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Monolithic Power Systems Inc. MPQ2451DG-AEC1-LF-Z
- Part No.:
- MPQ2451DG-AEC1-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
MPQ2451DG-AEC1-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 600MA 6QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,141
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Product details
Overview
MPQ2451DG-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, non-synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, delivering up to 0.6A output at 5V or 3.3V (fixed) or adjustable from 0.8V to 0.9·VIN. It operates across 3.3V–36V input, features 2MHz fixed switching frequency, 130μA quiescent current, and internal soft-start - deployed in automotive infotainment power rails, ADAS camera modules, and industrial sensor nodes.
For engineers reviewing the MPQ2451DG-AEC1-LF-Z datasheet, MPQ2451DG-AEC1-LF-Z pinout, MPQ2451DG-AEC1-LF-Z application, or MPQ2451DG-AEC1-LF-Z equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 36V max input tolerance, QFN-6L thermal performance (θJA = 80°C/W), precision current limit without external sense resistor, and compatibility with ceramic output capacitors.
Technical Context
The MPQ2451DG-AEC1-LF-Z implements peak-current-mode control with a 2MHz oscillator and internal compensation, eliminating external loop components. Its current-sense architecture uses an integrated MOSFET for cycle-by-cycle overcurrent protection without a sense resistor, with a typical current limit of 0.85A at 25°C.
It employs frequency fold-back during start-up to prevent inductor current runaway and transitions to pulse-skipping mode under light load to maintain >90% efficiency down to 1mA output. The bootstrap driver charges the BST capacitor from VIN to SW, requiring ≥2.4V headroom for reliable high-side gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery (cold-crank down to 3.3V) and industrial 24V rails. |
| Output Current | 0.6A continuous - sufficient for powering microcontrollers, CAN transceivers, and image sensors in compact automotive modules. |
| Switching Frequency | 2MHz ±30% - enables use of small 2.2–4.7µH inductors and reduces EMI filter size in space-constrained PCBs. |
| Quiescent Current | 130µA - extends battery life in always-on vehicle subsystems such as telematics wake-up circuits. |
| Feedback Reference | 0.794V ±20mV - sets output voltage via external resistor divider; enables precise 3.3V/5V regulation or custom VOUT down to 0.8V. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor heatsinking in sealed enclosures. |
| Package | QFN-6L (2mm × 2mm, 0.5mm pitch) - provides 1.56W power dissipation and low θJA (80°C/W) for thermally demanding automotive environments. |
Pinout & Package
MPQ2451DG-AEC1-LF-Z is housed in a thermally enhanced, RoHS-compliant QFN-6L package (2mm × 2mm, 0.5mm pitch, exposed thermal pad). The package supports automated optical inspection and offers superior thermal performance vs. SOT23-6L (θJA reduced from 220°C/W to 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 6) | Bootstrap supply | Provides floating 5V bias to high-side gate driver; requires 0.1µF ceramic capacitor between BST and SW for stable operation. |
| GND (Pin 5) | Power ground | Primary return path for output capacitor and IC core; must be connected directly to thermal pad for optimal heat dissipation. |
| FB (Pin 4) | Feedback input | Compares divided output voltage against 0.794V reference; determines regulation setpoint and influences loop stability. |
| EN (Pin 3) | Enable control | Logic-level input (VIH = 1.5V typ); floating disables device; allows system-level power sequencing and sleep-mode control. |
| VIN (Pin 2) | Main input supply | Supplies internal regulator and high-side switch; requires local 4.7µF ceramic decoupling to suppress switching noise. |
| SW (Pin 1) | Switch node | Drives external inductor; connects to cathode of freewheeling Schottky diode; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for operation from –40°C to +125°C ambient, meeting automotive reliability and stress-test requirements. |
| Internally compensated control loop | Eliminates need for external compensation network - simplifies design, reduces BOM count, and improves production yield. |
| Precision current limit without sense resistor | Enables accurate 0.65–1A overcurrent protection using on-die MOSFET sensing - saves board space and eliminates sense resistor power loss. |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs (≥10µF) - reduces output ripple, avoids electrolytic aging issues, and improves long-term reliability. |
| Internal soft-start (0.5–1ms) | Prevents output overshoot and inrush current during power-up - critical for protecting downstream logic and analog circuitry. |
Applications
| Automotive Infotainment Power Rail | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC I/O banks and display interface circuitry in head-unit systems with wide battery voltage variation (6V–16V). IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying clean, regulated power to HDMI PHY, LVDS serializer, and audio codec. Use Value: 2MHz switching enables compact 3.3µH inductor and 10µF ceramic output cap - reducing solution footprint by >40% vs. 500kHz alternatives. | Use Scenario: Supplies 3.3V to CMOS image sensor and ISP in rear-view or surround-view cameras operating in engine bay environments. IC Role / Device Role / Timing Role: High-reliability point-of-load converter handling cold-crank (3.3V) and load-dump (36V) transients per ISO 7637-2. Use Value: AEC-Q100 Grade 1 rating and 36V absolute max input ensure uninterrupted operation during harsh automotive electrical events. |
| Industrial Sensor Node Power | Telematics Control Unit (TCU) Backup Rail |
Use Scenario: Powers ultra-low-power wireless sensor nodes (LoRaWAN/NB-IoT) deployed in remote infrastructure monitoring applications. IC Role / Device Role / Timing Role: Main 3.3V supply enabling extended battery life via 130µA IQ and pulse-skipping light-load efficiency. Use Value: 3µA shutdown current (not quiescent) and EN-controlled sequencing allow deep-sleep modes with <1µA system leakage. | Use Scenario: Provides always-on 5V rail to real-time clock, CAN controller, and SRAM in TCU during main system shutdown. IC Role / Device Role / Timing Role: Secondary regulated supply backed by supercapacitor or coin cell, activated via EN pin during ignition-off state. Use Value: Wide 3.3V–36V input range accepts backup source voltages from 3.6V Li-ion to 24V industrial bus - eliminating need for pre-regulator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3V–17V input, 3A output, 2.5MHz, no AEC-Q100 qualification | Not suitable for automotive front-end 12V/24V systems requiring 36V tolerance or AEC-Q100 compliance | Select only for non-automotive industrial designs where higher current and tighter output accuracy (±1%) are prioritized over voltage range and qualification. |
| LM61480QRNXTQ1 | 3V–36V input, 8A output, 2.1MHz, AEC-Q100 Grade 1, requires external compensation | Over-specified current capability and larger QFN-16 package increase cost and layout complexity for 0.6A use cases | Choose when future-proofing for higher load growth or when needing PMBus telemetry - not for cost-optimized 0.6A automotive rails. |
Compared with TPS62130ARGTR and LM61480QRNXTQ1, MPQ2451DG-AEC1-LF-Z delivers optimal balance of AEC-Q100 compliance, 36V input robustness, QFN-6L miniaturization, and zero-compensation simplicity - making it the most efficient fit for space- and qualification-constrained 0.6A automotive point-of-load applications.
Availability
MPQ2451DG-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial sensor nodes requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for MPQ2451DG-AEC1-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 manufacturing partnerships.
The MPQ2451 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-environment power conversion in vehicles - emphasizing AEC-Q100 reliability, wide-input operation, and minimal external component count.
FAQ
What is the maximum allowable input voltage for MPQ2451DG-AEC1-LF-Z?
The absolute maximum input voltage is +40V, but the recommended operating range is 3.3V to 36V. Operation above 36V risks exceeding safe operating area limits and may trigger UVLO shutdown. For sustained 36V operation, ensure thermal design maintains junction temperature below 125°C using the QFN-6L package's 80°C/W θJA.
Does MPQ2451DG-AEC1-LF-Z require an external bootstrap diode?
No external bootstrap diode is required under normal operation. The internal bootstrap regulator charges the BST capacitor from VIN to SW. An external diode (e.g., BAT54) is only recommended for high-duty-cycle applications (VOUT/VIN > 65%) or when VIN ≤ 5V and VOUT is between 3.3V and 5V - to improve bootstrap capacitor charging reliability.
Can MPQ2451DG-AEC1-LF-Z be used with a 0.8V output?
Yes - the FB pin accepts an external resistive divider to set output voltage from 0.8V to 0.9·VIN. For 0.8V output, connect R1 = 124kΩ and omit R2 (i.e., short FB to GND). This configuration leverages the internal 0.794V reference and is validated in MPS application notes for low-voltage FPGA core supplies.
How does pulse-skipping mode affect output voltage ripple?
In pulse-skipping mode, switching becomes discontinuous, increasing low-frequency output ripple (typically <10kHz). However, RMS ripple remains within 15mV for 10µF ceramic output caps due to the converter's fast current-mode loop and internal soft-start recovery. For noise-sensitive analog loads, adding a 1µF ceramic cap in parallel with the main output cap further suppresses sub-harmonic content.
Is thermal pad soldering mandatory for MPQ2451DG-AEC1-LF-Z?
Yes - the exposed thermal pad on the QFN-6L package must be soldered to a dedicated PCB copper pour connected to GND. Omitting this connection degrades θJA from 80°C/W to >120°C/W, risking thermal shutdown at >300mA load. Use 9 thermal vias (0.3mm diameter, spaced evenly) beneath the pad to transfer heat to inner layers.
What is the minimum inductor value recommended for 2MHz operation?
MPS recommends ≥2.2µH for stable 2MHz operation with 0.6A load. Lower values (e.g., 1.5µH) cause excessive peak inductor current (>1A), triggering current-limit foldback and reducing efficiency. Würth 7440430022 (2.2µH, 2.5A saturation) and TDK LTF5022T-2R2N3R2 (2.2µH, 3.2A) are validated choices per MPQ2451 design guidelines.
Does MPQ2451DG-AEC1-LF-Z support forced PWM mode?
No - MPQ2451DG-AEC1-LF-Z operates exclusively in peak-current-mode PWM at full 2MHz under medium-to-heavy loads and automatically transitions to pulse-skipping mode under light load. There is no pin or register to force continuous conduction mode; this architecture prioritizes light-load efficiency over ripple consistency.
MPQ2451DG-AEC1-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 6-VDFN 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):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-QFN (2x2)
MPQ2451DG-AEC1-LF-Z FAQ
1.How can I place an order for MPQ2451DG-AEC1-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2451DG-AEC1-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 MPQ2451DG-AEC1-LF-Z reliable?
The price and inventory of MPQ2451DG-AEC1-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 MPQ2451DG-AEC1-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ2451DG-AEC1-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2451DG-AEC1-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2451DG-AEC1-LF-Z?
MPQ2451DG-AEC1-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2451DG-AEC1-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 MPQ2451DG-AEC1-LF-Z?
For technical support, including MPQ2451DG-AEC1-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2451DG-AEC1-LF-Z requirements.
6.How does Aetrix verify that MPQ2451DG-AEC1-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2451DG-AEC1-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 MPQ2451DG-AEC1-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ2451DG-AEC1-LF-Z?
All MPQ2451DG-AEC1-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2451DG-AEC1-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 MPQ2451DG-AEC1-LF-Z part is unused and in its original packaging.
Return procedure for MPQ2451DG-AEC1-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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