My Inquiry
My Account
Monolithic Power Systems Inc. MPQ4559DN-LF-P
- Part No.:
- MPQ4559DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MPQ4559DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPQ4559DN-LF-P from Monolithic Power Systems is an AEC-Q100-qualified, non-synchronous step-down DC/DC converter with integrated 250mΩ high-side MOSFET, delivering 1.5A output current across a 3.8V–55V input range and adjustable 0.8V–52V output. It operates at up to 2MHz switching frequency, features 140μA quiescent current, and supports automotive and industrial power conversion where wide VIN and EMI-sensitive environments (e.g., AM radio bands) demand high-frequency operation.
For engineers reviewing the MPQ4559DN-LF-P datasheet, MPQ4559DN-LF-P pinout, MPQ4559DN-LF-P application, or MPQ4559DN-LF-P equivalent, key selection criteria include its programmable 2MHz oscillator, internal soft-start, thermal shutdown, frequency foldback during startup, and compatibility with ceramic output capacitors - all critical for battery-powered, high-voltage, and automotive-grade designs.
Technical Context
The MPQ4559DN-LF-P implements peak-current-mode control with a 0.8V ±2% feedback reference and 5.7A/V transconductance error amplifier, enabling fast transient response and stable loop compensation via the COMP pin. Its internal 2.6V regulator powers control circuitry across the full 3.8V–55V input range, while bootstrap charging relies on external BST–SW capacitance and requires sufficient VIN–VOUT headroom.
It uses pulse-skipping mode under light load to reduce switching losses, with minimum on/off times fixed at 100ns each. Short-circuit protection reduces current limit to ~50% when FB ≈ 0V, and UVLO thresholds are 2.7V (rising) / 2.4V (falling) with 0.35V hysteresis - ensuring robust start-up in automotive cold-crank conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 55V - supports 12V/24V/48V automotive and industrial rails, including cold-crank down to 3.8V. |
| Output Current | 1.5A continuous - limited by internal MOSFET RDS(ON) (250mΩ typ) and thermal design with θJA = 50°C/W. |
| Switching Frequency | Up to 2MHz - programmable via resistor on FREQ pin; enables compact magnetics and avoids AM band EMI. |
| Feedback Reference | 0.800V ±2% - sets output accuracy; allows precise regulation from 0.8V to 52V using external resistive divider. |
| Quiescent Current | 140μA - enables >1-year battery life in always-on systems with 10μA shutdown current. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal layout. |
| Enable Threshold | 1.55V rising / 1.4V falling - provides noise-immune logic-level enable control with 320mV hysteresis. |
Pinout & Package
MPQ4559DN-LF-P is offered in SOIC8E (exposed pad) package, optimized for thermal performance in high-power density applications. The exposed pad must be soldered to a GND plane for effective heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 7) | Input supply rail | Supplies internal regulators and high-side switch; requires local 4.7μF ceramic decoupling. |
| SW (Pins 1,2) | Switch node | Drives external Schottky diode; high dv/dt demands tight layout and low-inductance routing. |
| EN (Pin 2) | Enable control | Positive-logic input; floating default enables device via internal 1μA pull-up. |
| FB (Pin 4) | Feedback input | Senses output voltage divider; 0.1μA max leakage ensures stable regulation with high-R dividers. |
| COMP (Pin 3) | Error amplifier output | Interface for Type II/III compensation network; sets loop stability and transient response. |
| FREQ (Pin 6) | Oscillator programming | Resistor-to-ground sets fSW; 95kΩ yields ~1MHz, 47kΩ yields ~2MHz. |
| BST (Pin 8) | Bootstrap supply | Charges via external capacitor to SW; requires ≥5V headroom for reliable high-side gate drive. |
| GND (Pin 5 + Exposed Pad) | Power and signal ground | Single-point connection to output capacitor cathode and thermal pad minimizes noise and improves thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 250mΩ High-Side MOSFET | Eliminates external switch and driver, reducing BOM count and PCB area in 1.5A buck designs. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +125°C junction operation - suitable for under-hood automotive modules. |
| Ceramic Capacitor Stability | Compensated for zero-ESR output caps - enables use of small, reliable MLCCs instead of bulkier tantalum/electrolytic. |
| Internal Soft-Start (0.5ms) | Prevents output overshoot and inrush current during power-up or fault recovery. |
| Frequency Foldback at Startup | Reduces inductor current runaway during soft-start, improving reliability in high-VIN, low-duty-cycle scenarios. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers display backlight, audio codec, and microcontroller in vehicle head units with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator providing isolated 3.3V/5V rails from noisy automotive battery. Use Value: 2MHz operation avoids AM radio interference; AEC-Q100 qualification ensures reliability over temperature and vibration. | Use Scenario: Generates 5V and 3.3V supplies for digital I/O isolation, sensor interface, and FPGA configuration in factory automation controllers. IC Role / Device Role / Timing Role: High-input-voltage step-down converter handling 36V–55V distributed power bus inputs. Use Value: 55V absolute max rating and 3.8V–55V operating range support brownout resilience and long cable drop compensation. |
| Battery-Powered Telematics Unit | Rail-to-Rail Industrial Sensor Node |
Use Scenario: Powers GPS/GSM module and MCU in asset trackers operating from Li-ion (3.0–4.2V) or 12V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Efficient buck converter with ultra-low IQ (140μA) extending battery runtime in sleep mode. Use Value: 12μA shutdown current and pulse-skipping light-load mode minimize standby loss without external LDO. | Use Scenario: Supplies precision analog front-end (AFE), ADC, and wireless transceiver in condition-monitoring sensors deployed near motors or VFDs. IC Role / Device Role / Timing Role: Robust DC/DC stage rejecting high-voltage transients and EMI from adjacent power electronics. Use Value: 60V absolute max VIN rating and internal thermal shutdown protect against load dump and short-circuit faults. |
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 with 2A output, lower RDS(ON) (160mΩ), improved efficiency, and same 3×3mm QFN10 footprint. | Supports higher load currents and tighter thermal constraints; retains AEC-Q100 Grade 1 and 55V rating. | Preferred for new designs requiring >1.5A or better thermal margin; pin-compatible with MPQ4559DQ but not SOIC8E. |
| LM5164QPWPRQ1 | TI's 1A, 65V synchronous buck with integrated high/low-side FETs, 100μA IQ, and spread-spectrum EMI reduction. | Lacks AEC-Q100 qualification in base grade; requires external compensation and has different pinout/layout. | Consider where synchronous rectification and spread-spectrum EMI control outweigh need for AEC-Q100 compliance. |
Compared with MPQ4559DN-LF-P, MPQ4572DQ-AEC1 offers higher current capability and efficiency in identical QFN packaging, while LM5164QPWPRQ1 trades AEC-Q100 qualification for synchronous operation and advanced EMI features - making MPQ4559DN-LF-P optimal only for legacy SOIC8E-based automotive designs requiring proven qualification and minimal layout change.
Availability
MPQ4559DN-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, and battery-powered telematics units requiring stable component supply and long-term lifecycle support.
Supply support for MPQ4559DN-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 MPQ45xx family targets high-voltage, high-reliability DC/DC conversion for automotive and industrial applications, emphasizing AEC-Q100 qualification, wide input range, and integration to simplify power architecture.
FAQ
Is MPQ4559DN-LF-P still recommended for new designs?
No. MPS explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO MPQ4572" in the datasheet. MPQ4572 offers higher output current (2A), lower RDS(ON), and identical AEC-Q100 qualification - making it the designated upgrade path for all new projects.
What is the maximum achievable output voltage with MPQ4559DN-LF-P?
The device supports output voltages up to 52V, set by the feedback divider ratio (VOUT = 0.8V × (R1+R2)/R2). This limit arises from internal comparator and gate-drive voltage constraints - exceeding 52V risks improper regulation or damage even if VIN remains within 55V.
Can MPQ4559DN-LF-P operate with 3.3V input?
No. The minimum operating input voltage is 3.8V per the Recommended Operating Conditions table. At 3.3V, the internal 2.6V regulator cannot sustain full functionality, and UVLO will prevent startup - this excludes use with single-cell Li-ion (fully discharged ~3.0V) without pre-regulation.
Why does MPQ4559DN-LF-P require an external Schottky diode?
It is a non-synchronous buck converter: the internal high-side MOSFET lacks a complementary low-side switch. The external Schottky diode provides the return current path during the off-time, minimizing forward voltage drop and reverse recovery losses - essential for efficiency above 1A loads.
How is switching frequency programmed on MPQ4559DN-LF-P?
Connect a resistor (RFREQ) from the FREQ pin to GND. The relationship is fSW(kHz) ≈ 100,000 / RFREQ(kΩ). For 2MHz operation, use RFREQ ≈ 47kΩ; for 1MHz, use 95kΩ. Tolerance and temperature drift of the resistor directly affect frequency accuracy.
Does MPQ4559DN-LF-P support forced PWM mode?
No. It operates exclusively in peak-current-mode PWM at medium-to-heavy loads and automatically transitions to pulse-skipping mode at light loads to maintain high efficiency. There is no pin or register to force continuous conduction mode (CCM) across all load conditions.
What is the purpose of the BST pin, and what capacitor value is recommended?
BST supplies gate drive voltage to the internal high-side MOSFET via a bootstrap capacitor between BST and SW. A 0.1μF X7R ceramic capacitor placed directly between BST and SW is recommended - it must withstand ≥12V and be located within 2mm of the pins to minimize parasitic inductance.
MPQ4559DN-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MPQ
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MPQ4559DN-LF-P FAQ
1.How can I place an order for MPQ4559DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4559DN-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 MPQ4559DN-LF-P reliable?
The price and inventory of MPQ4559DN-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 MPQ4559DN-LF-P is usually 5 days.
3.What payment methods are accepted for MPQ4559DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4559DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4559DN-LF-P?
MPQ4559DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4559DN-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 MPQ4559DN-LF-P?
For technical support, including MPQ4559DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4559DN-LF-P requirements.
6.How does Aetrix verify that MPQ4559DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MPQ4559DN-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 MPQ4559DN-LF-P meets industry standards.
7.What is the process for return or replacement of MPQ4559DN-LF-P?
All MPQ4559DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4559DN-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 MPQ4559DN-LF-P part is unused and in its original packaging.
Return procedure for MPQ4559DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPQ4559DN-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…
