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Monolithic Power Systems Inc. MPQ4423AGQ-AEC1-Z
- Part No.:
- MPQ4423AGQ-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MPQ4423AGQ-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:28,901
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Product details
Overview
MPQ4423AGQ-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering 3A continuous output current with 4V–36V input range, 0.8V–32.4V adjustable output, and 410kHz default switching frequency. It integrates 85mΩ/55mΩ high- and low-side MOSFETs and operates in forced CCM mode for stable automotive power rail regulation.
For engineers reviewing the MPQ4423AGQ-AEC1-Z datasheet, MPQ4423AGQ-AEC1-Z pinout, MPQ4423AGQ-AEC1-Z application, or MPQ4423AGQ-AEC1-Z equivalent, this device supports cold-crank operation (95% max duty cycle), features power-good signaling, thermal shutdown, hiccup-mode OCP, and external clock synchronization from 200kHz to 2.2MHz - critical for EMI-sensitive automotive infotainment and ADAS subsystems.
Technical Context
The MPQ4423AGQ-AEC1-Z employs peak-current-mode control with internal compensation, enabling fast transient response and simplified loop stability without external type-II/III networks. Its integrated bootstrap driver supports high-duty-cycle operation during automotive cold-crank events (VIN down to 4V) while maintaining gate drive integrity via BST capacitor charging through dedicated internal regulator and SW/BST path management.
It implements dual-threshold UVLO (3.5V rising / 3.3V falling) referenced to VCC, not VIN, ensuring reliable startup across battery voltage sag. The PG pin provides open-drain status with 90% VFB rising threshold and 84% VFB falling threshold, plus active-low assertion during thermal shutdown or EN deactivation - enabling robust system-level power sequencing and fault reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports full automotive battery range including cold-crank (4.5V) and load-dump (36V) transients. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in distributed ECUs. |
| Switching Frequency | Default 410kHz, synchronizable 200kHz–2.2MHz - enables EMI optimization and avoids AM band interference. |
| Feedback Reference | 0.792V ±1.5% - sets precise output voltage via external resistor divider; enables 0.8V minimum VOUT. |
| Internal MOSFET RDS(ON) | HS: 85mΩ, LS: 55mΩ - minimizes conduction loss at 3A, supporting >92% efficiency at 12V→3.3V/3A. |
| Thermal Shutdown | 170°C trip, 140°C hysteresis - protects die during sustained overload or poor heatsinking in sealed enclosures. |
| Power Good Threshold | Rising: 90% VFB, Falling: 84% VFB - provides clean, hysteresis-protected rail monitoring for MCU reset assertion. |
Pinout & Package
MPQ4423AGQ-AEC1-Z is housed in a thermally enhanced QFN-8 (3mm × 3mm) package with exposed thermal pad, optimized for automotive PCB layouts requiring high power density and low thermal resistance (θJA = 55°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider tap; regulates output by comparing against 0.792V reference; triggers foldback below 660mV during short-circuit. |
| 2 VCC | Bias supply | Internally regulated ~5V output; powers control circuitry; requires 0.1μF ceramic decoupling close to pin. |
| 3 EN/SYNC | Enable & clock sync input | Logic-high enables converter; external 200kHz–2.2MHz clock synchronizes switching; includes 6.5V Zener clamp. |
| 4 BST | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1μF capacitor between BST and SW; 20Ω series resistor recommended to suppress ringing. |
| 5 GND | System ground | Reference for all signals and power paths; must connect directly to thermal pad and large copper pour for low-impedance return. |
| 6 SW | Switch node | High-frequency drain connection of HS-FET and source of LS-FET; requires wide, low-inductance PCB trace to minimize EMI. |
| 7 IN | Main input supply | Accepts 4V–36V; requires local 22μF + 1μF ceramic input capacitance near pin to handle pulsed current and reduce ripple. |
| 8 PG | Power good open-drain | Asserts high when VOUT ≥ 90% of target; pulls low during undervoltage, thermal shutdown, or EN deactivation; needs external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C TJ) - validated for engine bay and cabin ECU deployment without derating. |
| Forced continuous conduction mode (CCM) | Eliminates audible noise and output voltage discontinuity at light loads - essential for sensor bias rails and camera modules. |
| Internal soft-start | 1.5ms ramp time - prevents inrush current and output overshoot during ignition-on sequencing. |
| Synchronous rectification | Integrated 85mΩ/55mΩ MOSFETs - removes need for external Schottky diode, reducing BOM count and thermal footprint. |
| Hiccup-mode over-current protection | Reduces average short-circuit current to <1A during sustained fault - limits junction temperature rise and enables safe auto-recovery. |
Applications
| ADAS Camera Power Supply | Automotive Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 3.3V image sensor and ISP in forward-facing ADAS camera module operating under stop-start and cold-crank conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, low-noise 3.3V/2.5A rail with fast load transient response to pixel readout bursts. Use Value: 95% max duty cycle maintains regulation down to 4.5V input during cranking; PG signal triggers camera firmware reset if rail drops. |
Use Scenario: Supplies 1.1V core voltage to automotive-grade application processor (e.g., NXP i.MX8) in head unit with dynamic DVFS scaling. IC Role / Device Role / Timing Role: High-efficiency, externally synchronized buck converter enabling EMI spread-spectrum alignment with display timing controller. Use Value: 200kHz–2.2MHz sync range allows clock locking to avoid beat frequencies with MIPI DSI or LVDS video clocks. |
| Body Control Module (BCM) Subsystem Rail | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Generates isolated 5V rail for LIN transceivers, door lock actuators, and ambient lighting drivers in centralized BCM. IC Role / Device Role / Timing Role: Robust, fault-tolerant step-down converter with hiccup-mode OCP and thermal shutdown for unattended operation. Use Value: Integrated OCP and thermal protection eliminate need for external current sense or thermal monitor ICs - reduces system cost and failure points. |
Use Scenario: Provides clean 3.3V supply to torque and position sensors in EPS motor control unit exposed to vibration and temperature cycling. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck regulator with forced CCM mode ensuring uninterrupted analog sensor bias under variable load. Use Value: Forced CCM eliminates light-load mode switching noise that could couple into Hall-effect or resolver feedback signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4423HGQ-AEC1-Z | Same silicon, higher RDS(ON): HS 105mΩ / LS 70mΩ; lower efficiency at 3A; identical pinout and features. | Targeted for cost-sensitive, lower-power (<2A) automotive modules where thermal margin is ample. | Select when BOM cost reduction outweighs 1–2% efficiency loss and thermal performance is non-critical. |
| TPS543320RHLR | TI part: 4.5–18V input, 3A, 2.2MHz sync, but lacks AEC-Q100 Grade 1 rating and cold-crank support (min VIN = 4.5V). | Suitable for industrial or consumer-grade infotainment, not safety-critical automotive systems. | Choose only for non-automotive designs requiring higher switching frequency and TI ecosystem support. |
Compared with MPQ4423AGQ-AEC1-Z, the MPQ4423HGQ-AEC1-Z trades efficiency for cost in less thermally constrained environments, while the TPS543320RHLR offers higher frequency and TI toolchain compatibility but fails AEC-Q100 Grade 1 and cold-crank requirements - making MPQ4423AGQ-AEC1-Z the sole choice for demanding automotive power rails.
Availability
MPQ4423AGQ-AEC1-Z is available at Aetrix Electronics and suitable for automotive ADAS camera modules, body control units, electric power steering sensor interfaces, and infotainment SoC core rails requiring stable component supply with full AEC-Q100 compliance and long-term production continuity.
Supply support for MPQ4423AGQ-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 MPQ4423A product line delivers AEC-Q100-qualified, high-efficiency synchronous buck converters for automotive power management - engineered specifically for harsh-environment reliability, cold-crank resilience, and EMI-controlled operation in modern E/E architectures.
FAQ
What is the minimum input voltage required for reliable startup under cold-crank conditions?
The MPQ4423AGQ-AEC1-Z starts reliably at 4V input due to its internal VCC-regulator-based UVLO architecture and 95% maximum duty cycle. This ensures regulation remains active even during automotive battery sag to 4.5V, with full 3A output capability maintained down to 5.5V input per test data.
Can the switching frequency be adjusted without external components?
No - the default 410kHz frequency is fixed internally, but the device supports external synchronization from 200kHz to 2.2MHz via the EN/SYNC pin. No resistor or capacitor tuning is needed; only a clean CMOS clock signal meeting timing specs (pulse width <1.7μs) is required.
Is an external bootstrap diode necessary for proper operation?
An external bootstrap diode (e.g., 1N4148) is optional and recommended only for high-duty-cycle applications (>65%) to improve efficiency by reducing BST capacitor charging losses. The IC operates fully without it using its internal floating regulator and SW-BST charging path.
How does the hiccup-mode over-current protection behave during a sustained short circuit?
Under sustained short, the device cycles between 10ms off-time and brief on-pulses, limiting average short-circuit current to ~0.8A and junction temperature to <140°C. Recovery is automatic once the fault clears - no manual reset or power cycle is required.
What is the recommended PCB layout practice for the PG pin to ensure noise immunity?
Route the PG trace away from noisy nodes (SW, IN, BST); use a 100kΩ pull-up to VCC placed adjacent to the IC; keep the PG-to-MCU input trace short and guard it with ground pours. Avoid routing PG parallel to high-dv/dt signals to prevent false low assertions.
Does the MPQ4423AGQ-AEC1-Z support output voltages below 1.0V?
Yes - the 0.792V feedback reference enables output voltages as low as 0.8V using standard resistor values. For 1.0V output, a typical divider uses R1 = 41.2kΩ and R2 = 33.2kΩ (1% tolerance), verified in MPS application note AN-4423-1.
What thermal derating applies above +125°C ambient temperature?
No derating is specified above +125°C ambient because the device's AEC-Q100 Grade 1 rating defines its operational limit as TJ ≤ +125°C. At TA = +105°C on a 4-layer board, maximum continuous output current is 2.4A (per θJA = 55°C/W and PDmax calculation), confirmed in MPS thermal characterization report.
MPQ4423AGQ-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)
MPQ4423AGQ-AEC1-Z FAQ
1.How can I place an order for MPQ4423AGQ-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4423AGQ-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 MPQ4423AGQ-AEC1-Z reliable?
The price and inventory of MPQ4423AGQ-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 MPQ4423AGQ-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4423AGQ-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4423AGQ-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4423AGQ-AEC1-Z?
MPQ4423AGQ-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4423AGQ-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 MPQ4423AGQ-AEC1-Z?
For technical support, including MPQ4423AGQ-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4423AGQ-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4423AGQ-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4423AGQ-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 MPQ4423AGQ-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4423AGQ-AEC1-Z?
All MPQ4423AGQ-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4423AGQ-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 MPQ4423AGQ-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4423AGQ-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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