
The MP2493DN-LF-Z delivers 2A continuous output current under typical conditions (TA = +25°C, SOIC8E package, adequate PCB copper). Its 0.25Ω internal MOSFET and 2.5W power dissipation rating enable this performance, provided thermal design meets θJA ≤ 50°C/W per JEDEC JESD51-7 4-layer board guidelines.
How is output current limit programmed on the MP2493DN-LF-Z?
Current limit is set by the differential voltage across ISP and ISN pins, with regulation triggered at 100mV (typ). It supports two methods: (1) DCR sensing using inductor winding resistance, or (2) precision shunt resistor. No external amplifier is needed-the IC internally compares VISP–VISN to the 100mV threshold.
Does the MP2493DN-LF-Z require an external bootstrap diode?
No external bootstrap diode is required. The MP2493DN-LF-Z integrates an on-chip regulator that charges the BST capacitor from VIN. However, if the internal regulator cannot maintain sufficient gate drive under heavy load or low input voltage, a Schottky diode from VIN or VOUT to BST may be added as optional reinforcement.
What is the purpose of the SS pin, and how is it used?
The SS (soft-start) pin controls startup slew rate and serves as the compensation node for the current-limit loop. A capacitor (typically 100nF) from SS to GND sets soft-start time and limits current-loop bandwidth to <1kHz. During overload, the current-limit comparator actively pulls SS low to regulate output current.
Can the MP2493DN-LF-Z operate with ceramic output capacitors only?
Yes. The MP2493DN-LF-Z is explicitly designed for stability with low-ESR ceramic output capacitors (X5R/X7R), eliminating the need for bulk electrolytic or tantalum capacitors. This reduces board area, improves reliability, and avoids aging-related capacitance drift in long-life applications.
What thermal considerations apply to the SOIC8E package?
The SOIC8E package features an exposed thermal pad that must be soldered to a dedicated GND copper pour. Per datasheet, θJA = 50°C/W on a 4-layer JEDEC board. To sustain 2A continuously, ensure ≥2 cm² of 2-oz copper connected to the pad, with thermal vias to inner GND planes-failure to do so risks thermal shutdown above +60°C ambient.
Is the MP2493DN-LF-Z pin-compatible with other MP2493 variants?
Yes-MP2493DN-LF-Z shares identical pinout with MP2493DS-LF-Z (SOIC8) and MP2493DQ-LF-Z (QFN). All variants use the same 8-pin arrangement (VIN, GND, FB, SS, ISN, ISP, BST, SW), enabling drop-in replacement where thermal and package constraints allow.
MP2493DN-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):
- 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-Z FAQ
1.How can I place an order for MP2493DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2493DN-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 MP2493DN-LF-Z reliable?
The price and inventory of MP2493DN-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 MP2493DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2493DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2493DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2493DN-LF-Z?
MP2493DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2493DN-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 MP2493DN-LF-Z?
For technical support, including MP2493DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2493DN-LF-Z requirements.
6.How does Aetrix verify that MP2493DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2493DN-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 MP2493DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2493DN-LF-Z?
All MP2493DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2493DN-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 MP2493DN-LF-Z part is unused and in its original packaging.
Return procedure for MP2493DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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