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Monolithic Power Systems Inc. MP2492DQ-LF-Z
- Part No.:
- MP2492DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2492DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,425
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Product details
Overview
MP2492DQ-LF-Z from Monolithic Power Systems is a monolithic 100kHz step-down DC/DC converter with programmable output current limit, designed for automotive and industrial power supplies. It delivers 2A continuous output over 4.5V–55V input, supports 0.8V–15V adjustable output, integrates a 0.25Ω internal MOSFET, and features cycle-by-cycle current limiting and thermal shutdown - used in USB power adapters and linear charger supplies.
For engineers reviewing the MP2492DQ-LF-Z datasheet, MP2492DQ-LF-Z pinout, MP2492DQ-LF-Z application, or MP2492DQ-LF-Z equivalent, key selection criteria include its 55V max input rating, DCR- or resistor-based current limit programming, QFN10 (3mm × 3mm) package with exposed thermal pad, fixed-frequency current-mode control, and PGOOD open-drain status signal.
Technical Context
The MP2492DQ-LF-Z implements a current-mode buck architecture with a fixed 100kHz oscillator, internal error amplifier, ramp compensation, and dual-path current sensing via ISP/ISN pins. Its feedback reference is tightly regulated at 0.8V ±2%, and output voltage is set by an external resistor divider connected to FB.
Current limiting is enforced by comparing the sensed voltage across ISP–ISN (target 100mV) against the error amplifier output; when exceeded, the SS pin is pulled down to clamp duty cycle. The device uses bootstrap gate drive (BST–SW) for high-side MOSFET control and includes under-voltage lockout (3.3V threshold) and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports wide-range inputs including automotive battery (9–16V) and industrial 24/48V rails without pre-regulation. |
| Output Current | 2A continuous - sustained delivery enabled by low RDS(ON) (0.25Ω) internal MOSFET and QFN10 thermal design. |
| Switching Frequency | Fixed 100kHz - simplifies EMI filtering and enables use of standard low-cost inductors with predictable core loss. |
| Feedback Reference | 0.8V ±2% - sets precise output regulation; allows 0.8V–15V output via external resistor divider on FB pin. |
| Current Sense Threshold | 100mV ±10mV - defines programmable output current limit; compatible with DCR sensing or discrete sense resistors. |
| Thermal Shutdown | 150°C junction - protects die during overload or poor PCB thermal layout; auto-recovery after cooldown. |
| PGOOD Accuracy | ±5% window around 90% of VFB - provides reliable power-good assertion for downstream sequencing and fault detection. |
Pinout & Package
MP2492DQ-LF-Z is housed in a thermally enhanced QFN10 (3mm × 3mm) package with an exposed thermal pad that must be soldered to PCB ground for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power Input | Main unregulated supply input (4.5–55V); also powers internal circuitry and serves as drain node for internal MOSFET. |
| 2 GND | Ground Reference | System ground reference and thermal pad connection point; must be low-impedance, isolated from noisy switching return paths. |
| 3 EN | Enable Control | Logic-level input (1.8V high, 0.4V low) enabling/disabling regulator operation; supports sequencing and standby modes. |
| 4 FB | Feedback Input | Resistor-divider tap point for output voltage regulation; referenced to 0.8V internal bandgap; determines loop stability. |
| 5 SS | Soft-Start & Compensation | Connects external capacitor to control startup slew rate and provide compensation for current-limit loop dynamics. |
| 6 ISN | Negative Current Sense | Low-side current sense input; paired with ISP to measure differential voltage across sense element or inductor DCR. |
| 7 ISP | Positive Current Sense | High-side current sense input; forms 100mV threshold comparator with ISN for programmable constant-current regulation. |
| 8 PGOOD | Power-Good Output | Open-drain status signal asserted high when output is within ±5% of target; requires external pull-up for system monitoring. |
| 9 BST | Bootstrap Supply | Connects external capacitor between BST and SW to generate gate drive voltage above VIN for internal high-side MOSFET. |
| 10 SW | Switch Node | Drain-source switching node of internal MOSFET; connects to inductor; carries high di/dt current and requires tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Current Limit | Set precisely to 2A (or lower) using either inductor DCR or a discrete sense resistor - eliminates external current-sense IC and associated power loss. |
| Low-EMI Switching Edges | Controlled rise/fall times (50ns each at 12V/5V/2A) reduce high-frequency spectral content - eases compliance with CISPR 25 Class 5 in automotive designs. |
| Stable with Ceramic Output Capacitors | Compatible with low-ESR X5R/X7R MLCCs - avoids need for electrolytic capacitors and improves reliability and temperature stability. |
| Integrated 0.25Ω Power MOSFET | Reduces BOM count and board space; enables high efficiency (>85% at 2A, 12V→5V) without external switch or driver. |
| Thermal Shutdown + Cycle-by-Cycle OCP | Dual-layer protection: fast per-cycle current limiting prevents inductor saturation, while thermal shutdown guards against sustained overload or poor heatsinking. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 12V vehicle battery powering 5V/2A USB-A or USB-C PD sink ports. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V output with programmable current limit to prevent fuse blowout during hot-plug events. Use Value: Eliminates need for external current-sense amplifiers and enables compact, cost-effective adapter designs compliant with USB BC 1.2 charge profiles. |
Use Scenario: Aftermarket car chargers converting 9–16V battery to 5V/3.3V for mobile devices and accessories. IC Role / Device Role / Timing Role: High-input-voltage buck controller managing load transients during engine cranking (up to 55V load dump). Use Value: 55V absolute maximum input rating and robust UVLO hysteresis ensure uninterrupted operation during cold-crank and alternator surge conditions. |
| Linear Charger Power Supplies | Industrial 24V-to-5V Conversion |
|
Use Scenario: Pre-regulator stage feeding a linear charger IC (e.g., TP4056) in portable medical or IoT devices. IC Role / Device Role / Timing Role: Constant-current-limited intermediate supply ensuring safe, controlled charging current into Li-ion battery packs. Use Value: Programmable current limit replaces discrete current-setting resistors and enables dynamic adjustment via microcontroller-controlled DCR sensing. |
Use Scenario: DIN-rail mounted PLC I/O modules requiring clean, isolated 5V logic rail from 24V field supply. IC Role / Device Role / Timing Role: Non-isolated buck converter providing regulated 5V at up to 2A with minimal external components and low standby current. Use Value: 500µA quiescent current and stable operation down to 4.5V input enable reliable start-up even during brownout conditions on 24V bus. |
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 | Lower 1.5A output current rating; identical 4.5–55V input range and 100kHz frequency; shares same QFN10 footprint but reduced thermal capability. | Suitable for <1.5A loads where full 2A headroom is unnecessary; less derating required at elevated ambient temperatures. | Select when output current demand is ≤1.5A and cost optimization is prioritized over margin. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 1A output, 4.5–65V input, 100kHz–2.2MHz programmable frequency; requires external MOSFETs and more external components. | Required for ASIL-B functional safety systems; supports higher input voltages and flexible frequency tuning for EMI optimization. | Choose only when AEC-Q100 qualification, extended input range beyond 55V, or frequency agility are mandatory. |
Compared with MP2491DQ-LF-Z, the MP2492DQ-LF-Z delivers 33% higher output current in the same package; versus LM5164QDDARQ1, it offers integrated FETs and simpler BOM at the expense of automotive qualification and frequency flexibility.
Availability
MP2492DQ-LF-Z is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and linear charger power supplies requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2492DQ-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 mixed-signal ICs for power management, motion control, and interface applications.
The MP2492 belongs to MPS's high-voltage buck converter product line, engineered for rugged industrial and automotive environments where wide input range, programmable current limiting, and minimal external component count are critical design requirements.
FAQ
What is the maximum allowable input voltage for MP2492DQ-LF-Z?
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 sustained operation above 55V voids guaranteed performance per the datasheet's Recommended Operating Conditions table.
Can MP2492DQ-LF-Z operate with ceramic output capacitors only?
Yes - the MP2492DQ-LF-Z is explicitly characterized and stabilized with low-ESR ceramic capacitors (X5R/X7R). Its control loop compensates for zero-ESR behavior, eliminating the need for aluminum or tantalum capacitors and improving reliability across temperature and lifetime.
How is output current limit programmed using inductor DCR?
Current limit is set by the voltage drop across inductor DCR sensed differentially at ISP and ISN. With a target sense voltage of 100mV, the limit is ILIM = 100mV / DCR. An RC network (Ra, Rb, CR) filters DCR noise and matches time constants to avoid false triggering during transients.
What is the purpose of the SS pin beyond soft-start?
The SS pin serves dual functions: (1) soft-start by controlling ramp-up of internal reference voltage during startup, and (2) dynamic compensation node for the current-limit loop - pulling SS low during overcurrent events directly reduces duty cycle to enforce constant-current regulation.
Does MP2492DQ-LF-Z require an external bootstrap diode?
An external bootstrap diode (e.g., BAT54) is recommended for high-duty-cycle operation (VOUT/VIN > 65%), 5V-input systems, or outputs >12V to ensure sufficient BST capacitor recharge and prevent high-side MOSFET dropout; it is not mandatory for 12V→5V operation but improves efficiency margin.
Is the exposed thermal pad electrically connected internally?
Yes - the exposed pad on the QFN10 package is internally tied to GND. It must be soldered to a dedicated PCB ground plane with multiple thermal vias to meet θJA = 50°C/W and sustain 2A continuous operation at +85°C ambient.
What happens when PGOOD goes low during operation?
PGOOD asserts low when the FB voltage falls below 90% of 0.8V (i.e., <0.72V), indicating undervoltage on the output due to overload, short circuit, or input dropout. This open-drain signal can halt downstream systems or trigger fault logging, but does not disable the regulator itself.
MP2492DQ-LF-Z 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-Z FAQ
1.How can I place an order for MP2492DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2492DQ-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 MP2492DQ-LF-Z reliable?
The price and inventory of MP2492DQ-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 MP2492DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2492DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2492DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2492DQ-LF-Z?
MP2492DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2492DQ-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 MP2492DQ-LF-Z?
For technical support, including MP2492DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2492DQ-LF-Z requirements.
6.How does Aetrix verify that MP2492DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2492DQ-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 MP2492DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2492DQ-LF-Z?
All MP2492DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2492DQ-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 MP2492DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP2492DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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