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Monolithic Power Systems Inc. MP2490DQ-LF-P
- Part No.:
- MP2490DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2490DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:635
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Product details
Overview
MP2490DQ-LF-P from Monolithic Power Systems is a 36V, 1.5A synchronous step-down DC/DC converter with programmable output current limit via ISP/ISN sensing, fixed 700kHz switching frequency, and integrated 0.25Ω high-side MOSFET. It operates from 4.5V–36V input, delivers adjustable 0.8V–15V output, and supports USB power supplies and automotive cigarette lighter adapters.
For engineers reviewing the MP2490DQ-LF-P datasheet, MP2490DQ-LF-P pinout, MP2490DQ-LF-P application, or MP2490DQ-LF-P equivalent, key selection criteria include its DCR- or resistor-based current limit programming, thermal shutdown and cycle-by-cycle overcurrent protection, QFN10 (3mm × 3mm) package with exposed thermal pad, and EN-controlled startup sequence unique to the DQ variant.
Technical Context
The MP2490DQ-LF-P implements peak-current-mode control with internal slope compensation and a 700kHz oscillator. Its error amplifier regulates output voltage via FB pin feedback against a 0.805V reference, while a dedicated current-limit loop compares ISP–ISN differential voltage to a 100mV threshold to initiate foldback regulation when load exceeds programmed limit.
It integrates a bootstrap regulator for high-side gate drive, supports soft-start via external SS capacitor, and features open-drain PGOOD monitoring tied to FB voltage accuracy (±10% window). The EN pin enables precise system-level power sequencing - a function absent in SOIC/PDIP variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - Supports wide industrial and automotive battery inputs including 12V/24V systems. |
| Output Current | 1.5A continuous - Delivers stable regulated power under full load at ambient ≤85°C with QFN10 package. |
| Switching Frequency | 700kHz fixed - Enables compact magnetics and low-output-ripple designs without external frequency programming. |
| Feedback Reference | 0.805V ±2.5% - Sets output voltage accuracy; used with external resistor divider for 0.8V–15V adjustment. |
| Current Sense Threshold | 100mV ±10% - Defines precise output current limit point; compatible with DCR sensing or discrete sense resistors. |
| Internal MOSFET RDS(ON) | 0.25Ω - Reduces conduction loss and eliminates need for external high-side switch in most 1.5A applications. |
| Thermal Shutdown | 150°C - Protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
| Quiescent Supply Current | 800μA typical - Minimizes no-load power draw in always-on systems such as automotive infotainment. |
Pinout & Package
MP2490DQ-LF-P is housed in a thermally enhanced QFN10 (3mm × 3mm) package with exposed thermal pad on underside, requiring solder connection to PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 4.5V–36V unregulated supply; connects to input capacitor and serves as source for internal bias rails. |
| GND (Pin 2) | Analog/digital ground reference | Common return for FB, ISN, ISP, and PGOOD; must be isolated from high-current SW/GND paths to avoid noise coupling. |
| EN (Pin 3) | Enable control input | Active-high logic input (1.8V min); only available on DQ variant - enables precise power-up sequencing and standby mode. |
| FB (Pin 4) | Output voltage feedback node | Senses divided output voltage; regulates to 0.805V reference; bandwidth set by external R1/C1 compensation network. |
| SS (Pin 5) | Soft-start and current-limit compensation | Controls startup ramp rate and stabilizes current-limit loop; typical 100nF capacitor sets <1kHz bandwidth. |
| ISN (Pin 6) | Negative current sense input | Low-side terminal of current-sense path; differential voltage vs. ISP determines load current limit activation. |
| ISP (Pin 7) | Positive current sense input | High-side terminal of current-sense path; accepts DCR voltage drop or sense-resistor voltage for accurate current limiting. |
| PGOOD (Pin 8) | Power-good status indicator | Open-drain output asserted high when FB ≥ 0.72V; requires external pull-up for system monitoring or enable chaining. |
| BST (Pin 9) | Bootstrap supply for high-side driver | Connects to SW via 0.1μF ceramic capacitor; enables gate drive above VIN for internal MOSFET. |
| SW (Pin 10) | Switch node | Drain of internal high-side MOSFET and source of external diode; high dv/dt node requiring short, shielded layout. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output current limit | Set via ISP–ISN differential (100mV threshold), supporting both DCR and precision resistor sensing without added power loss. |
| Integrated 0.25Ω MOSFET | Eliminates external high-side switch and associated gate-drive complexity while maintaining >95% efficiency at 500mA (5V out). |
| EN pin with defined logic thresholds | EN low ≤0.4V / high ≥1.8V ensures robust interface with MCU GPIO or PMIC sequencers in multi-rail systems. |
| Stable with ceramic output capacitors | Compensated for low-ESR ceramics (X5R/X7R), reducing BOM count and enabling compact, low-profile designs. |
| Thermal and cycle-by-cycle protection | Combines 150°C junction shutdown with per-cycle current limiting to survive short circuits and inrush events. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
Use Scenario: 5V/2.4A USB charging port powered from 12V vehicle battery with transient tolerance up to 36V. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V output; manages current limit during simultaneous multi-port charging. Use Value: Programmable current limit prevents overloading the vehicle's 12V circuit while maintaining USB-IF compliance via precise 5V regulation (±2%) and low ripple. | Use Scenario: Compact 12V-to-5V adapter plugged into car cigarette lighter socket powering dashcams or GPS units. IC Role / Device Role / Timing Role: Input-transient-hardened step-down converter handling cold-crank (4.5V) and load-dump (36V) conditions per ISO 7637-2. Use Value: Wide 4.5V–36V input range and thermal shutdown ensure reliable operation across automotive voltage extremes without external TVS or LDO pre-regulation. |
| Power Supply for Linear Chargers | Industrial 24V-to-5V/3.3V Point-of-Load |
Use Scenario: Pre-regulator feeding linear charger ICs (e.g., MCP73831) in portable medical devices requiring low-noise, tightly regulated input. IC Role / Device Role / Timing Role: Efficient intermediate-stage converter stepping down 12V/24V battery to 5V for downstream linear regulation and battery charge control. Use Value: Fixed 700kHz frequency avoids audible noise; soft-start (SS pin) prevents inrush into linear charger input capacitance. | Use Scenario: DIN-rail mounted PLC I/O module requiring isolated 5V and 3.3V rails from 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency non-isolated buck stage providing primary 5V rail; enables compact heatsink-free design in sealed enclosures. Use Value: QFN10 package with exposed pad achieves 50°C/W θJA, allowing 1.5A continuous output at +70°C ambient without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2491DQ-LF-Z | Higher 2A output current rating; identical pinout and feature set except increased current limit threshold (120mV). | Required where sustained >1.5A load current or higher peak surge capability is needed. | Select MP2491DQ-LF-Z if future-proofing for higher current or operating near thermal limits of MP2490DQ-LF-P. |
| LM5164QDGQRQ1 | Automotive-grade (AEC-Q100), 1A output, 65V max input; includes spread-spectrum clocking and enhanced EMI filtering. | Targeted at automotive infotainment or ADAS modules requiring AEC-Q100 qualification and lower EMI. | Choose LM5164QDGQRQ1 only when AEC-Q100 compliance, 65V input tolerance, or EMI certification is mandatory. |
Compared with MP2490DQ-LF-P, MP2491DQ-LF-Z offers headroom for higher current but shares identical footprint and programming interface, while LM5164QDGQRQ1 trades current capacity and cost for automotive qualification and extended input range - making it unsuitable for cost-sensitive industrial USB adapters.
Availability
MP2490DQ-LF-P 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 QFN thermal performance.
Supply support for MP2490DQ-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, with core expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MP2490 product line targets cost-sensitive, space-constrained industrial and automotive power applications requiring wide-input, programmable-current-limit buck regulation in compact QFN or SOIC packages.
FAQ
What is the purpose of the SS pin on MP2490DQ-LF-P?
The SS (soft-start) pin controls startup ramp rate and provides dominant-pole compensation for the current-limit loop. Connecting a capacitor (typically 100nF) between SS and GND sets soft-start time and stabilizes current regulation bandwidth below 1kHz, preventing overshoot during load transients or short-circuit recovery.
Can MP2490DQ-LF-P operate without an external sense resistor?
Yes - MP2490DQ-LF-P supports inductor DCR sensing using ISP and ISN pins. A small RC network across the inductor winding converts DCR voltage drop into a filtered signal matching the 100mV current-limit threshold, eliminating the power loss and board area of a discrete sense resistor.
Why does MP2490DQ-LF-P have an EN pin while other MP2490 variants do not?
The EN pin is exclusive to the QFN10 (DQ) package variant per MPS ordering information. It enables system-level power sequencing, remote on/off control, and low-quiescent standby mode - functionality omitted in SOIC and PDIP versions to reduce pin count and cost for simpler applications.
What is the maximum recommended output voltage when input is 12V?
When VIN ≤ 16.5V, the maximum output voltage is limited to (VIN – 1.5V) per datasheet specifications. At VIN = 12V, VOUT must not exceed 10.5V to ensure proper operation of the internal bootstrap circuit and maintain sufficient headroom for the high-side MOSFET gate drive.
How does PGOOD behave during undervoltage or overcurrent conditions?
PGOOD asserts low when FB voltage falls below 90% of 0.805V (i.e., <0.72V), indicating either output undervoltage, startup incomplete, or current-limit foldback active. It remains low during thermal shutdown or sustained overcurrent, providing a single fault indicator for system monitoring without requiring additional sensors.
Is the exposed thermal pad on MP2490DQ-LF-P electrically connected?
Yes - the exposed pad on the QFN10 package is internally connected to GND. It must be soldered to a PCB copper pour tied to the main ground plane to achieve specified θJA = 50°C/W and prevent thermal shutdown under 1.5A continuous load at +85°C ambient.
What is the minimum inductor value recommended for 700kHz operation?
For stable 700kHz operation with ≤30% peak-to-peak inductor ripple current at 1.5A, MPS recommends 12μH (as shown in typical application). Inductor DCR should be <200mΩ, and saturation current rating must exceed 2.0A to accommodate peak current during startup or transient loads.
MP2490DQ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN 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:
- 1.5A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2490DQ-LF-P FAQ
1.How can I place an order for MP2490DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2490DQ-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 MP2490DQ-LF-P reliable?
The price and inventory of MP2490DQ-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 MP2490DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2490DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2490DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2490DQ-LF-P?
MP2490DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2490DQ-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 MP2490DQ-LF-P?
For technical support, including MP2490DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2490DQ-LF-P requirements.
6.How does Aetrix verify that MP2490DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2490DQ-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 MP2490DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2490DQ-LF-P?
All MP2490DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2490DQ-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 MP2490DQ-LF-P part is unused and in its original packaging.
Return procedure for MP2490DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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