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Monolithic Power Systems Inc. MPQ4558DQ-LF-Z
- Part No.:
- MPQ4558DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MPQ4558DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,803
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Product details
Overview
MPQ4558DQ-LF-Z from Monolithic Power Systems is a 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 automotive-grade power conversion in AEC-Q100 Grade 1 qualified QFN10 (3mm × 3mm) packaging, supporting battery-powered and high-voltage industrial systems.
For engineers reviewing the MPQ4558DQ-LF-Z datasheet, MPQ4558DQ-LF-Z pinout, MPQ4558DQ-LF-Z application, or MPQ4558DQ-LF-Z equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and confirmed alternative options aligned with production requirements.
Technical Context
The MPQ4558DQ-LF-Z implements current-mode control with a 140μA quiescent current and internal soft-start, enabling stable startup under wide VIN (3.8V–55V) and VOUT (0.8V–52V) conditions. Its 100ns minimum on-time and frequency fold-back prevent inductor current runaway during startup and light-load operation.
It features a dedicated FREQ pin for resistor-programmable switching frequency up to 2MHz, an EN pin with 1.4V–1.7V rising threshold and 320mV hysteresis, and a COMP pin that serves as the error amplifier output with clamped voltage range (0.9V–2.0V) for loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports direct connection to automotive battery (12V/24V/48V systems) and industrial HV rails without pre-regulation. |
| Output Current | Up to 1A - sufficient for powering microcontrollers, sensors, and communication ICs in distributed power architectures. |
| Switching Frequency | Programmable up to 2MHz - enables compact magnetics and avoids AM radio/ADSL EMI bands; requires external RFREQ resistor. |
| Feedback Reference | 0.800V ±20mV - sets precise output regulation via external resistor divider; low tolerance minimizes output drift across temperature. |
| Quiescent Current | 140μA - ensures >1-year battery life in always-on automotive modules (e.g., telematics, CAN gateways) with VIN ≥3.8V. |
| Shutdown Current | 12μA - reduces system standby loss in sleep-mode applications such as ADAS camera modules and infotainment wake-on-CAN. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while allowing safe recovery. |
Pinout & Package
MPQ4558DQ-LF-Z is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high-power density layouts and requires soldering the exposed pad directly to a solid GND plane for optimal thermal performance (θJC = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | Drives external Schottky diode; high dv/dt node requiring tight layout to minimize EMI and ringing. |
| 3 EN | Enable Input | Logic-level control with 1.5V rising threshold; internal 1µA pull-up allows floating-enable configuration. |
| 4 COMP | Error Amplifier Output | Connect RC network here to set loop stability; voltage clamped between 0.9V and 2.0V during operation. |
| 5 FB | Feedback Input | Senses output via resistive divider; referenced to internal 0.8V bandgap; leakage <1.0μA preserves accuracy. |
| 6 GND / Exposed Pad | Power & Signal Ground | Primary return path for high-current switching; exposed pad must be connected to PCB GND plane for thermal integrity. |
| 7 FREQ | Frequency Programming | Resistor-to-GND sets fSW; 95kΩ yields ~1MHz; supports 0.7–1.3MHz typical range per datasheet. |
| 8, 9 VIN | Input Supply | Accepts full 3.8–55V range; requires local 4.7μF ceramic decoupling close to pins to suppress switching noise. |
| 10 BST | Bootstrap Supply | Charges via external capacitor to SW; powers high-side driver; requires low-ESR 0.1μF ceramic between BST–SW. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C junction operation - meets automotive reliability standards for engine bay and ADAS applications. |
| Internal 250mΩ MOSFET | Reduces BOM count and footprint vs. external switch solutions; eliminates gate driver design complexity and layout sensitivity. |
| Stable with ceramic output capacitors | No ESR requirement simplifies capacitor selection - enables use of small, low-profile X7R/X5R MLCCs instead of bulkier tantalum/electrolytic types. |
| Frequency fold-back in light load | Improves efficiency below 10% load by reducing switching losses - critical for battery longevity in intermittent-sensing nodes. |
| 12μA shutdown supply current | Enables ultra-low-power system sleep states - e.g., remote keyless entry receivers or tire pressure monitoring sensors. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering MCU, CAN transceiver, and sensor interface circuitry in door module or lighting controller. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator converting 12V battery rail; handles cold-crank (6V) and load-dump (60V) transients. Use Value: Wide 3.8V–55V input range and AEC-Q100 qualification ensure uninterrupted operation during automotive voltage extremes. |
Use Scenario: Generating isolated 5V logic supply for digital I/O expansion cards in modular PLC backplanes. IC Role / Device Role / Timing Role: Non-isolated buck stage feeding downstream isolated DC/DC; operates from 24V or 48V industrial bus. Use Value: 2MHz programmability allows small inductors (<10µH), reducing board area and enabling dense I/O card stacking. |
| Battery-Powered Telematics Unit | Distributed Telecom Power |
Use Scenario: Power management for LTE/GNSS module in fleet tracking device powered by 3.7V Li-ion with boost-buck front-end. IC Role / Device Role / Timing Role: Secondary buck regulator stepping down boosted 12V rail to 3.3V for modem and GPS ICs. Use Value: 140μA quiescent current extends runtime in GPS-sleep mode; 12μA shutdown enables multi-year deployment. |
Use Scenario: Local 5V supply for optical transceivers and SerDes in 5G small cell baseband units. IC Role / Device Role / Timing Role: Point-of-load regulator fed from 48V intermediate bus; must meet strict EMI limits near RF sections. Use Value: 2MHz operation moves switching harmonics above sensitive RF bands; SOIC8E/QFN10 footprints support layout isolation. |
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-AEC1-LF-Z | Successor with 2.5A output, 3.8V–60V input, lower RDS(ON) (110mΩ), and improved light-load efficiency. | Supports higher current loads (e.g., multi-core SoCs) and wider input transients (e.g., 48V telecom); not drop-in due to different pinout. | Select when upgrading legacy designs or targeting new AEC-Q100 projects requiring >1A output or better thermal margin. |
| LM5164QPWPRQ1 | Texas Instruments part: 1A, 3V–65V, 1.5MHz max, integrated bootstrap diode, no FREQ pin, different compensation architecture. | Eliminates external bootstrap diode requirement but lacks programmable frequency; requires redesign of feedback and compensation networks. | Choose if bootstrap simplicity outweighs frequency flexibility, or if TI ecosystem alignment (WEBENCH, reference designs) is prioritized. |
Compared with MPQ4558DQ-LF-Z, MPQ4571DQ-AEC1-LF-Z offers higher current capability and extended input range at the cost of non-pin-compatibility, while LM5164QPWPRQ1 trades programmability for integrated bootstrap functionality-both require layout and compensation revision but address distinct reliability or integration priorities.
Availability
MPQ4558DQ-LF-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and battery-powered telematics requiring stable component supply despite its "Not Recommended for New Designs" status.
Supply support for MPQ4558DQ-LF-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 analog and power ICs, with core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ4558 belongs to MPS's automotive-qualified buck converter product line, designed specifically for robust, high-voltage power conversion in harsh environments including engine control, ADAS, and vehicle networking systems.
FAQ
Is MPQ4558DQ-LF-Z still in active production?
Yes, MPQ4558DQ-LF-Z remains in active production and available through authorized distributors including Aetrix Electronics. Although marked "Not Recommended for New Designs" in favor of MPQ4571, it continues full manufacturing support with no announced obsolescence date.
What is the maximum achievable output voltage with MPQ4558DQ-LF-Z?
The MPQ4558DQ-LF-Z supports output voltages up to 52V, set by the FB resistive divider. This is limited by the absolute maximum rating of the FB pin (5V) and internal reference (0.8V), requiring R1/R2 ratio ≤64:1 for stable regulation.
Can MPQ4558DQ-LF-Z operate with 2MHz switching without external bootstrap diode?
No - at 2MHz, the internal bootstrap charging time may be insufficient due to reduced off-time. The datasheet explicitly recommends adding an external Schottky diode (e.g., CMSH2-100M) from VIN to BST to ensure reliable high-side driver operation.
Does MPQ4558DQ-LF-Z require special PCB layout for thermal performance?
Yes - the exposed thermal pad (Pin 6) must be soldered to a minimum 100mm² copper pour connected to internal/external GND planes using ≥4 thermal vias (0.3mm diameter, 0.8mm spacing). Failure to do so risks thermal shutdown above 0.7A continuous load.
How does frequency fold-back improve light-load efficiency?
At light loads, MPQ4558DQ-LF-Z reduces switching frequency to zero (pulse-skipping mode), eliminating switching losses and gate drive losses. This raises efficiency from ~65% (at 1mA) to >85%, extending battery life in always-on sensing applications.
What is the minimum recommended output capacitor ESR for stability?
No minimum ESR is required - MPQ4558DQ-LF-Z is optimized for ceramic capacitors with near-zero ESR. Stability is maintained across 10μF–100μF X7R MLCCs; ESR-dependent poles are intentionally avoided in the compensation design.
Is the EN pin compatible with 1.8V logic microcontrollers?
No - the EN rising threshold is 1.4V–1.7V (typ. 1.55V), making it incompatible with 1.8V GPIO without level-shifting. A simple N-channel MOSFET or resistor divider is required to translate 1.8V logic to ≥1.55V enable voltage.
MPQ4558DQ-LF-Z 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-Z FAQ
1.How can I place an order for MPQ4558DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4558DQ-LF-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 MPQ4558DQ-LF-Z reliable?
The price and inventory of MPQ4558DQ-LF-Z 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-Z is usually 5 days.
3.What payment methods are accepted for MPQ4558DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4558DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4558DQ-LF-Z?
MPQ4558DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4558DQ-LF-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 MPQ4558DQ-LF-Z?
For technical support, including MPQ4558DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4558DQ-LF-Z requirements.
6.How does Aetrix verify that MPQ4558DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4558DQ-LF-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 MPQ4558DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ4558DQ-LF-Z?
All MPQ4558DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4558DQ-LF-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 MPQ4558DQ-LF-Z part is unused and in its original packaging.
Return procedure for MPQ4558DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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