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Monolithic Power Systems Inc. MPQ4431GLE-33-AEC1-Z
- Part No.:
- MPQ4431GLE-33-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-VQFN
- Datasheet:
-
MPQ4431GLE-33-AEC1-Z.pdf
- Description:
- IC REG BUCK 3.3V 1A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,387
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Product details
Overview
MPQ4431GLE-33-AEC1-Z from Monolithic Power Systems is a 36V, 1A synchronous step-down DC/DC converter with integrated high-side (90mΩ) and low-side (80mΩ) MOSFETs, fixed 3.3V output, AEC-Q100 Grade-1 qualification, and 10μA sleep-mode quiescent current. It operates across 3.3V–36V input range, supports programmable switching frequency (350kHz–2.5MHz), and delivers automotive-grade reliability for cold-crank and battery-powered systems.
For engineers reviewing the MPQ4431GLE-33-AEC1-Z datasheet, MPQ4431GLE-33-AEC1-Z pinout, MPQ4431GLE-33-AEC1-Z application, or MPQ4431GLE-33-AEC1-Z equivalent, this device is selected for its ultra-low IQ in sleep mode, wettable-flank QFN-16 package for automated optical inspection, AAM/CCM mode selection via SYNC, and integrated PG indicator with ±10% output regulation window.
Technical Context
The MPQ4431GLE-33-AEC1-Z implements current-mode control with valley-current over-current protection and hiccup-mode fault response. Its internal error amplifier compares 0.8V reference against FB (shorted internally for fixed 3.3V output) to generate VCOMP, which directly modulates peak inductor current per cycle.
It features dual operating modes: Advanced Asynchronous Mode (AAM) for light-load efficiency scaling (down to ~10μA IQ), and forced Continuous Conduction Mode (CCM) selectable at startup via SYNC pin logic level. Minimum on-time is 80ns, enabling high VIN/VOUT ratios such as 36V→3.3V at high duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports full automotive battery range including cold-crank (4.5V) and load-dump (36V) transients. |
| Output Voltage | Fixed 3.3V ±2% - internally trimmed; no external feedback resistors required. |
| Continuous Output Current | 1A - sustained delivery with thermal shutdown at 170°C and 20°C hysteresis. |
| Quiescent Current | 10μA in sleep mode - enables >1-year battery life in always-on automotive modules. |
| Switching Frequency | 350kHz to 2.5MHz - programmable via resistor on FREQ pin or synchronized externally via SYNC. |
| Package | QFN-16 (3mm × 4mm) with wettable flanks - supports AOI inspection and improves solder joint reliability. |
| AEC-Q100 Grade | Grade-1 (−40°C to +125°C TJ) - qualified for engine bay and ADAS ECU power rails. |
Pinout & Package
MPQ4431GLE-33-AEC1-Z uses a thermally enhanced QFN-16 (3mm × 4mm) package with exposed thermal pad and wettable flank leads for solder joint inspection. Pin functions are validated per MPS Rev. 1.02 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Synchronization phase select | Drives high for in-phase sync, low for 180° out-of-phase; tie to GND if unused. |
| 2 VIN | Main power input | Accepts 3.3V–36V; requires local 10µF ceramic decoupling to PGND. |
| 3,10 SW | Switch node | Internal connection point of HS/LS MOSFETs; drives external inductor. |
| 4,9 PGND | Power ground | High-current return path; must be connected via multiple vias to inner-layer ground plane. |
| 5 EN | Enable control | Active-high logic (1.05V threshold); enables soft-start and operation when pulled above threshold. |
| 6 SYNC | Frequency sync / mode select | Configures CCM (high) or AAM (low/floating) at startup; accepts 350kHz–2.5MHz external clock. |
| 7 PG | Power good open-drain output | Asserts high when VOUT is within ±10% of 3.3V; requires external pull-up. |
| 8 BIAS | External bias supply input | Accepts 5V–18V to reduce internal regulator loss; float or tie to GND if unused. |
| 11 BST | Bootstrap supply | Connects 0.1µF capacitor between BST and SW to drive HS-FET gate. |
| 12 VCC | Internal bias rail | Supplies control circuitry; requires ≥1µF ceramic capacitor to AGND. |
| 13 AGND | Analog ground reference | Separate low-noise ground for feedback and error amplifier; connect to PGND at single point. |
| 14 SS | Soft-start timing | Internal 0.7ms default; connect external capacitor for longer ramp (10µA constant current source). |
| 15 FB | Feedback input | Internally connected to 3.3V output divider; not accessible in fixed-output variant. |
| 16 FREQ | Frequency programming | Resistor-to-GND sets switching frequency: 180kΩ = 475kHz, 82kΩ = 1MHz, 27kΩ = 2.5MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Wettable flank QFN-16 | Enables automated optical inspection (AOI) of solder joints without X-ray, improving manufacturing yield. |
| Advanced Asynchronous Mode (AAM) | Reduces light-load IQ to 10μA by dynamically scaling switching frequency-critical for always-on telematics modules. |
| Low dropout mode | Maintains regulation down to VIN = VOUT + 0.5V (e.g., 3.8V → 3.3V), supporting cold-crank conditions below 6V. |
| Valley-current OCP with hiccup | Detects inductor current at zero-crossing to prevent runaway; enters low-duty-cycle hiccup mode during short-circuit. |
| Power Good (PG) indicator | Open-drain output asserts high only when VOUT is within ±10% of 3.3V-provides system-level power sequencing confirmation. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Module Power Supply |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in head units with 12V battery input and strict EMC requirements. IC Role / Device Role / Timing Role: Primary 3.3V buck converter delivering 1A with CISPR25 Class 5 radiated/conducted EMI compliance. Use Value: Wettable flank package ensures solder joint integrity under thermal cycling; AAM extends battery backup runtime during key-off. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras mounted in exterior housings. IC Role / Device Role / Timing Role: Fixed 3.3V regulator operating from 9V–16V automotive rail with −40°C to +125°C junction temperature rating. Use Value: AEC-Q100 Grade-1 qualification guarantees reliability in high-vibration, high-temperature environments; low dropout mode sustains operation during cranking. |
| Body Control Module (BCM) | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Powers microcontroller, CAN transceiver, and LIN interface in centralized body electronics units. IC Role / Device Role / Timing Role: Secondary 3.3V supply derived from main 5V rail or directly from battery; provides clean, regulated voltage with PG monitoring. Use Value: 1μA shutdown current minimizes parasitic drain; PG signal enables safe MCU boot sequencing and fault reporting. |
Use Scenario: Supplies torque and position sensors in EPS motor control units where EMI immunity and functional safety are critical. IC Role / Device Role / Timing Role: Isolated 3.3V domain regulator with robust OCP and thermal shutdown-supports ASIL-B system-level requirements. Use Value: Valley-current detection prevents false trips during transient load steps; hiccup mode limits fault energy during connector short events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RHLT | 4.5V–18V input, 3A output, 1.5MHz fixed frequency, no AAM, 15μA IQ | Lacks AEC-Q100 qualification and wettable flank; higher IQ reduces battery life in always-on use cases. | Select only for non-automotive industrial applications requiring >1A output and simpler layout. |
| LM61480QRNXTQ1 | 3.0V–36V input, 8A output, 2.1MHz max, 15μA IQ, AEC-Q100 Grade-1 | Higher current capability and cost; lacks wettable flank and fixed 3.3V option-requires external feedback network. | Choose when scalable power architecture is needed across platforms, accepting added BOM and layout complexity. |
Compared with TPS543320RHLT and LM61480QRNXTQ1, MPQ4431GLE-33-AEC1-Z uniquely combines AEC-Q100 Grade-1, wettable flank QFN, fixed 3.3V output, and 10μA sleep IQ-making it optimal for space-constrained, battery-sensitive automotive modules where BOM count and long-term reliability are prioritized over raw current headroom.
Availability
MPQ4431GLE-33-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply with AEC-Q100 traceability and extended temperature support.
Supply support for MPQ4431GLE-33-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.
The MPQ4431 product line targets automotive power conversion with AEC-Q100 qualification, low-IQ operation, and integrated MOSFETs-designed specifically for next-generation vehicle ECUs needing compact, reliable, and EMI-compliant DC/DC solutions.
FAQ
What is the purpose of the BIAS pin on MPQ4431GLE-33-AEC1-Z?
The BIAS pin accepts an external 5V–18V supply to power the internal 5V regulator, reducing power dissipation and improving efficiency-especially when VIN exceeds 12V. If unused, BIAS must be floated or tied to GND; leaving it unconnected may cause instability due to floating node noise.
Can MPQ4431GLE-33-AEC1-Z operate with input voltage below 3.3V?
No. The absolute minimum input voltage is 3.3V per datasheet specifications. Below this, UVLO prevents startup. During cold-crank, the device maintains regulation down to VIN ≈ VOUT + 0.5V (i.e., ~3.8V), but cannot start or function reliably below 3.3V.
How does the PG pin indicate power-good status?
PG is an open-drain output that pulls high only when VOUT is within ±10% of 3.3V (i.e., 2.97V–3.63V). It includes 30µs deglitching on rising edge and 50µs on falling edge to reject noise. An external pull-up resistor (typically 10kΩ to 3.3V or 5V) is required for proper logic-level signaling.
Is the MPQ4431GLE-33-AEC1-Z pin-compatible with other MPQ4431 variants?
Yes-all MPQ4431 variants (including GL, GL-AEC1, GLE-AEC1, and GLE-33-AEC1) share identical QFN-16 (3mm×4mm) pinout and footprint. Differences are limited to marking, qualification status (AEC-Q100), wettable flank, and fixed output voltage-no PCB redesign is needed for migration.
What thermal performance can be expected in a 4-layer PCB design?
On a JESD51-7 compliant 4-layer board, θJA is 48°C/W and θJC is 11°C/W. With proper thermal pad soldering and 6+ vias to inner ground planes, the device sustains 1A continuous load at TA = +85°C without thermal shutdown. Derating is recommended above 100°C ambient.
Does MPQ4431GLE-33-AEC1-Z support spread-spectrum frequency modulation?
No. The datasheet specifies only fixed-frequency PWM operation or external synchronization (350kHz–2.5MHz). Spread-spectrum modulation is not implemented; EMI reduction relies on optimized layout, integrated MOSFETs, and AAM's variable-frequency light-load behavior.
How is soft-start time configured for the fixed-output version?
The internal soft-start defaults to 0.7ms. To extend it, connect an external capacitor between SS pin and AGND; the MPQ4431 sources a constant 10µA current into the capacitor, yielding tSS ≈ (VREF × CSS) / 10µA, where VREF = 0.8V. Floating SS activates the internal timer.
MPQ4431GLE-33-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-VQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 350kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 16-QFN (3x4)
MPQ4431GLE-33-AEC1-Z FAQ
1.How can I place an order for MPQ4431GLE-33-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4431GLE-33-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 MPQ4431GLE-33-AEC1-Z reliable?
The price and inventory of MPQ4431GLE-33-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 MPQ4431GLE-33-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4431GLE-33-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4431GLE-33-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4431GLE-33-AEC1-Z?
MPQ4431GLE-33-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4431GLE-33-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 MPQ4431GLE-33-AEC1-Z?
For technical support, including MPQ4431GLE-33-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4431GLE-33-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4431GLE-33-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4431GLE-33-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 MPQ4431GLE-33-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4431GLE-33-AEC1-Z?
All MPQ4431GLE-33-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4431GLE-33-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 MPQ4431GLE-33-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4431GLE-33-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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