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Monolithic Power Systems Inc. MP4423GQ-Z
- Part No.:
- MP4423GQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MP4423GQ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,585
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Product details
Overview
MP4423GQ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter delivering 3A continuous output current with input voltage range of 4V–30V, 36V transient tolerance, and integrated 85mΩ/55mΩ MOSFETs. It operates at 410kHz (default), supports external synchronization up to 2.2MHz, and features power-good signaling, thermal shutdown, and hiccup-mode over-current protection - deployed in automotive infotainment power rails and industrial sensor node supplies.
For engineers reviewing the MP4423GQ-Z datasheet, MP4423GQ-Z pinout, MP4423GQ-Z application, or MP4423GQ-Z equivalent, key selection criteria include cold-crank duty cycle capability (>92%), 0.8V adjustable output, bootstrap capacitor interface for high-side gate drive, and QFN-8 (3mm×3mm) thermal performance with θJA = 55°C/W.
Technical Context
The MP4423GQ-Z employs peak-current-mode control with internal compensation, enabling stable regulation across wide VIN (4–30V) and VOUT (0.8V–0.9×VIN) ranges without external loop components. Its 410kHz fixed-frequency oscillator supports external synchronization from 200kHz to 2.2MHz via the EN/SYNC pin, allowing EMI optimization in noise-sensitive systems.
It integrates a 5V internal bias regulator powered from VIN, a floating high-side driver with bootstrap charging circuitry (BST pin), and a dedicated open-drain PG output with 90% VFB rising threshold and 90μs delay. Thermal shutdown activates at 170°C with 30°C hysteresis, and over-current protection uses cycle-by-cycle limiting followed by hiccup mode under sustained short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous; supports 36V transients for automotive load dump survival |
| Output Current | 3A continuous; validated with 10µH inductor and 3.3V/3A typical application |
| Switching Frequency | 410kHz default; synchronizable from 200kHz to 2.2MHz for EMI spread-spectrum design |
| Feedback Reference | 792mV ±12mV; enables precise 0.8V–24V output adjustment using resistor divider |
| Internal MOSFET RDS(ON) | 85mΩ (HS), 55mΩ (LS); reduces conduction loss and improves full-load efficiency |
| Thermal Shutdown | 170°C activation with 30°C hysteresis; protects die during overload or poor PCB heatsinking |
| Power Good Threshold | Rising at 90% × VFB (±4%); provides reliable system power sequencing signal with 90μs delay |
Pinout & Package
MP4423GQ-Z is housed in a thermally enhanced QFN-8 package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports ≤2.27W continuous power dissipation at +25°C ambient and requires PCB copper area and vias under the pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider tap; sets output voltage and triggers fold-back frequency reduction below 660mV during fault |
| 2 VCC | Bias Supply Rail | Internally regulated ~5V output; requires 0.1µF ceramic decoupling close to pin |
| 3 EN/SYNC | Enable & Clock Input | Logic-high enables operation; external clock signal (200kHz–2.2MHz) synchronizes switching edge |
| 4 BST | Bootstrap Supply | Connects to SW via 0.1µF capacitor and 20Ω series resistor; powers high-side gate driver |
| 5 GND | System Ground Reference | Primary return path for output current and feedback; requires low-impedance PCB plane and multiple vias |
| 6 SW | Switch Node | Drives external inductor; high dv/dt node requiring short, wide trace routing away from analog signals |
| 7 IN | Main Input Supply | Accepts 4V–30V; requires ≥22µF X5R/X7R ceramic input capacitor placed adjacent to IN/GND pins |
| 8 PG | Power-Good Output | Open-drain signal pulled high when VOUT ≥ 90% × VFB; used for system reset or enable sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Cold-Crank Support | 95% maximum duty cycle enables regulation down to 3.5V VIN while maintaining 3.3V output |
| Integrated Bootstrap Charging | Dedicated internal regulator charges BST capacitor to ~5V; eliminates need for external diode in most designs |
| Power-Save Mode | Reduces quiescent current to 0.7mA at light loads; maintains regulation without pulse-skipping artifacts |
| Internal Soft-Start | 1.5ms ramp time prevents output overshoot and limits inrush current during startup |
| Robust Fault Protection | OCP with hiccup recovery, thermal shutdown with hysteresis, and UVLO with 200mV hysteresis ensure field reliability |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Powering DSP, display controller, and audio codec in 12V vehicle electrical system with load dump and cold-crank events. IC Role / Device Role / Timing Role: Primary 3.3V/3A buck regulator; handles 36V transients and sustains operation down to 3.5V input during cranking. Use Value: Eliminates need for external TVS and pre-regulator stages; reduces BOM count by integrating dual MOSFETs and bootstrap circuitry. |
Use Scenario: Providing stable 5V rail for microcontroller, RS-485 transceiver, and analog front-end in factory-floor wireless sensor node. IC Role / Device Role / Timing Role: Isolated point-of-load converter; synchronized to system clock to minimize conducted EMI in dense PCB layouts. Use Value: Enables deterministic timing alignment across multiple converters; reduces filtering component count with 2.2MHz sync capability. |
| Distributed Telecom Power | Medical Diagnostic Module Supply |
|
Use Scenario: Generating 3.3V from 24V intermediate bus in telecom line card with strict thermal constraints and airflow limitations. IC Role / Device Role / Timing Role: High-efficiency synchronous buck stage; operates in forced PWM mode to avoid audible noise and ensure consistent timing. Use Value: Achieves >92% efficiency at 2A load with QFN-8 package; thermal pad enables direct heatsink attachment on limited-board-area modules. |
Use Scenario: Powering ADC, op-amp signal chain, and isolated UART in portable ultrasound probe requiring low-noise, low-ripple supply. IC Role / Device Role / Timing Role: Low-ESR output-capacitor optimized buck regulator; uses internal compensation to maintain stability with ceramic output caps. Use Value: Delivers <15mVpp output ripple at 3A with 22µF X7R ceramic; avoids tantalum cap aging and leakage issues in long-life medical devices. |
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 |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz default fSW; larger QFN-16 package; no integrated BST resistor recommendation | Better suited for higher-current, space-tolerant designs; lacks cold-crank optimized duty cycle (92% vs. 95%) | Select when >4A output or higher switching frequency is required; verify layout compatibility with larger footprint and thermal pad |
| TPS54332DR | 3.5V–28V input, 3A output, 570kHz fSW; external MOSFETs; no PG or BST pin; requires external compensation | Higher design flexibility but increased BOM and layout complexity; no power-good signaling or bootstrap integration | Choose only if discrete FET selection or custom loop tuning is mandatory; not drop-in compatible due to topology and pinout differences |
Compared with LM61480RQWR and TPS54332DR, MP4423GQ-Z offers superior cold-crank headroom, integrated BST interface, and minimal external component count - making it optimal for compact, automotive-qualified 3A point-of-load designs where thermal density and transient robustness are critical.
Availability
MP4423GQ-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and distributed telecom power supplies requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned reliability.
Supply support for MP4423GQ-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP4423 belongs to MPS's automotive-grade synchronous buck converter product line, designed specifically for harsh-environment DC/DC conversion in vehicles and industrial equipment with stringent input transient and thermal requirements.
FAQ
What is the minimum input voltage required for MP4423GQ-Z to regulate a 3.3V output?
The MP4423GQ-Z maintains regulation down to 3.5V input during cold-crank events due to its 95% maximum duty cycle and internal UVLO hysteresis. At steady state, the minimum functional VIN is 4V - verified per Recommended Operating Conditions table, where VOUT = 0.9 × VIN implies 3.3V output requires ≥3.67V input, but the device remains enabled and operational at 3.5V with reduced duty cycle margin.
Can MP4423GQ-Z operate without an external bootstrap resistor?
No - a 20Ω resistor between BST and SW is strongly recommended in the datasheet to suppress SW node voltage spikes during high dv/dt transitions. Omitting it risks false triggering of over-voltage protection, increased EMI, and potential damage to the internal high-side driver; the resistor dampens ringing without significantly degrading efficiency.
How does the MP4423GQ-Z handle output short-circuit conditions?
Under sustained short-circuit, MP4423GQ-Z enters hiccup mode: after cycle-by-cycle current limit trips repeatedly, FB drops below 84% of reference, disabling switching for ~3ms before attempting restart. This limits average short-circuit current to <1A and die temperature rise, preventing thermal runaway while enabling automatic recovery once fault clears.
Is the PG pin compatible with 3.3V logic systems?
Yes - the PG pin is open-drain and must be pulled up to any voltage ≤6V (e.g., 3.3V or 5V) via an external resistor (typically 10kΩ–100kΩ). Its logic-high state occurs when VOUT reaches ≥90% × VFB, and it pulls low during undervoltage, thermal shutdown, or EN deactivation - fully interoperable with standard CMOS inputs.
What is the purpose of the T-type feedback network shown in the datasheet?
The T-type network (R1, R2, RT) improves loop stability for low-output-voltage designs (<5V) by adjusting phase margin without adding poles. RT in series with R1 modifies the zero location in the feedback path, enabling bandwidth control below 40kHz - critical for maintaining stability with the MP4423GQ-Z's fixed internal compensation when using small output capacitors.
Does MP4423GQ-Z require external compensation components?
No - the MP4423GQ-Z uses an optimized internal compensation network that eliminates the need for external Type-II or Type-III compensators. Stability is guaranteed across the full operating range with standard ceramic output capacitors (22µF–100µF) and recommended inductor values (1µH–10µH), reducing design risk and BOM cost.
What PCB layout practices are essential for thermal performance?
Thermal performance depends on soldering the exposed thermal pad to ≥2cm² of inner-layer copper ground plane using ≥6 thermal vias (0.3mm diameter). Input capacitor (22µF) and VCC capacitor (0.1µF) must be placed within 2mm of respective pins, and SW/GND traces must be wide (>0.5mm) and short to minimize parasitic inductance and switching losses.
MP4423GQ-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
MP4423GQ-Z FAQ
1.How can I place an order for MP4423GQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4423GQ-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 MP4423GQ-Z reliable?
The price and inventory of MP4423GQ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4423GQ-Z is usually 5 days.
3.What payment methods are accepted for MP4423GQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4423GQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4423GQ-Z?
MP4423GQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4423GQ-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 MP4423GQ-Z?
For technical support, including MP4423GQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4423GQ-Z requirements.
6.How does Aetrix verify that MP4423GQ-Z is sourced from the original manufacturer or authorized distributors?
All MP4423GQ-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 MP4423GQ-Z meets industry standards.
7.What is the process for return or replacement of MP4423GQ-Z?
All MP4423GQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4423GQ-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 MP4423GQ-Z part is unused and in its original packaging.
Return procedure for MP4423GQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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