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Monolithic Power Systems Inc. MPQ4423AGQ-Z
- Part No.:
- MPQ4423AGQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VDFN
- Datasheet:
-
MPQ4423AGQ-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,217
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Product details
Overview
MPQ4423AGQ-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC designed for automotive and industrial power rails. It delivers 3A continuous output current with 4V–36V input range, 0.8V–32.4V adjustable output, and AEC-Q100 Grade 1 qualification - enabling use in engine control units, ADAS camera modules, and 24V industrial PLCs.
For engineers reviewing the MPQ4423AGQ-Z datasheet, MPQ4423AGQ-Z pinout, MPQ4423AGQ-Z application, or MPQ4423AGQ-Z equivalent, key selection criteria include its 410kHz default switching frequency, forced CCM mode for light-load stability, integrated 85mΩ/55mΩ MOSFETs, and PG open-drain status signal with 90% VFB threshold.
Technical Context
The MPQ4423AGQ-Z employs peak-current-mode control with internal compensation, enabling fast transient response and simplified loop design without external compensation components. Its fixed-frequency operation (410kHz default) supports synchronization to external clocks from 200kHz to 2.2MHz, allowing EMI optimization in noise-sensitive systems.
It integrates high-side and low-side MOSFETs with RDS(ON) of 85mΩ and 55mΩ respectively, and features a dedicated bootstrap driver with internal 5V regulator and 2.2V UVLO for floating gate drive. Thermal shutdown activates at 170°C with 30°C hysteresis, and hiccup-mode OCP limits average short-circuit current during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports automotive cold-crank (4.5V) and industrial 24V/36V rails without external pre-regulation. |
| Output Current | 3A continuous - sustains full load across -40°C to +125°C junction temperature with proper PCB thermal design. |
| Switching Frequency | 410kHz default, synchronizable 200kHz–2.2MHz - enables EMI spread-spectrum tuning and avoids sensitive IF bands. |
| Feedback Reference | 0.792V ±1.5% - sets precise output voltage via external resistor divider; enables 0.8V minimum VOUT. |
| Power Good Threshold | 90% of VFB rising / 84% falling - provides accurate, hysteresis-controlled system power sequencing signal. |
| Thermal Shutdown | 170°C activation / 140°C recovery - protects die under sustained overload or poor heatsinking without latch-off. |
| OCP Trigger Level | 3.6A to 7.8A (typ. 5.7A) - cycle-by-cycle current limiting prevents MOSFET failure during startup or short-circuit events. |
Pinout & Package
MPQ4423AGQ-Z is housed in a thermally enhanced QFN-8 (3mm × 3mm) package with exposed thermal pad, optimized for high-power density and efficient PCB heat dissipation in space-constrained automotive modules.
| 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. |
| 2 VCC | Bias supply rail | Powers internal circuitry; requires 0.1μF ceramic decoupling; regulated from VIN across full input range. |
| 3 EN/SYNC | Enable & clock sync input | Digital enable (1.4V threshold); accepts 200kHz–2.2MHz external clock for EMI control; includes 6.5V Zener clamp. |
| 4 BST | Bootstrap supply node | Drives high-side MOSFET gate; requires 0.1μF capacitor to SW; 20Ω series resistor recommended to suppress ringing. |
| 5 GND | Power ground reference | System return for output regulation; must connect to large copper plane with multiple vias for low-impedance thermal path. |
| 6 SW | Switch node | High-frequency drain connection of internal HS-FET and source of LS-FET; requires wide, low-inductance PCB trace. |
| 7 IN | Main input supply | Accepts 4V–36V; requires 22μF ceramic + 1μF high-frequency bypass near pin; RMS current rating ≥1.5A. |
| 8 PG | Open-drain power-good output | Signals valid regulation (VOUT ≥90% target); pulled low during startup, fault, or shutdown; requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 85mΩ HS + 55mΩ LS MOSFETs - eliminates external FETs and drivers, reducing BOM count and layout complexity. |
| Forced Continuous Conduction Mode (CCM) | Maintains fixed-frequency operation down to zero load - avoids audible noise and output voltage jumps common in DCM. |
| Internal Soft Start | 1.5ms ramp time - prevents output overshoot and inrush current during power-up in battery-fed systems. |
| Automotive Cold-Crank Support | 95% max duty cycle - sustains regulation during 4.5V engine cranking events without dropout in 12V systems. |
| Synchronization Capability | 200kHz–2.2MHz external clock acceptance - enables deterministic switching alignment across multi-rail power systems. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module DC/DC |
|---|---|
Use Scenario: Regulating 5V or 3.3V from noisy 12V vehicle battery for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck converter delivering stable, low-noise power with cold-crank hold-up and power-good sequencing. Use Value: AEC-Q100 Grade 1 qualification ensures reliability over -40°C to +125°C; 36V abs max withstands load-dump transients up to 40V. |
Use Scenario: Generating clean 1.8V or 3.3V for image sensor and ISP in forward-facing radar/camera fusion units. IC Role / Device Role / Timing Role: Point-of-load regulator with tight output tolerance (±1.5% ref), low ripple, and fast transient response to dynamic pixel loads. Use Value: Forced CCM mode eliminates low-load frequency modulation; PG signal enables safe sensor initialization before exposure timing. |
| Industrial PLC I/O Module | Railway Signaling Power Converter |
Use Scenario: Providing isolated 5V/3.3V bias for digital I/O, analog front-ends, and communication interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-efficiency non-isolated buck stage accepting wide 24V±20% input; supports redundant supply inputs. Use Value: 4V–36V input range accommodates brownouts and surges per IEC 61000-4-5; thermal shutdown prevents field failures in enclosed enclosures. |
Use Scenario: Converting 72V or 110V nominal railway battery to 5V/12V for signaling logic, LED indicators, and safety relays. IC Role / Device Role / Timing Role: Pre-regulator stepping down high-voltage rail to intermediate level before downstream LDOs or isolated DC/DC. Use Value: 36V max input allows direct use with 72V systems when paired with external front-end clamping; QFN-8 footprint minimizes board area in constrained cabinets. |
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 |
|---|---|---|---|
| MPQ4420AGJ-Z | 2A output, same 4V–36V input, identical pinout and feature set except lower current rating and no AEC-Q100 grade. | Suitable for cost-sensitive industrial controls where automotive qualification is unnecessary and load current ≤2A. | Select when thermal margin and AEC-Q100 compliance are not required; reduces BOM cost without redesign. |
| TPS54332DR | 3A, 3.5V–28V input, 570kHz fixed freq, no sync capability, non-AEC-Q100, SOIC-8 package. | Used in commercial-grade industrial equipment where 28V max input suffices and QFN thermal performance is not critical. | Choose for legacy SOIC layouts or where external sync is unnecessary; verify thermal derating on 2-layer boards. |
Compared with MPQ4423AGQ-Z, MPQ4420AGJ-Z offers identical functionality at reduced current and qualification level, while TPS54332DR trades automotive robustness and package efficiency for SOIC compatibility and Texas Instruments ecosystem support.
Availability
MPQ4423AGQ-Z is available at Aetrix Electronics and suitable for automotive ECU power supplies, ADAS camera modules, and industrial PLC I/O systems requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for MPQ4423AGQ-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 MPQ4423A belongs to MPS's automotive-qualified buck converter product line, engineered specifically for harsh-environment power delivery in engine bays, chassis modules, and rail transport electronics.
FAQ
What is the minimum input voltage required for reliable startup?
The MPQ4423AGQ-Z has an under-voltage lockout (UVLO) with a rising threshold of 3.5V and falling threshold of 3.3V. Reliable startup occurs when VIN exceeds 3.5V; operation continues down to 3.3V before shutdown. This supports automotive cold-crank scenarios where battery voltage dips to ~4.5V.
Can the MPQ4423AGQ-Z operate in discontinuous conduction mode (DCM)?
No - the MPQ4423AGQ-Z operates exclusively in forced continuous conduction mode (CCM) across all load conditions, including zero load. This eliminates frequency variation and associated EMI spread, ensuring predictable switching behavior and stable output voltage without audible noise.
How is the power-good (PG) signal configured and used?
PG is an open-drain output requiring an external pull-up resistor (typically 100kΩ to VCC). It asserts high when VFB reaches 90% of the 0.792V reference (i.e., ~713mV), with a typical 90μs delay. It deasserts low if VFB falls to 84% (~665mV), during thermal shutdown, or when EN is pulled low - enabling precise power sequencing.
What is the purpose of the BST pin and its recommended external components?
The BST pin supplies the floating gate drive for the internal high-side MOSFET. A 0.1μF ceramic capacitor must be placed between BST and SW. A 20Ω resistor in series with this capacitor is strongly recommended to dampen SW node ringing and reduce EMI, especially at high duty cycles or fast switching edges.
Does the MPQ4423AGQ-Z require external compensation components?
No - the MPQ4423AGQ-Z features an internally compensated current-mode control loop. No external compensation network (e.g., Type II/III compensator) is needed. Stability is ensured across standard output capacitor types (ceramic, tantalum, electrolytic) and ESR ranges, simplifying design and reducing bill-of-materials.
How does the device handle short-circuit conditions?
Under short-circuit, the MPQ4423AGQ-Z enters hiccup mode after FB drops below ~665mV: it disables switching, waits ~10ms, then attempts restart. This limits average power dissipation and junction temperature rise, preventing thermal damage while maintaining self-recovery capability once the fault clears.
Is the QFN-8 (3mm×3mm) package lead-free and RoHS-compliant?
Yes - the MPQ4423AGQ-Z is fully lead-free, halogen-free, and compliant with the EU RoHS Directive 2011/65/EU. MPS confirms green status per its Quality Assurance documentation, and the package meets JEDEC MO-220 standards with SnAgCu solder finish.
MPQ4423AGQ-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
MPQ4423AGQ-Z FAQ
1.How can I place an order for MPQ4423AGQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4423AGQ-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-Z reliable?
The price and inventory of MPQ4423AGQ-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-Z is usually 5 days.
3.What payment methods are accepted for MPQ4423AGQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4423AGQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4423AGQ-Z?
MPQ4423AGQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4423AGQ-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-Z?
For technical support, including MPQ4423AGQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4423AGQ-Z requirements.
6.How does Aetrix verify that MPQ4423AGQ-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4423AGQ-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-Z meets industry standards.
7.What is the process for return or replacement of MPQ4423AGQ-Z?
All MPQ4423AGQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4423AGQ-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-Z part is unused and in its original packaging.
Return procedure for MPQ4423AGQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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