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

Monolithic Power Systems Inc. MPQ4423HGQ-AEC1-P

Name: MPQ4423HGQ-AEC1-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ4423HGQ-AEC1-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4423HGQ-AEC1-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-VDFN

Datasheet:: MPQ4423HGQ-AEC1-P.pdf

Description:: IC REG BUCK ADJ 3A 8QFN

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Product details

Overview

MPQ4423HGQ-AEC1-P from Monolithic Power Systems is a high-efficiency, AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering up to 3A continuous output current. It operates across a 4V–36V input range, features integrated 85mΩ/55mΩ MOSFETs, default 410kHz switching frequency, and supports external clock synchronization from 200kHz to 2.2MHz for automotive power rail regulation.

For engineers reviewing the MPQ4423HGQ-AEC1-P datasheet, MPQ4423HGQ-AEC1-P pinout, MPQ4423HGQ-AEC1-P application, or MPQ4423HGQ-AEC1-P equivalent, key selection criteria include cold-crank duty cycle capability (95% max), Power Good monitoring with 90% V_FB threshold, thermal shutdown at 170°C, and wettable flank QFN-8 package suitability for automated optical inspection in automotive PCB assembly.

Technical Context

The MPQ4423HGQ-AEC1-P employs peak-current-mode control with internal compensation, enabling stable operation with minimal external components. Its current-mode architecture delivers fast transient response and simplifies loop stabilization across wide load and line variations.

It integrates a 5V internal bias regulator powered from VIN, a bootstrap driver with 2.2V UVLO and 150mV hysteresis, and a dedicated hiccup-mode over-current protection that reduces average short-circuit current to mitigate thermal stress during sustained faults.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4V to 36V continuous - supports automotive battery transients including cold-crank down to 4V.
Output Current	3A continuous - sufficient for powering ADAS sensors, infotainment SoCs, and body control modules.
Switching Frequency	Default 410kHz, synchronizable 200kHz–2.2MHz - enables EMI optimization and avoids AM band interference.
Feedback Reference	792mV ±12mV - sets precise output voltage via external resistor divider; enables 0.8V minimum V_OUT.
Thermal Shutdown	170°C activation, 140°C recovery - provides robust die protection with 30°C hysteresis for reliable restart after fault clearance.
Power Good Threshold	Rising at 90% × V_FB, falling at 84% × V_FB - delivers accurate output voltage monitoring with 6% hysteresis for system sequencing.
Max Duty Cycle	95% - ensures regulation during low-input conditions such as automotive cold-crank events.

Pinout & Package

MPQ4423HGQ-AEC1-P is housed in a space-saving, AEC-Q100 qualified QFN-8 (3mm × 3mm) package with wettable flanks for solder joint inspection. The exposed thermal pad enhances thermal performance in automotive environments.

Pin/Terminal	Circuit Role	Design Meaning
1 FB	Feedback Input	Connects to resistor divider tap; regulates output by comparing against 792mV reference; triggers fold-back at <660mV during short-circuit.
2 VCC	Bias Supply Rail	Internal 5V regulator output; requires 0.1–0.22µF ceramic decoupling; powers internal circuitry across full VIN range.
3 EN/SYNC	Enable & Clock Input	Digital enable (1.4V rising threshold); accepts external 200kHz–2.2MHz clock for frequency synchronization.
4 BST	Bootstrap Supply	Drives high-side MOSFET gate; requires capacitor between BST and SW; 20Ω series resistor recommended to suppress SW spikes.
5 GND	System Ground Reference	Common return for output voltage regulation; requires low-impedance PCB connection with multiple vias to internal ground plane.
6 SW	Switch Node	High-frequency switching node connecting internal HS/LS MOSFETs; must be routed with wide copper trace to minimize EMI and conduction loss.
7 IN	Main Input Supply	Accepts 4V–36V input; requires bulk + high-frequency ceramic input capacitors placed adjacent to IN/GND pins.
8 PG	Power Good Output	Open-drain status signal pulled high when V_OUT ≥ 90% of target; asserts low on undervoltage, thermal shutdown, or EN deactivation.

Key Features

Feature	Design Value
Synchronous Rectification	Integrated 85mΩ HS / 55mΩ LS MOSFETs reduce conduction loss and eliminate external diode, improving efficiency >92% at mid-load.
Automotive Cold-Crank Support	95% maximum duty cycle maintains regulation during engine start when battery drops to ~4.5V.
Power-Save Mode	Enables pulse-skipping at light loads to maintain high efficiency down to 1mA output current.
Internal Soft-Start	1.5ms ramp time prevents output overshoot and limits inrush current during power-up sequencing.
Wettable Flank QFN	Facilitates automated optical inspection (AOI) of solder joints per IPC-A-610 Class 3 requirements for automotive production.

Applications

ADAS Camera Module Power

Infotainment System Core Rail

Use Scenario: Powers image sensor, ISP, and interface logic in forward-facing camera systems operating from 9V–16V vehicle battery with cold-crank dips.

IC Role / Device Role / Timing Role: Primary buck regulator generating stable 1.1V/1.8V/3.3V rails with Power Good signaling for processor reset coordination.

Use Value: 95% duty cycle sustains regulation during cranking; hiccup-mode OCP protects against lens motor stall faults without thermal runaway.

Use Scenario: Supplies core voltage to application processors and display controllers in head-unit systems with variable load profiles.

IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with SYNC input synchronized to system clock tree to minimize beat-frequency EMI.

Use Value: 410kHz default frequency avoids AM radio band; Power Good output enables safe boot sequence initiation only after stable V_OUT.

Body Control Unit (BCU)

Electric Power Steering (EPS) MCU Supply

Use Scenario: Generates 5V and 3.3V rails for microcontrollers, CAN transceivers, and LED drivers in door modules and lighting control units.

IC Role / Device Role / Timing Role: Dual-rail capable buck converter supporting adjustable outputs via feedback resistors; PG signal monitors both rails independently.

Use Value: AEC-Q100 Grade 1 qualification ensures operation from −40°C to +125°C ambient; wettable flank package supports AOI in high-reliability SMT lines.

Use Scenario: Provides clean, regulated 3.3V supply to EPS motor control MCU under high-vibration, high-temperature hood conditions.

IC Role / Device Role / Timing Role: Robust buck regulator with thermal shutdown (170°C) and hiccup-mode fault recovery to maintain MCU uptime during intermittent overload.

Use Value: Internal soft-start prevents voltage overshoot during ignition-on transients; low R_DS(ON) MOSFETs minimize self-heating in confined EPS housing.

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
LM61480QRNXTQ1	4.5V–36V input, 8A output, 2.1MHz max frequency; larger QFN-16 package; no wettable flank option.	Higher current capacity suits multi-rail BCU designs but requires more PCB area and layout complexity.	Select when >3A output or higher switching frequency is required; verify thermal design for QFN-16 footprint.
TPS543320RHLT	4.5V–18V input, 3A output, 500kHz–2.2MHz sync range; integrated FETs; no AEC-Q100 qualification.	Lacks automotive qualification; suitable for industrial control but not safety-critical automotive subsystems.	Choose for cost-sensitive non-automotive applications where AEC-Q100 is not mandated.

Compared with LM61480QRNXTQ1 and TPS543320RHLT, MPQ4423HGQ-AEC1-P uniquely balances AEC-Q100 Grade 1 compliance, wettable flank inspection readiness, 3A capability in QFN-8, and cold-crank support-making it optimal for space-constrained, production-grade automotive ECUs requiring zero-defect solder joint verification.

Availability

MPQ4423HGQ-AEC1-P is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head-units, and body control units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MPQ4423HGQ-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ4423H product line targets automotive power conversion, delivering compact, AEC-Q100 qualified buck regulators optimized for cold-crank resilience, EMI control, and automated optical inspection compatibility in Tier 1 production environments.

FAQ

What is the purpose of the BST pin and why is a 20Ω resistor recommended?

The BST pin supplies the floating gate drive voltage for the internal high-side MOSFET via an external bootstrap capacitor. A 20Ω resistor between BST and SW reduces voltage spikes on the switch node during transitions, minimizing EMI and preventing false triggering of the bootstrap UVLO. This resistor value balances spike suppression with minimal efficiency penalty.

How does the MPQ4423HGQ-AEC1-P handle output short-circuit conditions?

Under sustained short-circuit, the device enters hiccup mode: it cycles between brief startup attempts and shutdowns once FB falls below 84% of the reference voltage. This limits average short-circuit current to ~1.5A, reducing thermal stress and enabling safe recovery without external intervention or latch-off behavior.

Can the switching frequency be adjusted without an external clock source?

No-frequency adjustment requires an external clock applied to the EN/SYNC pin. The internal oscillator is fixed at 410kHz (±20%). There is no resistor-programmable or voltage-controlled frequency option; synchronization is the only method to change operating frequency.

What is the significance of the "wettable flank" feature in the QFN-8 package?

Wettable flanks expose solderable metal along the vertical side walls of the QFN package, enabling automated optical inspection (AOI) to verify solder joint integrity on production lines. This meets IPC-A-610 Class 3 requirements for automotive electronics and improves first-pass yield in high-reliability SMT assembly.

Does the MPQ4423HGQ-AEC1-P support adjustable UVLO thresholds?

Yes-the internal UVLO is fixed at 3.5V rising / 3.3V falling, but an external resistor divider between EN and IN allows programmable UVLO. Using the internal EN threshold (1.4V rising), users can scale the effective input turn-on voltage-for example, setting 9V UVLO by selecting appropriate R5/R6 values per the datasheet equations.

Is the PG pin compatible with 5V logic systems?

Yes-the PG pin is open-drain and must be pulled up externally. A 100kΩ resistor to 5V is acceptable; the pin sinks ≤4mA and clamps low at ≤0.3V when active. Ensure the pull-up voltage does not exceed the absolute maximum rating of 6V on the EN/SYNC pin if shared with that node.

MPQ4423HGQ-AEC1-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-VDFN

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):: 4V

Voltage - Input (Max):: 36V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 32.4V

Current - Output:: 3A

Frequency - Switching:: 410kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-QFN (3x3)

MPQ4423HGQ-AEC1-P FAQ

1.How can I place an order for MPQ4423HGQ-AEC1-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4423HGQ-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 MPQ4423HGQ-AEC1-P reliable?

The price and inventory of MPQ4423HGQ-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 MPQ4423HGQ-AEC1-P is usually 5 days.

3.What payment methods are accepted for MPQ4423HGQ-AEC1-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4423HGQ-AEC1-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4423HGQ-AEC1-P?

MPQ4423HGQ-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4423HGQ-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 MPQ4423HGQ-AEC1-P?

For technical support, including MPQ4423HGQ-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4423HGQ-AEC1-P requirements.

6.How does Aetrix verify that MPQ4423HGQ-AEC1-P is sourced from the original manufacturer or authorized distributors?

All MPQ4423HGQ-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 MPQ4423HGQ-AEC1-P meets industry standards.

7.What is the process for return or replacement of MPQ4423HGQ-AEC1-P?

All MPQ4423HGQ-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4423HGQ-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 MPQ4423HGQ-AEC1-P part is unused and in its original packaging.

Return procedure for MPQ4423HGQ-AEC1-P:

1.Submit a request within 90 days.

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

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