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Monolithic Power Systems Inc. MPQ4423GQ-AEC1-Z
- Part No.:
- MPQ4423GQ-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MPQ4423GQ-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:13,586
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Product details
Overview
MPQ4423GQ-AEC1-Z from Monolithic Power Systems is a high-efficiency, AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 3A continuous output current with 4V–30V input range, 36V transient tolerance, and integrated 85mΩ/55mΩ MOSFETs-designed for automotive power rails requiring cold-crank support and load-dump resilience.
For engineers reviewing the MPQ4423GQ-AEC1-Z datasheet, MPQ4423GQ-AEC1-Z pinout, MPQ4423GQ-AEC1-Z application, or MPQ4423GQ-AEC1-Z equivalent, key selection criteria include its 410kHz default switching frequency, internal soft-start, power-good (PG) flag, thermal shutdown at 170°C, and EN/SYNC dual-function pin enabling external clock synchronization from 200kHz to 2.2MHz.
Technical Context
The MPQ4423GQ-AEC1-Z employs peak-current-mode control with fixed-frequency PWM operation, using an internal 0.8V reference and error amplifier with optimized compensation to minimize external components. Its cycle-by-cycle over-current protection triggers at 3.2–5.7A and enters hiccup mode when FB falls below 84% of VREF during sustained overload.
It integrates a bootstrap driver with dedicated UVLO (2.2V rising threshold), supports high-duty-cycle operation (>92%) for automotive cold-crank, and features a floating gate driver powered via BST-SW capacitor charged through an internal PMOS pass transistor-enabled only when LS-FET is on and VIN–VSW voltage headroom is sufficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous; withstands 36V transients for automotive load dump compliance. |
| Output Current | 3A continuous; supports peak inductor current up to ~4.5A with 30% ripple. |
| Switching Frequency | Default 410kHz; synchronizable to 200kHz–2.2MHz external clock for EMI reduction. |
| Feedback Reference | 792mV typical; ±12mV tolerance ensures tight output regulation across temperature. |
| Thermal Shutdown | Triggers at 170°C junction temperature; hysteresis of 30°C enables automatic recovery at ~140°C. |
| Power Good Threshold | PG asserts high when VOUT ≥ 90% × VFB (≈713mV); deasserts at ≤84% × VFB (≈665mV). |
| Quiescent Current | 0.7mA typical at VEN=2V; drops to 8μA in shutdown for low-power vehicle-off states. |
Pinout & Package
MPQ4423GQ-AEC1-Z is housed in a thermally enhanced QFN-8 (3mm × 3mm) package with exposed thermal pad, supporting high-power density in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Senses output voltage via resistor divider; sets regulation point and enables fold-back frequency reduction during short-circuit. |
| 2 VCC | Bias Supply Rail | Internal 5V regulator output; powers control circuitry and requires 0.1–0.22μF decoupling close to pin. |
| 3 EN/SYNC | Enable & Clock Input | Digital enable (1.4V rising threshold); accepts 200kHz–2.2MHz external clock for synchronization. |
| 4 BST | Bootstrap Supply | Provides floating gate drive for high-side MOSFET; requires capacitor between BST and SW with 20Ω series resistor. |
| 5 GND | System Ground Reference | Common return for output regulation, thermal pad connection, and PCB layout critical for noise immunity. |
| 6 SW | Switch Node | Drives external inductor; high di/dt node requiring wide copper trace and careful routing away from analog pins. |
| 7 IN | Main Input Supply | Accepts 4–30V input; requires local 22μF + 1μF ceramic capacitors for ripple suppression and HF noise filtering. |
| 8 PG | Open-Drain Power-Good Flag | Signals valid regulation (high) after soft-start and VOUT stability; pulled low during fault, shutdown, or undervoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 85mΩ HS / 55mΩ LS MOSFETs reduce conduction loss and eliminate external switch selection. |
| Automotive Transient Robustness | 36V input transient tolerance meets ISO 7637-2 Pulse 5a requirements without external clamping. |
| Cold-Crank Support | 95% maximum duty cycle enables stable 3.3V/5V output down to 4.5V input during engine start. |
| Internal Soft-Start | 1.5ms ramp time prevents output overshoot and limits inrush current into bulk capacitance. |
| Power-Good Monitoring | Programmable PG thresholds (±6% hysteresis) provide reliable system-level power sequencing feedback. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codecs in head-unit systems with variable battery voltage (6–16V) and load-dump events. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator providing regulated rail with fast transient response to burst-mode processor loads. Use Value: Synchronous operation and low RDS(ON) maintain >92% efficiency at 2A load, reducing thermal stress in sealed enclosures. | Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view cameras mounted in exterior housings. IC Role / Device Role / Timing Role: Cold-crank capable DC/DC converter delivering stable 1.8V/3.3V under 4.5V battery conditions during engine cranking. Use Value: 95% duty cycle and 170°C thermal shutdown protect against overheating in confined camera PCB layouts. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Regulates power for microcontroller, CAN transceivers, and LED drivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: System power manager with EN/SYNC pin enabling synchronized switching across multiple rails to suppress beat frequencies. Use Value: 410kHz base frequency and external sync capability simplify EMI filter design and meet CISPR-25 Class 5 limits. | Use Scenario: Provides isolated 3.3V domain for cellular modem, GNSS receiver, and secure element in connected vehicle gateways. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified primary buck converter with PG signal for safe boot sequence validation. Use Value: Power-good flag timing (90μs delay) ensures firmware waits for stable supply before initializing RF subsystems. |
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 |
|---|---|---|---|
| LM61480-Q1 | Higher 8A rating, 2.1MHz max frequency, but larger QFN-16 package and higher quiescent current (15μA shutdown vs. 8μA). | Targets higher-power ADAS domains (e.g., radar); less suitable for compact infotainment modules due to footprint and thermal mass. | Select when >3A output or faster transient response is required; verify PCB area and thermal pad compatibility. |
| TPS543320 | Supports 4–18V input, 3A output, but lacks 36V transient tolerance and AEC-Q100 Grade 1 certification. | Designed for industrial/commercial use; not qualified for automotive front-end power where load dump is present. | Only consider for non-automotive embedded systems; avoid in any vehicle-battery-connected application. |
Compared with LM61480-Q1 and TPS543320, MPQ4423GQ-AEC1-Z delivers optimal balance of automotive qualification, compact QFN-8 footprint, ultra-low shutdown current, and proven cold-crank performance-making it preferred for cost- and space-sensitive Tier 2 automotive modules.
Availability
MPQ4423GQ-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply with full AEC-Q100 Grade 1 traceability and long-term production continuity.
Supply support for MPQ4423GQ-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ4423 belongs to MPS's automotive-grade power management portfolio, engineered specifically for harsh-temperature, high-reliability vehicle subsystems where input transients, cold-crank, and functional safety awareness are mandatory.
FAQ
What is the purpose of the BST pin and why is a 20Ω resistor recommended?
The BST pin supplies the floating gate drive voltage for the internal high-side MOSFET via a bootstrap capacitor connected between BST and SW. A 20Ω resistor in series with the BST capacitor reduces high-frequency ringing and voltage spikes at the SW node during switching transitions-critical for EMI control and MOSFET reliability. Omitting it risks excessive voltage overshoot that may exceed absolute maximum ratings.
How does the MPQ4423GQ-AEC1-Z handle automotive cold-crank conditions?
During cold-crank, battery voltage can dip to 4.5V while the converter must sustain regulated output. The MPQ4423GQ-AEC1-Z achieves this via 95% maximum duty cycle, allowing near-unity input-to-output ratio, and internal 5V bias regulator that remains functional down to VIN = 4V. Its current-mode control also maintains loop stability even at extreme duty cycles.
Can the MPQ4423GQ-AEC1-Z be synchronized to an external clock, and what are the timing constraints?
Yes-the EN/SYNC pin accepts an external clock from 200kHz to 2.2MHz. Synchronization begins 2ms after output reaches regulation, aligning the internal oscillator's rising edge to the external clock's rising edge. The external clock pulse width must be <1.7μs to avoid mis-triggering, and the signal must be clean with fast edges to prevent jitter-induced EMI spread.
What is the function of the PG pin, and how is its timing calibrated?
The PG (Power Good) pin is an open-drain output signaling valid regulation. It pulls high when VOUT reaches ≥90% of the nominal setpoint (e.g., ≥3.0V for 3.3V output), with a typical 90μs assertion delay after threshold crossing. It pulls low if VOUT drops to ≤84%, EN is deasserted, or thermal shutdown activates-enabling precise power sequencing in multi-rail systems.
Does the MPQ4423GQ-AEC1-Z require external compensation components?
No-its error amplifier uses an internally optimized compensation network, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design and improves consistency across production units. Only the feedback resistors (R1/R2) and optional T-network components are required to set output voltage and fine-tune loop bandwidth.
How does over-current protection operate during a sustained short-circuit?
Under short-circuit, the MPQ4423GQ-AEC1-Z first applies cycle-by-cycle current limiting at ~4.4A (typical). If FB drops below 84% of VREF, it enters hiccup mode: disabling switching for ~10ms, then attempting restart. This limits average short-circuit current to ~1A, preventing thermal runaway and enabling safe auto-recovery once the fault clears.
Is the QFN-8 (3mm×3mm) package lead-free and RoHS-compliant?
Yes-MPQ4423GQ-AEC1-Z is fully lead-free and complies with the EU RoHS directive. All solderable surfaces use matte tin plating, and the package meets JEDEC MO-220 standards. MPS confirms green status on its Quality Assurance portal, including halogen-free and antimony-free material declarations.
MPQ4423GQ-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):
- 30V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 27V
- 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)
MPQ4423GQ-AEC1-Z FAQ
1.How can I place an order for MPQ4423GQ-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4423GQ-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 MPQ4423GQ-AEC1-Z reliable?
The price and inventory of MPQ4423GQ-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 MPQ4423GQ-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4423GQ-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4423GQ-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4423GQ-AEC1-Z?
MPQ4423GQ-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4423GQ-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 MPQ4423GQ-AEC1-Z?
For technical support, including MPQ4423GQ-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4423GQ-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4423GQ-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4423GQ-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 MPQ4423GQ-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4423GQ-AEC1-Z?
All MPQ4423GQ-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4423GQ-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 MPQ4423GQ-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4423GQ-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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