My Inquiry
My Account
Monolithic Power Systems Inc. MP4559DQ-LF-P
- Part No.:
- MP4559DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP4559DQ-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,513
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP4559DQ-LF-P from Monolithic Power Systems is a non-synchronous 55V step-down DC/DC converter with integrated 250mΩ high-side MOSFET, 2MHz programmable switching frequency, and 1.5A output current capability. It operates from 3.8V to 55V input, delivers adjustable output from 0.8V to 52V, and features 140μA quiescent current-enabling use in automotive power rails and battery-powered industrial sensors.
For engineers reviewing the MP4559DQ-LF-P datasheet, MP4559DQ-LF-P pinout, MP4559DQ-LF-P application, or MP4559DQ-LF-P equivalent, key selection criteria include its 2MHz operation for EMI-sensitive AM radio/ADSL systems, internal soft-start for inrush control, ceramic-capacitor stability, and QFN10 (3mm × 3mm) thermal performance with exposed pad.
Technical Context
The MP4559DQ-LF-P implements peak-current-mode control with an internal transconductance error amplifier (120µA/V), enabling fast transient response and simplified loop compensation via the COMP pin. Its programmable oscillator uses an external resistor on the FREQ pin to set switching frequency from 0.7MHz to 1.3MHz (typ), with 2MHz achievable under optimized layout.
It integrates a bootstrap driver with 5V regulated BST supply, UVLO thresholds at 3.0V (rising) and 2.6V (falling), and thermal shutdown at 150°C with 20°C hysteresis. Pulse-skipping mode reduces light-load switching losses, while frequency foldback prevents inductor current runaway during startup.
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 ~4V) and industrial 48V rails. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, CAN transceivers, and analog front-ends in distributed systems. |
| Switching Frequency | Up to 2MHz - enables compact magnetics and avoids AM band (0.53–1.71MHz) and ADSL interference zones. |
| Quiescent Current | 140μA - allows >1-year battery life in always-on sensor nodes with 200mAh Li coin cell. |
| Feedback Reference | 0.800V ±2% - enables precise output regulation with standard resistor dividers; sets VOUT = 0.8 × (1 + R1/R2). |
| Internal MOSFET RDS(on) | 250mΩ (typ) - limits conduction loss at 1.5A to <560mW, supporting thermally constrained QFN10 package. |
| Shutdown Current | 12μA - ensures minimal drain during system sleep modes without external enable circuitry. |
Pinout & Package
MP4559DQ-LF-P is housed in a 3mm × 3mm, 10-pin QFN package with exposed thermal pad. The package supports 2.5W continuous power dissipation at TA = +25°C (θJA = 50°C/W) and requires soldering the exposed pad directly to PCB ground plane for optimal thermal performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (SW) | Switch Node | High dv/dt node connecting internal MOSFET drain to external Schottky diode cathode; must be routed short and away from sensitive analog traces. |
| 3 (EN) | Enable Input | Positive-logic control with 1.55V rising threshold; floating enables device via internal 1µA pull-up; 12µA shutdown current achieved when pulled <1.2V. |
| 4 (COMP) | Error Amplifier Output | Provides gm-amplifier output for external RC compensation network; clamped between 0.9V and 2.0V; determines loop stability and transient response. |
| 5 (FB) | Voltage Feedback Input | Senses resistive divider output; compares to 0.8V internal reference to regulate VOUT; leakage <1.0μA minimizes divider error. |
| 6 (GND) | Power & Signal Ground | Primary return path for switch current and control circuitry; exposed pad must be solidly connected to PCB ground plane for thermal and EMI control. |
| 7 (FREQ) | Frequency Programming | Connects external resistor to GND to set fSW; 95kΩ yields 1MHz; supports design flexibility across EMI and efficiency trade-offs. |
| 8, 9 (VIN) | Input Supply | Supplies internal regulator, gate drivers, and logic; requires local 4.7µF ceramic decoupling placed within 2mm of pins to suppress switching noise. |
| 10 (BST) | Bootstrap Supply | Charged to ~5V relative to SW via internal regulator; powers high-side gate driver; requires 0.1µF ceramic capacitor between BST and SW. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic Capacitor Stability | Operates stably with low-ESR ceramic output capacitors-eliminates need for tantalum/electrolytic, reducing board area and aging risk. |
| Internal Soft-Start | 0.5ms controlled VOUT ramp prevents overshoot and inrush stress on downstream loads like ADC references or RF ICs. |
| Frequency Foldback | Reduces switching frequency during startup and short-circuit events to limit peak inductor current and prevent saturation. |
| Thermal Shutdown Protection | 150°C junction trip with 20°C hysteresis ensures fault-tolerant operation in sealed enclosures or high-ambient industrial environments. |
| Bootstrap UVLO | 2.2V BST-SW UVLO with 150mV hysteresis resets soft-start if bootstrap voltage collapses-prevents erratic switching due to insufficient gate drive. |
Applications
| Automotive Body Control Module | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering MCU, LIN transceiver, and temperature/humidity sensor from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary 3.3V/1.5A buck regulator; provides clean, regulated supply independent of battery voltage sag. Use Value: 3.8V–55V input range survives 4V cold-crank dips; 140μA IQ extends battery backup runtime; 2MHz operation avoids interference with vehicle AM radio. | Use Scenario: Self-powered wireless vibration sensor using Li-SOCl₂ primary cell in predictive maintenance gateway. IC Role / Device Role / Timing Role: Always-on step-down converter delivering 3.3V to ultra-low-power MCU and BLE radio during periodic wake-ups. Use Value: 12μA shutdown current enables >5-year shelf life; ceramic-stable design eliminates capacitor replacement; QFN10 footprint fits compact enclosure. |
| Distributed Telecom Power | Factory Automation I/O Module |
Use Scenario: Local 5V rail generation from 48V backplane in remote radio head or optical line terminal. IC Role / Device Role / Timing Role: Point-of-load converter supplying FPGA I/O banks and serializer/deserializer ICs. Use Value: 55V absolute max VIN withstands 48V surge transients; 250mΩ RDS(on) limits thermal rise in confined airflow; 2MHz allows small 4.7µH inductor. | Use Scenario: Powering isolated digital input circuits, optocouplers, and status LEDs from 24V industrial bus. IC Role / Device Role / Timing Role: Non-isolated 5V/1.5A supply for logic-level interface circuitry in DIN-rail mounted PLC modules. Use Value: Wide 3.8V–55V input accommodates brownouts and surges per IEC 61000-4-5; SOIC8E alternative available for through-hole reworkability. |
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 2.5A output, lower 100mΩ RDS(on), improved light-load efficiency, and same pinout. | Supports higher current loads (e.g., dual-core MCUs); better thermal margin in sealed enclosures. | Select MP4572DQ-LF-Z for new designs requiring higher reliability, longer product lifecycle, or increased output capability. |
| LM5164QDGQRQ1 | Automotive-grade 1.5A buck with 65V max VIN, spread-spectrum EMI reduction, and AEC-Q100 Grade 1 qualification. | Required for ASIL-B functional safety systems; includes enhanced diagnostics and fault reporting. | Choose LM5164QDGQRQ1 only where automotive qualification, spread-spectrum operation, or diagnostic coverage is mandatory. |
Compared with MP4559DQ-LF-P, MP4572DQ-LF-Z offers higher current and efficiency in identical packaging, while LM5164QDGQRQ1 adds automotive qualification and EMI mitigation at the cost of higher BOM complexity and price-making MP4559DQ-LF-P suitable for cost-sensitive industrial legacy designs where obsolescence risk is managed.
Availability
MP4559DQ-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, distributed telecom power, and factory automation I/O modules requiring stable component supply amid ongoing transition to MP4572.
Supply support for MP4559DQ-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, and global manufacturing partnerships.
The MP45xx series targets high-voltage industrial and automotive DC/DC conversion, emphasizing wide input range, compact solution size, and robust protection-designed specifically for environments with unstable input rails and space-constrained PCBs.
FAQ
What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for MP4559DQ-LF-P?
This designation indicates MPS has released a direct pin-compatible successor-the MP4572-with improved specifications (2.5A output, lower RDS(on), enhanced efficiency). MP4559DQ-LF-P remains fully functional and supported for existing designs, but new projects should evaluate MP4572DQ-LF-Z for longer-term supply assurance and performance gains.
Can MP4559DQ-LF-P operate reliably at 2MHz switching frequency?
Yes-its datasheet specifies up to 2MHz operation, but achieving stable 2MHz requires careful layout: an external bootstrap diode is strongly recommended to ensure adequate BST capacitor recharge, and minimum on-time (100ns) must be respected in high-duty-cycle applications to avoid pulse skipping instability.
Why does MP4559DQ-LF-P use a non-synchronous rectifier instead of synchronous MOSFET control?
The non-synchronous architecture simplifies design by eliminating timing-critical high-side gate drive and shoot-through protection. With its 250mΩ internal MOSFET and optimized for 1.5A loads, efficiency remains competitive vs. synchronous solutions-especially when paired with low-VF Schottky diodes like B380-13-F, avoiding complexity in cost-sensitive industrial applications.
How is thermal performance affected by the QFN10 exposed pad connection?
Thermal resistance θJA drops from ~50°C/W (no pad connection) to ≤35°C/W with full solder coverage of the exposed pad to a 2-layer 1-in² copper pour. Inadequate pad connection causes junction temperature to exceed 125°C at 1.2A load in +70°C ambient-requiring strict adherence to MPS's layout guidelines for GND pad vias and thermal relief.
Is MP4559DQ-LF-P RoHS compliant and lead-free?
Yes-MP4559DQ-LF-P carries the "-LF" suffix confirming full compliance with RoHS Directive 2011/65/EU and MPS green policy. All package finishes are matte tin, and the device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE, verified per JEDEC J-STD-020 moisture sensitivity level 3.
What is the minimum output voltage achievable with MP4559DQ-LF-P?
The feedback reference is precisely trimmed to 0.800V ±2%, allowing stable regulation down to 0.8V. To achieve this, use a 10kΩ R2 and calculate R1 = R2 × ((VOUT / 0.8) − 1); for 0.8V output, R1 = 0Ω (i.e., connect FB directly to output), confirmed in typical application schematics on page 1 of the datasheet.
MP4559DQ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- 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)
MP4559DQ-LF-P FAQ
1.How can I place an order for MP4559DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4559DQ-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 MP4559DQ-LF-P reliable?
The price and inventory of MP4559DQ-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 MP4559DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP4559DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4559DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4559DQ-LF-P?
MP4559DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4559DQ-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 MP4559DQ-LF-P?
For technical support, including MP4559DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4559DQ-LF-P requirements.
6.How does Aetrix verify that MP4559DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP4559DQ-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 MP4559DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP4559DQ-LF-P?
All MP4559DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4559DQ-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 MP4559DQ-LF-P part is unused and in its original packaging.
Return procedure for MP4559DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP4559DQ-LF-P Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
