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Monolithic Power Systems Inc. MPQ4559DN-LF-Z
- Part No.:
- MPQ4559DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MPQ4559DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:10,739
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Product details
Overview
MPQ4559DN-LF-Z from Monolithic Power Systems is an AEC-Q100-qualified, non-synchronous step-down DC/DC converter with integrated 250 mΩ high-side MOSFET, delivering up to 1.5 A output current across a 3.8 V to 55 V input range and adjustable 0.8 V to 52 V output voltage. It operates at up to 2 MHz with programmable frequency via external resistor, features 140 µA quiescent current, and supports automotive and industrial power rails.
For engineers reviewing the MPQ4559DN-LF-Z datasheet, MPQ4559DN-LF-Z pinout, MPQ4559DN-LF-Z application, or MPQ4559DN-LF-Z equivalent, key selection criteria include its wide VIN range, AEC-Q100 qualification, thermal shutdown behavior, frequency foldback during startup, and compatibility with ceramic output capacitors in space-constrained 3 mm × 3 mm QFN10 or SOIC8E packages.
Technical Context
The MPQ4559DN-LF-Z implements current-mode control with a transconductance error amplifier (120 µA/V) and COMP-pin-based loop compensation, enabling fast transient response and stable operation with diverse output capacitor ESR values. Its internal soft-start ramps a reference voltage from 0 V to 2.6 V to prevent output overshoot during startup and short-circuit recovery.
It uses pulse-skipping mode under light load to reduce switching and gate-driving losses, with frequency foldback preventing inductor current runaway at startup. The bootstrap driver charges the BST–SW capacitor to ~5 V using a dedicated regulator, requiring external Schottky diode placement for reliable high-duty-cycle operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 55 V - supports 12 V, 24 V, and 48 V industrial and automotive battery systems without pre-regulation. |
| Output Current | 1.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed power architectures. |
| Switching Frequency | Up to 2 MHz - enables compact magnetics and avoids AM radio band interference; set via external resistor on FREQ pin. |
| Feedback Reference | 0.800 V ±20 mV - precise reference enables accurate output regulation down to 0.8 V with standard resistor dividers. |
| Quiescent Current | 140 µA - allows battery-backed systems to maintain >1-year standby life with typical 10 µAh coin cells. |
| Thermal Shutdown | 150 °C with 20 °C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
| Enable Threshold | 1.55 V rising, 1.2 V falling - provides noise-immune logic-level control compatible with MCU GPIOs and discrete level shifters. |
Pinout & Package
MPQ4559DN-LF-Z is offered in two RoHS-compliant, exposed-pad packages: SOIC8E (8-pin, 4.9 mm × 6.0 mm) and QFN10 (3 mm × 3 mm, 0.75 mm height), both optimized for thermal performance via direct GND pad connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2 / Pin 1) | Switch Node | High dv/dt node connecting internal MOSFET drain to external Schottky rectifier; requires low-inductance layout and local decoupling. |
| EN (Pin 3 / Pin 2) | Enable Input | Positive-logic enable with 1.55 V threshold; internal 1 µA pull-up allows floating-enable configuration. |
| COMP (Pin 4 / Pin 3) | Error Amplifier Output | Connects to RC network for loop compensation; clamped between 0.9 V and 2.0 V during normal operation. |
| FB (Pin 5 / Pin 4) | Feedback Input | Senses resistive divider output; compares to 0.8 V reference to regulate VOUT with <±2.5% accuracy over temperature. |
| GND (Pins 6, Exposed Pad / Pin 5) | Power & Signal Ground | Primary return path for switch current and control circuitry; exposed pad must be soldered to solid GND plane for thermal and EMI integrity. |
| FREQ (Pin 7 / Pin 6) | Frequency Programming | Connect resistor to GND to set fSW from 0.8 MHz to 2 MHz; tolerance directly impacts regulation accuracy under line/load transients. |
| VIN (Pins 8,9 / Pin 7) | Input Supply | Supplies internal regulators, gate drivers, and control logic; requires local 4.7 µF ceramic capacitor placed within 2 mm. |
| BST (Pin 10 / Pin 8) | Bootstrap Supply | Drives high-side MOSFET gate; requires 0.1 µF ceramic capacitor between BST and SW to sustain gate drive above 5 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 Qualification | Validated for –40 °C to +125 °C junction operation in automotive power domains, including engine control and ADAS subsystems. |
| Internal 250 mΩ High-Side MOSFET | Eliminates external high-voltage switch, reducing BOM count and PCB area while maintaining >90% efficiency at 1 A load and 12 V input. |
| Programmable 2 MHz Switching | Enables use of sub-10 µH inductors and 22 µF ceramic output caps, cutting solution size by >40% vs. 500 kHz converters. |
| 12 µA Shutdown Current | Supports always-on vehicle modules (e.g., CAN wake-up receivers) with <1 µW system standby power consumption. |
| Ceramic Capacitor Stability | Compensated for zero-ESR ceramic outputs without requiring added series resistance, simplifying filtering and improving reliability. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Supplies 3.3 V or 5 V to microcontroller, CAN transceiver, and sensor interface in door module or lighting controller. IC Role / Device Role / Timing Role: Primary buck regulator converting 12 V battery rail to logic supply; handles cold-crank (4.5 V) and load-dump (60 V) transients via UVLO and OVP protection. Use Value: AEC-Q100 qualification ensures functional safety compliance; 2 MHz operation avoids interference with AM/FM radio bands in cabin electronics. | Use Scenario: Powers isolated digital I/O channels and analog front-ends in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Point-of-load converter stepping down 24 V or 48 V field bus to 5 V/3.3 V; withstands industrial surge (IEC 61000-4-5) due to 60 V absolute max VIN rating. Use Value: Wide input range eliminates need for separate 24 V and 48 V SKUs; exposed-pad package enables conduction cooling in sealed enclosures. |
| Battery-Powered Telematics Unit | Distributed Telecom Power |
Use Scenario: Powers GPS module, cellular modem, and flash memory in fleet-tracking hardware operating from 3.6 V Li-ion or 12 V lead-acid. IC Role / Device Role / Timing Role: Always-on buck regulator with ultra-low IQ; enters pulse-skipping mode during sleep cycles to extend battery runtime. Use Value: 140 µA quiescent current enables >18-month shelf life on single CR2032 cell; internal soft-start prevents brownout during modem transmit bursts. | Use Scenario: Generates intermediate 5 V rail from 48 V telecom battery backup in remote radio units and small-cell base stations. IC Role / Device Role / Timing Role: High-efficiency step-down stage preceding LDOs or point-of-load converters; operates continuously at elevated ambient temperatures. Use Value: Thermal shutdown with 20 °C hysteresis prevents thermal runaway in confined RF enclosures; QFN10 package fits dense RF board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4572DQ-AEC1 | Successor part with 2 A output, lower RDS(ON) (165 mΩ), improved light-load efficiency, and same 3×3 mm QFN10 footprint. | Designed for higher-current loads (e.g., multi-core MCUs); retains AEC-Q100 Grade 1 and 55 V max VIN. | Select when upgrading legacy designs or requiring >1.5 A capability without layout change. |
| LM5164QPWPRQ1 | TI part with 1 A output, 65 V max VIN, integrated boot diode, and different compensation architecture (type II vs. type III). | Targeted at harsher automotive environments (Grade 0); lacks frequency foldback but adds spread-spectrum option. | Choose for 65 V input margin or if TI's WEBENCH ecosystem is preferred for design validation. |
Compared with MPQ4559DN-LF-Z, MPQ4572DQ-AEC1 offers higher current and efficiency in identical packaging, while LM5164QPWPRQ1 extends input voltage range and integrates bootstrap diode-both require revalidation of loop stability and thermal layout.
Availability
MPQ4559DN-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 MPQ4559DN-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MPQ45xx product line delivers high-voltage, high-frequency buck converters for automotive and industrial applications, emphasizing AEC-Q100 qualification, wide input range, and minimal external component count.
FAQ
What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for MPQ4559DN-LF-Z?
This designation indicates MPS has released a functional successor (MPQ4572) with improved specs and long-term supply assurance. MPQ4559DN-LF-Z remains fully manufacturable and supported for existing designs, with no announced obsolescence date or reduced quality standards.
Can MPQ4559DN-LF-Z operate reliably at 55 V input continuously?
Yes-it is rated for continuous operation up to 55 V input per datasheet specifications. The absolute maximum VIN is 60 V, providing 5 V margin for transient spikes. For sustained 55 V operation, ensure thermal design maintains TJ ≤ 125 °C using the specified θJA = 50 °C/W.
Why does MPQ4559DN-LF-Z require an external Schottky diode?
As a non-synchronous buck converter, it lacks an integrated low-side switch. The external Schottky diode provides the freewheeling path during high-side MOSFET off-time. Its low forward voltage and fast recovery minimize conduction loss and EMI generation.
How is the 2 MHz switching frequency programmed on MPQ4559DN-LF-Z?
Connect a resistor (RFREQ) from the FREQ pin to GND. For 2 MHz, RFREQ = 95 kΩ (per datasheet equation: RFREQ(kΩ) = 100000/fSW(kHz)). Use 1% tolerance metal-film resistor placed near the IC for stable frequency setting.
Does MPQ4559DN-LF-Z support output voltages below 1 V?
No-the minimum regulated output is 0.8 V, set by the internal feedback reference voltage. Attempting to configure lower outputs (e.g., 0.6 V) results in loss of regulation because the FB pin cannot be driven below 0.766 V across temperature.
What is the purpose of the BST pin, and how should it be routed?
BST supplies gate drive voltage to the internal high-side MOSFET. Route a 0.1 µF X7R ceramic capacitor directly between BST and SW pins with minimal trace length (<2 mm). Avoid sharing this node with noisy signals or ground planes carrying high di/dt currents.
Is MPQ4559DN-LF-Z pin-compatible with MPQ4572DQ-AEC1?
Yes-both share identical QFN10 (3 mm × 3 mm) and SOIC8E footprints, pin assignments, and thermal pad layout. However, MPQ4572 includes updated internal protection thresholds and requires verification of compensation network values for optimal transient response.
MPQ4559DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MPQ4559DN-LF-Z FAQ
1.How can I place an order for MPQ4559DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4559DN-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 MPQ4559DN-LF-Z reliable?
The price and inventory of MPQ4559DN-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 MPQ4559DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ4559DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4559DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4559DN-LF-Z?
MPQ4559DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4559DN-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 MPQ4559DN-LF-Z?
For technical support, including MPQ4559DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4559DN-LF-Z requirements.
6.How does Aetrix verify that MPQ4559DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4559DN-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 MPQ4559DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ4559DN-LF-Z?
All MPQ4559DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4559DN-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 MPQ4559DN-LF-Z part is unused and in its original packaging.
Return procedure for MPQ4559DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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