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Monolithic Power Systems Inc. MP2492DQ-LF-P
- Part No.:
- MP2492DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2492DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
MP2492DQ-LF-P from Monolithic Power Systems is a monolithic 100kHz step-down DC/DC converter with programmable output current limit, designed for wide-input automotive and industrial power supplies. It delivers 2A continuous output current across 4.5V–55V input, regulates output from 0.8V to 15V, features 0.25Ω internal MOSFET, and supports DCR or resistor-based current sensing for precise load protection in USB power adapters and linear charger supplies.
For engineers reviewing the MP2492DQ-LF-P datasheet, MP2492DQ-LF-P pinout, MP2492DQ-LF-P application, or MP2492DQ-LF-P equivalent, this device offers fixed-frequency current-mode control, cycle-by-cycle overcurrent protection, thermal shutdown, low-EMI switching edges, and QFN10 (3mm × 3mm) packaging optimized for high-voltage buck conversion with minimal external components.
Technical Context
The MP2492DQ-LF-P implements peak-current-mode control with a 100kHz fixed-frequency oscillator and integrated ramp compensation to ensure stable loop dynamics across line and load variations. Its error amplifier compares FB voltage against a 0.8V reference, while the current sense amplifier monitors ISP–ISN differential voltage (100mV threshold) to enable programmable constant-current regulation independent of output voltage setting.
Internal architecture includes a bootstrap gate driver (BST–SW), on-chip regulator for boot capacitor charging, open-drain PGOOD monitoring at 90% of nominal FB voltage, and EN-controlled startup with 3.3V UVLO threshold and 200mV hysteresis-enabling robust operation in noisy 12V/24V/48V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports direct connection to automotive battery (12V/24V), industrial 48V rails, and cigarette lighter inputs without pre-regulation. |
| Output Current | 2A continuous - delivered with <0.25Ω internal high-side MOSFET, enabling compact layout and reduced conduction loss. |
| Switching Frequency | 100kHz fixed - simplifies EMI filter design and enables use of low-cost, high-saturation-current inductors (e.g., 39µH). |
| Feedback Reference | 0.8V ±2% - sets output voltage via external resistor divider; enables 0.8V–15V adjustable regulation with tight line/load regulation. |
| Current Sense Threshold | 100mV (ISP–ISN) - defines programmable output current limit; supports accurate sensing using either inductor DCR or discrete sense resistor. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor PCB thermal design; auto-recovery after cooldown. |
| Quiescent Current | 500–800µA - ensures low standby power in always-on automotive modules and portable power banks. |
Pinout & Package
MP2492DQ-LF-P is housed in a thermally enhanced QFN10 package (3mm × 3mm, 0.5mm pitch) with exposed pad soldered to PCB ground for optimal thermal dissipation (θJC = 12°C/W). The 10-pin layout supports high-voltage buck operation with dedicated current sense, soft-start, bootstrap, and power-good signaling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Main supply input (4.5–55V); connects to input capacitor and serves as source for internal bias and gate driver. |
| GND (Pin 2) | Ground Reference | System ground reference for FB, SS, ISP/ISN, and PGOOD; exposed pad must be connected to PCB ground plane. |
| EN (Pin 3) | Enable Control | Logic-level ON/OFF control; active-high with 3.3V UVLO threshold and 200mV hysteresis for noise immunity. |
| FB (Pin 4) | Feedback Input | Resistor-divider tap point; regulates output by comparing against 0.8V internal reference. |
| SS (Pin 5) | Soft-Start/Compensation | Connects external capacitor to control startup slew rate and provide compensation for current-limit loop. |
| ISN (Pin 6) | Negative Current Sense | Low-side current sense input; used with ISP to measure VSENSE = VISP – VISN for programmable OCP. |
| ISP (Pin 7) | Positive Current Sense | High-side current sense input; forms differential pair with ISN to detect 100mV current-limit threshold. |
| PGOOD (Pin 8) | Power-Good Output | Open-drain signal asserted high when FB ≥ 0.72V (90% of 0.8V); requires external pull-up for system monitoring. |
| BST (Pin 9) | Bootstrap Supply | Connects to SW via 10nF capacitor to generate floating gate drive voltage for internal high-side MOSFET. |
| SW (Pin 10) | Switch Node | Drain of internal MOSFET; connects to inductor and bootstrap capacitor; high dv/dt node requiring short, low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Current Limit | Set via ISP/ISN differential voltage (100mV threshold) - eliminates need for external current-sense amplifier or shunt resistor power loss. |
| Low-EMI Switching Edges | Controlled rise/fall times (50ns each at 12V/5V/2A) - reduces conducted and radiated emissions without external snubbers. |
| Stable with Ceramic Output Capacitors | Compatible with low-ESR X5R/X7R MLCCs - enables compact, high-reliability output filtering without electrolytic capacitors. |
| Integrated Bootstrap Regulator | On-chip charge pump for BST capacitor - eliminates need for external diode in most applications, simplifying BOM. |
| Cycle-by-Cycle Overcurrent Protection | Real-time peak current limiting per switching cycle - prevents inductor saturation and MOSFET failure during short-circuit events. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 12V vehicle battery powering 5V/2A USB-A ports for mobile device charging. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V output with programmable 2A current limit to prevent cable overheating. Use Value: Enables single-stage conversion from 12V–55V input range without pre-regulator; DCR sensing avoids shunt resistor losses. |
Use Scenario: Aftermarket car adapter converting 12V/24V battery to 5V/3.3V for dashcams or GPS units. IC Role / Device Role / Timing Role: High-input-voltage buck controller with thermal shutdown and UVLO for reliable operation in engine-off battery drain conditions. Use Value: 55V max input withstands load-dump transients; QFN10 package supports compact, thermally efficient PCB layout. |
| Power Supply for Linear Chargers | Industrial 24V/48V Point-of-Load Conversion |
|
Use Scenario: Pre-regulating 12V–24V input to 4.2V/1A for Li-ion linear charger ICs in portable medical devices. IC Role / Device Role / Timing Role: Constant-voltage/constant-current buck stage preceding linear charger to reduce thermal stress on pass transistor. Use Value: Programmable current limit ensures safe charging current delivery; 100kHz frequency allows small magnetics and low-noise operation. |
Use Scenario: Converting 48V backplane to 3.3V/2A for FPGA I/O banks or microcontroller peripherals in factory automation controllers. IC Role / Device Role / Timing Role: High-efficiency, high-voltage buck converter with PGOOD monitoring for system power sequencing and fault reporting. Use Value: Integrated 0.25Ω MOSFET and ceramic-capacitor stability reduce component count; PGOOD enables safe power-up coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2491DQ-LF-Z | Same QFN10 package, but rated for 1.5A output and 40V max input - lower current capability and narrower input range. | Suitable for lower-power USB hubs or sensor nodes where 55V tolerance and 2A delivery are unnecessary. | Select when cost sensitivity outweighs need for full 2A/55V margin; verify thermal derating at 48V input. |
| LM5164QDGQRQ1 | Automotive-grade 1A buck with 65V input, 1.5MHz switching, and integrated FET - higher frequency, lower current, AEC-Q100 qualified. | Targeted at automotive infotainment and ADAS systems requiring functional safety compliance and higher switching frequency. | Choose for AEC-Q100-compliant designs needing higher frequency or extended temperature range (–40°C to +150°C). |
Compared with MP2491DQ-LF-Z, MP2492DQ-LF-P provides 33% higher output current and 15V wider input range, making it preferable for demanding 2A automotive loads; versus LM5164QDGQRQ1, it trades AEC-Q100 qualification and 1.5MHz speed for lower quiescent current, simpler compensation, and higher current density in non-automotive industrial use cases.
Availability
MP2492DQ-LF-P is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial point-of-load conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2492DQ-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP2492 belongs to MPS's high-voltage buck converter product line, engineered for robust, low-component-count DC/DC conversion in harsh environments such as automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum allowable input voltage for MP2492DQ-LF-P?
The absolute maximum input voltage is 60V, but the recommended operating range is 4.5V to 55V. Exceeding 55V may trigger overvoltage stress on internal circuitry despite the 60V rating, and operation above 55V voids guaranteed performance per datasheet specifications.
Can MP2492DQ-LF-P operate with only ceramic output capacitors?
Yes - the MP2492DQ-LF-P is explicitly characterized for stability with low-ESR ceramic capacitors (X5R/X7R), eliminating the need for aluminum electrolytics. Typical designs use 22µF–39µF X7R MLCCs, which improve reliability and reduce board area compared to hybrid or tantalum solutions.
How is the output current limit programmed without a sense resistor?
Using inductor DCR sensing: a small RC network (Ra, Rb, Cs) between ISP/ISN and GND converts inductor winding resistance into a proportional voltage drop. When VISP–VISN reaches 100mV, the current limit loop activates - enabling lossless current limiting without shunt resistor power dissipation.
What is the purpose of the SS pin, and how is it configured?
The SS (soft-start) pin connects to an external capacitor that controls output voltage ramp rate during startup and provides compensation for the current-limit loop. A typical 1nF capacitor yields ~1ms soft-start time; larger values increase ramp time and improve current-limit loop phase margin.
Does MP2492DQ-LF-P require an external bootstrap diode?
An external bootstrap diode (e.g., BAT54) is recommended only for high-duty-cycle operation (VIN/VOUT > 65%), 5V-input systems, or outputs above 12V - where the internal bootstrap regulator may not fully recharge the BST capacitor. Most 12V-to-5V applications operate reliably without it.
What thermal considerations apply to the QFN10 package?
The QFN10 exposes a thermal pad that must be soldered to a minimum 100mm² copper pour connected to GND. With proper PCB layout (4-layer, 2oz copper), θJA is ~50°C/W - allowing 2A operation up to +85°C ambient. Derating is required above 70°C ambient without forced airflow or additional copper area.
Is PGOOD assertion dependent on output voltage accuracy or regulation status?
PGOOD asserts high only when FB voltage exceeds 0.72V (90% of 0.8V nominal), regardless of output voltage setpoint. It indicates feedback loop closure and basic regulation - not absolute output accuracy - and remains active during constant-current limiting if FB stays above threshold.
MP2492DQ-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):
- 55V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2492DQ-LF-P FAQ
1.How can I place an order for MP2492DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2492DQ-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 MP2492DQ-LF-P reliable?
The price and inventory of MP2492DQ-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 MP2492DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP2492DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2492DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2492DQ-LF-P?
MP2492DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2492DQ-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 MP2492DQ-LF-P?
For technical support, including MP2492DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2492DQ-LF-P requirements.
6.How does Aetrix verify that MP2492DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2492DQ-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 MP2492DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP2492DQ-LF-P?
All MP2492DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2492DQ-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 MP2492DQ-LF-P part is unused and in its original packaging.
Return procedure for MP2492DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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