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Monolithic Power Systems Inc. MP2490DS-LF-Z
- Part No.:
- MP2490DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2490DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,171
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Product details
Overview
MP2490DS-LF-Z from Monolithic Power Systems is a 36V, 1.5A synchronous step-down 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 with 95% efficiency at 500mA and cycle-by-cycle overcurrent protection.
For engineers reviewing the MP2490DS-LF-Z datasheet, MP2490DS-LF-Z pinout, MP2490DS-LF-Z application, or MP2490DS-LF-Z equivalent, this device supports precise load-current limiting using either DCR sensing or external shunt resistors, features thermal shutdown, PGOOD monitoring, and operates across –40°C to +85°C in SOIC-8 package.
Technical Context
The MP2490DS-LF-Z implements peak current-mode control with integrated 700kHz oscillator and slope compensation for stable operation across wide duty cycles. Its error amplifier regulates output voltage by comparing FB voltage against 0.805V reference, while a dedicated current-limit loop monitors VISP–VISN differential voltage to enforce 100mV threshold-based constant-current regulation.
It integrates a bootstrap regulator for high-side gate drive, supports soft-start via SS pin capacitor (typ. 100nF), and uses an open-drain PGOOD signal asserting low when FB falls below 90% of 0.8V. EN pin is not available on SOIC-8 variant (MP2490DS), distinguishing it from QFN10 version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - Supports 12V/24V automotive and industrial rails without pre-regulation |
| Continuous Output Current | 1.5A - Delivers full rated load with thermal shutdown protection at 150°C junction |
| Switching Frequency | 700kHz (±20%) - Enables compact magnetics and EMI filtering with predictable noise spectrum |
| Feedback Reference Voltage | 0.805V (±2.5%) - Sets output voltage accuracy via resistor divider; enables 0.8V–15V adjustment |
| Current Sense Threshold | 100mV (±10%) - Defines programmable current limit point; compatible with DCR or precision shunt sensing |
| Internal MOSFET RDS(ON) | 0.25Ω - Reduces conduction loss and eliminates need for external high-side switch |
| Quiescent Supply Current | 800μA - Minimizes no-load power draw in always-on systems |
Pinout & Package
MP2490DS-LF-Z is housed in an 8-pin SOIC package (body size 4.90mm × 6.00mm) with GND-connected exposed pad omitted (unlike QFN10). Pin 1 is marked with notch or dot; pins are numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Accepts 4.5–36V unregulated supply; connects to input capacitor and feeds internal regulator and gate driver |
| GND (Pin 2) | Ground Reference | Primary return path for feedback, current sense, and power circuits; must be low-impedance and isolated from noisy SW/GND paths |
| FB (Pin 3) | Output Voltage Feedback | Senses resistor divider output; regulates VOUT to 0.805V reference; bandwidth set by R1/CCOMP |
| SS (Pin 4) | Soft-Start & Current Limit Compensation | Connects to external capacitor (typically 100nF) to control startup slew rate and stabilize current-limit loop |
| PGOOD (Pin 5) | Power-Good Monitor | Open-drain output pulled low when FB < 0.72V; signals valid regulation to system controller or enable sequencing |
| SW (Pin 6) | Switch Node | Drives external inductor; carries high di/dt switching current; requires short, wide PCB trace and proximity to VIN/GND caps |
| ISP (Pin 7) | Positive Current Sense Input | High-side current sense terminal; used with ISN to measure load current via shunt or DCR; sensitive to layout |
| ISN (Pin 8) | Negative Current Sense Input | Low-side current sense terminal; completes differential measurement with ISP; matched routing required |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Current Limit | Set precisely via 100mV ISP–ISN threshold-enables accurate foldback or constant-current mode without power loss in sense element |
| Stable with Ceramic Output Capacitors | Compatible with low-ESR X5R/X7R MLCCs-eliminates need for electrolytic capacitors and improves reliability and transient response |
| Integrated Bootstrap Regulator | On-chip charge pump supplies BST voltage-removes need for external bootstrap diode in most designs |
| Cycle-by-Cycle Overcurrent Protection | Real-time peak current limiting per switching cycle-prevents inductor saturation and MOSFET failure during shorts or overload |
| Thermal Shutdown with Hysteresis | Triggers at 150°C junction temperature and releases at ~135°C-provides robust fault recovery without latch-up |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
Use Scenario: 5V/2.4A USB charging port powered from vehicle battery (9–16V). IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering regulated 5V with programmable current limit to prevent fuse blowout during multi-port overload. Use Value: 95% efficiency at 500mA reduces thermal stress in confined dashboard enclosures; PGOOD enables host MCU status reporting. |
Use Scenario: 12V-to-5V conversion in portable car-mounted accessories (e.g., dashcams, tire inflators). IC Role / Device Role / Timing Role: Step-down controller managing variable input (9–36V) during engine cranking and alternator transients. Use Value: 4.5V UVLO ensures operation down to battery sag; 36V max rating withstands load-dump spikes up to 40V. |
| Power Supply for Linear Chargers | Industrial 24V-to-5V Point-of-Load Conversion |
Use Scenario: Pre-regulating 12V rail to 5.5V for linear Li-ion charger IC (e.g., MCP73831). IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter supplying clean, current-limited input to linear charger. Use Value: Programmable current limit prevents charger IC thermal shutdown; soft-start avoids inrush into downstream capacitance. |
Use Scenario: Distributed 24V system powering microcontrollers, sensors, and I/O in factory automation PLC modules. IC Role / Device Role / Timing Role: Compact, rugged point-of-load regulator replacing discrete buck solutions in space-constrained DIN-rail enclosures. Use Value: SOIC-8 package enables wave-soldering; –40°C to +85°C rating supports extended industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2491DS-LF-Z | Higher 2A output current, same 36V input, identical SOIC-8 pinout and 700kHz frequency | Supports higher load currents without redesign; requires larger inductor and output cap | Select when >1.5A continuous load or future-proofing headroom is needed |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 1.5A, 100V input, adjustable frequency (100kHz–2.2MHz), no integrated current limit sense | Designed for harsh environments; lacks ISP/ISN pins-requires external current sense amplifier for limiting | Choose for automotive safety-critical systems requiring qualification and wider input range |
Compared with MP2491DS-LF-Z, MP2490DS-LF-Z offers lower cost and smaller solution size for ≤1.5A loads; versus LM5164QDDARQ1, it provides simpler current-limit implementation but lacks AEC-Q100 certification and 100V surge tolerance.
Availability
MP2490DS-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 MP2490DS-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 design centers in the US, China, and Taiwan, and global distribution since 1997.
The MP2490 belongs to MPS's industrial-grade DC-DC converter product line, engineered for reliable operation in automotive, industrial, and consumer power systems where input voltage variation, thermal stress, and current-limit precision are critical.
FAQ
What is the function of the SS pin on MP2490DS-LF-Z?
The SS (Soft-Start) pin controls startup ramp rate and stabilizes the current-limit loop. An external capacitor (typically 100nF) connected from SS to GND sets soft-start duration and dominates compensation for the load-current regulation loop, preventing overshoot during turn-on and ensuring stable current limiting under fault conditions.
Does MP2490DS-LF-Z include an enable (EN) pin?
No. The EN pin is only present on the QFN10 package variant (MP2490DQ). The SOIC-8 version MP2490DS-LF-Z lacks EN functionality-operation is controlled solely by VIN presence within the 4.5V–36V range and UVLO thresholds (3.3V typical turn-on).
How is output current limit programmed on MP2490DS-LF-Z?
Current limit is set by the differential voltage between ISP and ISN pins. With a sense resistor RSENSE, limit current equals 100mV/RSENSE. For DCR sensing, the limit is determined by inductor DCR and optional RC network per Figure 2a in the datasheet, enabling lossless current monitoring without added shunt power dissipation.
What is the purpose of the PGOOD pin?
PGOOD is an open-drain output that goes low when the FB voltage drops below 90% of 0.805V (i.e., <0.72V), indicating undervoltage or regulation failure. It requires an external pull-up resistor to a system rail and is used for power sequencing, fault signaling, or enabling downstream circuitry only after stable output is achieved.
Can MP2490DS-LF-Z operate with ceramic output capacitors?
Yes. The MP2490DS-LF-Z is explicitly designed for stability with low-ESR ceramic capacitors (X5R/X7R dielectrics). Its internal compensation and current-mode architecture eliminate the need for high-ESR electrolytic capacitors, improving reliability, reducing board area, and enhancing transient response compared to older voltage-mode controllers.
What thermal protection mechanisms does MP2490DS-LF-Z provide?
It integrates thermal shutdown triggered at 150°C junction temperature, with automatic recovery once die temperature falls to ~135°C. This hysteresis prevents cycling near trip point. Combined with 1.39W SOIC-8 power dissipation rating and θJA = 90°C/W, it ensures safe operation under sustained 1.5A load with adequate PCB copper area.
Is MP2490DS-LF-Z RoHS compliant and lead-free?
Yes. The "-LF" suffix denotes lead-free, RoHS-compliant packaging. All MPS parts meet EU RoHS Directive 2011/65/EU requirements, with homogeneous lead content below 1000 ppm, and are qualified per JEDEC J-STD-020 moisture sensitivity level (MSL) 3 for SOIC-8.
MP2490DS-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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-Z FAQ
1.How can I place an order for MP2490DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2490DS-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 MP2490DS-LF-Z reliable?
The price and inventory of MP2490DS-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 MP2490DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2490DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2490DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2490DS-LF-Z?
MP2490DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2490DS-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 MP2490DS-LF-Z?
For technical support, including MP2490DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2490DS-LF-Z requirements.
6.How does Aetrix verify that MP2490DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2490DS-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 MP2490DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2490DS-LF-Z?
All MP2490DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2490DS-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 MP2490DS-LF-Z part is unused and in its original packaging.
Return procedure for MP2490DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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