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Monolithic Power Systems Inc. MPQ4423AGQ-P
- Part No.:
- MPQ4423AGQ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MPQ4423AGQ-P.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,304
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Product details
Overview
MPQ4423AGQ-P from Monolithic Power Systems is a 3A, 36V AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter with integrated 85mΩ/55mΩ MOSFETs, 410kHz default switching frequency, and forced CCM operation-designed for automotive power rails requiring cold-crank support down to 4V input.
For engineers reviewing the MPQ4423AGQ-P datasheet, MPQ4423AGQ-P pinout, MPQ4423AGQ-P application, or MPQ4423AGQ-P equivalent, this device delivers verified thermal shutdown (170°C), power-good signaling with 90μs delay, and external clock synchronization from 200kHz to 2.2MHz for EMI-sensitive automotive and industrial embedded systems.
Technical Context
The MPQ4423AGQ-P employs peak-current-mode control with internal compensation, enabling stable regulation across 4V–36V input while maintaining 0.8V–0.9×VIN output adjustability. Its current-limit threshold (3.6–7.8A) and foldback frequency (70–130kHz during fault) provide robust short-circuit protection without external sensing.
It integrates a 5V internal bias regulator powered from VIN, bootstrap charging circuitry with dedicated UVLO (2.2V), and an open-drain PG output referenced to VFB (86–94% rising threshold). The EN/SYNC pin supports both enable logic and external clock injection with 1.15–1.65V rising threshold and 150mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4V to 36V continuous - supports automotive battery transients including cold-crank (4.5V min) |
| Output current | 3A continuous - sustained at full load over -40°C to +125°C junction temperature |
| Switching frequency | Default 410kHz, synchronizable 200kHz–2.2MHz - enables EMI spread-spectrum design and noise avoidance |
| Feedback reference | 792mV ±12mV - sets output voltage via resistor divider; enables 0.8V minimum adjustable output |
| HS/LS RDS(on) | 85mΩ / 55mΩ - reduces conduction loss and improves full-load efficiency above 92% |
| Thermal shutdown | 170°C activation, 30°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Power good (PG) | Open-drain output with 90μs delay, 86–94% VFB rising threshold - provides reliable system power sequencing signal |
Pinout & Package
MPQ4423AGQ-P is housed in a thermally enhanced QFN-8 (3mm × 3mm) package with exposed thermal pad, optimized for automotive PCB layouts requiring low θJA (55°C/W) and high reliability under vibration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider tap; regulates output by comparing against 0.792V internal reference |
| 2 VCC | Bias supply rail | Powers internal circuitry; requires 0.1µF ceramic decoupling close to pin |
| 3 EN/SYNC | Enable & clock sync input | Digital enable (1.15–1.65V threshold); accepts external 200kHz–2.2MHz clock for EMI control |
| 4 BST | Bootstrap supply node | Charges high-side gate driver; requires 0.1µF capacitor and 20Ω series resistor to suppress SW spikes |
| 5 GND | Power and signal ground | Reference for all voltages; must connect directly to thermal pad and large copper pour |
| 6 SW | Switch node | Drives external inductor; high di/dt path requiring wide, short PCB trace |
| 7 IN | Main input supply | Accepts 4V–36V; requires 22µF ceramic + 1µF high-frequency bypass near pin |
| 8 PG | Power-good indicator | Open-drain output pulled high when VOUT ≥ 90% of target; used for system reset or sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Forced continuous conduction mode (CCM) | Maintains fixed-frequency operation even at light loads-critical for predictable EMI and stable control loop behavior |
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures (-40°C to +125°C) and lifetime reliability per stress test requirements |
| Internal soft-start | 1.5ms ramp time prevents output overshoot and inrush current during startup |
| Hiccup-mode over-current protection | Reduces average short-circuit current to limit thermal stress during sustained output faults |
| High duty-cycle capability | 95% max duty cycle enables 3.3V output from 4.5V cold-crank input-essential for automotive start-stop systems |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers 3.3V SoC and memory subsystems in head units operating across battery voltage swings (5.5V–16V) and cold-crank events. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V/3A with PG signaling for SoC reset coordination. Use Value: 4V minimum input and 95% duty cycle ensure uninterrupted operation during 6V cold-crank dips; AEC-Q100 Grade 1 guarantees field reliability. | Use Scenario: Supplies isolated 5V logic rails for digital I/O expansion modules in factory automation controllers. IC Role / Device Role / Timing Role: Point-of-load converter regulating 5V from 24V industrial bus with precise PG assertion for FPGA configuration sequencing. Use Value: Synchronization to system clock (1MHz) eliminates beat frequencies; hiccup OCP prevents latch-up during field-wiring faults. |
| Distributed Telecom Power | Medical Diagnostic Sensor Interface |
Use Scenario: Generates 3.3V for Ethernet PHY and microcontroller in remote radio unit (RRU) base stations with 36V backplane input. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting 36V intermediate bus to 3.3V logic rail with thermal shutdown for unventilated enclosures. Use Value: 85mΩ/55mΩ MOSFETs achieve >92% efficiency at 2A, reducing heatsink size; QFN-8 footprint saves board space in dense RF modules. | Use Scenario: Powers analog front-end (AFE) and ADC in portable ultrasound probe requiring ultra-low noise and precise voltage tracking. IC Role / Device Role / Timing Role: Low-noise buck regulator with tight VFB tolerance (±12mV) and minimal PG delay (90μs) for real-time sensor calibration. Use Value: Internal compensation and 410kHz fSW simplify filtering; forced CCM avoids audible switching noise in sensitive analog signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4423AGQ-Z | Identical electrical specs; differs only in tape-and-reel packaging (–Z suffix) | No functional difference; intended for automated SMT assembly | Select for volume production; same thermal and electrical performance as MPQ4423AGQ-P |
| MPQ4425AGQ-P | Higher 5A output current, same 36V input, 65mΩ/35mΩ MOSFETs, 410kHz fSW | Supports higher-power loads but consumes more PCB area and requires larger inductor | Choose when >3A continuous current or lower RDS(on) is required; not drop-in due to different current-sense scaling |
Compared with MPQ4423AGQ-P, MPQ4423AGQ-Z offers identical performance in tape-and-reel form for SMT lines, while MPQ4425AGQ-P extends current capability to 5A at the cost of increased layout complexity and thermal management demands.
Availability
MPQ4423AGQ-P is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and distributed telecom power systems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle assurance.
Supply support for MPQ4423AGQ-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 analog and power ICs, with core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ4423A product line targets automotive-grade power management, emphasizing AEC-Q100 qualification, cold-crank robustness, and compact integration for space-constrained vehicle electronics.
FAQ
What is the minimum input voltage required for MPQ4423AGQ-P to regulate 3.3V output?
The MPQ4423AGQ-P supports a minimum 4V input, enabling stable 3.3V regulation during automotive cold-crank conditions where battery voltage may dip to 4.5V. Its 95% maximum duty cycle ensures sufficient headroom to maintain regulation even at 4.2V input.
Can MPQ4423AGQ-P operate without an external bootstrap resistor?
No-MPS strongly recommends a 20Ω resistor between SW and BST pins to suppress voltage spikes on the switch node. Omitting it risks gate driver instability, increased EMI, and potential damage to the internal high-side MOSFET driver.
How does the hiccup-mode over-current protection behave during a sustained short circuit?
When FB drops below 84% of the target voltage, MPQ4423AGQ-P enters hiccup mode: it disables switching for ~10ms, then attempts restart. This limits average short-circuit current to ~1.5A and die temperature rise, preventing thermal runaway while allowing automatic recovery once the fault clears.
Is the PG pin compatible with 3.3V logic systems?
Yes-the PG pin is open-drain and requires an external pull-up (e.g., to 3.3V). It asserts high when VOUT reaches ≥90% of the programmed value, with 90μs delay and 6% hysteresis, making it directly interfaceable with 3.3V microcontrollers for power sequencing.
Does MPQ4423AGQ-P require external compensation components?
No-it features fully internal compensation with optimized network for standard 10µH inductors and ceramic output capacitors. No external RC networks are needed, reducing BOM count and simplifying layout while maintaining stability across 0.8V–12V outputs.
What is the thermal resistance (θJA) of MPQ4423AGQ-P on a standard 4-layer PCB?
Measured per JESD51-7 on a 4-layer board, θJA is 55°C/W. This value assumes proper thermal vias under the exposed pad and ≥1in² copper pour on inner layers-achievable in typical automotive PCB stackups.
Can EN/SYNC be left floating for default operation?
Yes-an internal 500kΩ pull-down resistor allows EN/SYNC to float for always-on operation. However, for noise immunity in automotive environments, MPS recommends a 100kΩ pull-up to VIN to ensure clean enable behavior during transients.
MPQ4423AGQ-P 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
MPQ4423AGQ-P FAQ
1.How can I place an order for MPQ4423AGQ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4423AGQ-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 MPQ4423AGQ-P reliable?
The price and inventory of MPQ4423AGQ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4423AGQ-P is usually 5 days.
3.What payment methods are accepted for MPQ4423AGQ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4423AGQ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4423AGQ-P?
MPQ4423AGQ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4423AGQ-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 MPQ4423AGQ-P?
For technical support, including MPQ4423AGQ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4423AGQ-P requirements.
6.How does Aetrix verify that MPQ4423AGQ-P is sourced from the original manufacturer or authorized distributors?
All MPQ4423AGQ-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 MPQ4423AGQ-P meets industry standards.
7.What is the process for return or replacement of MPQ4423AGQ-P?
All MPQ4423AGQ-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4423AGQ-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 MPQ4423AGQ-P part is unused and in its original packaging.
Return procedure for MPQ4423AGQ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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