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Monolithic Power Systems Inc. MP4561DQ-LF-P
- Part No.:
- MP4561DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP4561DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:195
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Product details
Overview
MP4561DQ-LF-P from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 300mΩ high-side 55V MOSFET, delivering up to 1.5A output current at 2MHz switching frequency, supporting 3.8V–55V input and 0.8V–52V adjustable output - used in automotive power rails and industrial distributed supplies.
For engineers reviewing the MP4561DQ-LF-P datasheet, MP4561DQ-LF-P pinout, MP4561DQ-LF-P application, or MP4561DQ-LF-P equivalent, key selection criteria include its 140μA quiescent current for battery operation, programmable 2MHz frequency via external resistor, ceramic-capacitor stability, thermal shutdown protection, and 10-pin 3×3mm QFN package with exposed pad.
Technical Context
The MP4561DQ-LF-P employs peak current-mode control with internal transconductance error amplifier (120µA/V) and COMP pin-based loop compensation, enabling fast transient response and stable regulation across wide load ranges. Its programmable oscillator uses an external resistor on FREQ pin to set switching frequency from ~500kHz to 2MHz.
It features pulse-skipping mode at light loads to reduce gate-driving and switching losses, frequency foldback during startup to prevent inductor current runaway, and dedicated bootstrap charging circuitry with UVLO (2.5V rising threshold) for reliable high-side driver operation - all implemented in a single-chip solution without external synchronous rectifier.
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 | 1.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | Up to 2MHz - enables use of small inductors (e.g., 4.7–10µH) and avoids AM radio band interference. |
| Quiescent Current | 140µA - allows >1-year standby in battery-powered devices with typical 100mAh coin cell. |
| Feedback Reference | 0.800V ±20mV - enables precise output regulation with standard resistor-divider networks. |
| Internal MOSFET RDS(on) | 300mΩ max - limits conduction loss to <450mW at 1.5A, reducing thermal stress in compact layouts. |
| Shutdown Current | 12µA - ensures minimal battery drain when disabled via EN pin. |
| Soft-Start Time | 1.6ms (with 10nF CSS) - prevents output overshoot and inrush current during power-up or fault recovery. |
Pinout & Package
MP4561DQ-LF-P is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed thermal pad (pin 6), optimized for high-power density PCB layouts and efficient heat dissipation into internal ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | Drain of internal high-side MOSFET; connects directly to inductor and Schottky rectifier cathode - requires low-inductance layout to minimize EMI. |
| 3 EN | Enable Input | Positive-logic enable with 1.55V rising threshold; floating state enables device via internal 1µA pull-up - supports system-level power sequencing. |
| 4 COMP | Compensation Node | Error amplifier output; external RC network sets loop bandwidth and phase margin - critical for stability with ceramic output capacitors. |
| 5 FB | Feedback Input | Senses output voltage via resistive divider; compares to 0.8V internal reference - determines regulated output voltage accuracy and load regulation. |
| 6 GND / Exposed Pad | Power & Signal Ground | Primary return path for switch current and control circuits; exposed pad must be soldered to solid GND plane for thermal and EMI performance. |
| 7 FREQ | Frequency Programming | Connects external resistor to GND to set switching frequency (e.g., 95kΩ → 1MHz); enables EMI optimization per application. |
| 8 SS | Soft-Start Control | Accepts external capacitor to control ramp rate of output voltage - prevents overshoot and reduces stress on downstream components. |
| 9 VIN | Main Power Input | Supplies internal regulator, gate drivers, and logic; requires local 10µF ceramic decoupling close to pin to suppress switching noise. |
| 10 BST | Bootstrap Supply | Charges internal floating driver via external capacitor between BST and SW; enables high-side MOSFET gate drive above VIN - mandates proper bootstrap diode placement at 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range (3.8–55V) | Eliminates need for pre-regulator in 12V/24V/48V automotive and industrial systems - simplifies BOM and improves system efficiency. |
| 2MHz Programmable Switching | Reduces required inductor size by >50% vs. 500kHz designs - enables compact solutions for space-constrained applications like ADAS modules. |
| Ceramic Capacitor Stability | Operates stably with zero-ESR MLCCs on input/output - avoids tantalum/electrolytic reliability concerns and extends lifetime in high-temp environments. |
| External Soft-Start | Enables controlled power-up timing across multiple rails - essential for FPGA, DSP, or multi-rail SoC sequencing without external supervisors. |
| Thermal Shutdown + Hysteresis | Shuts down at 150°C with 20°C hysteresis - protects against sustained overload or poor heatsinking while allowing safe auto-recovery. |
| 12µA Shutdown Supply Current | Supports ultra-low-power wake-on-event architectures - enables >5-year shelf life in IoT sensor nodes powered by primary lithium cells. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering MCU, CAN transceiver, and analog front-end in door module or seat controller with 12V battery input. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator supplying core logic and communication interfaces. Use Value: 55V absolute max input withstands load-dump transients (ISO 7637-2 Pulse 5a); 2MHz operation avoids AM-band EMI in cabin electronics. | Use Scenario: Generating isolated 5V rail for digital I/O expansion cards in modular PLC backplane. IC Role / Device Role / Timing Role: Non-isolated intermediate supply converting 24V field bus to logic-level voltage. Use Value: 1.5A output supports up to 8 digital inputs/outputs; 140µA quiescent current minimizes standby loss across hundreds of modules. |
| Distributed Telecom Power | Battery-Powered Test Equipment |
Use Scenario: Local 5V conversion for remote PHY or SFP+ management circuitry in 48V-powered base station equipment. IC Role / Device Role / Timing Role: Point-of-load regulator downstream of primary 48V-to-12V stage. Use Value: 3.8–55V input range accommodates telecom nominal 48V and brownout conditions; 2MHz switching eases filtering in dense RF boards. | Use Scenario: Portable oscilloscope or multimeter using single Li-ion cell (3.0–4.2V) or 9V alkaline battery. IC Role / Device Role / Timing Role: Step-up/step-down hybrid supply generating stable 3.3V for ADC and display driver. Use Value: 12µA shutdown current preserves battery charge during storage; pulse-skipping mode extends runtime under light 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 |
|---|---|---|---|
| MP4572DQ-LF-Z | Successor with improved 2.5A rating, lower 100mΩ RDS(on), and enhanced thermal performance; same 3×3mm QFN-10 footprint. | Supports higher current loads (e.g., dual-core MCU + Ethernet PHY) without derating; recommended for new designs per MPS documentation. | Select MP4572DQ-LF-Z for new designs requiring higher output current or better efficiency at full load. |
| LM5164QPWPRQ1 | TI automotive-grade 1A buck with 3–65V input, integrated boot diode, and spread-spectrum EMI reduction - different pinout and compensation scheme. | Qualified to AEC-Q100 Grade 1; includes built-in bootstrap diode eliminating external component - reduces BOM count but increases layout complexity. | Choose LM5164QPWPRQ1 only if AEC-Q100 qualification or integrated bootstrap diode are mandatory design requirements. |
Compared with MP4561DQ-LF-P, MP4572DQ-LF-Z offers higher current capability and lower conduction loss in the same footprint, while LM5164QPWPRQ1 trades raw output current for automotive qualification and integrated bootstrap functionality - making MP4561DQ-LF-P optimal for cost-sensitive, non-automotive 1.5A applications where legacy compatibility matters.
Availability
MP4561DQ-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, distributed telecom systems, and portable test equipment requiring stable component supply and long-term obsolescence support.
Supply support for MP4561DQ-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 over two decades of leadership in DC/DC conversion and motor control.
The MP4561 belongs to MPS's high-voltage buck converter product line, designed specifically for robust, compact power conversion in automotive, industrial, and telecom environments where wide input range and EMI resilience are critical.
FAQ
What is the maximum allowable input voltage for MP4561DQ-LF-P?
The absolute maximum input voltage is +60V, but the recommended operating range is 3.8V to 55V. Operation above 55V risks exceeding internal gate oxide ratings and may trigger UVLO shutdown. The 60V rating provides margin for transient spikes such as ISO 7637-2 Pulse 5a (load dump), but sustained operation above 55V is not guaranteed per datasheet specifications.
Can MP4561DQ-LF-P operate with 100% duty cycle?
No - MP4561DQ-LF-P cannot achieve 100% duty cycle due to minimum off-time limitation of 100ns and bootstrap capacitor recharge requirement. When VIN ≈ VOUT, the BST-SW voltage differential becomes insufficient to sustain high-side gate drive, causing dropout. Practical maximum duty cycle is ~95% at low VIN/VOUT ratios, constrained by bootstrap timing and internal driver UVLO.
Why does MP4561DQ-LF-P require an external Schottky diode?
As a non-synchronous buck converter, MP4561DQ-LF-P lacks an integrated low-side MOSFET and relies on an external Schottky diode to provide current path during high-side switch off-time. The diode must have reverse voltage rating >VIN(max) and forward current rating >IOUT(max), with low VF to minimize conduction loss - e.g., B380-13-F (80V/3A) per MPS application guidance.
Is MP4561DQ-LF-P pin-compatible with MP4572DQ-LF-Z?
Yes - MP4561DQ-LF-P and MP4572DQ-LF-Z share identical 3×3mm QFN-10 package, pin assignment, and footprint. However, MP4572 includes internal enhancements including lower RDS(on), higher current limit, and updated thermal characteristics; electrical behavior is functionally compatible but not electrically identical across all operating conditions.
How does frequency foldback improve startup reliability?
During startup, frequency foldback reduces switching frequency when inductor current approaches limit, preventing current runaway before output capacitor is fully charged. This avoids magnetic saturation, excessive MOSFET stress, and potential thermal shutdown - especially critical with large output capacitance or high input voltage, where peak currents would otherwise exceed 3.1A limit.
What is the role of the exposed thermal pad (Pin 6)?
The exposed pad is electrically connected to internal GND and serves as primary thermal conduction path. It must be soldered to a dedicated PCB copper pour tied to system GND - not left floating or connected only through vias. Per MPS layout guidelines, ≥4 thermal vias (0.3mm diameter) under the pad are required to achieve θJA = 50°C/W and maintain junction temperature ≤125°C at 1.5A full load.
Does MP4561DQ-LF-P support forced PWM mode?
No - MP4561DQ-LF-P operates exclusively in peak current-mode control with automatic transition between fixed-frequency PWM and pulse-skipping modes based on load. There is no external pin or register to force continuous conduction mode; light-load efficiency is prioritized over ripple consistency, making it unsuitable for noise-sensitive analog circuits requiring constant switching frequency.
MP4561DQ-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)
MP4561DQ-LF-P FAQ
1.How can I place an order for MP4561DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4561DQ-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 MP4561DQ-LF-P reliable?
The price and inventory of MP4561DQ-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 MP4561DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP4561DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4561DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4561DQ-LF-P?
MP4561DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4561DQ-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 MP4561DQ-LF-P?
For technical support, including MP4561DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4561DQ-LF-P requirements.
6.How does Aetrix verify that MP4561DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP4561DQ-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 MP4561DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP4561DQ-LF-P?
All MP4561DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4561DQ-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 MP4561DQ-LF-P part is unused and in its original packaging.
Return procedure for MP4561DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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