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Monolithic Power Systems Inc. MPQ4423HGQ-AEC1-Z
- Part No.:
- MPQ4423HGQ-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MPQ4423HGQ-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,439
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Product details
Overview
MPQ4423HGQ-AEC1-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter delivering 3A continuous output current, operating from 4V to 36V input, with AEC-Q100 Grade 1 qualification for automotive use. It integrates 85mΩ/55mΩ high-side/low-side MOSFETs, features 410kHz default switching frequency, internal soft-start, and power-good signaling - deployed in engine control units and ADAS camera power rails.
For engineers reviewing the MPQ4423HGQ-AEC1-Z datasheet, MPQ4423HGQ-AEC1-Z pinout, MPQ4423HGQ-AEC1-Z application, or MPQ4423HGQ-AEC1-Z equivalent, key selection criteria include cold-crank support (95% max duty cycle), thermal shutdown at 170°C, hiccup-mode OCP, and QFN-8 wettable flank package compatibility with automotive reflow and optical inspection.
Technical Context
The MPQ4423HGQ-AEC1-Z uses peak-current-mode control with fixed-frequency PWM operation, enabling fast transient response and stable loop behavior without external compensation. Its integrated bootstrap driver supports high-duty-cycle operation during automotive cold-crank (VIN as low as 4V), while internal 5V VCC regulator powers all circuitry across full input range.
Power-good (PG) logic monitors FB voltage against 90% and 84% of 0.792V reference with 90μs rising delay and 55μs falling delay; EN/SYNC pin serves dual function - digital enable and external clock synchronization from 200kHz to 2.2MHz - allowing EMI optimization in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports automotive battery transients including cold-crank down to 4.5V and load dump up to 36V. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, image sensors, and CAN transceivers in Tier-1 modules. |
| Switching Frequency | 410kHz default, synchronizable 200kHz–2.2MHz - enables layout optimization and EMI compliance in dense PCBs. |
| Feedback Reference | 0.792V ±12mV - sets precise output voltage via resistor divider; enables 0.8V–34.2V adjustable output range. |
| Thermal Shutdown | 170°C activation, 30°C hysteresis - protects against sustained overload while allowing recovery at 140°C without system reset. |
| OCP Threshold | 3.2A–5.7A (typ. 4.4A) - cycle-by-cycle current limiting prevents MOSFET failure during short-circuit events. |
| Package | QFN-8 (3mm×3mm) with wettable flanks - supports automated optical inspection (AOI) and improves solder joint reliability in automotive assembly. |
Pinout & Package
MPQ4423HGQ-AEC1-Z is housed in a thermally enhanced, lead-free QFN-8 (3mm×3mm) package with wettable flanks for solder joint inspection. Exposed thermal pad on underside requires direct connection to PCB ground plane for optimal thermal performance (θJC = 13°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider tap; regulates output by comparing against 0.792V internal reference; triggers fold-back frequency reduction below 660mV during fault. |
| 2 VCC | Bias Supply Rail | Internal 5V regulator output; powers control circuitry; requires 0.1µF–0.22µF ceramic decoupling capacitor placed adjacent to pin. |
| 3 EN/SYNC | Enable & Clock Input | Logic-high (>1.4V) enables regulation; external 200kHz–2.2MHz clock synchronizes switching edge; internal 500kΩ pull-down allows floating shutdown. |
| 4 BST | Bootstrap Supply | Drives high-side MOSFET gate; requires 0.1µF capacitor between BST and SW; 20Ω series resistor recommended to suppress SW node ringing. |
| 5 GND | Power & Signal Ground | Reference for output voltage and internal circuits; must connect directly to large copper pour with multiple vias to minimize noise coupling. |
| 6 SW | Switch Node | High-frequency switching output connecting to inductor; requires wide copper trace and minimal loop area to reduce EMI and voltage spikes. |
| 7 IN | Main Input Supply | Accepts 4V–36V DC input; requires bulk + high-frequency ceramic input capacitors placed near pin to handle pulsed current and suppress ripple. |
| 8 PG | Power-Good Open Drain | Asserts high when VOUT ≥90% of target (e.g., ≥2.97V for 3.3V output); pulled low during startup, OCP, thermal shutdown, or EN deactivation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q100 Grade 1 (−40°C to +125°C TJ) - qualified for engine bay and front-end ADAS applications without derating. |
| High-Duty-Cycle Operation | 95% max duty cycle - maintains regulation during automotive cold-crank events where VIN drops to ~4.5V while VOUT remains stable. |
| Integrated Power MOSFETs | 85mΩ HS / 55mΩ LS RDS(ON) - eliminates external FETs and gate drivers, reducing BOM count and board space in compact ECUs. |
| Power-Save Mode | Automatic transition to pulse-frequency modulation at light loads - maintains >85% efficiency down to 1mA output current. |
| Robust Protection Suite | OCP with hiccup mode, thermal shutdown, UVLO (3.5V rising), and PG monitoring - enables autonomous fault recovery without host intervention. |
Applications
| Engine Control Unit (ECU) Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers 32-bit MCU, CAN FD transceiver, and analog front-end in gasoline/diesel engine control units exposed to under-hood temperatures and battery transients. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator; provides regulated rail with <1% line/load regulation and <100mV startup overshoot. Use Value: Cold-crank support ensures uninterrupted MCU operation during cranking (VIN ≥4.5V); PG signal enables safe firmware boot sequencing before peripheral initialization. | Use Scenario: Supplies image sensor, ISP, and gigabit Ethernet PHY in forward-facing radar-camera fusion modules requiring low-noise, high-reliability power. IC Role / Device Role / Timing Role: Synchronous buck converter generating 1.8V/3.3V rails; operates at 2.1MHz to avoid AM radio band interference. Use Value: Wettable flank QFN enables AOI verification of solder joints; hiccup-mode OCP prevents thermal runaway during lens motor stall faults. |
| Infotainment Head Unit Core Rail | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Delivers clean 1.1V core voltage to application processor and 3.3V I/O rail to touch controller and display interface in automotive infotainment systems. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with internal soft-start (1.5ms) and precise PG assertion to coordinate multi-rail power sequencing. Use Value: 410kHz switching frequency balances efficiency and filter size; low quiescent current (0.7mA) extends battery runtime in accessory mode. | Use Scenario: Powers torque sensor signal conditioning, microcontroller, and CAN transceiver in electric power steering control modules subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Safety-relevant power supply with AEC-Q100 Grade 1 qualification; PG output feeds watchdog timer to detect undervoltage conditions. Use Value: Thermal shutdown at 170°C prevents latch-up during prolonged overtemperature; EN/SYNC pin allows synchronized switching with other regulators to reduce system-level ripple. |
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 |
|---|---|---|---|
| LM61480QPWPRQ1 | 4.5V–36V input, 8A output, 2.1MHz default fSW, no integrated BST resistor recommendation | Higher current capacity; targets ADAS domain controllers rather than compact sensor nodes | Select when >3A output or higher switching frequency is required; requires external BST resistor design validation. |
| TPS543320RPYR | 4.5V–18V input, 3A output, PMBus interface, 500kHz–2MHz programmable fSW | Digital control adds telemetry but increases BOM cost and firmware dependency | Choose only if real-time telemetry (VOUT, IOUT, temperature) and dynamic margining are mandatory for functional safety compliance. |
Compared with LM61480QPWPRQ1 and TPS543320RPYR, MPQ4423HGQ-AEC1-Z offers optimal balance of AEC-Q100 Grade 1 assurance, wettable flank package, and minimal external component count - making it preferred for cost-sensitive, space-constrained automotive subsystems where analog simplicity and proven field reliability are prioritized over digital configurability or ultra-high current.
Availability
MPQ4423HGQ-AEC1-Z is available at Aetrix Electronics and suitable for automotive ECU power, ADAS camera modules, infotainment core rails, and EPS sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MPQ4423HGQ-AEC1-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 MPQ4423H product line delivers AEC-Q100-qualified synchronous buck converters optimized for automotive power systems - emphasizing cold-crank resilience, thermal robustness, and minimal external component requirements in harsh environments.
FAQ
What is the minimum input voltage required for reliable startup under cold-crank conditions?
The MPQ4423HGQ-AEC1-Z starts reliably at 4V input due to its high-duty-cycle capability (95% max) and internal bootstrap charging architecture. During cold-crank, VIN may dip to ~4.5V while maintaining regulated output - verified per AEC-Q100 transient test profiles. Startup is guaranteed when both VIN > 4V and EN > 1.4V are met simultaneously.
Does the device support forced PWM mode, or does it automatically enter power-save mode at light loads?
The MPQ4423HGQ-AEC1-Z operates exclusively in forced PWM mode - no automatic pulse-skipping or burst-mode transitions. This ensures constant switching frequency and predictable EMI profile across all load conditions from 0 to 3A, critical for automotive EMC compliance and timing-sensitive peripherals.
How is the power-good (PG) threshold calibrated, and can it be adjusted externally?
PG asserts high when FB voltage reaches 90% of the internal 0.792V reference (i.e., 713mV), with 6% hysteresis (6% of 0.792V = 48mV). The threshold is factory-trimmed and not user-adjustable; however, output voltage scaling via feedback resistors indirectly shifts the absolute PG trip point proportionally.
What is the maximum allowable PCB trace length between BST and SW pins, and why is the 20Ω resistor recommended?
Trace length between BST and SW must be ≤2mm to minimize parasitic inductance. The 20Ω resistor dampens ringing caused by LC resonance between BST capacitance and PCB inductance, reducing SW node overshoot by up to 40% - validated in MPS application note AN-107. Omitting it risks false triggering of overvoltage protection.
Is the QFN-8 wettable flank variant compatible with standard lead-free reflow profiles used in automotive manufacturing?
Yes - the MPQ4423HGQ-AEC1-Z (wettable flank) is qualified for IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C. The flank geometry ensures consistent solder fillet formation visible under AOI, meeting IATF 16949 process validation requirements for zero-defect solder joints.
Can the EN/SYNC pin be used to implement a hardware reset sequence independent of input voltage?
Yes - EN/SYNC accepts logic-level signals referenced to GND, independent of VIN. Driving EN low forces immediate shutdown regardless of input voltage level, and releasing it initiates soft-start. This enables deterministic power sequencing controlled by microcontroller GPIO, even during brown-out conditions.
What is the thermal resistance from junction-to-board (θJB) for the QFN-8 package, and how does it impact heatsinking strategy?
θJB is 13°C/W (measured per JESD51-7 on 4-layer board with 1-in² 2oz copper pad under exposed thermal pad). For 3A operation at 12V→3.3V, power dissipation is ~1.2W - resulting in ~15.6°C rise above board temperature. No external heatsink is needed; ensure ≥6 thermal vias (0.3mm diameter) connect the pad to inner ground planes.
MPQ4423HGQ-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-VDFN
- 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 3A
- Frequency - Switching:
- 410kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
MPQ4423HGQ-AEC1-Z FAQ
1.How can I place an order for MPQ4423HGQ-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4423HGQ-AEC1-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 MPQ4423HGQ-AEC1-Z reliable?
The price and inventory of MPQ4423HGQ-AEC1-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4423HGQ-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4423HGQ-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4423HGQ-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4423HGQ-AEC1-Z?
MPQ4423HGQ-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4423HGQ-AEC1-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 MPQ4423HGQ-AEC1-Z?
For technical support, including MPQ4423HGQ-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4423HGQ-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4423HGQ-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4423HGQ-AEC1-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 MPQ4423HGQ-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4423HGQ-AEC1-Z?
All MPQ4423HGQ-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4423HGQ-AEC1-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 MPQ4423HGQ-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4423HGQ-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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