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

Monolithic Power Systems Inc. MPQ4561DQ-LF-P

Name: MPQ4561DQ-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ4561DQ-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4561DQ-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-VFDFN Exposed Pad

Datasheet:: MPQ4561DQ-LF-P.pdf

Description:: IC REG BUCK ADJ 1.5A 10QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPQ4561DQ-LF-P from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 300mΩ high-side MOSFET, 2MHz programmable switching frequency, 3.8V–55V input range, and 1.5A output current capability. It delivers regulated power in automotive front-end systems, industrial HV rails, and battery-powered equipment requiring high-voltage conversion with low quiescent current (140μA).

For engineers reviewing the MPQ4561DQ-LF-P datasheet, MPQ4561DQ-LF-P pinout, MPQ4561DQ-LF-P application, or MPQ4561DQ-LF-P equivalent, key selection criteria include its AEC-Q100 qualification, external soft-start control, frequency foldback under light load, thermal shutdown protection, and compatibility with ceramic output capacitors.

Technical Context

The MPQ4561DQ-LF-P implements current-mode PWM control with cycle-by-cycle peak current limiting and internal error amplifier (400V/V gain, 120μA/V transconductance). Its programmable oscillator uses an external resistor on the FREQ pin to set switching frequency from 700kHz to 1.3MHz (typical), while minimum on-time of 100ns constrains maximum duty cycle at high VIN/VOUT ratios.

It features dedicated bootstrap charging via BST–SW capacitor, internal 2.6V regulator for core logic, and precision feedback reference (0.795V typ) with ±3% tolerance over –40°C to +125°C. Shutdown is triggered by EN < 1.3V, VIN UVLO (<2.4V), or junction temperature >150°C with 20°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.8V to 55V - supports direct connection to 12V/24V/48V automotive and industrial bus rails without pre-regulation.
Output Current	Up to 1.5A - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power architectures.
Switching Frequency	Programmable up to 2MHz - enables compact magnetics and avoids AM radio band EMI interference.
Quiescent Current	140μA - extends battery life in always-on vehicle modules and portable instrumentation.
Feedback Reference	0.795V ±3% - sets output voltage accuracy via external resistor divider; enables 0.8V–52V adjustable regulation.
High-Side R_DS(on)	300mΩ max - limits conduction loss at full load; combined with pulse-skipping improves light-load efficiency.
Thermal Shutdown	150°C activation with 20°C hysteresis - prevents permanent damage during overload or poor PCB thermal design.
Soft-Start Time	1.6ms with 10nF capacitor - controls inrush current during startup and short-circuit recovery.

Pinout & Package

MPQ4561DQ-LF-P is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed pad for optimal heat dissipation. The exposed pad must be soldered to a solid GND plane per JEDEC MO-220 standards.

Pin/Terminal	Circuit Role	Design Meaning
1, 2 SW	Switch Node	Drain of internal high-side MOSFET; connects to inductor and Schottky rectifier cathode; requires low-inductance layout.
3 EN	Enable Input	Logic-level control: >1.55V enables operation; <1.3V disables; internal 1µA pull-up allows floating-enable configuration.
4 COMP	Compensation Output	Error amplifier output; connects to RC network for loop stability tuning; clamped between 0.9V and 2.0V during operation.
5 FB	Feedback Input	Senses output voltage via resistive divider; compares to 0.795V reference to regulate V_OUT.
6 GND / Exposed Pad	Power & Signal Ground	Main return path for high-current switching and analog circuits; exposed pad must be connected to thermal GND plane.
7 FREQ	Frequency Programming	Connects to ground via resistor (e.g., 95kΩ for ~1MHz); sets oscillator frequency across temperature and process variation.
8 SS	Soft-Start Control	Accepts external capacitor to control ramp rate of V_OUT; resets during bootstrap UVLO events.
9 VIN	Input Supply	Powers internal regulators and high-side driver; requires local 10µF ceramic decoupling close to pin.
10 BST	Bootstrap Supply	Charges via external capacitor to SW; supplies floating gate driver; requires low-ESR 0.1µF ceramic capacitor.

Key Features

Feature	Design Value
Current-Mode Control	Enables fast transient response and simplifies compensation with single-pole-zero network on COMP pin.
External Soft-Start	Prevents output overshoot and inrush current spikes using user-defined capacitor on SS pin.
Frequency Foldback	Reduces switching frequency under light load to maintain >85% efficiency down to 1mA output current.
AEC-Q100 Qualified	Validated for automotive applications including engine control units and ADAS power domains (Grade 1: –40°C to +125°C).
Ceramic Capacitor Stable	Operates stably with low-ESR ceramic output capacitors-eliminates need for bulk tantalum or electrolytic types.
Thermal Protection	Integrates die-temperature sensing with automatic recovery after cooldown-no external circuitry required.

Applications

Automotive Front-End Power

Industrial HV Rail Conversion

Use Scenario: Powering CAN transceivers, LIN controllers, and sensor signal conditioners from 12V/24V battery rails in passenger vehicles and commercial trucks.

IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V or 5V supply; handles cold-crank (4.5V) and load-dump (60V) transients.

Use Value: AEC-Q100 qualification and 55V absolute max input ensure robustness against automotive electrical disturbances.

Use Scenario: Converting 48V telecom or factory automation bus to 12V intermediate rail for PLC I/O modules and motor drivers.

IC Role / Device Role / Timing Role: High-input-voltage step-down stage enabling compact, efficient point-of-load regulation without isolated pre-conversion.

Use Value: 2MHz operation allows use of sub-10µH inductors, reducing board area and cost versus lower-frequency alternatives.

Battery-Powered Instrumentation

Distributed Power Architecture

Use Scenario: Power management in handheld test equipment and portable medical monitors operating from Li-ion or 9V alkaline batteries.

IC Role / Device Role / Timing Role: Main system regulator providing low-noise 3.3V supply with ultra-low quiescent current during sleep mode.

Use Value: 140μA IQ enables multi-week standby time; shutdown current of 12μA further extends battery life.

Use Scenario: Local DC/DC conversion for FPGA I/O banks, ADC/DAC references, and optical transceiver bias supplies in telecom line cards.

IC Role / Device Role / Timing Role: Non-isolated, high-efficiency buck converter placed near load to minimize IR drop and noise coupling.

Use Value: Adjustable output (0.8V–52V) and external compensation support diverse voltage and stability requirements across subsystems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4572DQ-LF-P	Successor device with improved efficiency, lower R_DS(on) (220mΩ), and extended 60V input rating.	Recommended for new designs requiring higher reliability margin and longer product lifecycle support.	Select MPQ4572 when designing for production beyond 2025 or targeting stricter thermal constraints.
LM5164QPWPRQ1	TI part with similar 65V input, but synchronous rectification, higher IQ (26μA), and integrated boot diode.	Better suited for space-constrained designs where synchronous efficiency above 1A is critical.	Choose LM5164Q1 if synchronous operation and reduced external component count outweigh Monolithic's footprint advantage.

Compared with MPQ4561DQ-LF-P, MPQ4572DQ-LF-P offers higher input voltage margin and lower conduction loss, while LM5164QPWPRQ1 provides synchronous efficiency and integrated bootstrap diode-both require layout and compensation revalidation but enable next-generation performance targets.

Availability

MPQ4561DQ-LF-P is available at Aetrix Electronics and suitable for automotive front-end power, industrial HV rail conversion, and battery-powered instrumentation requiring stable component supply and legacy design continuity.

Supply support for MPQ4561DQ-LF-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 MPQ4561 belongs to MPS's automotive-grade DC/DC converter product line, engineered for high-voltage industrial and automotive applications demanding wide input range, AEC-Q100 compliance, and robust thermal management.

FAQ

Is MPQ4561DQ-LF-P recommended for new designs?

No. Monolithic Power Systems explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ4572" in the datasheet revision 1.12. MPQ4561DQ-LF-P remains available for legacy production and repair, but MPQ4572DQ-LF-P is the designated replacement with improved specs and ongoing support.

What is the function of the BST pin and how should it be routed?

The BST pin supplies gate drive voltage to the internal high-side MOSFET driver via an external bootstrap capacitor connected between BST and SW. It must be routed with a short, low-inductance trace to SW and use a 0.1µF X7R ceramic capacitor placed directly adjacent to the IC. Avoid routing near noisy signals or high-current paths.

Can MPQ4561DQ-LF-P operate with only ceramic capacitors on input and output?

Yes. The MPQ4561DQ-LF-P is specifically designed for ceramic capacitor stability. Its current-mode architecture and internal compensation allow stable operation with low-ESR ceramic input (≥10µF) and output (≥22µF) capacitors-no tantalum or electrolytic types are required.

How does frequency foldback improve light-load efficiency?

Under light load, frequency foldback reduces switching frequency proportionally to load current, decreasing switching losses (proportional to f_SW) and gate driver losses. This maintains >85% efficiency down to ~1mA output, unlike fixed-frequency converters that suffer disproportionate loss at low loads.

What is the maximum achievable output voltage and how is it set?

The MPQ4561DQ-LF-P supports output voltages from 0.8V to 52V, set by an external resistor divider on the FB pin. With V_FB = 0.795V, R1 and R2 are selected using V_OUT = V_FB × (1 + R1/R2); for example, 12V output requires R1/R2 ≈ 14.1, such as R2 = 10kΩ and R1 = 141kΩ.

Does MPQ4561DQ-LF-P include overvoltage protection?

No. MPQ4561DQ-LF-P lacks dedicated output overvoltage protection (OVP). It relies on feedback loop integrity and external circuitry (e.g., crowbar or clamp) for OVP. The internal current limit and thermal shutdown protect against fault conditions, but output voltage runaway due to FB open-circuit must be mitigated externally.

What is the minimum on-time specification and why does it matter?

The minimum on-time is 100ns (typical), limiting the maximum duty cycle at high input-to-output voltage ratios. For example, at 55V input and 3.3V output with 2MHz switching, the theoretical duty cycle is ~6%, requiring ≥300ns on-time-well above the 100ns limit, ensuring reliable operation across the full input range.

MPQ4561DQ-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 10-VFDFN Exposed Pad

Packaging:: Cut Tape (CT)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3.8V

Voltage - Input (Max):: 55V

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

Voltage - Output (Max):: 52V

Current - Output:: 1.5A

Frequency - Switching:: Up to 2MHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-QFN (3x3)

MPQ4561DQ-LF-P FAQ

1.How can I place an order for MPQ4561DQ-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4561DQ-LF-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 MPQ4561DQ-LF-P reliable?

The price and inventory of MPQ4561DQ-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4561DQ-LF-P is usually 5 days.

3.What payment methods are accepted for MPQ4561DQ-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4561DQ-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4561DQ-LF-P?

MPQ4561DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4561DQ-LF-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 MPQ4561DQ-LF-P?

For technical support, including MPQ4561DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4561DQ-LF-P requirements.

6.How does Aetrix verify that MPQ4561DQ-LF-P is sourced from the original manufacturer or authorized distributors?

All MPQ4561DQ-LF-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 MPQ4561DQ-LF-P meets industry standards.

7.What is the process for return or replacement of MPQ4561DQ-LF-P?

All MPQ4561DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4561DQ-LF-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 MPQ4561DQ-LF-P part is unused and in its original packaging.

Return procedure for MPQ4561DQ-LF-P:

1.Submit a request within 90 days.

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

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