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Monolithic Power Systems Inc. MPQ4321GLE-AEC1-P
- Part No.:
- MPQ4321GLE-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MPQ4321GLE-AEC1-P.pdf
- Description:
- IC REG BUCK ADJ 1A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
MPQ4321GLE-AEC1-P 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 1A continuous output current. It operates from 3.3V to 36V input, tolerates 42V automotive load dump transients, and features 1μA shutdown quiescent current-enabling use in always-on automotive infotainment and ADAS power rails.
For engineers reviewing the MPQ4321GLE-AEC1-P datasheet, MPQ4321GLE-AEC1-P pinout, MPQ4321GLE-AEC1-P application, or MPQ4321GLE-AEC1-P equivalent, key selection criteria include its 350kHz–2.5MHz configurable switching frequency, -40°C to +150°C junction temperature rating, wettable-flank QFN-12 (3mm×4mm) package, and CISPR25 Class 5 EMI compliance for automotive ECU designs.
Technical Context
The MPQ4321GLE-AEC1-P implements peak current mode control with frequency foldback during startup to prevent inductor current runaway. Its advanced asynchronous mode (AAM) dynamically scales switching frequency under light loads to minimize gate-driving and switching losses-achieving >90% efficiency at 10mA output across 8V–36V input.
It integrates a 0.8V reference feedback amplifier, open-drain power-good (PG) output with ±5.5% window (94.5%–105.5%), and dual over-current protection: hiccup-mode LS valley current limit (1–2A) and HS peak current limit (1.5–2.6A). 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 nominal; withstands 42V transient per ISO16750 load dump-supports full automotive battery range including cold-crank (3.1V min). |
| Output Current | 1A continuous; enabled by integrated 70mΩ HS / 50mΩ LS MOSFETs and optimized thermal resistance (θJA = 50°C/W, θJC = 7.5°C/W). |
| Quiescent Current | 1μA in shutdown; 20μA in sleep mode-extends battery life in always-on vehicle modules like telematics and sensors. |
| Switching Frequency | Configurable 350kHz–2.5MHz via external resistor on FREQ pin; supports spread-spectrum modulation for CISPR25 Class 5 EMI compliance. |
| Feedback Reference | 0.8V ±1% over -40°C to +150°C-enables precise output regulation for 3.3V, 5V, or adjustable rails using external resistor divider. |
| Power-Good Threshold | PG asserts high when VOUT is within 94.5%–105.5% of target; deasserts below 93% or above 107%-provides reliable system power sequencing. |
| Operating Temperature | Junction range -40°C to +150°C; AEC-Q100 Grade-1 qualified-validated for under-hood and dashboard-mounted automotive applications. |
Pinout & Package
MPQ4321GLE-AEC1-P uses a wettable-flank QFN-12 package (3mm × 4mm), optimized for automated optical inspection (AOI) and robust solder joint reliability in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Dual low-inductance ground paths for high-frequency return currents; must be connected to solid ground plane beneath IC. |
| 2, 10 VIN | Main input supply | Two parallel VIN pins reduce IR drop and EMI; each requires local 1µF ceramic decoupling to PGND. |
| 3 BOOT | High-side gate driver supply | Connect 0.1µF ceramic capacitor between BOOT and SW to sustain gate drive during HS conduction. |
| 4 FREQ | Frequency configuration | Resistor-to-ground sets switching frequency: 86.6kΩ → 415kHz, 34.8kΩ → 1MHz, 15kΩ → 2.2MHz. |
| 5 VCC | Bias regulator output | Internal LDO supplies control circuitry; requires ≥1µF ceramic capacitor to AGND for stability. |
| 6 AGND | Analog ground | Reference ground for FB, PG, EN; must be star-connected to PGND at single point near IC. |
| 7 FB | Feedback input | 0.8V reference node; connect to voltage divider midpoint for adjustable outputs or directly to VOUT for fixed versions. |
| 8 PG | Power-good indicator | Open-drain output; requires external pull-up to monitored rail (e.g., 3.3V or 5V) for system reset/sequencing. |
| 9 EN | Enable control | Active-high logic: <0.85V disables (1μA IQ), >1.02V enables; no internal pull-up-must be driven or pulled externally. |
| 12 SW | Switch node | Connection point between HS source and LS drain; routes high di/dt current-requires tight layout with minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade robustness | 42V load dump survival, 3.1V cold-crank operation, and -40°C to +150°C TJ rating meet AEC-Q100 Grade-1 requirements. |
| Ultra-low quiescent power | 1μA shutdown current and 20μA sleep-mode IQ enable >10-year battery standby in always-on vehicle modules. |
| EMI-optimized architecture | Spread-spectrum modulation, symmetric VIN pinout, and MeshConnect™ flip-chip packaging achieve CISPR25 Class 5 compliance. |
| Thermal performance | Wettable-flank QFN-12 (3mm×4mm) delivers 3.6W power dissipation and 34.3°C/W θJC (top-side) for compact heatsinking. |
| Flexible regulation | Adjustable output (via FB divider) or factory-fixed 5V option; PG output enables safe power sequencing in multi-rail systems. |
Applications
| Automotive Infotainment | Instrument Clusters |
|---|---|
|
Use Scenario: Powering SoC, display drivers, and audio codecs in head units with wide input voltage swings during engine start-stop cycles. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator supplying core logic and interface I/O rails. Use Value: 42V load dump tolerance prevents field failures during alternator transients; low IQ extends backup battery life during ignition-off states. |
Use Scenario: Supplying microcontroller, TFT LCD bias, and CAN transceiver in digital instrument panels exposed to under-dash thermal stress. IC Role / Device Role / Timing Role: High-reliability 3.3V step-down converter operating continuously across -40°C to +105°C ambient. Use Value: AEC-Q100 qualification and 150°C max junction temperature ensure functional safety compliance; wettable flanks support AOI for zero-defect manufacturing. |
| ADAS Camera Modules | Industrial Vehicle Telematics |
|
Use Scenario: Providing stable 1.2V/1.8V core and 3.3V I/O power to image signal processors and MIPI interfaces in surround-view cameras. IC Role / Device Role / Timing Role: Secondary buck stage following front-end 12V–5V conversion, delivering low-noise, tightly regulated power. Use Value: 65ns minimum on-time enables high VIN/VOUT ratios (e.g., 12V→1.2V at 2.2MHz); PG output synchronizes ISP boot sequence. |
Use Scenario: Powering GPS/GNSS receivers, cellular modems, and secure MCU in fleet management gateways mounted in truck cabins. IC Role / Device Role / Timing Role: Primary 5V buck converter supporting long-duration battery-backed operation during vehicle shutdown. Use Value: 1μA shutdown current enables >5-year battery life in maintenance-free tracking units; spread-spectrum reduces EMI coupling into RF front-ends. |
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 |
|---|---|---|---|
| MPQ4321GDE-AEC1-P | Same die, but in smaller QFN-12 (2mm×3mm) package; lower thermal dissipation (3.5W vs. 3.6W) and higher θJA (60°C/W). | Preferred for space-constrained modules where board area is critical and power density ≤0.8W/mm² is acceptable. | Select GDE variant only if PCB real estate is constrained and thermal margin allows reduced copper pour; otherwise GLE offers superior thermal headroom. |
| TI LM61480-Q1 | 1.5A rated, 3.3V–36V input, 15µA IQ (vs. 20µA typical), but lacks 42V load dump rating and CISPR25 Class 5 certification. | Suitable for non-safety-critical body electronics, but not validated for direct replacement in load-dump-exposed front-end rails. | Choose LM61480-Q1 only for cost-sensitive, non-load-dump applications; MPQ4321GLE-AEC1-P remains mandatory where ISO16750-2 compliance is required. |
Compared with MPQ4321GDE-AEC1-P, the GLE variant provides 0.1W higher power dissipation and 10°C/W lower θJA-critical for sustained 1A operation in sealed enclosures. Versus LM61480-Q1, it trades 0.5A current headroom for guaranteed 42V transient immunity and pre-validated EMI performance.
Availability
MPQ4321GLE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, and ADAS camera modules requiring stable component supply with AEC-Q100 traceability and long-term production continuity.
Supply support for MPQ4321GLE-AEC1-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 power management ICs, with design centers in the US, China, and Taiwan.
The MPQ4321 product line targets automotive power conversion, delivering compact, AEC-Q100-qualified buck regulators that simplify front-end DC/DC design while meeting stringent EMI and reliability requirements.
FAQ
What is the maximum allowable input voltage for continuous operation?
The MPQ4321GLE-AEC1-P supports continuous operation up to 36V input. Its absolute maximum rating is 42V-valid only for automotive load dump transients per ISO16750-2, not steady-state use. Exceeding 36V continuously risks exceeding thermal limits and violating AEC-Q100 lifetime reliability models.
How does the frequency foldback feature improve startup reliability?
During startup, frequency foldback reduces switching frequency when output voltage is low-limiting peak inductor current and preventing saturation or overcurrent trip. This ensures controlled soft-start into heavy capacitive loads without triggering hiccup-mode protection.
Can the PG pin be left floating if not used?
No. The PG pin must be either connected to a pull-up resistor (e.g., 10kΩ to VOUT) or actively driven. Floating PG may cause undefined logic states, interfere with system power sequencing, or induce noise coupling into adjacent analog traces due to its open-drain structure.
What is the purpose of the two VIN pins (pins 2 and 10)?
Pins 2 and 10 are internally bonded to the same VIN net and provide parallel current paths to reduce impedance and high-frequency voltage spikes. Each requires a dedicated 1µF ceramic decoupling capacitor placed as close as possible to minimize switching loop inductance and EMI.
Does the device support fixed-output configurations?
Yes. While MPQ4321GLE-AEC1-P is the adjustable version (FB pin used), MPS also offers fixed-output variants (e.g., MPQ4321GDE-5-AEC1-P for 5V). The GLE part requires external resistor divider on FB to set output voltage; no internal trimming is performed.
How is thermal performance affected by the wettable flank package?
The wettable flank feature enables automated optical inspection of solder joints, improving manufacturing yield-but does not alter thermal resistance. Thermal performance is defined by the QFN-12 (3mm×4mm) footprint and copper thermal pad area, delivering θJA = 50°C/W (JESD51-7) and θJC = 7.5°C/W (case bottom).
Is spread-spectrum modulation enabled by default?
Yes. Spread-spectrum modulation is active whenever the device is switching and cannot be disabled. It operates at 15kHz with ±10% frequency deviation-reducing peak EMI amplitudes to meet CISPR25 Class 5 conducted and radiated emission limits without external filters.
MPQ4321GLE-AEC1-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- 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:
- 1A
- 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:
- 12-QFN (3x4)
MPQ4321GLE-AEC1-P FAQ
1.How can I place an order for MPQ4321GLE-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4321GLE-AEC1-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 MPQ4321GLE-AEC1-P reliable?
The price and inventory of MPQ4321GLE-AEC1-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4321GLE-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ4321GLE-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4321GLE-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4321GLE-AEC1-P?
MPQ4321GLE-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4321GLE-AEC1-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 MPQ4321GLE-AEC1-P?
For technical support, including MPQ4321GLE-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4321GLE-AEC1-P requirements.
6.How does Aetrix verify that MPQ4321GLE-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ4321GLE-AEC1-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 MPQ4321GLE-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ4321GLE-AEC1-P?
All MPQ4321GLE-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4321GLE-AEC1-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 MPQ4321GLE-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ4321GLE-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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