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Monolithic Power Systems Inc. MPQ4346GLE-33-AEC1-Z
- Part No.:
- MPQ4346GLE-33-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 17-PowerVFQFN
- Datasheet:
-
MPQ4346GLE-33-AEC1-Z.pdf
- Description:
- IC REG BUCK 3.3V 3A 17QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
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Product details
Overview
MPQ4346GLE-33-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter delivering 3A continuous output at fixed 3.3V, operating from 3.3V to 36V input with 42V load dump tolerance, 1μA shutdown current, and configurable 350kHz–2.5MHz switching frequency - deployed in automotive infotainment power rails.
For engineers reviewing the MPQ4346GLE-33-AEC1-Z datasheet, MPQ4346GLE-33-AEC1-Z pinout, MPQ4346GLE-33-AEC1-Z application, or MPQ4346GLE-33-AEC1-Z equivalent, key selection criteria include cold-crank support (3.1V min VIN), ultra-low IQ sleep mode (3μA), integrated 60mΩ/35mΩ MOSFETs, PG monitoring, and QFN-17 wettable flank packaging for automotive-grade solder joint inspection.
Technical Context
This buck regulator uses zero-delay PWM control with internal high-side and low-side MOSFETs (60mΩ HS, 35mΩ LS) and supports both forced continuous conduction mode (FCCM) and advanced asynchronous modulation (AAM) for light-load efficiency optimization. Its 20ns minimum on-time enables high-duty-cycle operation during automotive cold-crank conditions.
The device integrates a 5V bias regulator (VCC), open-drain power-good (PG) output with ±6% window, soft-start control via external capacitor, and frequency synchronization capability. Thermal shutdown (150°C) and hiccup-mode over-current protection ensure fault-tolerant operation in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.0% over -40°C to +150°C junction temperature |
| Input Voltage Range | 3.3V to 36V; survives 42V transients per ISO 7637-2 Load Dump Pulse 5a |
| Continuous Output Current | 3A at TA ≤ 85°C with proper PCB thermal design; derates above ambient |
| Quiescent Current | 3μA in AAM sleep mode (no switching), 1μA in shutdown - extends battery life in always-on systems |
| Switching Frequency | Configurable 350kHz–2.5MHz via resistor on FREQ pin; supports CISPR 25 Class 5 EMI compliance |
| Thermal Protection | Thermal shutdown at TJ = 150°C with 20°C hysteresis; prevents permanent damage during overload |
| Power Good Accuracy | PG asserts when VOUT is within 94–106% of nominal; enables system-level voltage monitoring |
Pinout & Package
MPQ4346GLE-33-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 4-layer EVB).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SS | Soft-start timing input; 10µA current source sets ramp time with external capacitor |
| 2 | FREQ | Resistor-programmable switching frequency; sets fSW from 350kHz to 2.5MHz |
| 3 | SYNCIN/MODE | Selects FCCM (pull-high) or AAM (pull-low); accepts external sync clock up to 115% of fSW |
| 4, 11 | VIN | Main input supply rail; requires local ceramic decoupling near pin for EMI suppression |
| 5, 10 | PGND | Power ground return for high-current paths; separate from AGND to minimize noise coupling |
| 6 | BST | Bootstrap supply for HS-FET gate driver; requires 0.1µF ceramic capacitor to SW |
| 7, 8 | SW | Switch node connecting internal HS/LS FETs; high di/dt path requiring tight layout |
| 9 | EN | Enable control with 0.85V rising threshold; <0.85V disables regulator and enters 1μA shutdown |
| 12 | SYNCO | Synchronized clock output; phase-aligned with internal oscillator or external SYNCIN signal |
| 13 | PG | Open-drain power-good indicator; requires external pull-up; asserts when VOUT ∈ [3.102V, 3.498V] |
| 14 | DNU | Do-not-use pin; must be connected directly to VCC per datasheet requirement |
| 15 | VCC | Internal 5V bias supply; requires 1µF ceramic decoupling to PGND for stable gate drive |
| 16 | AGND | Analog ground reference for feedback and control circuitry; star-connected to PGND at single point |
| 17 | VOUT | Regulated output sense point; connect directly to 3.3V rail to minimize IR drop in feedback path |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +150°C TJ), including 42V load dump and 3.1V cold-crank support |
| Ultra-low quiescent current | 3μA sleep mode IQ enables >10-year battery standby in always-on telematics modules |
| Integrated power stage | 60mΩ HS-FET + 35mΩ LS-FET eliminates external MOSFETs and reduces BOM count and footprint |
| EMI-optimized architecture | Frequency spread spectrum (FSS), symmetric VIN pinout, and MeshConnect™ flip-chip reduce radiated emissions |
| Robust protection suite | Hiccup OCP, thermal shutdown with hysteresis, input UVLO/OVP, and PG monitoring enable fail-safe operation |
Applications
| Automotive Instrument Cluster | ADAS Camera Module Power |
|---|---|
|
Use Scenario: Powers microcontroller, display driver, and CAN transceiver in digital dashboard under wide input voltage swings (cold crank to load dump). IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and interface ICs with tight voltage regulation and fast transient response. Use Value: Maintains 3.3V output within ±1% across −40°C to +125°C while surviving 42V transients and supporting 3.1V cold-crank without dropout. |
Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera systems requiring low-noise, reliable 3.3V rail. IC Role / Device Role / Timing Role: Point-of-load regulator with PG monitoring to validate power integrity before sensor initialization. Use Value: Achieves >92% efficiency at 1.5A with AAM mode, minimizing self-heating in sealed camera housings. |
| Automotive Infotainment Head Unit | Vehicle Telematics Control Unit |
|
Use Scenario: Generates 3.3V for application processor I/O, audio codec, and USB PHY in head units exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with programmable fSW to avoid AM band interference. Use Value: Configurable 350kHz–2.5MHz switching frequency enables EMI tuning during EMC validation without hardware change. |
Use Scenario: Powers cellular modem, GNSS receiver, and secure element in always-on telematics gateway with extended battery backup. IC Role / Device Role / Timing Role: Ultra-low IQ buck enabling >5-year battery life in sleep mode while maintaining fast wake-up capability. Use Value: 1μA shutdown current and 3μA sleep IQ extend coin-cell or supercapacitor backup duration significantly. |
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-33-AEC1-Z | QFN-19 package with additional NC and SYNCIN pins; identical electrical specs and AEC-Q100 qualification | Requires different PCB footprint and layout; supports more flexible synchronization routing | Select when board layout benefits from extra pin spacing or dedicated SYNCIN routing without sharing MODE function |
| TPS543320RTWR | TI part with 3.5A rating, 4.5V–18V input, no load-dump tolerance, non-AEC-Q100 rated | Limited to non-automotive industrial or consumer applications; lacks cold-crank and 42V surge capability | Only suitable for cost-sensitive non-automotive designs where AEC-Q100 and wide VIN are not required |
Compared with MPQ4346JGLE-33-AEC1-Z, this QFN-17 variant saves PCB area and simplifies routing; versus TPS543320RTWR, it delivers automotive-grade reliability and 36V operation but at higher unit cost and tighter layout constraints.
Availability
MPQ4346GLE-33-AEC1-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term automotive lifecycle support.
Supply support for MPQ4346GLE-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 power management ICs, with over two decades of innovation in DC/DC converters, motor drivers, and LED drivers.
The MPQ4346 series belongs to MPS's automotive-qualified power portfolio, designed specifically for demanding vehicle subsystems requiring high efficiency, ultra-low IQ, and robust transient immunity in compact form factors.
FAQ
What is the minimum input voltage supported during cold-crank conditions?
The MPQ4346GLE-33-AEC1-Z operates down to 3.1V input, meeting automotive cold-crank requirements per ISO 16750-2. Its low-dropout mode maintains regulated 3.3V output even when VIN drops below VOUT, enabling uninterrupted operation during engine start.
Does this part require an external bootstrap capacitor?
Yes - a 0.1µF X7R ceramic capacitor must be placed between BST and SW pins. This capacitor supplies gate drive energy for the high-side MOSFET and must be located adjacent to the BST pin with minimal trace length to ensure reliable switching.
How is power-good (PG) functionality implemented?
PG is an open-drain output that pulls low when VOUT falls outside 94–106% of 3.3V (i.e., <3.102V or >3.498V). It requires an external pull-up resistor to a valid supply rail and provides system-level fault detection without additional monitoring circuitry.
Can the switching frequency be synchronized to an external clock?
Yes - applying a clock signal to the SYNCIN/MODE pin synchronizes internal switching to the external source within ±15% frequency tolerance. When unused, the pin must be pulled high (FCCM) or low (AAM), never left floating.
What thermal performance can be expected on a standard 4-layer PCB?
On an MPS reference 4-layer board (2oz copper, 8.3cm × 8.3cm), θJA is 29.2°C/W. At 3A load and 25°C ambient, junction temperature rise is ~87°C, resulting in TJ ≈ 112°C - well within the 150°C limit and allowing margin for higher ambient conditions.
Is the DNU pin optional or mandatory to connect?
The DNU pin (Pin 14) is mandatory to connect directly to VCC. Leaving it unconnected violates the datasheet requirement and may cause unstable operation or failure to start due to undefined internal bias conditions.
What is the accuracy of the fixed 3.3V output over temperature?
The output voltage is guaranteed at 3.300V ±0.7% (3230mV to 3370mV) across the full −40°C to +150°C junction temperature range, verified by production testing and characterized in the datasheet's Electrical Characteristics table.
MPQ4346GLE-33-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):
- 3.3V
- 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-33-AEC1-Z FAQ
1.How can I place an order for MPQ4346GLE-33-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4346GLE-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 MPQ4346GLE-33-AEC1-Z reliable?
The price and inventory of MPQ4346GLE-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 MPQ4346GLE-33-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4346GLE-33-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4346GLE-33-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4346GLE-33-AEC1-Z?
MPQ4346GLE-33-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4346GLE-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 MPQ4346GLE-33-AEC1-Z?
For technical support, including MPQ4346GLE-33-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4346GLE-33-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4346GLE-33-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4346GLE-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 MPQ4346GLE-33-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4346GLE-33-AEC1-Z?
All MPQ4346GLE-33-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4346GLE-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 MPQ4346GLE-33-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4346GLE-33-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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