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Monolithic Power Systems Inc. MP2490DS-LF
- Part No.:
- MP2490DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2490DS-LF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,050
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Product details
Overview
MP2490DS-LF from Monolithic Power Systems is a 36V, 1.5A synchronous step-down DC/DC converter with programmable output current limit via ISP/ISN sense inputs, fixed 700kHz switching frequency, and 0.25Ω internal MOSFET. It delivers stable 5V output from 8–24V input in automotive cigarette lighter adapters and USB power supplies, supporting ceramic output capacitors and DCR-based current sensing.
For engineers reviewing the MP2490DS-LF datasheet, MP2490DS-LF pinout, MP2490DS-LF application, or MP2490DS-LF equivalent, this page provides verified package mapping (SOIC-8), confirmed pin functions (including EN-disabled ISP/ISN current limit interface), thermal shutdown behavior, cycle-by-cycle OCP, and real-world efficiency curves at 5V/1.5A load.
Technical Context
The MP2490DS-LF implements peak-current-mode control with integrated 700kHz oscillator, error amplifier referenced to 0.805V feedback threshold, and dedicated current-sense amplifier with 100mV regulation threshold on ISP–ISN. Its internal 0.25Ω high-side MOSFET enables high-efficiency operation across 4.5–36V input range.
Current limiting is implemented through a dual-loop architecture: primary regulation via FB pin sets output voltage; secondary current regulation activates when VISP–VISN ≥ 100mV, pulling down SS pin to fold back duty cycle. Soft-start is controlled by external capacitor on SS pin, with typical 100nF value setting <1kHz loop bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports 12V/24V automotive and industrial bus rails without pre-regulation |
| Output Current | 1.5A continuous - sustained at full load with SOIC-8 package under TA ≤ +85°C |
| Switching Frequency | 700kHz fixed - enables compact magnetics and low-output-ripple design with 12μH inductor |
| Feedback Reference | 0.805V ±2% - sets output voltage via resistor divider; enables 0.8V–15V adjustable range |
| Current Sense Threshold | 100mV ±10mV - defines precise output current limit; compatible with DCR or discrete sense resistor |
| Internal MOSFET RDS(ON) | 0.25Ω - reduces conduction loss; achieves 95% efficiency at 500mA/5V output |
| Thermal Shutdown | 150°C junction - protects against sustained overload; recovers automatically after cooldown |
Pinout & Package
MP2490DS-LF is housed in an 8-pin SOIC package with exposed pad not connected (unlike QFN variant). Pin 1 is marked with notch or dot; pins are numbered counterclockwise. GND (Pin 2) serves as both power and signal reference; SW (Pin 8) carries high di/dt switching node requiring tight layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 4.5–36V; requires local 4.7μF ceramic input capacitor placed adjacent to Pin 1 and Pin 2 |
| GND (Pin 2) | Power and signal ground reference | Must be low-impedance plane; isolated from high-current return paths to avoid noise coupling into FB/ISN/ISP |
| FB (Pin 3) | Output voltage feedback input | Compares divided output to 0.805V reference; sets regulation point; sensitive to PCB trace noise |
| SS (Pin 4) | Soft-start and current-limit compensation | External 100nF capacitor controls startup ramp rate and bandwidth of current-limit loop |
| PGOOD (Pin 5) | Open-drain power-good indicator | Pulls low when FB < 0.72V (90% of 0.805V); requires external pull-up to system rail |
| SW (Pin 8) | Switch node output | Connects to inductor and catch diode; high dv/dt node-must be short, wide, and远离 FB/ISN/ISP traces |
| ISP (Pin 7) | Positive current sense input | High-side current sense terminal; paired with ISN for differential 100mV threshold detection |
| ISN (Pin 6) | Negative current sense input | Low-side current sense terminal; matched routing required with ISP to reject common-mode noise |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output current limit | Set precisely to 1.5A using 66.7mΩ sense resistor or inductor DCR-no external shunt power loss |
| Stable with ceramic output capacitors | Supports low-ESR X5R/X7R ceramics ≥10μF-eliminates need for electrolytic or tantalum |
| Cycle-by-cycle overcurrent protection | Detects instantaneous switch current exceeding ~2.6A-prevents MOSFET failure during short-circuit |
| Fixed-frequency current-mode control | 700kHz clock ensures predictable EMI profile and simplifies filter design vs. variable-frequency alternatives |
| Thermal shutdown with auto-recovery | Triggers at 150°C junction; resumes operation after die cools below hysteresis threshold |
Applications
| USB Power Supply | Automotive Cigarette Lighter Adapter |
|---|---|
|
Use Scenario: 5V/1.5A USB charging port powered from vehicle 12V battery with transient spikes up to 36V. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V output; handles line transients and cold-crank conditions. Use Value: 36V max input withstands load-dump events; 95% efficiency at 500mA minimizes thermal stress in enclosed adapter housing. |
Use Scenario: Compact 12V-to-5V converter mounted behind dashboard, powering infotainment USB ports. IC Role / Device Role / Timing Role: Step-down controller with programmable current limit protecting downstream USB devices from overcurrent. Use Value: ISP/ISN differential sensing rejects engine noise; SOIC-8 package allows manual rework and cost-effective assembly. |
| Linear Charger Power Supply | Industrial 24V-to-5V Point-of-Load |
|
Use Scenario: Pre-regulator feeding linear charger IC (e.g., MCP73831) in portable medical device with strict ripple requirements. IC Role / Device Role / Timing Role: Efficient intermediate-stage converter reducing dropout voltage across linear stage. Use Value: Fixed 700kHz frequency enables predictable filtering; soft-start (SS pin) prevents inrush into downstream LDO. |
Use Scenario: DIN-rail mounted PLC I/O module requiring clean 5V rail from 24V industrial bus with >1.2A load. IC Role / Device Role / Timing Role: Main DC/DC converter delivering isolated 5V supply; thermal shutdown safeguards against enclosure overheating. Use Value: 1.5A rating supports multiple I/O channels; SOIC-8 footprint allows standard wave-solder process and field replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2490DQ-LF | QFN10 (3×3mm) package with EN pin enabled; 2.5W power dissipation vs. SOIC-8's 1.39W | Requires PCB reflow and exposes thermal pad; better suited for space-constrained, high-efficiency designs | Select when board area is limited and thermal management via exposed pad is feasible |
| LM5164QDDARQ1 | 4.5–65V input, 1A output, 1MHz frequency; AEC-Q100 qualified; no integrated current-sense amplifier | Designed for automotive systems requiring functional safety; lacks ISP/ISN pins-requires external current monitor | Choose for ASIL-B applications where qualification and extended VIN outweigh programmable current limit need |
Compared with MP2490DS-LF, the MP2490DQ-LF offers higher thermal performance in smaller footprint but demands more complex layout; the LM5164QDDARQ1 adds automotive qualification and wider VIN but removes integrated current limiting-requiring external circuitry for load protection.
Availability
MP2490DS-LF is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial 24V-to-5V point-of-load converters requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MP2490DS-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.
The MP2490 belongs to MPS's industrial-grade buck converter product line, engineered for robust operation in automotive, industrial, and consumer power applications where wide input range and programmable current limiting are critical.
FAQ
What is the maximum output current achievable with MP2490DS-LF in SOIC-8 package?
The MP2490DS-LF delivers 1.5A continuous output current at TA ≤ +85°C with proper PCB copper area and airflow. Its SOIC-8 package has 1.39W max power dissipation and 90°C/W θJA; exceeding 1.5A risks thermal shutdown due to junction temperature exceeding 150°C.
Can MP2490DS-LF use inductor DCR for current sensing, and what is the accuracy impact?
Yes-MP2490DS-LF supports DCR sensing per Figure 2a in the datasheet. Accuracy depends on DCR tolerance (typically ±5–10%) and temperature drift; for ±3% current limit accuracy, a precision sense resistor (e.g., 66.7mΩ ±0.5%) is recommended instead.
Why does MP2490DS-LF lack an EN pin, unlike MP2490DQ?
The DS suffix denotes SOIC-8/PDIP variants where the EN function is omitted per ordering table. Pin 3 is FB, Pin 4 is SS-no dedicated enable input. System-level ON/OFF control must be implemented externally via VIN sequencing or PGOOD-monitored latch.
What is the minimum output voltage achievable with MP2490DS-LF?
The minimum regulated output voltage is 0.8V, set by the internal 0.805V feedback reference. Below this, regulation is lost; the device enters foldback mode when FB drops below 250mV, reducing switching frequency to limit power dissipation during short circuits.
How does the ISP/ISN current limit interact with the FB voltage regulation loop?
MP2490DS-LF uses priority arbitration: FB regulates output voltage until VISP–VISN reaches 100mV, then the current limit loop dominates by pulling down SS pin to reduce duty cycle. This maintains constant current while allowing voltage to droop-enabling CC/CV behavior for battery charging.
Is MP2490DS-LF compatible with ceramic output capacitors, and what ESR range is supported?
Yes-MP2490DS-LF is explicitly characterized for stability with low-ESR ceramic capacitors (X5R/X7R). The datasheet confirms stable operation with ≥10μF output capacitance and ESR as low as 5mΩ; no minimum ESR requirement exists, unlike older controllers needing electrolytics.
What is the purpose of the SS pin beyond soft-start, and how does it affect current limiting?
SS pin serves dual role: (1) soft-start ramp generator (via external capacitor), and (2) error amplifier output for the current limit loop. When current limit activates, SS is pulled down to regulate average inductor current-its voltage directly controls peak current threshold, making capacitor selection critical for loop stability.
MP2490DS-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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2490DS-LF FAQ
1.How can I place an order for MP2490DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2490DS-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 MP2490DS-LF reliable?
The price and inventory of MP2490DS-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2490DS-LF is usually 5 days.
3.What payment methods are accepted for MP2490DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2490DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2490DS-LF?
MP2490DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2490DS-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 MP2490DS-LF?
For technical support, including MP2490DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2490DS-LF requirements.
6.How does Aetrix verify that MP2490DS-LF is sourced from the original manufacturer or authorized distributors?
All MP2490DS-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 MP2490DS-LF meets industry standards.
7.What is the process for return or replacement of MP2490DS-LF?
All MP2490DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2490DS-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 MP2490DS-LF part is unused and in its original packaging.
Return procedure for MP2490DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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