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Monolithic Power Systems Inc. MPQ4559DQ-LF-P
- Part No.:
- MPQ4559DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MPQ4559DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,121
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Product details
Overview
MPQ4559DQ-LF-P from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 250mΩ high-side 55V MOSFET, delivering up to 1.5A output current at 2MHz switching frequency across a 3.8V–55V input range. It features AEC-Q100 qualification, 140μA quiescent current, and internal soft-start-designed for automotive power rails, industrial HVDC supplies, and battery-powered systems requiring compact, high-voltage regulation.
For engineers reviewing the MPQ4559DQ-LF-P datasheet, MPQ4559DQ-LF-P pinout, MPQ4559DQ-LF-P application, or MPQ4559DQ-LF-P equivalent, key selection criteria include its programmable 2MHz oscillator (via FREQ pin), thermal shutdown behavior, bootstrap capacitor charging constraints, and compatibility with ceramic-output-capacitor stability.
Technical Context
The MPQ4559DQ-LF-P implements peak-current-mode control with a 0.8V ±2% feedback reference and GM error amplifier (120µA/V transconductance, 400V/V gain). Its internal 2.6V regulator powers all circuitry across the full VIN range, enabling operation down to 3.8V while maintaining stable biasing.
Switching is governed by a resistor-programmable oscillator (RFREQ to GND), supporting 0.7–1.3MHz typical range; minimum on/off times are fixed at 100ns each. Frequency foldback during startup and short-circuit conditions prevents inductor current runaway, while pulse-skipping mode reduces light-load losses without external control.
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 | 1.5A continuous - limited by internal MOSFET RDS(ON) (250mΩ typ) and thermal design of QFN10 package. |
| Switching Frequency | Programmable up to 2MHz - enables use of small 4.7–10µH inductors and avoids AM radio band EMI. |
| Feedback Reference | 0.800V ±2% - sets output voltage via external resistor divider; tolerance directly impacts VOUT accuracy. |
| Quiescent Current | 140µA - enables >1-year standby in 10mAh Li-ion battery applications with 3.3V output. |
| Shutdown Current | 12µA - ensures minimal drain when EN pin is pulled low in battery-critical systems. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during overload or poor PCB thermal layout; resumes operation at 130°C. |
Pinout & Package
MPQ4559DQ-LF-P is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed pad (pin 5), optimized for high-power density and efficient heat transfer to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (SW) | Switch Node | Drains high-side MOSFET; requires low-VF Schottky diode to GND and tight layout to minimize ringing. |
| 3 (EN) | Enable Input | Positive logic control: ≥1.55V enables; ≤1.4V disables; internal 1µA pull-up allows floating-enable operation. |
| 4 (COMP) | Error Amplifier Output | Drives external RC compensation network; clamped between 0.9V and 2.0V; defines loop stability and transient response. |
| 5 (FB) | Feedback Input | Senses resistive divider output; compares to 0.8V reference to regulate VOUT; leakage <1.0µA minimizes divider error. |
| 6 (GND) | Power & Signal Ground | Common return for IC core, SW path, and exposed pad; must connect directly to solid GND plane for thermal and noise performance. |
| 7 (FREQ) | Frequency Programming | Connects external resistor to GND to set fSW; 95kΩ yields ~1MHz; supports 0.7–1.3MHz typical range. |
| 8, 9 (VIN) | Input Supply | Powers internal regulators and high-side driver; requires local 4.7µF ceramic decoupling close to pins. |
| 10 (BST) | Bootstrap Supply | Charged via external capacitor to SW; regulates ~5V to drive high-side gate; insufficient charge causes cycle skipping or dropout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Validated for automotive temperature range (–40°C to +125°C junction) and stress testing per Grade 1 requirements. |
| Ceramic Capacitor Stable | Compensated for low-ESR ceramic output caps (e.g., 22µF X5R); eliminates need for tantalum/electrolytic bulk capacitance. |
| Internal Soft-Start | 0.19–0.5ms ramp time prevents output overshoot during power-up and short-circuit recovery. |
| Frequency Foldback | Reduces fSW under overload/short-circuit to limit peak inductor current and prevent thermal runaway. |
| Bootstrap UVLO Protection | 2.2V BST-SW UVLO with 150mV hysteresis resets soft-start if bootstrap voltage collapses, ensuring safe restart. |
Applications
| Automotive Infotainment Power Rail | Industrial 48V DC-DC Conversion |
|---|---|
Use Scenario: Supplies 3.3V/1.5A to MCU, display controller, and CAN transceiver in head unit with 9–16V battery input and load dump transients. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator; handles wide VIN variation and thermal cycling in dash-mounted enclosures. Use Value: AEC-Q100 qualification ensures reliability over 15-year vehicle life; 2MHz operation avoids interference with AM/FM receivers. | Use Scenario: Steps down 48V telecom or factory automation bus to 5V for PLC I/O modules operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-input-voltage point-of-load regulator; replaces discrete MOSFET+controller solutions with single-chip integration. Use Value: 55V absolute max rating provides 7V margin above 48V nominal; QFN10 package enables compact 12mm² board area. |
| Battery-Powered Telematics Unit | Distributed Power Architecture |
Use Scenario: Powers GPS module, cellular modem, and sensor hub from 3S Li-ion (9–12.6V) with multi-day sleep mode requirements. IC Role / Device Role / Timing Role: Always-on buck converter with ultra-low IQ; manages wake/sleep transitions via EN pin control. Use Value: 140µA quiescent current extends battery life; shutdown current of 12µA eliminates parasitic drain during deep sleep. | Use Scenario: Provides isolated 12V auxiliary rail from main 24V/36V distribution bus in robotics control cabinets with space-constrained layouts. IC Role / Device Role / Timing Role: Secondary regulated supply for motor drivers, encoders, and safety logic; operates alongside primary AC/DC converter. Use Value: Wide 3.8–55V input accommodates bus sag and surge; internal soft-start prevents inrush into downstream capacitive loads. |
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 | Successor device: 2A output, 3.8–60V input, 2.2MHz max fSW, lower RDS(ON) (160mΩ), same QFN10 package. | Supports higher load currents and wider input range; retains AEC-Q100 Grade 1 qualification and pinout compatibility. | Select for new designs requiring higher current headroom or extended input voltage margin beyond 55V. |
| LM5164QPWPRQ1 | Texas Instruments part: 1A, 3.5–65V, 1MHz max fSW, synchronous rectification, different pinout and compensation scheme. | Higher efficiency at light loads due to synchronous FET; lacks integrated bootstrap diode drive; requires external high-side gate driver. | Choose where >90% efficiency at 10mA load is critical, and board space allows redesign for non-pin-compatible layout. |
Compared with MPQ4559DQ-LF-P, MPQ4572DQ-AEC1 offers higher current capability and extended input range in identical footprint, while LM5164QPWPRQ1 trades integration for synchronous efficiency-making MPQ4559DQ-LF-P optimal for cost-sensitive, space-constrained 1.5A automotive/industrial buck needs where legacy design reuse is prioritized.
Availability
MPQ4559DQ-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 48V power conversion, and battery-powered telematics requiring stable component supply despite its "Not Recommended for New Designs" status.
Supply support for MPQ4559DQ-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.
The MPQ45xx series targets high-voltage DC/DC conversion in automotive and industrial environments, emphasizing AEC-Q100 compliance, wide input range, and compact packaging for harsh-temperature deployment.
FAQ
What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for MPQ4559DQ-LF-P?
This designation indicates MPS has released a functional successor (MPQ4572) with improved specs and long-term supply assurance. MPQ4559DQ-LF-P remains fully qualified and supported for existing designs, with no announced obsolescence date or reduced manufacturing priority.
Can MPQ4559DQ-LF-P operate reliably at 55V input continuously?
Yes-it is rated for continuous operation up to 55V input, with absolute maximum VIN of 60V. Thermal design must ensure junction temperature stays ≤125°C under worst-case load and ambient conditions, especially given its 250mΩ RDS(ON) and QFN10 thermal resistance (θJA = 50°C/W).
Why does the BST pin require an external capacitor, and what value is recommended?
The BST capacitor (typically 0.1µF ceramic) forms a flying charge pump to generate ~5V gate drive for the internal high-side MOSFET. It must be placed directly between BST and SW pins with minimal trace length to sustain gate voltage during high-duty-cycle operation and avoid bootstrap undervoltage shutdown.
Is MPQ4559DQ-LF-P compatible with ceramic output capacitors only, or can tantalum be used?
It is optimized for ceramic output capacitors (e.g., 22µF X5R) and remains stable with their near-zero ESR. Tantalum or electrolytic capacitors may be used but require additional ESR-based compensation (C5 resistor-capacitor network) to maintain phase margin due to their higher ESR-induced zero.
How does the FREQ pin resistor affect switching frequency accuracy and temperature drift?
The RFREQ resistor sets nominal fSW via a current-source-based oscillator; typical accuracy is ±20% over temperature and process. For precise timing, select 1% tolerance metal-film resistors and verify actual fSW at operating temperature using oscilloscope measurement at SW pin.
Does MPQ4559DQ-LF-P support forced PWM mode, or is it strictly pulse-skipping at light loads?
It operates exclusively in pulse-skipping mode under light loads to maximize efficiency; there is no forced PWM or external mode-select pin. This behavior is inherent to its current-mode architecture and cannot be disabled-designers must account for variable-frequency operation in EMI filtering.
What is the minimum output voltage achievable with MPQ4559DQ-LF-P, and how is it set?
The minimum regulated output is 0.8V, set by the internal feedback reference. To achieve this, connect FB directly to the output (R2 = 0Ω, R1 omitted); for higher voltages, use a resistor divider where VOUT = 0.8V × (1 + R1/R2), with R2 typically 10kΩ for optimal noise immunity.
MPQ4559DQ-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:
- 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)
MPQ4559DQ-LF-P FAQ
1.How can I place an order for MPQ4559DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4559DQ-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 MPQ4559DQ-LF-P reliable?
The price and inventory of MPQ4559DQ-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 MPQ4559DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MPQ4559DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4559DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4559DQ-LF-P?
MPQ4559DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4559DQ-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 MPQ4559DQ-LF-P?
For technical support, including MPQ4559DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4559DQ-LF-P requirements.
6.How does Aetrix verify that MPQ4559DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MPQ4559DQ-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 MPQ4559DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MPQ4559DQ-LF-P?
All MPQ4559DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4559DQ-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 MPQ4559DQ-LF-P part is unused and in its original packaging.
Return procedure for MPQ4559DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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