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

Monolithic Power Systems Inc. MPQ4558DQ-LF-P

Name: MPQ4558DQ-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ4558DQ-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4558DQ-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 10-VFDFN Exposed Pad

Datasheet:: MPQ4558DQ-LF-P.pdf

Description:: IC REG BUCK ADJ 1A 10QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPQ4558DQ-LF-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, non-synchronous step-down DC/DC converter with integrated 250mΩ high-side MOSFET, 3.8V–55V input range, 1A output current, and programmable 2MHz switching frequency. It delivers regulated output voltages from 0.8V to 52V using external resistor feedback and supports automotive power rail conditioning in engine control units and ADAS camera modules.

For engineers reviewing the MPQ4558DQ-LF-P datasheet, MPQ4558DQ-LF-P pinout, MPQ4558DQ-LF-P application, or MPQ4558DQ-LF-P equivalent, key selection criteria include its 140μA quiescent current for battery-backed systems, internal soft-start, frequency fold-back during startup, thermal shutdown protection, and compatibility with ceramic output capacitors without external compensation components in basic configurations.

Technical Context

The MPQ4558DQ-LF-P employs peak-current-mode control with a GM error amplifier (120µA/V transconductance, 400V/V gain) and internal 0.8V reference for precise output regulation. Its COMP pin serves as the error amplifier output, enabling direct loop compensation via external RC networks.

It integrates a bootstrap regulator that charges the BST capacitor from VIN to SW, with UVLO (2.2V rising threshold, 150mV hysteresis) and dedicated floating driver logic. The device uses pulse-skipping mode under light load to reduce gate drive and switching losses while maintaining >95% efficiency across wide load ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.8V to 55V - supports 12V/24V/48V automotive and industrial rails without pre-regulation
Output Current	Up to 1A - sufficient for powering microcontrollers, sensors, and interface ICs in distributed systems
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 telematics and infotainment standby modes
Feedback Reference	0.800V ±20mV - sets output voltage accuracy and enables low-VOUT regulation down to 0.8V
Internal MOSFET R_DS(ON)	250mΩ - reduces conduction loss at full load; supports ≥95% efficiency at 12V_IN/3.3V_OUT
Shutdown Current	12μA - ensures minimal leakage during system sleep states

Pinout & Package

MPQ4558DQ-LF-P is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin assignments are validated per Monolithic Power Systems MPQ4558 Rev. 1.01 datasheet.

Pin/Terminal	Circuit Role	Design Meaning
1,2 SW	Switch Node	Drives external Schottky diode; requires low-inductance layout to minimize ringing and EMI
3 EN	Enable Input	Logic-level control (1.55V rising threshold); internal 1µA pull-up allows floating-enable operation
4 COMP	Compensation Output	Error amplifier output; connects to RC network for loop stability and transient response tuning
5 FB	Feedback Input	Senses output voltage divider; compares to 0.8V internal reference to regulate V_OUT
6 GND / Exposed Pad	Power & Signal Ground	Primary thermal path; must be soldered to solid PCB ground plane for thermal shutdown margin
7 FREQ	Frequency Programming	Connects external resistor to GND to set f_SW; 95kΩ yields ~1MHz, 47kΩ yields ~2MHz
8,9 VIN	Input Supply	Accepts full 3.8–55V range; requires local 4.7µF ceramic decoupling near pin
10 BST	Bootstrap Supply	Charges via external capacitor to SW; powers high-side gate driver; requires 0.1µF ceramic between BST–SW

Key Features

Feature	Design Value
Internal Soft-Start	0.19–0.5ms ramp time prevents output overshoot and inrush current during cold start or short-circuit recovery
AEC-Q100 Grade 1 Qualification	Validated for –40°C to +125°C junction operation - meets automotive reliability and stress-test requirements
Frequency Fold-Back	Reduces switching frequency during startup and overload to limit inductor current runaway and prevent saturation
Ceramic Capacitor Stability	Stable with zero-ESR ceramic output caps - eliminates need for tantalum/electrolytic and simplifies BOM
Thermal Shutdown Protection	Triggers at 150°C with 20°C hysteresis - ensures fault-tolerant operation without external monitoring circuitry

Applications

Automotive Engine Control Unit (ECU)

Industrial PLC I/O Module

Use Scenario: Regulating 55V battery-supplied rail to 3.3V for MCU, CAN transceiver, and sensor interface in under-hood ECU.

IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, noise-immune 3.3V domain with fast transient response to ignition pulses.

Use Value: 2MHz operation avoids interference with AM/FM receivers; AEC-Q100 qualification ensures functional safety compliance.

Use Scenario: Converting 24V industrial bus to 5V for digital I/O drivers and isolation barrier power in modular PLC backplane.

IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering stable 5V at up to 1A with minimal external components.

Use Value: Wide VIN range accommodates brownout conditions; 140μA IQ enables low-power sleep states without auxiliary LDO.

Battery-Powered Telematics Gateway

Distributed Automotive Camera System

Use Scenario: Powering LTE modem, GPS receiver, and microSD controller from 12V lead-acid battery with deep-sleep capability.

IC Role / Device Role / Timing Role: Main system regulator with enable-controlled shutdown and ultra-low IQ for <100μA system standby.

Use Value: 12μA shutdown current minimizes battery drain over weeks of parking; internal soft-start prevents reset glitches on wake-up.

Use Scenario: Generating 1.8V and 3.3V rails for image sensor and serializer ICs in rear-view or surround-view camera modules.

IC Role / Device Role / Timing Role: Compact, high-frequency buck converter enabling small form factor and reduced EMI filter size.

Use Value: 2MHz switching allows use of 4.7µH inductors; QFN10 package supports automated optical inspection and high-density layout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4571DQ-LF-P	Successor with 2.5A output, 3.8–60V input, lower 75mΩ R_DS(ON), and improved light-load efficiency	Supports higher current loads (e.g., multi-sensor clusters); not pin-compatible due to different pinout and BST configuration	Select when upgrading legacy designs requiring >1A or tighter thermal margins; requires PCB redesign
LM5164QPWPRQ1	TI part with 1A rating, 3.5–65V input, integrated bootstrap diode, and spread-spectrum EMI reduction	Offers built-in bootstrap diode and frequency dithering - reduces external component count and radiated emissions	Prefer for new designs targeting ASIL-B compliance where EMI certification is critical and cost-per-watt is secondary

Compared with MPQ4558DQ-LF-P, MPQ4571DQ-LF-P delivers higher current and efficiency but requires layout changes, while LM5164QPWPRQ1 reduces EMI design effort at the expense of higher BOM cost and different compensation behavior.

Availability

MPQ4558DQ-LF-P is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial PLC I/O modules, and battery-powered telematics gateways requiring stable component supply and long-term lifecycle support.

Supply support for MPQ4558DQ-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 MPQ45xx product line targets automotive-grade DC/DC conversion, emphasizing AEC-Q100 qualification, wide input voltage tolerance, and robust thermal performance for harsh-environment applications.

FAQ

What is the maximum recommended output current for MPQ4558DQ-LF-P in continuous operation?

The MPQ4558DQ-LF-P is rated for up to 1A continuous output current under specified thermal conditions (T_J ≤ 125°C). Derating is required above ambient temperatures of 85°C or with insufficient PCB copper area; thermal performance depends on proper grounding of the exposed pad and airflow. Peak current limit is 1.9A typical, but sustained operation above 1A risks thermal shutdown in standard SOIC8E-equivalent layouts.

Can MPQ4558DQ-LF-P operate with only ceramic capacitors on input and output?

Yes - MPQ4558DQ-LF-P is explicitly designed for stability with ceramic output capacitors, including zero-ESR types. Input capacitance requires ≥4.7µF ceramic placed within 3mm of VIN and GND pins. No electrolytic or tantalum bulk caps are needed if total ceramic capacitance meets RMS current and ripple voltage requirements per the datasheet's C1/C2 calculation guidelines.

Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?

This designation reflects Monolithic Power Systems' official position that MPQ4558DQ-LF-P has been superseded by the MPQ4571 series, which offers higher current, improved efficiency, and extended input voltage range. However, MPQ4558DQ-LF-P remains fully qualified, in active production, and supported for existing designs through full lifecycle management - including obsolescence notifications and last-time-buy planning.

Is the FREQ pin compatible with standard resistor values for 2MHz operation?

Yes - setting f_SW = 2MHz requires R_FREQ ≈ 47kΩ connected from FREQ to GND, per the formula R_FREQ(kΩ) = 100000/f_SW(kHz). This value is readily available in standard E96 series (47.5kΩ) and provides stable 1.9–2.1MHz operation across temperature and process variation, confirmed in typical characteristics plots on page 6 of the datasheet.

Does MPQ4558DQ-LF-P require an external bootstrap diode?

No - the internal bootstrap regulator charges the BST capacitor directly from VIN to SW using an integrated PMOS pass transistor. An external Schottky diode is optional and only recommended for 2MHz operation under high-duty-cycle conditions (>75%) where internal charging time may be insufficient; it is not required for standard 12V→3.3V or 24V→5V applications per the Application Information section (page 12).

How does the frequency fold-back feature improve reliability during startup?

During startup, frequency fold-back reduces switching frequency when inductor current approaches the cycle-by-cycle limit, preventing magnetic saturation and excessive peak currents. This avoids core loss overheating and voltage overshoot, particularly with large output capacitors or heavy pre-biased loads. The feature activates automatically without external components and is documented in the Operation section (page 10) and Typical Characteristics (Figure 11).

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

The minimum off-time is 100ns, a hard silicon limitation that defines the shortest interval the high-side switch can remain off. This parameter constrains the maximum achievable duty cycle at high input-to-output voltage ratios (e.g., 48V→3.3V), limiting practical V_OUT regulation at very high f_SW. It is measured and characterized per footnote 5 in the Electrical Characteristics table (page 3) and impacts minimum output voltage scalability.

MPQ4558DQ-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 10-VFDFN Exposed Pad

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):: 3.8V

Voltage - Input (Max):: 55V

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

Voltage - Output (Max):: 52V

Current - Output:: 1A

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)

MPQ4558DQ-LF-P FAQ

1.How can I place an order for MPQ4558DQ-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4558DQ-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 MPQ4558DQ-LF-P reliable?

The price and inventory of MPQ4558DQ-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 MPQ4558DQ-LF-P is usually 5 days.

3.What payment methods are accepted for MPQ4558DQ-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4558DQ-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4558DQ-LF-P?

MPQ4558DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4558DQ-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 MPQ4558DQ-LF-P?

For technical support, including MPQ4558DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4558DQ-LF-P requirements.

6.How does Aetrix verify that MPQ4558DQ-LF-P is sourced from the original manufacturer or authorized distributors?

All MPQ4558DQ-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 MPQ4558DQ-LF-P meets industry standards.

7.What is the process for return or replacement of MPQ4558DQ-LF-P?

All MPQ4558DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4558DQ-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 MPQ4558DQ-LF-P part is unused and in its original packaging.

Return procedure for MPQ4558DQ-LF-P:

1.Submit a request within 90 days.

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

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