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Monolithic Power Systems Inc. MPQ4321GDE-5-AEC1-P
- Part No.:
- MPQ4321GDE-5-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MPQ4321GDE-5-AEC1-P.pdf
- Description:
- IC REG BUCK ADJ 1A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MPQ4321GDE-5-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade-1 qualified, synchronous step-down DC/DC converter with integrated 70mΩ high-side and 50mΩ low-side MOSFETs, delivering 1A continuous output current. It operates from 3.3V to 36V input, withstands 42V automotive load dump transients, and features 1μA shutdown quiescent current. Designed for automotive infotainment and ADAS power rails, it supports cold-crank down to 3.1V VIN and includes power-good monitoring.
For engineers reviewing the MPQ4321GDE-5-AEC1-P datasheet, MPQ4321GDE-5-AEC1-P pinout, MPQ4321GDE-5-AEC1-P application, or MPQ4321GDE-5-AEC1-P equivalent, key selection criteria include its 42V load-dump tolerance, 1μA shutdown IQ, QFN-12 (2mm×3mm) wettable-flank package, fixed 5V output, and CISPR25 Class 5 EMI compliance in automotive environments.
Technical Context
The MPQ4321GDE-5-AEC1-P implements peak current mode control with frequency foldback during startup to prevent inductor current runaway. Its configurable switching frequency (350kHz–2.5MHz) enables optimization for efficiency or size, while spread-spectrum modulation and symmetric VIN pinout reduce conducted and radiated EMI.
It integrates advanced thermal protection (160°C–185°C shutdown), hiccup-mode over-current protection, and a dedicated low-dropout mode enabling stable regulation at ultra-low input voltages (e.g., 3.1V during cold crank). The fixed 5V output version eliminates external feedback resistors, simplifying layout and improving accuracy (±1.5% over –40°C to +150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V nominal; survives 42V transient load dump per ISO16750 - enables direct battery connection in 12V/24V automotive systems. |
| Output Voltage | Fixed 5.0V ±1.5% over –40°C to +150°C - eliminates external feedback divider, improves accuracy and board space efficiency. |
| Continuous Output Current | 1A - sufficient for powering microcontrollers, sensors, and display logic in automotive clusters and infotainment head units. |
| Quiescent Current | 1μA in shutdown, 20μA in sleep mode - extends battery life in always-on vehicle modules like telematics and remote keyless entry. |
| Switching Frequency | Configurable 350kHz–2.5MHz via external resistor - allows trade-off between inductor size (higher fSW) and light-load efficiency (lower fSW with AAM). |
| Thermal Protection | Thermal shutdown at 160°C–185°C with 20°C hysteresis - ensures fault-tolerant operation under sustained overload or poor heatsinking. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive EMC requirements without requiring complex external filtering. |
Pinout & Package
The MPQ4321GDE-5-AEC1-P is housed in a wettable-flank QFN-12 package measuring 2mm × 3mm, optimized for automated optical inspection (AOI) and robust solder joint reliability in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground reference | Low-inductance return path for high-current switching node; must be connected to solid ground plane beneath IC. |
| 2, 10 VIN | Main input supply | Dual pins reduce impedance and EMI; each requires local 1µF ceramic decoupling to PGND for stable gate drive and control circuitry. |
| 3 BOOT | High-side gate driver supply | Connected via 0.1µF capacitor to SW; enables bootstrap charging for high-side MOSFET conduction above VIN. |
| 4 FREQ | Frequency configuration | Resistor-to-ground sets switching frequency; 86.6kΩ yields 415kHz, 15kΩ yields 2.2MHz - enables EMI tuning and inductor selection. |
| 5 VCC | Bias regulator output | Internal 5V LDO output; requires ≥1µF ceramic capacitor to AGND for stable gate driver and control logic supply. |
| 6 AGND | Analog ground reference | Separate ground for FB, PG, EN; must be tied to PGND at single point near IC to minimize noise coupling into feedback path. |
| 7 FB | Feedback input | Internally connected to fixed 5V reference; not used in -5 variant - leave unconnected or tie to AGND per layout guidelines. |
| 8 PG | Power-good open-drain output | Asserts high when VOUT is within 94.5–105.5% of 5V; requires external pull-up to enable system power sequencing or fault reporting. |
| 9 EN | Enable control input | Active-high logic input; threshold ~1.02V rising, ~0.85V falling - no internal pull-up/down; must be actively driven. |
| 12 SW | Switch node | Connection point between high-side drain and low-side source; carries high di/dt; requires minimal loop area with input cap and inductor. |
Key Features
| Feature | Design Value |
|---|---|
| 42V Load Dump Tolerance | Withstands ISO16750-2 Pulse 5a transients without latch-up or degradation - eliminates need for upstream TVS clamping in cost-sensitive designs. |
| 1μA Shutdown Supply Current | Enables >10-year battery standby in always-on automotive modules (e.g., CAN wake-up receivers, intrusion detection) without compromising system longevity. |
| Wettable-Flank QFN-12 (2mm×3mm) | Facilitates automated optical inspection of solder joints on bottom leads - critical for zero-defect manufacturing in automotive Tier-1 supply chains. |
| Advanced Asynchronous Mode (AAM) | Reduces switching losses at light loads by dynamically lowering frequency - maintains >85% efficiency at 10mA output across full input range. |
| Fixed 5V Output with ±1.5% Accuracy | Guaranteed over –40°C to +150°C junction temperature - eliminates calibration overhead and improves system-level voltage margin for downstream logic. |
Applications
| Automotive Infotainment | Automotive Clusters |
|---|---|
Use Scenario: Powering SoC core logic, display interface, and audio codec in head-unit systems operating across battery voltage swings (6V–16V) and load dump events. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying clean, regulated power to MCU, GPU, and memory subsystems. Use Value: 42V tolerance and cold-crank support ensure uninterrupted operation during engine start-stop cycles and alternator faults. | Use Scenario: Providing stable 5V rail to digital instrumentation cluster microcontrollers and TFT-LCD timing controllers in harsh under-hood environments. IC Role / Device Role / Timing Role: High-reliability point-of-load converter with thermal shutdown and power-good signaling for safety-critical display subsystems. Use Value: Wettable-flank package and AEC-Q100 Grade-1 qualification guarantee long-term solder joint integrity and functional safety compliance. |
| Advanced Driver Assistance Systems | Industrial Power Systems |
Use Scenario: Powering radar sensor SoCs and camera ISP processors in ADAS ECUs where EMI emissions must meet CISPR25 Class 5 limits. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum synchronized buck converter feeding real-time vision processing pipelines. Use Value: Integrated EMI reduction features eliminate need for external ferrite beads or multi-stage filters - reducing BOM count and PCB area. | Use Scenario: Regulating 5V for industrial HMI panels and programmable logic controllers exposed to wide ambient temperatures (–40°C to +85°C) and voltage surges. IC Role / Device Role / Timing Role: Robust, high-efficiency DC/DC converter replacing discrete solutions in DIN-rail mounted equipment. Use Value: 150°C max junction temperature and 36V continuous operation enable reliable deployment in unventilated enclosures with high thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4321GDE-AEC1 | Adjustable output (0.8V–0.95×VIN); requires external feedback resistors; identical package, specs, and AEC-Q100 rating. | Suitable for designs needing non-standard output voltages (e.g., 3.3V, 2.5V) or dynamic voltage scaling. | Select when output flexibility outweighs layout simplicity; adds two resistors and routing complexity but retains all other performance. |
| TI LM61480QRNXTQ1 | 42V input, 1A, AEC-Q100 Grade 1, but higher 15μA shutdown IQ and no spread-spectrum modulation; uses 3mm×4mm QFN. | Lacks CISPR25 Class 5 certification out-of-box; requires additional EMI filtering for automotive EMC compliance. | Choose only if footprint compatibility with larger QFN is acceptable and EMI filter design resources are available. |
Compared with MPQ4321GDE-5-AEC1-P, the adjustable MPQ4321GDE-AEC1 offers voltage flexibility at the cost of added components, while the LM61480QRNXTQ1 trades lower EMI performance for TI's ecosystem support - making the MPQ4321GDE-5-AEC1-P optimal for compact, EMI-constrained 5V automotive rails.
Availability
MPQ4321GDE-5-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and instrument cluster power supplies requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for MPQ4321GDE-5-AEC1-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 power management ICs, with over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting solutions.
The MPQ4321 product line targets automotive-grade power conversion, emphasizing robustness against load dump, cold-crank, and EMI challenges - specifically engineered for safety-critical and always-on vehicle subsystems.
FAQ
What is the purpose of the FREQ pin on MPQ4321GDE-5-AEC1-P?
The FREQ pin sets the switching frequency via an external resistor to ground. With 86.6kΩ, it configures 415kHz; with 15kΩ, it achieves 2.2MHz. This allows designers to balance inductor size, light-load efficiency, and EMI performance without changing the IC or layout.
Does MPQ4321GDE-5-AEC1-P require external feedback resistors?
No. The "-5" suffix denotes a fixed 5V output version. The FB pin is internally connected to the 0.8V reference and trimmed for 5V regulation; it should be left unconnected or tied to AGND per MPS layout recommendations - eliminating resistor placement and tolerance errors.
How does the wettable-flank QFN package benefit automotive manufacturing?
The wettable flanks on the QFN-12 (2mm×3mm) package expose solderable sidewalls, enabling automated optical inspection (AOI) of solder joint quality. This is mandatory for zero-defect requirements in automotive Tier-1 production, improving process yield and field reliability.
Can MPQ4321GDE-5-AEC1-P operate during automotive cold-crank conditions?
Yes. It supports minimum input voltage of 3.1V after startup and includes a dedicated low-dropout mode that maintains regulation even when VIN drops below VOUT. This ensures uninterrupted power to critical ECUs during engine cranking, where battery voltage can fall to 3.2V.
What protection features are integrated into MPQ4321GDE-5-AEC1-P?
It integrates hiccup-mode over-current protection, thermal shutdown (160°C–185°C), input over-voltage protection (35.5V–40V), under-voltage lockout (3.4V rising), and frequency foldback at startup. These features prevent damage during fault conditions without requiring external circuitry.
Is MPQ4321GDE-5-AEC1-P certified to CISPR25 Class 5?
Yes. The device meets CISPR25 Class 5 limits for both conducted and radiated emissions (150kHz–1GHz) when used with the recommended application circuit and EMI filters. Spread-spectrum modulation and symmetric VIN pinout are key enablers of this certification.
What is the maximum junction temperature rating?
The absolute maximum operating junction temperature is +150°C, and thermal shutdown activates between 160°C and 185°C. This allows safe operation in under-hood environments where ambient temperatures exceed 105°C, provided PCB thermal design meets θJA ≤ 60°C/W.
MPQ4321GDE-5-AEC1-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- 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):
- 34.2V
- Current - Output:
- 1A
- Frequency - Switching:
- 350kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-QFN (2x3)
MPQ4321GDE-5-AEC1-P FAQ
1.How can I place an order for MPQ4321GDE-5-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4321GDE-5-AEC1-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 MPQ4321GDE-5-AEC1-P reliable?
The price and inventory of MPQ4321GDE-5-AEC1-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4321GDE-5-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ4321GDE-5-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4321GDE-5-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4321GDE-5-AEC1-P?
MPQ4321GDE-5-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4321GDE-5-AEC1-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 MPQ4321GDE-5-AEC1-P?
For technical support, including MPQ4321GDE-5-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4321GDE-5-AEC1-P requirements.
6.How does Aetrix verify that MPQ4321GDE-5-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ4321GDE-5-AEC1-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 MPQ4321GDE-5-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ4321GDE-5-AEC1-P?
All MPQ4321GDE-5-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4321GDE-5-AEC1-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 MPQ4321GDE-5-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ4321GDE-5-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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