My Inquiry
My Account
Monolithic Power Systems Inc. MPQ4321GDE-AEC1-P
- Part No.:
- MPQ4321GDE-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MPQ4321GDE-AEC1-P.pdf
- Description:
- IC REG BUCK ADJ 1A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPQ4321GDE-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 events, and features 1μA shutdown quiescent current - enabling use in always-on automotive infotainment and ADAS power rails.
For engineers reviewing the MPQ4321GDE-AEC1-P datasheet, MPQ4321GDE-AEC1-P pinout, MPQ4321GDE-AEC1-P application, or MPQ4321GDE-AEC1-P equivalent, key selection criteria include its 350kHz–2.5MHz configurable switching frequency, 65ns minimum on-time for high-duty-cycle cold-crank operation, CISPR25 Class 5 EMI compliance, and QFN-12 (2mm×3mm) wettable flank package for automotive-grade solder joint inspection.
Technical Context
The MPQ4321GDE-AEC1-P uses 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 - sustaining >85% efficiency at 100μA load with 12V input and 5V output.
It integrates a precision 0.8V feedback reference (±0.75% over –40°C to +150°C), open-drain power-good output with ±1.5% hysteresis, and thermal shutdown at 160°C–185°C with 20°C hysteresis. The device supports automotive cold-crank down to 3.1V VIN while maintaining regulation via low-dropout mode and 98–99.5% maximum duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V operating; withstands 42V transient load dump per ISO16750 - enables direct battery connection in 12V/24V automotive systems. |
| Output Current | 1A continuous; sustained across full temperature range (–40°C to +150°C) with internal MOSFETs - eliminates need for external power stages. |
| Quiescent Current | 1μA in shutdown; 20μA in sleep mode - extends battery life in always-on vehicle modules like telematics and body controllers. |
| Switching Frequency | Configurable 350kHz–2.5MHz via resistor on FREQ pin; ±10% spread-spectrum modulation - reduces EMI peak emissions for CISPR25 Class 5 compliance. |
| Feedback Reference | 0.800V ±0.75% over –40°C to +150°C - ensures stable output voltage accuracy for safety-critical clusters and ADAS sensors. |
| Minimum On/Off Time | 65ns on-time / 50ns off-time - supports high step-down ratios and cold-crank operation down to 3.1V input without dropout. |
| Thermal Protection | Thermal shutdown at 160°C–185°C with 20°C hysteresis; θJA = 60°C/W on 4-layer PCB - ensures fault-tolerant operation in enclosed automotive ECUs. |
Pinout & Package
MPQ4321GDE-AEC1-P is housed in a wettable flank QFN-12 package (2mm × 3mm, 0.5mm pitch), optimized for automated optical inspection (AOI) of solder joints in automotive production. The exposed thermal pad enhances heat dissipation and requires PCB copper pour connection to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Dual ground pins reduce high-frequency return path impedance; must be connected to low-inductance thermal pad and system PGND plane. |
| 2, 10 VIN | Main input supply | Dual VIN pins internally tied; each requires local 10μF ceramic decoupling to PGND to suppress switching noise and load-dump transients. |
| 3 BOOT | High-side gate driver supply | Connect 0.1μF ceramic capacitor between BOOT and SW to sustain gate drive during high-duty-cycle operation. |
| 4 FREQ | Frequency configuration | Resistor-to-ground sets switching frequency (e.g., 86.6kΩ → 415kHz); enables EMI tuning and inductor size optimization. |
| 5 VCC | Bias regulator output | Internal LDO supplies control circuitry; requires ≥1μF ceramic capacitor to AGND for stability under dynamic load steps. |
| 6 AGND | Analog ground | Separate ground for FB and PG pins; must be routed to PGND at single point near IC to avoid noise coupling into feedback path. |
| 7 FB | Feedback input | 0.8V reference node; connects to resistor divider for adjustable outputs or directly to VOUT for fixed versions - determines regulation accuracy. |
| 8 PG | Power-good indicator | Open-drain output asserts high when VOUT is within 94.5–105.5% of target - used for processor reset sequencing and system health monitoring. |
| 9 EN | Enable control | Logic-level input (0.85V threshold); no internal pull-up/down - requires explicit MCU or PMIC control for safe power-up/power-down sequencing. |
| 12 SW | Switch node | Drives external inductor; high di/dt node requiring tight layout with minimal loop area to limit EMI and voltage ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Load Dump Tolerance | Withstands 42V transients without derating or external TVS - reduces BOM count and board space in front-end power stages. |
| Cold-Crank Support | Operates continuously down to 3.1V VIN with low-dropout mode and 99.5% max duty cycle - maintains headunit or camera power during engine start. |
| EMI Optimization | Symmetric VIN pinout, spread-spectrum modulation, and MeshConnect™ flip-chip packaging - achieves CISPR25 Class 5 radiated/conducted emissions compliance without added filters. |
| Light-Load Efficiency | Advanced Asynchronous Mode (AAM) reduces switching frequency under light loads - sustains >90% efficiency at 1mA output with 12V input. |
| Wettable Flank Packaging | QFN-12 (2mm×3mm) with solderable side walls - enables automated X-ray and AOI verification of solder fillets for zero-defect automotive manufacturing. |
Applications
| Automotive Infotainment | Automotive Clusters |
|---|---|
|
Use Scenario: Powering LCD display, audio DSP, and USB hub in center console head units with direct 12V battery input. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator supplying core logic and interface ICs; handles load dump and cold-crank without brownout. Use Value: Eliminates need for upstream pre-regulator or discrete protection devices - reduces solution size by 35% versus legacy discrete designs. |
Use Scenario: Generating stable 5V rail for TFT-LCD backlight drivers and microcontroller in digital instrument clusters. IC Role / Device Role / Timing Role: High-accuracy, low-noise power source with PG signal for MCU reset coordination and display initialization sequencing. Use Value: 0.75% FB tolerance and ±1.5% PG hysteresis ensure reliable boot-up across –40°C to +125°C ambient - meeting ASIL-B functional safety requirements. |
| Advanced Driver Assistance Systems | Industrial Power Systems |
|
Use Scenario: Supplying image sensor, radar SoC, and CAN transceiver in forward-facing ADAS camera modules. IC Role / Device Role / Timing Role: Point-of-load regulator with ultra-low IQ (1μA shutdown) and fast transient response (<10μs recovery) for wake-on-radar operation. Use Value: 65ns minimum on-time enables stable 3.3V output from 6V cold-crank input - prevents sensor data loss during engine cranking. |
Use Scenario: Replacing linear regulators in DIN-rail mounted PLC I/O modules requiring robust 12V-to-5V conversion. IC Role / Device Role / Timing Role: Industrial-grade buck converter with AEC-Q100 qualification - provides extended temperature reliability and long-term supply continuity. Use Value: QFN-12 wettable flank package and 150°C junction rating support conformal coating and high-reliability deployment in harsh factory environments. |
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-5-AEC1-P | Fixed 5V output version; identical package, pinout, and specs except FB pin internally tied to output. | Eliminates external feedback resistors - simplifies design for fixed-output use cases but removes adjustability. | Select when 5V output is fixed and board space is constrained; not suitable for variable-output or multi-rail designs. |
| TPS62933RTER (TI) | 3.8V–32V input, 3A output, 1.8μA IQ shutdown; smaller 1.5mm×2mm QFN; no load-dump rating or AEC-Q100 Grade-1. | Lacks automotive transient immunity and extended temperature validation - limited to industrial or consumer applications. | Consider only for non-automotive designs where higher current and smaller footprint outweigh load-dump/cold-crank requirements. |
Compared with MPQ4321GDE-5-AEC1-P, the adjustable MPQ4321GDE-AEC1-P offers design flexibility across multiple output voltages but requires two external resistors; versus TPS62933RTER, it delivers proven automotive robustness at the cost of lower output current and larger package - making it the sole choice for AEC-Q100-compliant 1A buck conversion.
Availability
MPQ4321GDE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for MPQ4321GDE-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 over two decades of expertise in DC/DC converters, motor drivers, and LED drivers.
The MPQ4321 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for harsh-temperature, high-transient automotive environments - emphasizing load-dump survival, cold-crank operation, and EMI robustness in compact packages.
FAQ
What is the maximum allowable input voltage for continuous operation?
The MPQ4321GDE-AEC1-P supports continuous operation up to 36V input. Its absolute maximum rating is 42V - validated for automotive load dump per ISO16750-2, but this 42V level is a transient stress rating, not a continuous operating condition. Sustained operation above 36V may trigger overvoltage protection or cause permanent damage.
Does the device require an external bootstrap capacitor?
Yes - a 0.1μF ceramic capacitor must be placed between the BOOT and SW pins. This capacitor supplies the gate drive voltage for the high-side MOSFET during switching transitions. Omitting it causes improper high-side turn-on, leading to regulation failure, excessive heating, or immediate device shutdown.
How is power-good (PG) functionality implemented and what are its thresholds?
The PG pin is an open-drain output that goes high when VOUT is within 94.5% to 105.5% of the nominal regulated voltage, and low when VOUT falls below 93% or rises above 107%. Its 1.5% hysteresis prevents chatter during marginal conditions. A pull-up resistor to a valid supply (e.g., VCC or system 3.3V) is mandatory for proper logic-level signaling.
Can the MPQ4321GDE-AEC1-P operate with input voltage below 3.3V?
No - the specified minimum operating input voltage is 3.3V. While the device can start up from as low as 3.9V and sustain regulation down to 3.1V during cold-crank, it cannot initiate switching or regulate output if VIN remains below 3.3V. Below this, UVLO keeps the device disabled, and no output is generated.
What is the purpose of the dual VIN and dual PGND pins?
Dual VIN pins reduce high-frequency impedance in the input power path and improve transient response during load dump events. Dual PGND pins provide separate low-inductance return paths for power-stage currents and thermal pad conduction - minimizing ground bounce and improving EMI performance and thermal dissipation.
Is the QFN-12 (2mm×3mm) package RoHS and halogen-free compliant?
Yes - MPQ4321GDE-AEC1-P is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status on its official Quality Assurance page, and the device meets JESD204B and AEC-Q100 mechanical and environmental stress test requirements.
How does frequency foldback improve startup reliability?
During startup, frequency foldback temporarily reduces switching frequency when inductor current approaches the peak limit - preventing current runaway and overshoot. This avoids false overcurrent protection triggering and ensures smooth, controlled output voltage ramp-up even with large output capacitors or heavy pre-biased loads.
MPQ4321GDE-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 (2x3)
MPQ4321GDE-AEC1-P FAQ
1.How can I place an order for MPQ4321GDE-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4321GDE-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 MPQ4321GDE-AEC1-P reliable?
The price and inventory of MPQ4321GDE-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 MPQ4321GDE-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ4321GDE-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4321GDE-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4321GDE-AEC1-P?
MPQ4321GDE-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4321GDE-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 MPQ4321GDE-AEC1-P?
For technical support, including MPQ4321GDE-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4321GDE-AEC1-P requirements.
6.How does Aetrix verify that MPQ4321GDE-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ4321GDE-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 MPQ4321GDE-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ4321GDE-AEC1-P?
All MPQ4321GDE-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4321GDE-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 MPQ4321GDE-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ4321GDE-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPQ4321GDE-AEC1-P Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
