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Monolithic Power Systems Inc. MPQ4559DQ-AEC1-LF-Z
- Part No.:
- MPQ4559DQ-AEC1-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MPQ4559DQ-AEC1-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,637
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Product details
Overview
MPQ4559DQ-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 qualified, non-synchronous step-down DC/DC converter with integrated 250mΩ high-side MOSFET, delivering 1.5A output current across a 3.8V–55V input range and adjustable 0.8V–52V output. It operates at up to 2MHz switching frequency, features 140μA quiescent current, and includes internal soft-start, frequency foldback, and thermal shutdown-designed for automotive power rails and industrial high-voltage conversion.
For engineers reviewing the MPQ4559DQ-AEC1-LF-Z datasheet, MPQ4559DQ-AEC1-LF-Z pinout, MPQ4559DQ-AEC1-LF-Z application, or MPQ4559DQ-AEC1-LF-Z equivalent, key selection criteria include its AEC-Q100 qualification, 2MHz programmable frequency, 12µA shutdown current, QFN10 (3mm × 3mm) package with exposed pad, and compatibility with ceramic output capacitors without external compensation complexity.
Technical Context
The MPQ4559DQ-AEC1-LF-Z implements current-mode control with a GM error amplifier (120µA/V transconductance, 400V/V gain) and cycle-by-cycle peak current limiting. Its programmable oscillator uses an external resistor on the FREQ pin to set switching frequency from 0.7MHz to 1.3MHz (typ), while minimum on/off times (100ns each) constrain duty-cycle operation at high VIN/VOUT ratios.
It integrates a bootstrap regulator for high-side gate drive, with dedicated UVLO (2.2V rising threshold, 150mV hysteresis) and internal soft-start that ramps a reference voltage from 0V to 2.6V to prevent output overshoot during startup or short-circuit recovery-critical for automotive load-dump and cold-crank environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports 12V/24V/48V automotive and industrial bus inputs, including cold-crank down to 3.8V. |
| Output Current | 1.5A continuous - limited by internal MOSFET RDS(ON) (250mΩ typ) and thermal design in QFN10 package. |
| Switching Frequency | Up to 2MHz (programmable via FREQ pin resistor) - enables compact magnetics and avoids AM radio band EMI. |
| Quiescent Current | 140μA - enables >1-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Feedback Reference | 0.800V ±2% - sets output accuracy; allows precise 3.3V, 5V, or custom rail generation with standard resistor dividers. |
| Shutdown Current | 12μA - ensures minimal leakage during vehicle sleep mode, meeting ISO 16750-2 requirements. |
| Operating Junction Temp | –40°C to +125°C - validated for under-hood automotive placement per AEC-Q100 Grade 1. |
Pinout & Package
MPQ4559DQ-AEC1-LF-Z is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed thermal pad (pin 5), optimized for high-power density and low θJA (50°C/W on 4-layer board). The pinout supports standard buck layout: SW (pins 1–2) connects to inductor and Schottky cathode; BST (pin 10) requires 0.1µF capacitor to SW; FB (pin 4) senses output via resistive divider; EN (pin 3) enables with 1.55V rising threshold.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SW (Switch Node) | High-side MOSFET drain output - connects directly to inductor and Schottky rectifier anode; high dv/dt node requiring tight layout and ground plane clearance. |
| 3 | EN (Enable) | Positive logic enable with 1.55V rising threshold - internal 1µA pull-up allows floating-enable; used for system-level power sequencing. |
| 4 | FB (Feedback) | Resistive divider tap to internal 0.8V reference - sets output voltage; high-impedance input (0.1–1.0µA leakage) minimizes divider current loss. |
| 5 | GND / Exposed Pad | Power and signal ground - exposed pad must be soldered to PCB thermal plane for thermal performance and EMI reduction. |
| 6 | FREQ | Frequency programming node - connects to ground via resistor (e.g., 95kΩ for 1MHz); sets oscillator timing and impacts light-load efficiency. |
| 7, 8 | VIN | Main input supply - powers control circuitry and high-side driver; requires local 4.7µF ceramic decoupling adjacent to pins. |
| 9 | BST | Bootstrap supply for high-side gate driver - requires 0.1µF capacitor between BST and SW to sustain gate voltage during high-duty-cycle operation. |
| 10 | COMP | Error amplifier output - connects to RC network for loop compensation; clamped between 0.9V and 2.0V during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C junction temperature, including HTOL, TC, and ESD testing. |
| Internal 250mΩ high-side MOSFET | Eliminates external switch and reduces BOM count; enables full integration in space-constrained modules like body control units. |
| 2MHz programmable switching frequency | Supports <3mm × 3mm inductors (e.g., 4.7µH Wurth 7447789004), reducing solution footprint by >40% vs. 500kHz designs. |
| Ceramic capacitor stability | Operates stably with low-ESR ceramic output caps (no tantalum/electrolytic required), lowering cost and improving long-term reliability. |
| Frequency foldback at light load | Reduces switching losses below 10% load, maintaining >85% efficiency at 1mA output - critical for always-on vehicle networks. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers 3.3V/5V rails for display controllers, audio codecs, and USB hubs in head units under wide-input automotive conditions (6V–42V). IC Role / Device Role / Timing Role: Primary step-down regulator with AEC-Q100 compliance, providing regulated VDD for SoC peripherals and managing cold-crank transients. Use Value: 12µA shutdown current extends battery backup time; 2MHz operation avoids interference with AM/FM receivers and Bluetooth antennas. | Use Scenario: Generates isolated 12V and 5V supplies for analog input conditioning, digital isolators, and fieldbus transceivers in factory automation cabinets. IC Role / Device Role / Timing Role: High-voltage buck converter accepting 24V/48V industrial bus input, delivering stable outputs despite line surges and ripple. Use Value: 55V absolute max input withstands 48V bus transients (IEC 61000-4-5); 140μA IQ reduces heat buildup in sealed enclosures. |
| Telematics Control Unit (TCU) | Smart Sensor Node (Battery-Powered) |
Use Scenario: Supplies 1.8V core and 3.3V I/O rails for LTE/GNSS SoCs in vehicle tracking devices operating across global 12V/24V fleets. IC Role / Device Role / Timing Role: Main power IC with integrated soft-start and thermal shutdown, enabling robust boot under variable battery states. Use Value: Internal soft-start prevents output overshoot during cold-start; AEC-Q100 qualification ensures longevity in vibration-prone mounting locations. | Use Scenario: Powers ultra-low-power environmental sensors (e.g., CO₂, humidity) in wireless mesh nodes powered by Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Always-on buck regulator with deep shutdown mode, activated only during periodic wake-up bursts. Use Value: 12µA shutdown current enables >5-year battery life; ceramic-capacitor compatibility eliminates electrolytic aging failure modes. |
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-AEC1-LF-Z | Successor device: 2A output, 3.2V–60V input, 1.2MHz fixed frequency, lower IQ (40μA), same QFN10 package. | Higher current capability and extended input range suit next-gen ADAS cameras and radar modules. | Select when upgrading legacy designs requiring higher output current or improved light-load efficiency. |
| LM61480QRNXTQ1 | Texas Instruments part: 8A output, 3.0V–36V input, 2.1MHz fixed frequency, integrated compensation, no external FREQ resistor needed. | Targeted at high-current automotive clusters and domain controllers where layout simplicity outweighs cost sensitivity. | Select when needing >2A output or simplified design-in with internal loop compensation and spread-spectrum EMI reduction. |
Compared with MPQ4559DQ-AEC1-LF-Z, MPQ4572 offers higher current and lower quiescent current in identical packaging, while LM61480QRNXTQ1 provides greater output capability and integrated features at the cost of larger size and higher BOM cost-making MPQ4559 optimal for cost-sensitive, 1.5A-class automotive subsystems where AEC-Q100 compliance and 2MHz operation are primary drivers.
Availability
MPQ4559DQ-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and smart sensor nodes requiring stable component supply, AEC-Q100 qualification, and high-voltage DC/DC conversion.
Supply support for MPQ4559DQ-AEC1-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 over two decades of leadership in DC/DC converters, motor drivers, and LED drivers.
The MPQ45xx product line delivers AEC-Q100 qualified, high-input-voltage buck regulators targeting automotive body electronics, infotainment, and ADAS subsystems where reliability, small form factor, and EMI robustness are essential.
FAQ
Is MPQ4559DQ-AEC1-LF-Z recommended for new designs?
No. Monolithic Power Systems explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ4572" in the datasheet revision 1.01. MPQ4572 is the designated successor with improved specs (2A output, 40μA IQ, 60V max input) and continued active support. MPQ4559 remains available for legacy production and repair, but new designs should adopt MPQ4572 for long-term supply assurance and performance gains.
What is the function of the FREQ pin, and how is switching frequency set?
The FREQ pin accepts an external resistor to ground to program switching frequency from 0.7MHz to 1.3MHz (typical range). Using RFREQ = 95kΩ yields ~1MHz; the formula is RFREQ(kΩ) = 100000 / fSW(kHz). This resistor adjusts the oscillator's timing current, enabling EMI optimization and inductor size trade-offs-critical for automotive AM-band compliance and compact PCB layouts.
Can MPQ4559DQ-AEC1-LF-Z operate with ceramic output capacitors only?
Yes. The MPQ4559 is specifically designed for ceramic capacitor stability, with internal compensation and current-mode control eliminating the need for high-ESR electrolytics or tantalums. A typical design uses 22µF X7R ceramic (e.g., TDK C3225X7R1E226M) with proper layout-reducing component count, improving MTBF, and avoiding capacitance drift over temperature and lifetime.
How does the bootstrap circuit work, and what capacitor is required?
The BST pin supplies the floating gate drive for the internal high-side MOSFET. A 0.1µF ceramic capacitor must be placed between BST and SW pins. During the low-side conduction phase (SW near GND), VIN charges this capacitor through an internal PMOS. At high duty cycles, insufficient charging time may occur-requiring careful inductor selection and layout to maintain ≥2.2V BST-SW voltage and avoid driver UVLO shutdown.
What protection features does MPQ4559DQ-AEC1-LF-Z include?
It integrates thermal shutdown (150°C trip, 130°C hysteresis), frequency foldback during startup/short-circuit, precision enable threshold (1.55V rising), input UVLO (3.0V rising, 2.6V falling), and internal current limiting (2.3A typ). These ensure fault tolerance in automotive environments subject to load dumps, reverse battery, and intermittent shorts-without requiring external protection circuitry.
Does MPQ4559DQ-AEC1-LF-Z support synchronous rectification?
No. MPQ4559DQ-AEC1-LF-Z is a non-synchronous buck converter and requires an external Schottky diode (e.g., B380-13-F) for freewheeling. Its architecture uses only an integrated high-side MOSFET; the low-side path relies on the external diode. Synchronous alternatives (e.g., MPQ4572) integrate both switches-but MPQ4559's diode-based design simplifies thermal management and reduces gate-drive complexity in cost-sensitive applications.
What is the maximum achievable output voltage, and how is it set?
The output is adjustable from 0.8V to 52V using a resistive divider from VOUT to FB. With FB reference = 0.800V ±2%, a 3.3V output requires R1 = 31.6kΩ and R2 = 10kΩ. The upper limit is constrained by the 55V input rating and external component voltage ratings-not by internal circuitry-enabling high-ratio step-downs such as 48V-to-12V or 24V-to-3.3V in single-stage conversion.
MPQ4559DQ-AEC1-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:
- 1.5A
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MPQ4559DQ-AEC1-LF-Z FAQ
1.How can I place an order for MPQ4559DQ-AEC1-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4559DQ-AEC1-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 MPQ4559DQ-AEC1-LF-Z reliable?
The price and inventory of MPQ4559DQ-AEC1-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 MPQ4559DQ-AEC1-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ4559DQ-AEC1-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4559DQ-AEC1-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4559DQ-AEC1-LF-Z?
MPQ4559DQ-AEC1-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4559DQ-AEC1-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 MPQ4559DQ-AEC1-LF-Z?
For technical support, including MPQ4559DQ-AEC1-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4559DQ-AEC1-LF-Z requirements.
6.How does Aetrix verify that MPQ4559DQ-AEC1-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4559DQ-AEC1-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 MPQ4559DQ-AEC1-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ4559DQ-AEC1-LF-Z?
All MPQ4559DQ-AEC1-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4559DQ-AEC1-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 MPQ4559DQ-AEC1-LF-Z part is unused and in its original packaging.
Return procedure for MPQ4559DQ-AEC1-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPQ4559DQ-AEC1-LF-Z Tags
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