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Monolithic Power Systems Inc. MPQ4346GLE-37-AEC1-Z
- Part No.:
- MPQ4346GLE-37-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 17-PowerVFQFN
- Datasheet:
-
MPQ4346GLE-37-AEC1-Z.pdf
- Description:
- IC REG BUCK 3.7V 3A 17QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MPQ4346GLE-37-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter delivering 3A continuous output at fixed 3.7V, with 3.3V–36V input range, 1μA shutdown current, and configurable 350kHz–2.5MHz switching frequency. It integrates 60mΩ HS-FET and 35mΩ LS-FET, supports cold-crank (3.1V) and 42V load dump, and is deployed in automotive infotainment power rails.
For engineers reviewing the MPQ4346GLE-37-AEC1-Z datasheet, MPQ4346GLE-37-AEC1-Z pinout, MPQ4346GLE-37-AEC1-Z application, or MPQ4346GLE-37-AEC1-Z equivalent, key selection criteria include ultra-low quiescent current in sleep mode (3μA), AAM light-load efficiency optimization, PG monitoring accuracy (±3% window), and QFN-17 wettable flank package for automotive-grade solder joint inspection.
Technical Context
This buck regulator uses zero-delay PWM control with internal gate drivers to achieve near-optimal transient response and supports forced CCM or AAM modulation via SYNCIN/MODE pin logic. Its architecture includes integrated bootstrap charging, hiccup-mode over-current protection, and thermal shutdown at 150°C with 20°C hysteresis.
The device implements low-dropout operation during cold-crank by extending duty cycle beyond 90%, while symmetric VIN pinout and Frequency Spread Spectrum (FSS) reduce EMI emissions to meet CISPR25 Class 5 requirements. The PG signal asserts open-drain high only when VOUT remains within 94–106% of nominal 3.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.7V ±1.5% over -40°C to +150°C junction temperature - ensures stable MCU core rail under automotive thermal stress. |
| Input Voltage Range | 3.3V to 36V with 42V load dump survival - accommodates 12V/24V battery systems including transients per ISO 7637-2. |
| Quiescent Current | 3μA in sleep mode (AAM active, no load) - extends battery runtime in always-on vehicle modules. |
| Switching Frequency | Configurable 350kHz–2.5MHz via external resistor - enables EMI tuning and inductor size optimization. |
| Efficiency | Up to 95% at 3A, VIN=12V, VOUT=3.7V - minimizes thermal load in confined automotive enclosures. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Power Good Window | 94–106% of 3.7V (i.e., 3.478V–3.922V) - provides precise system-level power sequencing feedback. |
Pinout & Package
MPQ4346GLE-37-AEC1-Z is housed in a wettable flank QFN-17 (3mm × 4mm) package with exposed thermal pad, optimized for automotive reflow inspection and thermal performance (θJA = 29.2°C/W on MPS EVB).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SS (Pin 1) | Soft-start timing input | 10µA current source charges external capacitor to linearly ramp output voltage, limiting inrush into downstream capacitance. |
| FREQ (Pin 2) | Frequency configuration | Resistor-to-ground sets fSW; e.g., 15kΩ yields ~2.2MHz - critical for noise-sensitive ADAS sensor rails. |
| SYNCIN/MODE (Pin 3) | Sync clock input / modulation mode select | Pull low for AAM (light-load efficiency); pull high for FCCM (low-noise fixed-frequency operation). |
| VIN (Pins 4,11) | Main input supply | Dual pins reduce trace inductance and improve high-current path robustness for 3A load delivery. |
| PGND (Pins 6,10) | Power ground return | Separate low-impedance path for switch node current minimizes ground bounce affecting regulation accuracy. |
| BST (Pin 7) | Bootstrap supply for HS-FET driver | Requires ceramic cap between BST and SW to sustain gate drive above VIN during high-side conduction. |
| SW (Pins 8,9) | Switch node | Connects internal HS/LS FETs; requires low-inductance layout to suppress ringing and EMI. |
| EN (Pin 12) | Enable control | Active-high logic (1V threshold); allows system-level power sequencing with precise 0.85V–1.05V hysteresis. |
| PG (Pin 13) | Power good indicator | Open-drain output requires external pull-up; asserts after 50µs delay once VOUT enters regulation window. |
| VCC (Pin 15) | Bias supply for control circuitry | Internally regulated 5V rail powers gate drivers and logic; decoupling cap essential for stability. |
| AGND (Pin 16) | Analog ground reference | Isolated ground for feedback and error amplifier - must tie to PGND at single point near VOUT capacitor. |
| VOUT (Pin 17) | Output voltage sense point | Direct connection to output capacitor ensures accurate regulation without trace IR drop error. |
Key Features
| Feature | Design Value |
|---|---|
| Wettable flank QFN-17 package | Enables automated optical inspection (AOI) of solder joints per automotive IPC-A-610 standards. |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +150°C operation - suitable for under-hood and instrument cluster environments. |
| Advanced Asynchronous Modulation (AAM) | Reduces light-load IQ to 3μA while maintaining regulation - extends battery life in parked vehicle modes. |
| Symmetric VIN pinout + FSS | Lowers peak EMI amplitude and spreads spectral energy - simplifies compliance with CISPR25 Class 5 limits. |
| Low-dropout high-duty-cycle mode | Maintains regulation down to 3.1V input - sustains power during automotive cold-crank events. |
| Hiccup over-current protection | Shuts down and auto-retries on sustained overload - protects against shorted downstream loads without latch-off. |
Applications
| Automotive Instrument Clusters | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powering TFT LCD display, microcontroller, and CAN transceiver in digital dashboards subject to wide temperature and load transients. IC Role / Device Role / Timing Role: Primary 3.7V buck regulator supplying core logic and interface ICs with tight line/load regulation (<±0.1%). Use Value: 3μA sleep current prevents battery drain during vehicle off-state; PG signal enables safe boot sequencing. | Use Scenario: Providing clean, low-noise 3.7V rail to CMOS image sensors and ISP processors in forward-facing cameras. IC Role / Device Role / Timing Role: High-efficiency, low-EMI DC/DC converter synchronized to system clock to avoid beat frequencies. Use Value: Configurable fSW and FSS minimize conducted/radiated emissions that could corrupt image data integrity. |
| Automotive Infotainment Head Units | Industrial Vehicle Telematics |
Use Scenario: Delivering stable 3.7V to application processors and audio codecs in head units operating across 12V/24V platforms. IC Role / Device Role / Timing Role: Main PMIC buck stage supporting dynamic voltage scaling and multi-rail sequencing. Use Value: 42V load dump tolerance eliminates need for external TVS; wettable flank ensures long-term solder reliability. | Use Scenario: Powering GPS/GNSS modules, cellular modems, and CAN FD controllers in fleet management telematics boxes. IC Role / Device Role / Timing Role: Robust front-end buck converter handling wide input variation and intermittent battery disconnects. Use Value: Cold-crank support (3.1V min) maintains modem connectivity during engine start; AEC-Q100 ensures field longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4346JGLE-37-AEC1-Z | QFN-19 package with additional NC and SYNCO pins; identical electrical specs and 3.7V output. | Supports external clock synchronization via SYNCO output; preferred where multi-rail sync is required. | Select when system-level clock tree coordination is needed; otherwise QFN-17 offers smaller footprint and lower cost. |
| TPS629333RQYR | 3.3V fixed output, 3A, 2.5V–18V input, 1.5μA IQ, but not AEC-Q100 qualified. | Limited to non-automotive industrial or commercial applications due to lack of automotive qualification. | Use only in non-automotive contexts; cannot replace MPQ4346GLE-37-AEC1-Z in AEC-Q100-compliant designs. |
Compared with MPQ4346JGLE-37-AEC1-Z, the QFN-17 variant saves board space and cost without sacrificing performance; versus TPS629333RQYR, it delivers automotive-grade reliability and extended input range essential for vehicle deployment.
Availability
MPQ4346GLE-37-AEC1-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, infotainment head units, and industrial telematics requiring stable component supply with full AEC-Q100 traceability.
Supply support for MPQ4346GLE-37-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.
The MPQ4346 product line targets automotive power conversion with AEC-Q100 qualification, ultra-low IQ, and robust transient handling - engineered specifically for infotainment, cluster, and ADAS subsystems.
FAQ
What is the minimum input voltage supported during cold-crank conditions?
The MPQ4346GLE-37-AEC1-Z operates down to 3.1V input, enabling uninterrupted power delivery during automotive cold-crank events where battery voltage dips below nominal levels. This is achieved via high-duty-cycle mode and optimized control loop response.
How does the AAM mode improve light-load efficiency?
AAM mode reduces switching frequency under light loads, lowering gate drive and switching losses. With typical 3μA quiescent current and pulse-skipping behavior, it extends battery life in always-on vehicle modules without compromising regulation accuracy.
Can the MPQ4346GLE-37-AEC1-Z be synchronized to an external clock?
Yes - the SYNCIN/MODE pin accepts an external clock signal (90–115% of free-running frequency) to synchronize switching, reducing beat frequencies in multi-converter systems. Pulling this pin high also forces FCCM mode for consistent EMI profiles.
What is the purpose of the wettable flank feature in the QFN-17 package?
The wettable flank design exposes vertical copper surfaces on the package edges, enabling automated optical inspection (AOI) of solder fillets during reflow. This meets automotive IPC-A-610 requirements for process validation and long-term solder joint reliability.
Does the device provide reverse current protection?
Yes - the MPQ4346GLE-37-AEC1-Z includes a 4A reverse current limit in FCCM mode, preventing backfeed from the output to input during fault conditions or input disconnection, enhancing system safety in multi-rail architectures.
How is power good (PG) assertion accuracy verified across temperature?
PG threshold is specified as 94–106% of nominal 3.7V with ±1% hysteresis, tested across -40°C to +150°C. Typical characterization shows <±0.3% drift over temperature, ensuring reliable system power sequencing in extreme automotive environments.
What thermal performance can be expected on a standard 4-layer PCB?
On an MPS reference board (2oz copper, 8.3cm×8.3cm, 4-layer), θJA is 29.2°C/W. At 3A load and 12V input, case temperature rise is typically <25°C - well within safe margin before thermal shutdown activates at 150°C junction.
MPQ4346GLE-37-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 17-PowerVFQFN
- 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):
- 3.7V
- Voltage - Output (Max):
- -
- 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:
- 17-QFN (3x4)
MPQ4346GLE-37-AEC1-Z FAQ
1.How can I place an order for MPQ4346GLE-37-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4346GLE-37-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 MPQ4346GLE-37-AEC1-Z reliable?
The price and inventory of MPQ4346GLE-37-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 MPQ4346GLE-37-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4346GLE-37-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4346GLE-37-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4346GLE-37-AEC1-Z?
MPQ4346GLE-37-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4346GLE-37-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 MPQ4346GLE-37-AEC1-Z?
For technical support, including MPQ4346GLE-37-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4346GLE-37-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4346GLE-37-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4346GLE-37-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 MPQ4346GLE-37-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4346GLE-37-AEC1-Z?
All MPQ4346GLE-37-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4346GLE-37-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 MPQ4346GLE-37-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4346GLE-37-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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