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

Monolithic Power Systems Inc. MPQ4409GQBE-AEC1-Z

Name: MPQ4409GQBE-AEC1-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ4409GQBE-AEC1-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4409GQBE-AEC1-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 13-PowerVQFN

Datasheet:: MPQ4409GQBE-AEC1-Z.pdf

Description:: IC REG BUCK ADJ 900MA 13QFN

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Product details

Overview

MPQ4409GQBE-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering 900mA continuous output current from a 4V–24V input, with fixed 2.2MHz switching frequency, integrated 90mΩ/50mΩ MOSFETs, and Power Good (PG) indicator - deployed in automotive infotainment power rails.

For engineers reviewing the MPQ4409GQBE-AEC1-Z datasheet, MPQ4409GQBE-AEC1-Z pinout, MPQ4409GQBE-AEC1-Z application, or MPQ4409GQBE-AEC1-Z equivalent, key selection criteria include AEC-Q100 qualification, wettable flank QFN-13 package, valley-current OCP with hiccup mode, forced CCM operation, and CISPR25 Class 5 EMI compliance for automotive subsystems.

Technical Context

The MPQ4409 operates in fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation across 4V–24V input while maintaining forced continuous conduction mode (FCCM) from no-load to full-load. Its valley-current detection OCP and thermal shutdown (170°C trip, 30°C hysteresis) provide robust fault handling during short-circuit or overload events.

It integrates a 4.9V internal VCC regulator powered from VIN, a bootstrap circuit with dedicated UVLO (2.2V rising), and a 0.807V ±12mV precision feedback reference. The EN/SYNC pin supports both enable/disable control and external clock synchronization from 450kHz to 2.2MHz, with internal 400kΩ pull-down and 6.5V Zener clamping.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4V to 24V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (24V).
Output Current	900mA continuous - sufficient for powering SoC I/O rails, display controllers, or audio codecs in clusters.
Switching Frequency	2.2MHz default, syncable 450kHz–2.2MHz - enables compact LC filter design and avoids AM band interference.
R_DS(ON)	90mΩ (HS) / 50mΩ (LS) - minimizes conduction loss at high duty cycles and improves full-load efficiency.
Feedback Reference	0.807V ±12mV (–40°C to +125°C) - sets precise output voltage with minimal drift over automotive temperature range.
Power Good Threshold	88% of V_FB rising, 83% falling - provides accurate rail monitoring with 5% hysteresis to prevent chatter during marginal conditions.
Thermal Shutdown	170°C trip, 30°C hysteresis - protects die during sustained overload or poor PCB thermal design without latch-up.

Pinout & Package

MPQ4409GQBE-AEC1-Z is housed in a wettable flank QFN-13 (2.5mm × 3mm) package with exposed thermal pad, optimized for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes.

Pin/Terminal	Circuit Role	Design Meaning
1, 2 IN	Main power input	Accepts 4V–24V supply; requires low-ESR ceramic decoupling placed adjacent to pins with wide traces and multiple vias.
3 NC	No connection	Unbonded die pad - must remain unconnected on PCB to avoid parasitic coupling or thermal stress.
4 PG	Open-drain power good	Signals valid regulation (V_OUT ≥ 88% of setpoint); requires external pull-up to V_CC or bias rail.
5 EN/SYNC	Enable & clock sync input	Logic-high enables device; external 450kHz–2.2MHz clock synchronizes switching edge; internal 400kΩ pull-down allows floating disable.
6 FB	Voltage feedback node	Connects to resistor divider tap; internal 0.807V reference enables adjustable outputs from 0.807V; sensitive to noise - minimize trace length and avoid vias.
7 VCC	Internal bias supply	Regulated ~4.9V output; requires 0.1μF–0.22μF ceramic decoupling capacitor placed directly at pin.
8 AGND	Analog ground reference	Reference for error amplifier and logic; internally tied to PGND - no external connection permitted.
9 SW	Switch node	Drives external inductor; high di/dt node - route with wide copper, minimize loop area, and avoid routing under IC.
10 BST	Bootstrap supply	Connects to SW via 0.1μF capacitor and 20Ω series resistor; supplies floating gate drive for HS-FET; critical for duty cycle >65%.
11, 12, 13 PGND	Power ground return	High-current return path for MOSFETs and inductor; connect to large copper pour with multiple thermal vias to inner layers.

Key Features

Feature	Design Value
Forced Continuous Conduction Mode (FCCM)	Maintains fixed 2.2MHz switching across 0–900mA load - eliminates audible noise and reduces output ripple at light loads.
Valley-Current OCP with Hiccup Mode	Detects inductor valley current below threshold and enters periodic restart during hard short - limits average power dissipation and prevents thermal runaway.
CISPR25 Class 5 EMI Compliance	Meets stringent automotive radiated emission limits without external shielding or complex filtering - simplifies EMC validation.
Wettable Flank QFN-13 Package	Exposed side-wall plating enables AOI-compatible solder joint inspection - ensures process reliability for automotive Tier-1 production.
AEC-Q100 Grade 1 Qualification	Qualified for –40°C to +125°C ambient operation with full temperature cycling, HTOL, and ESD testing - certified for engine bay and cabin electronics.

Applications

Automotive Infotainment

Automotive Clusters

Use Scenario: Powers USB-C PD interface, touchscreen controller, and audio codec in head-unit systems.

IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator supplying low-noise, tightly regulated rails with fast transient response to burst data traffic.

Use Value: FCCM operation eliminates load-dependent frequency shift, ensuring consistent EMI profile during video streaming or Bluetooth audio handshaking.

Use Scenario: Supplies microcontroller core voltage and segment driver logic in digital instrument clusters.

IC Role / Device Role / Timing Role: High-reliability point-of-load converter with PG monitoring for system-level power sequencing and fault reporting.

Use Value: AEC-Q100 Grade 1 rating and 170°C thermal shutdown ensure uninterrupted operation during extended high-temperature cabin exposure.

Automotive Telematics

Industrial Power Systems

Use Scenario: Generates 1.8V and 3.3V rails for LTE modem, GNSS receiver, and CAN FD transceiver in telematics control units (TCUs).

IC Role / Device Role / Timing Role: Input-transient-hardened buck converter supporting 4V cold-crank start and 24V load-dump survival per ISO 7637-2.

Use Value: Wide 4V–24V input range and valley-current OCP enable robust operation during vehicle ignition and alternator regulation faults.

Use Scenario: Provides isolated auxiliary power for industrial HMIs, PLC I/O modules, and smart sensors operating in harsh environments.

IC Role / Device Role / Timing Role: Compact, high-efficiency DC/DC stage replacing discrete buck designs in space-constrained DIN-rail enclosures.

Use Value: QFN-13 wettable flank package and –40°C to +125°C junction rating support deployment in unventilated industrial cabinets with ambient extremes.

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
MPQ4420AGQBE-AEC1-Z	2A output current, same 4V–24V input, 2.2MHz, but larger QFN-16 package and higher R_DS(ON) (110mΩ/70mΩ).	Targets higher-power domains like ADAS camera modules or radar SoCs requiring >1A load capability.	Select when output current demand exceeds 900mA; verify PCB layout compatibility with larger footprint and thermal mass.
TPS62095RGTR	2A output, 2.5V–6V input only, 2.25MHz, non-AEC-Q100, no wettable flank, different pinout and PG behavior.	Limited to low-voltage industrial or consumer applications where automotive qualification and wide VIN are not required.	Use only in non-automotive contexts; not drop-in replaceable due to input range mismatch and missing AEC-Q100 certification.

Compared with MPQ4409GQBE-AEC1-Z, MPQ4420AGQBE-AEC1-Z offers higher current capacity at the cost of larger size and reduced efficiency at light loads, while TPS62095RGTR lacks automotive qualification and cannot operate from 12V/24V battery rails - making MPQ4409GQBE-AEC1-Z the sole fit for AEC-Q100-compliant 4V–24V, 900mA applications.

Availability

MPQ4409GQBE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, and telematics systems requiring stable component supply, AEC-Q100 compliance, and wettable flank package assurance.

Supply support for MPQ4409GQBE-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, and global distribution through authorized partners.

The MPQ4409 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for reliable, compact, and EMI-optimized power conversion in safety-critical vehicle subsystems operating across extended temperature and voltage ranges.

FAQ

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

The BST pin supplies the floating gate drive voltage for the high-side MOSFET via a bootstrap capacitor. A 20Ω resistor between SW and BST dampens voltage spikes caused by rapid switching transitions, reducing EMI and preventing false triggering of the internal bootstrap UVLO. Omitting it risks erratic HS-FET turn-on and potential shoot-through.

Does MPQ4409GQBE-AEC1-Z support output voltages below 0.807V?

No - the internal reference is fixed at 0.807V, and the feedback architecture requires V_OUT ≥ 0.807V. Lower outputs are not supported. For sub-0.8V rails, an external reference or post-regulator stage is required. The datasheet explicitly specifies "output adjustable from 0.807V" with no provision for scaling below that threshold.

How does the frequency foldback function during overvoltage or short-circuit conditions?

Frequency foldback reduces switching frequency to ~1.1MHz when input voltage exceeds 21V, during soft-start, or under short-circuit. This lowers peak inductor current and average power dissipation, preventing thermal runaway. It is automatically engaged and requires no external configuration - confirmed in Electrical Characteristics and Operation sections of Rev. 1.0 datasheet.

Can EN/SYNC be driven directly by a 3.3V microcontroller GPIO without external components?

Yes - EN/SYNC has a 1.45V typical rising threshold and 6.5V internal Zener clamp. A 3.3V GPIO safely exceeds the enable threshold and remains within absolute maximum rating (–0.3V to +6V). No pull-up or current-limiting resistor is needed unless driving from >6V sources.

What is the significance of the "wettable flank" feature in the QFN-13 package?

Wettable flank plating on the vertical side walls of the QFN-13 enables automated optical inspection (AOI) of solder fillet formation during reflow. This provides quantitative verification of solder joint integrity - a critical requirement for automotive manufacturing process control and zero-defect quality targets per IATF 16949.

Is the PG signal active-high or open-drain, and what pull-up voltage is recommended?

PG is an open-drain output requiring an external pull-up. The recommended pull-up is to V_CC (nominal 4.9V), though 3.3V or 5V rails are acceptable if within PG's 0.4V sink specification at 4mA. Pull-up values between 10kΩ and 100kΩ balance rise time and power consumption - 47kΩ is commonly used in reference designs.

How does the internal soft-start time affect system power-up sequencing?

The internal soft-start time is fixed at 1.5ms (typical), ramping V_OUT from 10% to 90% of final value. This prevents inrush current and output overshoot, allowing controlled power-up of downstream logic. PG asserts only after V_FB reaches 88% of 0.807V, adding ~90μs delay - enabling precise sequencing with other rails using PG as a ready signal.

MPQ4409GQBE-AEC1-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MPQ

Package/Case:: 13-PowerVQFN

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):: 24V

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

Voltage - Output (Max):: 20.4V

Current - Output:: 900mA

Frequency - Switching:: 450kHz ~ 2.2MHz

Synchronous Rectifier:: Yes

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 13-QFN (2.5x3)

MPQ4409GQBE-AEC1-Z FAQ

1.How can I place an order for MPQ4409GQBE-AEC1-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4409GQBE-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 MPQ4409GQBE-AEC1-Z reliable?

The price and inventory of MPQ4409GQBE-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 MPQ4409GQBE-AEC1-Z is usually 5 days.

3.What payment methods are accepted for MPQ4409GQBE-AEC1-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4409GQBE-AEC1-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4409GQBE-AEC1-Z?

MPQ4409GQBE-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4409GQBE-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 MPQ4409GQBE-AEC1-Z?

For technical support, including MPQ4409GQBE-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4409GQBE-AEC1-Z requirements.

6.How does Aetrix verify that MPQ4409GQBE-AEC1-Z is sourced from the original manufacturer or authorized distributors?

All MPQ4409GQBE-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 MPQ4409GQBE-AEC1-Z meets industry standards.

7.What is the process for return or replacement of MPQ4409GQBE-AEC1-Z?

All MPQ4409GQBE-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4409GQBE-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 MPQ4409GQBE-AEC1-Z part is unused and in its original packaging.

Return procedure for MPQ4409GQBE-AEC1-Z:

1.Submit a request within 90 days.

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

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