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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MPQ4312GRE-AEC1-Z

Name: MPQ4312GRE-AEC1-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ4312GRE-AEC1-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4312GRE-AEC1-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 20-PowerVFQFN

Datasheet:: MPQ4312GRE-AEC1-Z.pdf

Description:: IC REG BUCK ADJ 2A 20QFN

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Product details

Overview

MPQ4312GRE-AEC1-Z from Monolithic Power Systems is a 45V, 2A synchronous step-down DC/DC converter with integrated 48mΩ high-side and 20mΩ low-side MOSFETs, frequency spread spectrum (FSS), and AEC-Q100 Grade 1 qualification. It delivers up to 2A output current across 3.3V–45V input range, supports automotive cold-crank via low-dropout mode, and achieves 1.7μA shutdown quiescent current for battery-sensitive systems such as infotainment head units.

For engineers reviewing the MPQ4312GRE-AEC1-Z datasheet, MPQ4312GRE-AEC1-Z pinout, MPQ4312GRE-AEC1-Z application, or MPQ4312GRE-AEC1-Z equivalent, key selection criteria include its 350kHz–1000kHz configurable switching frequency, open-drain power-good (PG) signal with ±5% window, selectable AAM/FCCM operation modes, and wettable-flank QFN-20 package for automated optical inspection in automotive production.

Technical Context

The MPQ4312GRE-AEC1-Z implements current-mode control with internal compensation, enabling fast transient response under dynamic load steps typical in ADAS camera modules. Its dual-mode operation-Advanced Asynchronous Modulation (AAM) for light-load efficiency and Forced Continuous Conduction Mode (FCCM) for fixed-frequency EMI control-is selected via the MODE pin and validated across -40°C to +150°C junction temperature.

Frequency Spread Spectrum (FSS) reduces peak radiated emissions by dithering fSW ±10%, meeting CISPR25 Class 5 limits without external EMI filters. The device integrates frequency foldback at startup to prevent inductor current runaway and supports multi-phase synchronization via 180° out-of-phase SYNCO output and SYNCIN input compatible with 350kHz–1000kHz external clocks.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.3V to 45V - Supports full automotive battery range including cold-crank (4.5V) and load-dump (42V) transients.
Output Current	2A continuous - Sustained delivery with thermal shutdown at 170°C and 20°C hysteresis for fault recovery.
Quiescent Current	1.7μA in shutdown - Enables always-on subsystems (e.g., CAN wake-up receivers) without draining 12V battery.
Switching Frequency	350kHz to 1000kHz, configurable via FREQ pin resistor - Allows EMI optimization and inductor size trade-off (e.g., 5.6μH @ 470kHz).
Power Good Threshold	95% to 105% of VREF (0.815V) - Provides precise ±5% output voltage monitoring for system reset sequencing.
MOSFET RDS(ON)	HS: 48mΩ, LS: 20mΩ - Minimizes conduction loss at 2A, enabling >90% efficiency at 1A load with 12V_IN/3.3V_OUT.
Minimum On-Time	100ns - Supports high step-down ratios (e.g., 45V→3.3V) without pulse-skipping instability.

Pinout & Package

MPQ4312GRE-AEC1-Z is housed in a wettable-flank QFN-20 (4mm × 4mm) package, enabling solder-joint inspection in automotive SMT lines. Thermal resistance θ_JA is 44°C/W on standard 4-layer PCB, and θ_JC is 9°C/W for heatsink-compatible designs.

Pin/Terminal	Circuit Role	Design Meaning
1 MODE	AAM/FCCM selection	Pull high for fixed-frequency FCCM; pull low for light-load AAM - determines efficiency vs. EMI trade-off.
2 SYNCIN	External clock input	Accepts 350–1000kHz sync signal; enables multi-phase interleaving and EMI reduction via phase offset.
3,12 VIN	Main input supply	Connects to 3.3–45V source; requires local ceramic decoupling to suppress switching noise.
4,5,10,11 PGND	Power ground return	Low-impedance path for high di/dt switch currents; must be tied to thermal pad for thermal performance.
6 BST	Bootstrap supply	Drives high-side MOSFET gate; requires 0.1μF ceramic capacitor between BST and SW nodes.
7,8 SW	Switch node	Connects internal HS/LS FETs; routes to external inductor; critical for layout EMI control.
9 EN	Enable control	Active-high logic: >1V enables, <0.85V shuts down - supports microcontroller-controlled power sequencing.
13 SYNCO	Synchronization output	180° out-of-phase clock; used to synchronize secondary converters in multi-rail systems.
14 PG	Power-good indicator	Open-drain output; requires external pull-up; asserts high only when VOUT is within ±5% of target.
16 VCC	Bias supply	Internal LDO output; powers control circuitry; requires 1μF ceramic decoupling to GND.
17 AGND	Analog ground	Reference for FB, SS, and MODE pins; must be separated from PGND and connected at single point.
18 FB	Feedback input	Sets output voltage via resistor divider; 0.815V reference enables 3.3V, 5V, or custom outputs.
19 SS	Soft-start timing	13μA current source charges external capacitor; controls inrush current ramp rate during startup.
20 FREQ	Frequency setting	Resistor-to-GND sets fSW (e.g., 62kΩ → 470kHz); enables precise EMI band placement.

Key Features

Feature	Design Value
Frequency Spread Spectrum (FSS)	Reduces peak radiated emissions by >10dB in CISPR25 Class 5 bands without added filtering components.
Wettable Flank QFN-20	Enables automated optical inspection (AOI) of solder joints - required for AEC-Q100 automotive manufacturing traceability.
Low-Dropout Mode	Maintains regulation down to VIN = VOUT + 0.5V, supporting cold-crank operation at 4.5V input for 3.3V rail.
Hiccup Over-Current Protection	Enters safe restart cycle upon overcurrent, preventing thermal damage during sustained short-circuit faults.
Thermal Shutdown with Hysteresis	Shuts down at 170°C and resumes at 150°C - prevents cycling near thermal limit during high ambient conditions.

Applications

Automotive Infotainment Head Unit

ADAS Camera Module Power

Use Scenario: Powers SoC, display driver, and audio codec in 12V vehicle infotainment systems with variable load profiles.

IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator supplying core logic rails; manages dynamic load steps during UI rendering and video decode.

Use Value: AAM mode cuts no-load IQ to 18μA, extending runtime in accessory-off state; FSS ensures compliance with OEM EMC requirements.

Use Scenario: Supplies image sensor and ISP in forward-facing ADAS cameras exposed to wide temperature and input voltage swings.

IC Role / Device Role / Timing Role: High-reliability 3.3V buck converter with cold-crank support and PG monitoring for fail-safe boot sequencing.

Use Value: Low-dropout mode sustains 3.3V output during 4.5V cold-crank; ±5% PG window triggers MCU watchdog reset on undervoltage.

Instrument Cluster Display

Automotive Telematics Control Unit (TCU)

Use Scenario: Generates 5V rail for TFT-LCD backlight drivers and microcontroller in digital instrument clusters.

IC Role / Device Role / Timing Role: Main step-down converter with synchronized switching to avoid beat frequencies with display pixel clock.

Use Value: SYNCO output enables phase-aligned switching with display power stage, eliminating visible flicker.

Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in telematics units requiring always-on connectivity.

IC Role / Device Role / Timing Role: Always-on 3.3V supply with ultra-low shutdown current (1.7μA) and wake-on-CAN capability.

Use Value: 1.7μA ISHDN minimizes parasitic drain on vehicle battery during extended parking periods.

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
MPQ4313GRE-AEC1-Z	3A output current, identical pinout and feature set	Higher current headroom for future-proofing or parallel use	Select when design requires >2A margin or anticipates higher load growth.
LM61480QRJNRQ1	3.5A, 42V max input, no FSS, different pinout (16-pin WQFN)	Lacks frequency spread spectrum; requires redesign of PCB layout and EMI filtering	Choose only if FSS is not required and LM61480's 3.5A rating justifies layout change.

Compared with MPQ4313GRE-AEC1-Z, this part offers lower cost and footprint for 2A systems; versus LM61480QRJNRQ1, it provides superior EMI performance and drop-in compatibility in existing MPS-based designs without layout revision.

Availability

MPQ4312GRE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, instrument clusters, and telematics control units requiring stable component supply with AEC-Q100 Grade 1 reliability and wettable-flank inspection capability.

Supply support for MPQ4312GRE-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPQ4312 belongs to MPS's automotive-grade synchronous buck converter product line, designed specifically for harsh automotive environments requiring AEC-Q100 qualification, wide input range, low EMI, and long-term supply stability.

FAQ

What is the purpose of the MODE pin on MPQ4312GRE-AEC1-Z?

The MODE pin selects between Advanced Asynchronous Modulation (AAM) and Forced Continuous Conduction Mode (FCCM). Pulling MODE low enables AAM for highest light-load efficiency; pulling high forces FCCM for consistent switching frequency and predictable EMI behavior. Floating the pin is prohibited and may cause undefined operation.

How does the Frequency Spread Spectrum (FSS) function reduce EMI?

FSS modulates the switching frequency by ±10% around the nominal value, spreading energy across a wider bandwidth and reducing peak amplitudes in conducted and radiated emissions. This allows the MPQ4312GRE-AEC1-Z to meet CISPR25 Class 5 limits without additional EMI filter components in typical automotive layouts.

Can MPQ4312GRE-AEC1-Z operate during automotive cold-crank conditions?

Yes. The device enters low-dropout mode when input voltage falls near the output level, maintaining regulation down to VIN = VOUT + 0.5V. With a 3.3V output, it sustains operation down to ~3.8V input - well within the 4.5V minimum specified for cold-crank per ISO 16750-2.

What is the recommended capacitor value for the SS (soft-start) pin?

A 100nF capacitor on the SS pin yields ~770ms soft-start time (t_SS ≈ C_SS × 0.815V / 13μA). Larger values increase ramp time to limit inrush current in high-capacitance output stages; smaller values reduce startup delay but increase peak input current stress.

Is the PG (power good) signal active-high or open-drain?

The PG pin is an open-drain output requiring an external pull-up resistor to a valid logic voltage (e.g., 3.3V or 5V). It asserts low when VOUT falls below 93% or rises above 106.5% of the feedback reference (0.815V), and high when within the 95–105% window - enabling precise power-rail monitoring for system reset control.

Does MPQ4312GRE-AEC1-Z support synchronization with other converters?

Yes. The SYNCIN pin accepts an external 350–1000kHz clock to lock internal oscillator frequency, while SYNCO outputs a 180° phase-shifted copy. This enables precise multi-phase interleaving across multiple MPQ4312 devices or mixed MPS buck regulators to reduce input ripple and improve thermal distribution.

What is the thermal performance of the QFN-20 wettable flank package?

On a standard 4-layer JEDEC board, the package exhibits θ_JA = 44°C/W and θ_JC = 9°C/W. With proper PCB copper area (≥250mm² thermal pad connection), it sustains 2A continuous output at +85°C ambient without derating. The wettable flank design ensures solder joint integrity verification in automated optical inspection systems.

MPQ4312GRE-AEC1-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 20-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):: 45V

Voltage - Output (Min/Fixed):: 0.815V

Voltage - Output (Max):: 42.75V

Current - Output:: 2A

Frequency - Switching:: 350kHz ~ 1MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 20-QFN (4x4)

MPQ4312GRE-AEC1-Z FAQ

1.How can I place an order for MPQ4312GRE-AEC1-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4312GRE-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 MPQ4312GRE-AEC1-Z reliable?

The price and inventory of MPQ4312GRE-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 MPQ4312GRE-AEC1-Z is usually 5 days.

3.What payment methods are accepted for MPQ4312GRE-AEC1-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4312GRE-AEC1-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4312GRE-AEC1-Z?

MPQ4312GRE-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4312GRE-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 MPQ4312GRE-AEC1-Z?

For technical support, including MPQ4312GRE-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4312GRE-AEC1-Z requirements.

6.How does Aetrix verify that MPQ4312GRE-AEC1-Z is sourced from the original manufacturer or authorized distributors?

All MPQ4312GRE-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 MPQ4312GRE-AEC1-Z meets industry standards.

7.What is the process for return or replacement of MPQ4312GRE-AEC1-Z?

All MPQ4312GRE-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4312GRE-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 MPQ4312GRE-AEC1-Z part is unused and in its original packaging.

Return procedure for MPQ4312GRE-AEC1-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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