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Monolithic Power Systems Inc. MPQ4323CGRHE-AEC1-Z
- Part No.:
- MPQ4323CGRHE-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFQFN
- Datasheet:
-
MPQ4323CGRHE-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,790
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Product details
Overview
MPQ4323CGRHE-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 70mΩ high-side and 50mΩ low-side MOSFETs, delivering 3A continuous output current. It operates from 3.3V to 36V input, tolerates 42V automotive load dump events, and supports cold-crank down to 3.1V VIN - enabling robust power conversion in automotive infotainment and ADAS systems.
For engineers reviewing the MPQ4323CGRHE-AEC1-Z datasheet, MPQ4323CGRHE-AEC1-Z pinout, MPQ4323CGRHE-AEC1-Z application, or MPQ4323CGRHE-AEC1-Z equivalent, key selection criteria include its 350kHz–2.5MHz configurable switching frequency, 1μA shutdown current, CISPR25 Class 5 EMI compliance, and QFN-14 (2.5mm×3.5mm) wettable flank package for automotive-grade solder joint inspection.
Technical Context
The MPQ4323CGRHE-AEC1-Z uses peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its programmable switching frequency (via external resistor on FREQ pin) enables optimization for efficiency, size, or EMI performance across 350kHz–2.5MHz.
It integrates a 5V internal VCC regulator, open-drain power good (PG) with ±5.5% window, forced CCM and low-dropout modes for cold-crank operation, and hiccup-mode over-current protection. Thermal shutdown triggers at 160°C–185°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports full automotive battery range including cold-crank (3.1V min after start-up). |
| Load Dump Tolerance | 42V - meets ISO16750-2 for transient immunity in 12V/24V vehicle systems. |
| Output Current | 3A continuous - sufficient for powering SoCs, displays, and radar modules in ADAS clusters. |
| Switching Frequency | 350kHz to 2.5MHz - externally resistor-programmable for layout flexibility and EMI mitigation. |
| Shutdown Current | 1μA - enables long-term battery backup in always-on automotive subsystems. |
| Power Good Threshold | 94.5%–105.5% of VREF - provides precise output voltage monitoring with deglitch timing (70µs rise / 60µs fall). |
| Thermal Shutdown | 160°C–185°C - protects against sustained overload while allowing safe operation up to +150°C junction temperature. |
Pinout & Package
MPQ4323CGRHE-AEC1-Z is housed in a QFN-14 (2.5mm × 3.5mm) package with wettable flanks for automated optical solder-joint inspection. The exposed thermal pad must be soldered to PCB ground for optimal thermal performance (θJC = 3.6°C/W on MPS reference board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 PGND | Power Ground | Primary return path for high-current switch node; must connect directly to thermal pad and low-impedance GND plane. |
| 2, 10 VIN | Input Supply | Dual-pin input for reduced trace inductance; requires local 10µF ceramic decoupling per pin near package edge. |
| 3 BOOT | Bootstrap Supply | Drives high-side MOSFET gate; requires 0.1µF ceramic capacitor between BOOT and SW pins. |
| 4 FREQ | Frequency Configuration | Resistor-to-ground sets fSW (e.g., 86.6kΩ → 415kHz); enables EMI tuning without changing inductor. |
| 5 VCC | Bias Regulator Output | Internal 5V supply for control circuitry; requires ≥1µF ceramic capacitor placed adjacent to pin. |
| 6, 7 AGND | Analog Ground | Reference for FB, PG, EN; must be star-connected to PGND under IC to minimize noise coupling. |
| 8 FB | Feedback Input | Senses output voltage via resistive divider; 0.8V reference enables adjustable VOUT from 0.8V to 0.95×VIN. |
| 9 PG | Power Good Output | Open-drain signal indicating regulated output; requires external pull-up to system rail (e.g., 3.3V or 5V). |
| 10 EN | Enable Input | Active-high logic control (1.02V threshold); no internal pull-up - must be driven or tied to VIN/VCC. |
| 12 SW | Switch Node | Connection point between HS-FET source and LS-FET drain; critical for EMI layout and snubber placement. |
| 14 NC | No Connection | Internally unconnected; may be tied to GND for mechanical stability but carries no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| MeshConnect™ Flip-Chip Package | Reduces parasitic inductance by 30% vs. wire-bond QFN, improving EMI and transient response. |
| Frequency Spread Spectrum (FSS) | ±10% modulation at 15kHz reduces peak conducted/radiated emissions to meet CISPR25 Class 5. |
| Symmetric VIN Pinout | Dual VIN pins placed opposite each other minimize loop area for high di/dt paths, lowering radiated noise. |
| Hiccup Over-Current Protection | Auto-retry current limiting prevents thermal runaway during short-circuit faults without latch-off. |
| Low-Dropout Mode | Maintains regulation when VIN drops to ≤ VOUT + 0.3V - essential for automotive cold-crank survival. |
Applications
| Automotive Infotainment | Automotive Clusters |
|---|---|
Use Scenario: Powering LCD display, audio DSP, and USB-C PD controllers in head units with wide input transients. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter supplying core logic rails with load dump immunity and low quiescent current. Use Value: Eliminates need for external TVS or pre-regulator stages due to 42V tolerance and cold-crank support. | Use Scenario: Generating stable 3.3V and 5V rails for digital instrument cluster microcontrollers and TFT backlight drivers. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator with PG signaling for system power sequencing and fault reporting. Use Value: Enables compact layout with wettable flanks for AOI inspection and meets ASIL-B functional safety requirements via AEC-Q100 Grade 1 qualification. |
| Advanced Driver Assistance Systems (ADAS) | Industrial Power Systems |
Use Scenario: Supplying vision processing SoCs and radar MMICs in forward-facing camera modules subject to engine cranking and load dump. IC Role / Device Role / Timing Role: Main DC/DC converter with fast transient response (<10µs recovery), low-noise operation, and thermal fault resilience. Use Value: Delivers 3A at >95% efficiency across 8V–18V input, minimizing heat buildup in sealed enclosures. | Use Scenario: Providing isolated auxiliary power in railway signaling or off-highway vehicle control units operating in harsh environments. IC Role / Device Role / Timing Role: Robust industrial-grade buck regulator rated for -40°C to +150°C junction temperature and 42V surge immunity. Use Value: Replaces legacy discrete solutions with integrated MOSFETs and protection features, reducing BOM count by 7+ components. |
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 |
|---|---|---|---|
| MPQ4323CGDE-AEC1-Z | Same die, QFN-12 (2mm×3mm) package with lower thermal resistance (θJA = 60°C/W vs. 48.6°C/W) but smaller copper area. | Better suited for space-constrained modules where footprint < 6mm² is critical and ambient temperature remains < 70°C. | Select when PCB real estate is primary constraint and thermal margin allows smaller package. |
| MPQ4323CGLE-AEC1-Z | Same die, QFN-12 (3mm×4mm) package offering highest power dissipation (3.6W) and lowest θJA (50°C/W) among variants. | Ideal for high-power-density designs requiring >2.5A continuous output with minimal derating at 85°C ambient. | Select when thermal performance dominates over footprint and wettable flanks are not required. |
Compared with MPQ4323CGDE-AEC1-Z, the MPQ4323CGRHE-AEC1-Z offers superior thermal performance (3.7W vs. 3.5W) and wettable flanks for solder-joint inspection, while MPQ4323CGLE-AEC1-Z trades footprint for higher power handling - making the RHE variant optimal for balanced automotive EMI, reliability, and manufacturability requirements.
Availability
MPQ4323CGRHE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor modules, and digital instrument clusters requiring stable component supply, AEC-Q100 qualification, and production-ready packaging with wettable flanks.
Supply support for MPQ4323CGRHE-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MPQ4323C product line delivers ultra-compact, AEC-Q100-qualified buck converters optimized for automotive power systems demanding high efficiency, low EMI, and extreme environmental resilience.
FAQ
What is the minimum input voltage required for startup?
The MPQ4323CGRHE-AEC1-Z has a VIN UVLO rising threshold of 3.4V to 3.9V (typ. 3.65V). Startup occurs only when input rises above this threshold; once running, it sustains regulation down to 3.1V VIN - satisfying automotive cold-crank requirements per ISO16750-2.
How does the frequency spread spectrum (FSS) feature reduce EMI?
FSS modulates the switching frequency by ±10% at 15kHz, spreading energy across a bandwidth instead of concentrating it at harmonics. This lowers peak conducted and radiated emissions by up to 10dB, enabling compliance with CISPR25 Class 5 limits without additional filtering components.
Can the PG pin drive an LED directly?
No - the PG pin is open-drain with a maximum sink current of 1mA and VOL = 0.3V at that load. To drive an LED, an external N-channel MOSFET or bipolar transistor is required, with PG controlling the gate/base and the LED powered from a separate rail through a current-limiting resistor.
What is the purpose of the NC pin (Pin 14)?
Pin 14 is a no-connect terminal with no internal connection. It may be tied to GND for mechanical reinforcement or left floating. It serves no electrical function and must not be used as a thermal pad or signal path.
Does the device support forced continuous conduction mode (FCCM) at light loads?
Yes - FCCM is enabled by pulling the MODE pin high (not present on MPQ4323C; FCCM is default behavior). Unlike pulse-skipping modes, FCCM maintains constant switching frequency and low output ripple across all load conditions, critical for noise-sensitive analog or RF circuits.
How is thermal performance affected by PCB layout?
Thermal resistance θJA drops from 48.6°C/W (JESD51-7) to 33.6°C/W (measured on MPS EVB) with proper 4-layer board design: 2oz copper, thermal vias under the exposed pad (≥9 vias, 0.3mm diameter), and connection to inner ground plane. Poor layout can increase junction temperature by >25°C at 3A load.
Is the FB voltage reference trimmed over temperature?
Yes - the FB reference is 0.800V ±10mV over -40°C to +150°C (0.790V to 0.810V), with typical drift of ±0.5mV/°C. This tight tolerance ensures accurate output regulation across automotive temperature extremes without external calibration.
MPQ4323CGRHE-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-VFQFN
- 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):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 3A
- Frequency - Switching:
- 350kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-QFN (2.5x3)
MPQ4323CGRHE-AEC1-Z FAQ
1.How can I place an order for MPQ4323CGRHE-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4323CGRHE-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 MPQ4323CGRHE-AEC1-Z reliable?
The price and inventory of MPQ4323CGRHE-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 MPQ4323CGRHE-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4323CGRHE-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4323CGRHE-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4323CGRHE-AEC1-Z?
MPQ4323CGRHE-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4323CGRHE-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 MPQ4323CGRHE-AEC1-Z?
For technical support, including MPQ4323CGRHE-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4323CGRHE-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4323CGRHE-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4323CGRHE-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 MPQ4323CGRHE-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4323CGRHE-AEC1-Z?
All MPQ4323CGRHE-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4323CGRHE-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 MPQ4323CGRHE-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4323CGRHE-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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