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

Monolithic Power Systems Inc. MPQ4571GQB-AEC1-Z

Name: MPQ4571GQB-AEC1-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ4571GQB-AEC1-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4571GQB-AEC1-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 12-VFQFN

Datasheet:: MPQ4571GQB-AEC1-Z.pdf

Description:: IC REG BUCK ADJ 1A 12QFN

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Product details

Overview

MPQ4571GQB-AEC1-Z from Monolithic Power Systems is a fully integrated, AEC-Q100 Grade-1 qualified synchronous buck converter delivering 1A continuous output current with 4.5V–60V input range, 250mΩ/45mΩ internal MOSFETs, and 40μA quiescent current. It serves as the primary DC-DC power stage in automotive infotainment and LED lamp systems requiring cold-crank operation and high efficiency under light load via AAM modulation.

For engineers reviewing the MPQ4571GQB-AEC1-Z datasheet, MPQ4571GQB-AEC1-Z pinout, MPQ4571GQB-AEC1-Z application, or MPQ4571GQB-AEC1-Z equivalent, key selection criteria include its 60V max input rating, QFN-12 wettable flank package, valley-current OCP architecture, and 180° out-of-phase SYNC clock output for multi-rail synchronization.

Technical Context

The MPQ4571GQB-AEC1-Z employs peak-current-mode control with valley-current over-current protection and zero-cross detection for accurate light-load regulation. Its advanced asynchronous modulation (AAM) dynamically scales switching frequency to reduce gate driver and switching losses below 10% load.

It integrates internal compensation, soft-start (0.45ms), power-good indicator with ±8% window, and low-dropout mode enabling stable 5V output down to 4.5V input-critical for automotive cold-crank conditions where VIN may dip to 4V while maintaining regulated VOUT.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 60V - supports full automotive battery range including load dump (48V) and cold crank (4V).
Continuous Output Current	1A - sufficient for powering microcontrollers, sensors, and LED drivers in compact automotive modules.
Internal MOSFET R_DS(ON)	250mΩ (HS) / 45mΩ (LS) - enables >90% efficiency at 12V→5V/1A without external Schottky diode.
Quiescent Current	40μA - minimizes standby power loss in always-on vehicle subsystems like telematics.
Switching Frequency	Configurable 300kHz–2.2MHz via external resistor - allows EMI optimization and small inductor selection (e.g., 4.7μH at 2.2MHz).
Power Good Threshold	±8% of V_REF (0.8V) - provides reliable output monitoring with 70μs rise/fall delay for system sequencing.
Thermal Shutdown	170°C with 25°C hysteresis - protects against sustained overload in sealed enclosures without external thermal sensing.

Pinout & Package

MPQ4571GQB-AEC1-Z is housed in a QFN-12 (2.5mm × 3mm) wettable flank package with exposed thermal pad, optimized for automotive PCB assembly and thermal performance on 4-layer boards (θ_JA = 45°C/W).

Pin/Terminal	Circuit Role	Design Meaning
BST	Bootstrap supply	Connects external capacitor between BST and SW to generate floating gate drive voltage for high-side MOSFET.
SW	Switch node	Drives external inductor; requires wide copper trace to minimize switching loop inductance and EMI.
PG	Power good open-drain output	Signals valid regulation (90–108% of V_REF) with pull-up; asserts low during over/under-voltage faults.
FB	Feedback input	Sets output voltage via resistor divider; also used by PG and UVLO circuits for output monitoring.
FREQ	Frequency setting input	Resistor-to-GND sets f_SW from 300kHz to 2.2MHz; enables EMI spread-spectrum tuning.
VCC	Internal bias supply	Requires ≥1μF ceramic decoupling close to pin; powers control logic and gate drivers independently of VIN.
GND	Ground reference	Must connect to large copper pour tied to input/output capacitor negatives for low-noise operation.
IN	Main power input	Accepts 4.5–60V; place local ceramic capacitor ≤2mm from pin to suppress switching transients.
EN	Enable control	Logic-high (>1.45V) enables converter; floating or low disables with 2μA shutdown current.
CCM/SYNCO	Mode select & sync output	Pull to GND via 10–300kΩ for forced CCM; float for AAM; outputs 180° out-of-phase clock for multi-phase sync.
NC (9,10)	No connection	Internally unconnected; recommended to tie to GND for improved thermal conduction and EMI shielding.

Key Features

Feature	Design Value
Wettable flank QFN-12 package	Enables automated optical inspection (AOI) of solder joints in automotive production lines.
AEC-Q100 Grade-1 qualification	Validated for operation from −40°C to +125°C ambient, meeting automotive reliability requirements.
Valley-current OCP with hiccup SCP	Detects overcurrent at switch turn-off point to prevent runaway; enters safe restart cycle during short circuit.
Low-dropout mode	Maintains regulation when VIN drops to 4.5V - essential for engine start-up scenarios in 12V systems.
Internal 0.45ms soft-start	Prevents inrush current into output capacitors; eliminates need for external timing components.

Applications

Automotive Infotainment

Automotive Lamps and LEDs

Use Scenario: Powering head-unit SoCs, display drivers, and audio amplifiers in vehicles with wide battery voltage swings.

IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator with cold-crank support and low-I_Q for always-on wake-up circuitry.

Use Value: Maintains stable output during 4V cold-crank dips and survives 48V load dumps without external TVS.

Use Scenario: Driving interior ambient lighting, dashboard backlighting, and exterior LED lamps.

IC Role / Device Role / Timing Role: Constant-voltage DC-DC stage feeding LED driver ICs or PWM dimming controllers.

Use Value: High efficiency across 10mA–1A load range reduces thermal stress in sealed lamp housings.

Automotive Motor Control

Industrial Power Systems

Use Scenario: Supplying gate drivers and logic for BLDC motor controllers in HVAC actuators and seat adjusters.

IC Role / Device Role / Timing Role: Local 5V rail generator with fast transient response to handle PWM-induced load steps.

Use Value: Peak-current control delivers <10μs recovery from 0→1A load step, minimizing voltage droop.

Use Scenario: Providing isolated auxiliary power in industrial gateways and CAN-based sensor nodes.

IC Role / Device Role / Timing Role: Input-flexible buck converter accepting 24V/48V field bus inputs for 3.3V/5V logic rails.

Use Value: 60V rating eliminates need for pre-regulator stages in brownout-prone factory environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM61480-Q1	Higher 3.5A output, 3.5V–36V input, no AAM mode, fixed 2.1MHz f_SW	Better suited for higher-current motor drivers; lacks light-load efficiency optimization.	Select when >1A output or tighter EMI control via fixed-frequency CCM is required.
TPS54560-Q1	1A output, 3.5V–60V input, 3.5μA shutdown I_Q, no wettable flank, older architecture	Lower thermal performance in QFN; no SYNC output or AAM; limited cold-crank margin.	Choose only if legacy design reuse or TI ecosystem compatibility outweighs efficiency and layout advantages.

Compared with LM61480-Q1 and TPS54560-Q1, MPQ4571GQB-AEC1-Z uniquely balances ultra-low 2μA shutdown current, AAM-enabled light-load efficiency, and wettable flank manufacturability-making it optimal for space-constrained, always-on automotive modules where thermal headroom and EMI compliance are critical.

Availability

MPQ4571GQB-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, LED lighting, and motor control applications requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for MPQ4571GQB-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 for automotive, industrial, and consumer markets.

The MPQ4571 belongs to MPS's AEC-Q100-qualified automotive DC-DC converter product line, designed specifically for harsh-environment power conversion in infotainment, lighting, and body electronics where input transients, thermal constraints, and long-term reliability are paramount.

FAQ

What is the minimum input voltage required for MPQ4571GQB-AEC1-Z to regulate a 5V output?

The device maintains regulation down to 4.5V input in low-dropout mode, supporting automotive cold-crank events where battery voltage dips to 4V. At VIN = 4.5V, it delivers full 1A output at 5V with typical efficiency >75%, verified per datasheet Figure 12 (Dropout vs. Input Voltage).

How does the CCM/SYNCO pin function in synchronization mode?

When configured as SYNC output (pin left floating), CCM/SYNCO delivers a 180° out-of-phase clock signal referenced to the internal oscillator. This allows precise interleaving with another MPQ4571 or compatible converter to reduce input ripple and EMI without external timing components.

Is an external compensation network required for MPQ4571GQB-AEC1-Z?

No. The MPQ4571GQB-AEC1-Z features fully internal compensation, eliminating external Type-II or Type-III networks. Stability is guaranteed across all operating conditions with only standard input/output capacitors and inductor, reducing BOM count and layout complexity.

What protection features prevent damage during automotive load dump?

The device withstands 48V load dump transients due to its 65V absolute maximum VIN rating and integrated input UVLO hysteresis (500mV). Combined with robust 2.5A peak current limit and thermal shutdown at 170°C, it operates safely without external TVS diodes in most 12V automotive applications.

Can MPQ4571GQB-AEC1-Z be used in non-automotive industrial applications?

Yes. While AEC-Q100 qualified, its 4.5–60V input range, 1A output, and -40°C to +125°C junction temperature rating make it suitable for industrial PLCs, IoT gateways, and railway equipment where wide-input, high-reliability DC-DC conversion is needed.

What is the purpose of the NC pins (9 and 10) on the QFN-12 package?

Pins 9 and 10 are no-connect terminals. MPS recommends tying them to GND in PCB layout to improve thermal dissipation through the exposed pad and reduce radiated emissions by enhancing ground plane integrity near the switching node.

MPQ4571GQB-AEC1-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MPQ

Package/Case:: 12-VFQFN

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):: 4.5V

Voltage - Input (Max):: 60V

Voltage - Output (Min/Fixed):: 1V

Voltage - Output (Max):: 54V

Current - Output:: 1A

Frequency - Switching:: 400kHz ~ 2.2MHz

Synchronous Rectifier:: Yes

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 12-QFN (2.5x3)

MPQ4571GQB-AEC1-Z FAQ

1.How can I place an order for MPQ4571GQB-AEC1-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4571GQB-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 MPQ4571GQB-AEC1-Z reliable?

The price and inventory of MPQ4571GQB-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 MPQ4571GQB-AEC1-Z is usually 5 days.

3.What payment methods are accepted for MPQ4571GQB-AEC1-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4571GQB-AEC1-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4571GQB-AEC1-Z?

MPQ4571GQB-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4571GQB-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 MPQ4571GQB-AEC1-Z?

For technical support, including MPQ4571GQB-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4571GQB-AEC1-Z requirements.

6.How does Aetrix verify that MPQ4571GQB-AEC1-Z is sourced from the original manufacturer or authorized distributors?

All MPQ4571GQB-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 MPQ4571GQB-AEC1-Z meets industry standards.

7.What is the process for return or replacement of MPQ4571GQB-AEC1-Z?

All MPQ4571GQB-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4571GQB-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 MPQ4571GQB-AEC1-Z part is unused and in its original packaging.

Return procedure for MPQ4571GQB-AEC1-Z:

1.Submit a request within 90 days.

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

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