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Monolithic Power Systems Inc. MP4559DN-LF
- Part No.:
- MP4559DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP4559DN-LF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
MP4559DN-LF 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 current-mode control, internal soft-start, and 140μA quiescent current-enabling use in automotive power rails and battery-powered industrial sensors.
For engineers reviewing the MP4559DN-LF datasheet, MP4559DN-LF pinout, MP4559DN-LF application, or MP4559DN-LF equivalent, key selection criteria include its programmable 2MHz oscillator (via FREQ pin), 0.8V feedback reference accuracy (±2.5%), thermal shutdown threshold (150°C), and compatibility with ceramic output capacitors without external compensation components.
Technical Context
The MP4559DN-LF implements peak-current-mode PWM control with cycle-by-cycle current limiting and frequency foldback during startup or short-circuit conditions. Its error amplifier delivers 400V/V gain and 120μA/V transconductance, with COMP pin clamped between 0.9V and 2.0V for stable loop dynamics.
Bootstrap charging relies on an external BST–SW capacitor regulated to ~5V; operation above 1.5MHz requires an external Schottky diode due to minimum on-time (100ns) and bootstrap recharge timing constraints. UVLO thresholds are 2.7V (rising) and 2.4V (falling), with 320mV hysteresis on EN pin.
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 4.5V) and industrial 48V rails. |
| Output Current | 1.5A continuous - limited by internal MOSFET RDS(ON) (250mΩ typ) and thermal resistance (θJA = 50°C/W). |
| Switching Frequency | Programmable up to 2MHz - set via resistor from FREQ pin to GND; enables compact magnetics and AM-band EMI avoidance. |
| Feedback Reference | 0.800V ±2.5% - sets output voltage via external resistor divider; enables adjustable outputs from 0.8V to 52V. |
| Quiescent Current | 140μA - enables >1-year battery life in always-on sensor nodes powered from 3.7V Li-ion cells. |
| Shutdown Current | 12μA - ensures minimal drain during system sleep modes; enabled by EN pin logic threshold (1.55V rising). |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MP4559DN-LF is supplied in SOIC-8E (exposed pad) package, optimized for thermal dissipation in high-power-density layouts. Exposed pad must be soldered to solid GND plane for θJA = 50°C/W performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Node | High dv/dt node connecting internal MOSFET drain to external Schottky rectifier; requires tight layout to minimize EMI and ringing. |
| 2 (EN) | Enable Input | Positive-logic control pin with 1.55V rising threshold; internal 1µA pull-up allows floating-enable configuration. |
| 3 (COMP) | Error Amplifier Output | Current-source output for loop compensation; clamped 0.9–2.0V; connects to RC network for stability tuning. |
| 4 (FB) | Feedback Input | Senses resistive divider output; compares to 0.8V internal reference to regulate VOUT with ±2.5% accuracy. |
| 5 (GND) | Power Ground | Primary return path for switch current and IC bias; exposed pad must be low-inductance GND connection. |
| 6 (FREQ) | Frequency Set | Connects to ground via resistor (e.g., 95kΩ for 1MHz); linear scaling enables precise EMI-sensitive frequency placement. |
| 7 (VIN) | Input Supply | Accepts full 3.8–55V range; internal 2.6V regulator powers control circuitry; requires local 4.7µF ceramic decoupling. |
| 8 (BST) | Bootstrap Supply | Drives high-side gate; requires 0.1µF ceramic capacitor between BST and SW; external diode recommended above 1.5MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic-capacitor stable | Compensated for zero-ESR output caps; eliminates need for tantalum/electrolytic and simplifies BOM in space-constrained designs. |
| Internal soft-start | 0.5ms ramp time prevents output overshoot during cold-start or load recovery; avoids inrush-triggered system resets. |
| Frequency foldback | Reduces switching frequency under overload to limit peak inductor current and prevent thermal runaway during short-circuit events. |
| Light-load efficiency mode | Stretches switching frequency to near-zero under light loads; cuts gate-drive and switching losses to sustain >85% efficiency at 1mA load. |
| Robust bootstrap management | Dedicated 5V BST regulator with UVLO (2.2V threshold) and 20µs noise immunity delay prevents false shutdown during transient spikes. |
Applications
| Automotive Body Control Module | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and analog front-end from 12V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary 3.3V/1.5A buck regulator; handles input dips to 4.5V and transients up to 55V. Use Value: Eliminates need for pre-regulator stage; 140μA IQ extends battery backup runtime during ignition-off monitoring. |
Use Scenario: Converting 24V industrial rail to 5V for LoRaWAN modem and MEMS accelerometer in predictive maintenance node. IC Role / Device Role / Timing Role: High-voltage step-down converter with programmable 2MHz switching to avoid RF interference with sub-GHz radio band. Use Value: Enables use of 4.7µH inductor and 22µF ceramic output cap-reducing solution size by 40% vs. 500kHz alternatives. |
| Distributed Power Architecture | Battery-Powered Test Equipment |
Use Scenario: Local 5V supply for FPGA I/O banks in modular PLC backplane with varying slot loads. IC Role / Device Role / Timing Role: Point-of-load regulator accepting 36–55V backplane voltage; maintains regulation during hot-swap insertion. Use Value: Wide VIN range avoids dedicated 48V-to-12V intermediate stage; 95% peak efficiency reduces thermal load on dense PCB. |
Use Scenario: Portable multimeter requiring stable 3.3V rail from two-series Li-ion (6–8.4V) with <100μA standby draw. IC Role / Device Role / Timing Role: Low-IQ buck converter with shutdown mode; EN pin controlled by MCU GPIO for full system power gating. Use Value: 12μA shutdown current enables >3-year shelf life; internal soft-start prevents measurement offset during wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4572DN-LF | Successor device with improved 1.2A current limit, lower 100μA IQ, and enhanced thermal shutdown hysteresis (25°C). | Pin-compatible but requires updated FREQ resistor; supports same SOIC8E footprint and layout. | Select for new designs requiring longer battery life and tighter thermal margin; not drop-in due to changed current limit and FB accuracy (±1%). |
| LM5164QDGQRQ1 | Automotive-grade 1A buck with integrated high-side FET, 65V abs max, and AEC-Q100 Grade 1 qualification. | Requires external compensation; lacks programmable frequency and soft-start; rated for –40°C to +125°C junction. | Choose when automotive qualification or 65V absolute max rating is mandatory; accept larger solution size and higher BOM count. |
Compared with MP4559DN-LF, MP4572DN-LF offers lower quiescent current and tighter feedback tolerance but reduced output current, while LM5164QDGQRQ1 provides automotive qualification and higher voltage robustness at the cost of design flexibility and component count.
Availability
MP4559DN-LF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, distributed power systems, and portable test equipment requiring stable component supply through extended product lifecycle phases.
Supply support for MP4559DN-LF 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 20 years of expertise in DC/DC conversion and motor control solutions.
The MP45xx series targets high-input-voltage industrial and automotive applications where wide VIN range, small footprint, and low IQ are critical-designed specifically for direct battery-fed subsystems without intermediate regulation.
FAQ
What is the maximum recommended output current for MP4559DN-LF at 55V input?
At 55V input, continuous output current is limited to 1.5A by thermal constraints-not electrical capability. With SOIC8E package and standard 4-layer board, junction temperature reaches 125°C at 1.5A/12V out; derate to 1.1A at 55V input to maintain TJ ≤ 125°C per θJA = 50°C/W and PD = (TJ(MAX) − TA)/θJA.
Can MP4559DN-LF operate without an external bootstrap diode at 2MHz?
No-operation at 2MHz requires an external Schottky diode (e.g., CMSH2-100M) from VIN to BST to ensure reliable bootstrap capacitor recharge. Internal bootstrap driver impedance increases at high frequency, causing insufficient charge transfer during the short (1−D)×Ts interval; omission risks intermittent shutdown or erratic switching.
Is MP4559DN-LF RoHS-compliant and lead-free?
Yes-MP4559DN-LF carries the "-LF" suffix indicating lead-free, RoHS-compliant packaging per MPS green status documentation. All solderable surfaces meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and Pb-free reflow profile requirements.
How does frequency foldback improve reliability during startup?
During startup into heavy or shorted loads, frequency foldback reduces switching frequency to limit peak inductor current and prevent magnetic saturation. This avoids excessive switch stress and thermal accumulation before regulation is established-critical for robustness in automotive cold-crank scenarios.
What is the minimum output voltage achievable with MP4559DN-LF?
The minimum regulated output voltage is 0.8V, set by the internal feedback reference. Achieving lower voltages (e.g., 0.6V) is not supported-attempting so causes loss of regulation as the error amplifier cannot drive COMP below 0.9V, resulting in uncontrolled duty cycle and potential overvoltage.
Does MP4559DN-LF support synchronous rectification?
No-MP4559DN-LF is a non-synchronous buck converter requiring an external Schottky diode for freewheeling current path. It lacks a low-side gate driver or control logic for synchronous MOSFET; replacement with MP4572DN-LF does not add sync capability either.
Why is MP4559DN-LF marked "Not Recommended for New Designs"?
MPS designates MP4559DN-LF as NRND because MP4572DN-LF offers superior specifications (lower IQ, tighter FB tolerance, improved thermal behavior) in identical SOIC8E packaging. While MP4559DN-LF remains fully qualified and supported, new designs should adopt MP4572DN-LF for long-term supply assurance and performance gains.
MP4559DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- 8-SOIC-EP
MP4559DN-LF FAQ
1.How can I place an order for MP4559DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4559DN-LF 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 MP4559DN-LF reliable?
The price and inventory of MP4559DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4559DN-LF is usually 5 days.
3.What payment methods are accepted for MP4559DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4559DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4559DN-LF?
MP4559DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4559DN-LF 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 MP4559DN-LF?
For technical support, including MP4559DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4559DN-LF requirements.
6.How does Aetrix verify that MP4559DN-LF is sourced from the original manufacturer or authorized distributors?
All MP4559DN-LF 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 MP4559DN-LF meets industry standards.
7.What is the process for return or replacement of MP4559DN-LF?
All MP4559DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP4559DN-LF, 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 MP4559DN-LF part is unused and in its original packaging.
Return procedure for MP4559DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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