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Monolithic Power Systems Inc. MP4561DQ-LF-Z
- Part No.:
- MP4561DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP4561DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,123
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Product details
Overview
MP4561DQ-LF-Z from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 300mΩ high-side 55V MOSFET, 2MHz programmable switching frequency, 3.8–55V input range, and 1.5A output current. It delivers up to 95% efficiency with frequency foldback at light load and supports automotive-grade operation from –40°C to +125°C junction temperature.
For engineers reviewing the MP4561DQ-LF-Z datasheet, MP4561DQ-LF-Z pinout, MP4561DQ-LF-Z application, or MP4561DQ-LF-Z equivalent, key selection criteria include its 100ns minimum on-time, 140μA quiescent current, external soft-start control via SS pin, and bootstrap capacitor charging requirements for stable 2MHz operation.
Technical Context
The MP4561DQ-LF-Z employs peak current-mode control with an internal transconductance error amplifier (120µA/V) and precision 0.8V feedback reference (±2.5% over temperature). Its PWM cycle initiates from a programmable oscillator (set by FREQ pin resistor), with blanking during switch turn-on to suppress noise.
It integrates a floating high-side gate driver powered by a dedicated bootstrap regulator (regulated ~4V between BST and SW), featuring UVLO (2.5V rising threshold, 300mV hysteresis) and automatic soft-start reset if bootstrap voltage collapses. Thermal shutdown activates at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports direct connection to automotive battery (cold-crank down to 3.8V) and industrial 48V rails. |
| Output Current | 1.5A continuous - limited by internal MOSFET RDS(ON) (300mΩ typ) and thermal design in 3×3mm QFN package. |
| Switching Frequency | Up to 2MHz (programmable via FREQ pin resistor) - enables compact magnetics and avoids AM/ADSL EMI bands. |
| Feedback Reference | 0.800V ±2.5% - sets output voltage accuracy via external resistor divider; stable across –40°C to +125°C. |
| Quiescent Current | 140μA - enables >1-year battery life in always-on systems with VIN ≥3.8V and light-load operation. |
| Shutdown Current | 12–20μA - achieved when EN < 0.3V; critical for ultra-low-power wake-up architectures. |
| Min On/Off Time | 100ns / 100ns - constrains practical duty-cycle range at 2MHz (e.g., VOUT/VIN ≥ 0.02 for 55V→1.2V conversion). |
Pinout & Package
The MP4561DQ-LF-Z is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed thermal pad (pin 6), optimized for PCB heat spreading and low θJA (50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | High-current output of internal MOSFET; requires low-VF Schottky diode to GND and tight layout to minimize ringing. |
| 3 EN | Enable control | Positive-logic input (1.55V rising threshold); internal 1µA pull-up allows floating-enable; drives shutdown below 1.2V. |
| 4 COMP | Error amplifier output | Current-source node for loop compensation; clamped between 0.9V–2.0V; connects to RC network for stability tuning. |
| 5 FB | Voltage feedback input | Senses resistive divider output; compared to 0.8V internal reference to regulate VOUT. |
| 6 GND / Exposed Pad | Power and signal ground | Primary thermal path; must be soldered to large PCB copper area and connected near output capacitor to reduce noise coupling. |
| 7 FREQ | Frequency programming | Resistor-to-GND sets fSW; e.g., 95kΩ yields 1MHz; supports 0.8–1.2MHz (typ) or up to 2MHz with derating. |
| 8 SS | Soft-start timing | Capacitor-to-GND sets ramp time (e.g., 10nF → 1.6ms); controls VOUT slew rate during startup and short-circuit recovery. |
| 9 VIN | Main power input | Supplies all internal circuitry and high-side driver; requires local 10µF ceramic decoupling adjacent to pin. |
| 10 BST | Bootstrap supply | Connects to SW via 0.1µF ceramic capacitor; supplies floating gate driver; external diode recommended at 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3.8–55V) | Eliminates need for pre-regulator in automotive and industrial 24/48V systems; tolerates cold-crank and load-dump transients. |
| 2MHz programmable switching | Enables use of sub-10µH inductors and 0805/1206 ceramics, reducing solution size by >40% vs. 500kHz designs. |
| 140μA quiescent current | Supports >10-year shelf life in battery-backed IoT sensors and telematics modules with periodic wake-up. |
| External soft-start (SS pin) | Prevents output overshoot and inrush current during hot-plug events or brown-out recovery without requiring external timers. |
| Ceramic-capacitor stable | Operates with zero-ESR MLCCs across full load range; removes need for tantalum/electrolytic bulk capacitors and associated reliability risks. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/1.8V logic rails in head-unit mainboard under 9–16V battery input with load-dump immunity. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering regulated 3.3V @ 1.2A to MCU, CAN transceivers, and display interface ICs. Use Value: 55V absolute max rating withstands ISO 7637-2 Pulse 5a (60V/100ms); 2MHz operation avoids AM radio band interference in cabin audio systems. | Use Scenario: Generating 5V/1.5A for digital I/O isolation and fieldbus communication in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Central point-of-load converter accepting wide-range 24VDC industrial supply (18–32V) and delivering clean 5V to optocouplers and RS-485 PHYs. Use Value: 3.8V min input ensures regulation during brown-outs; 140μA IQ extends backup battery runtime during AC mains failure. |
| Telecom Remote Radio Unit | Medical Portable Monitor |
Use Scenario: Converting 48V PoE++ or -48V telecom supply to 12V intermediate rail for RF amplifiers and ADCs. IC Role / Device Role / Timing Role: High-input-voltage buck stage stepping 48V down to 12V @ 1.5A before secondary LDOs generate analog/digital supplies. Use Value: 55V rating accommodates -48V system transients (+10% tolerance); 2MHz switching minimizes conducted EMI into sensitive RF front-end. | Use Scenario: Battery-powered ECG/SpO₂ monitor requiring long operational life from two AA cells (1.8–3.2V) boosted to 5V, then bucked to 3.3V. IC Role / Device Role / Timing Role: Secondary buck regulator accepting 5V from boost stage and delivering ultra-low-noise 3.3V @ 500mA to mixed-signal SoC and sensor front-end. Use Value: 12μA shutdown current preserves battery charge during sleep; ceramic-stable loop ensures clean power for 24-bit ADCs without added filtering. |
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 |
|---|---|---|---|
| MP4572DQ-LF-Z | Successor device: same 3×3mm QFN, 55V rating, but synchronous rectification (no external diode), 2A output, 12μA IQ, and improved light-load efficiency. | Eliminates Schottky diode BOM cost and board space; required for new designs per MPS notice. | Select MP4572 for higher efficiency, lower thermal stress, and simplified layout where 2A output suffices. |
| LM5164QPWPRQ1 | TI automotive-grade 1A buck: 3–65V input, 1MHz fixed freq, integrated high/low-side FETs, AEC-Q100 qualified. | Meets automotive qualification requirements; lacks programmable frequency and external soft-start flexibility. | Choose LM5164Q1 only when AEC-Q100 compliance is mandatory and 1A output meets system needs. |
Compared with MP4561DQ-LF-Z, MP4572DQ-LF-Z delivers 33% higher current and eliminates external diode losses, while LM5164QPWPRQ1 adds automotive qualification at the cost of reduced feature set and lower output capability.
Availability
MP4561DQ-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment power, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply through legacy design support cycles.
Supply support for MP4561DQ-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, LED drivers, and motor control.
The MP4561 belongs to MPS's high-voltage non-synchronous buck converter product line, designed for cost-sensitive, space-constrained applications where external diode overhead is acceptable and 55V input tolerance is essential.
FAQ
Is MP4561DQ-LF-Z still recommended for new designs?
No. Monolithic Power Systems explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MP4572" in the datasheet revision 1.01. MP4572 is the pin-compatible, functionally enhanced successor with synchronous rectification, lower quiescent current (12μA), and 2A output capability.
What is the purpose of the BST pin and why is an external diode recommended at 2MHz?
The BST pin supplies the floating gate driver for the internal high-side MOSFET via a capacitor tied to SW. At 2MHz, the short off-time reduces bootstrap capacitor recharge window; an external Schottky diode (e.g., CMSH2-100M) ensures reliable BST voltage maintenance and prevents driver UVLO-induced dropout.
Can MP4561DQ-LF-Z operate with ceramic output capacitors only?
Yes. Its current-mode control and compensation architecture are explicitly characterized for ceramic-capacitor-only output stages. The datasheet confirms stability with zero-ESR MLCCs and provides C2/R3/C3 design equations for common VOUT/C2 combinations without requiring bulk electrolytics.
How does frequency foldback improve light-load efficiency?
Below ~20% load, MP4561DQ-LF-Z reduces switching frequency to minimize gate-drive and switching losses. This pulse-skipping mode lowers total power dissipation versus fixed-frequency operation, achieving >85% efficiency at 10mA load-critical for battery longevity.
What thermal considerations apply to the exposed pad (pin 6)?
The exposed pad is electrically GND and the primary thermal path. It must be soldered to a ≥100mm² internal or bottom-layer copper pour with ≥4 thermal vias (0.3mm diameter) to inner/ground planes. Failure to do so raises θJA beyond 50°C/W, risking thermal shutdown above 1A load at +85°C ambient.
Does MP4561DQ-LF-Z support output voltages below 0.8V?
No. The internal 0.8V feedback reference is fixed and untrimmed. Output voltage is calculated as VOUT = 0.8V × (1 + R1/R2), with minimum practical VOUT constrained by resistor tolerance and noise sensitivity-typically not recommended below 0.85V.
What is the maximum achievable output voltage with MP4561DQ-LF-Z?
The datasheet specifies VOUT up to 52V, limited by the 60V absolute maximum SW pin rating minus safety margin. Achieving 52V requires careful layout to minimize SW node ringing and selection of ≥60V-rated external diode and output capacitor.
MP4561DQ-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP4561DQ-LF-Z FAQ
1.How can I place an order for MP4561DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4561DQ-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 MP4561DQ-LF-Z reliable?
The price and inventory of MP4561DQ-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 MP4561DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP4561DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4561DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4561DQ-LF-Z?
MP4561DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4561DQ-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 MP4561DQ-LF-Z?
For technical support, including MP4561DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4561DQ-LF-Z requirements.
6.How does Aetrix verify that MP4561DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP4561DQ-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 MP4561DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP4561DQ-LF-Z?
All MP4561DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4561DQ-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 MP4561DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP4561DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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