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Monolithic Power Systems Inc. MP1584EN-LF
- Part No.:
- MP1584EN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP1584EN-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
MP1584EN-LF from Monolithic Power Systems is a non-synchronous step-down DC/DC converter IC with integrated 150 mΩ high-side MOSFET, delivering up to 3A output current at 1.5MHz switching frequency across a 4.5V–28V input range. It features current-mode control, internal soft-start, and programmable frequency via external resistor for fast transient response in automotive and industrial power rails.
For engineers reviewing the MP1584EN-LF datasheet, MP1584EN-LF pinout, MP1584EN-LF application, or MP1584EN-LF equivalent, key selection criteria include its 0.8V feedback reference, 100µA quiescent current for battery operation, thermal shutdown at 150°C, and SOIC8E package with exposed thermal pad for 2.5W dissipation.
Technical Context
The MP1584EN-LF implements peak-current-mode control with an internal error amplifier (200 V/V gain, 60 µA/V transconductance) and a programmable oscillator whose frequency scales inversely with an external resistor on the FREQ pin (100 kHz to 1.5 MHz). Its COMP pin serves as the error amplifier output for loop compensation.
It integrates UVLO (3.0V rising threshold, 0.35V hysteresis), precision enable logic (1.5V rising, 1.2V falling), and bootstrap charging circuitry regulating BST-to-SW voltage to ~5V. The device uses pulse-skipping mode at light load to maintain high efficiency while preventing inductor current runaway during startup via frequency foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports automotive battery (12V/24V) and industrial wide-input systems without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and communication modules in embedded systems. |
| Switching Frequency | Programmable 100kHz–1.5MHz - enables EMI-sensitive designs (e.g., AM radio, ADSL) and compact filter sizing with 10µH inductors. |
| Feedback Reference | 0.8V ±2.4% - sets output voltage via resistive divider; allows precise 3.3V, 5V, or 12V regulation with standard 1% resistors. |
| Quiescent Current | 100µA typical - extends battery life in always-on or low-duty-cycle portable applications. |
| Thermal Shutdown | 150°C with 15°C hysteresis - provides fault-tolerant protection during overload or poor PCB thermal design. |
| High-Side RDS(ON) | 150 mΩ - limits conduction loss at full load; enables >90% efficiency at 12VIN/5VOUT with proper layout. |
Pinout & Package
The MP1584EN-LF is housed in a thermally enhanced SOIC8E package (8-pin, exposed thermal pad), optimized for surface-mount assembly and PCB-level heat dissipation (θJA = 50°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external Schottky diode; requires short, low-inductance routing to minimize voltage spikes and EMI. |
| 2 EN | Enable Input | Positive-logic control (1.5V rise, 1.2V fall); internal 1µA pull-up allows floating-enable operation. |
| 3 COMP | Compensation Output | Error amplifier output; connects to RC network for loop stability-critical for transient response and phase margin. |
| 4 FB | Feedback Input | Senses output voltage divider; referenced to 0.8V internal bandgap-determines regulated VOUT accuracy. |
| 5 GND | Ground / Exposed Pad | Main power and signal return; exposed pad must be soldered to large copper pour for thermal and EMI performance. |
| 6 FREQ | Frequency Programming | Connects to ground via resistor (e.g., 100kΩ → 500kHz); enables EMI optimization and inductor size trade-offs. |
| 7 VIN | Input Supply | Primary power rail (4.5–28V); requires local 10µF ceramic decoupling close to pin to suppress switching noise. |
| 8 BST | Bootstrap Supply | Charges external capacitor between BST and SW; sustains gate drive for high-side MOSFET during duty cycles >50%. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic capacitor stable | Supports low-ESR ceramic output capacitors without requiring minimum ESR-reduces BOM count and improves reliability. |
| Internal soft-start | 1.5ms ramp time prevents output overshoot and inrush current during power-up-eliminates need for external timing components. |
| No external current sense resistor | Internally set 4.7A current limit avoids power loss and board space overhead of shunt resistors-simplifies layout and cost. |
| Pulse-skipping light-load mode | Maintains >85% efficiency at 10mA load by reducing switching frequency-extends runtime in standby or sensor-monitoring modes. |
| Bootstrap-driven high-side MOSFET | Enables buck topology with single N-channel switch-avoids costly external high-side driver or P-channel MOSFET. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Supplies 3.3V to MCU, CAN transceiver, and display controller in head unit under 9–16V battery input with cold-crank dips. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, low-noise 3.3V rail with fast line transient recovery to maintain system uptime during engine cranking. Use Value: 1.5MHz operation avoids AM band interference; 28V max input withstands load-dump transients; 100µA IQ preserves battery during ignition-off monitoring. |
Use Scenario: Powers isolated digital I/O circuits and analog front-end in DIN-rail mounted PLC with 24V DC field supply. IC Role / Device Role / Timing Role: Local point-of-load converter delivering 5V/3A to FPGA-based logic and ADC drivers with minimal external components. Use Value: SOIC8E thermal pad ensures reliable operation at 70°C ambient; programmable frequency allows EMI filtering alignment with system clock domains. |
| Battery-Powered Telematics Unit | Distributed Telecom Power System |
|
Use Scenario: Converts Li-ion battery (3.0–4.2V) or 12V vehicle supply to 1.8V core voltage for GPS/GSM SoC in asset tracker. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in pulse-skipping mode during sleep cycles to maximize battery longevity. Use Value: 100µA quiescent current enables multi-year operation on 2000mAh cell; internal current limit protects against shorted antenna or SIM card faults. |
Use Scenario: Generates 12V intermediate rail from 48V telecom backplane for downstream DC/DC converters in remote radio head. IC Role / Device Role / Timing Role: Robust front-end step-down stage handling wide input variation and high ambient temperature in outdoor enclosures. Use Value: 28V absolute max rating accommodates 48V transients; thermal shutdown + foldback prevents latch-up during overtemperature events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2338DJ-LF-Z | Pin-compatible successor with 4A output, lower RDS(ON) (85 mΩ), and improved light-load efficiency (30µA IQ). | Designed for new designs requiring higher current density and extended battery life; supports same SOIC8E footprint. | Select MP2338DJ-LF-Z for new projects where higher output current, lower thermal stress, or longer battery runtime are critical. |
| LM2678SD-5.0/NOPB | Fixed 5V output, 5A capability, 260 kHz fixed frequency, no frequency programming or pulse-skipping mode. | Targets cost-sensitive industrial supplies where fixed output and lower EMI priority outweigh light-load efficiency needs. | Choose LM2678SD-5.0/NOPB only when 5V fixed output suffices and 100µA IQ is not required-requires redesign for adjustable outputs. |
Compared with MP1584EN-LF, MP2338DJ-LF-Z delivers higher current and lower quiescent power but requires updated compensation; LM2678SD-5.0/NOPB offers fixed 5V simplicity at the expense of flexibility and battery efficiency.
Availability
MP1584EN-LF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and battery-powered telematics requiring stable component supply and long-term lifecycle support.
Supply support for MP1584EN-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 expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP1584 belongs to MPS's legacy high-voltage buck converter product line, designed for robust, cost-effective power conversion in automotive, industrial, and distributed systems where wide input range and thermal resilience are essential.
FAQ
What is the maximum recommended output current for MP1584EN-LF under continuous operation?
The MP1584EN-LF delivers up to 3A continuous output current when properly heatsinked on a 4-layer PCB with ≥2 cm² exposed thermal pad copper area. At 25°C ambient and 12V input, derating begins above 2.2A due to thermal limits; full 3A is achievable with forced airflow or reduced ambient temperature.
Can MP1584EN-LF operate with a 3.3V input supply?
No. MP1584EN-LF requires a minimum 4.5V input due to its internal UVLO threshold of 2.7–3.3V and bootstrap charging constraints. Below 4.5V, the BST capacitor cannot charge sufficiently to drive the high-side MOSFET, causing regulation failure or intermittent operation.
Is an external Schottky diode mandatory for MP1584EN-LF operation?
Yes. As a non-synchronous buck converter, MP1584EN-LF relies on an external Schottky diode (e.g., B340A-13-F) connected from SW to GND to provide the freewheeling path. Omitting it causes catastrophic failure due to inductive kickback and lack of current continuity.
How does the FREQ pin resistor value affect switching frequency?
The FREQ pin sets frequency via RFREQ (kΩ) to ground using fSW(kHz) ≈ 1800 / RFREQ. For example, 100 kΩ yields ~18 kHz (not 500 kHz)-the datasheet correction factor is 1.1×, so actual RFREQ = 1.1 × 1800 / fSW. A 100 kΩ resistor gives ~19.8 kHz, not 500 kHz; 3.6 kΩ achieves 500 kHz.
What is the purpose of the exposed pad on the SOIC8E package?
The exposed pad on MP1584EN-LF's SOIC8E is electrically connected to GND and serves as the primary thermal conduction path. It must be soldered to a ≥2 cm² internal or external GND copper plane with ≥4 thermal vias (0.3mm diameter) to achieve θJA = 50°C/W and prevent thermal shutdown at full load.
Does MP1584EN-LF support output voltages below 0.8V?
No. The internal 0.8V feedback reference is fixed and unadjustable. Output voltage is calculated as VOUT = 0.8V × (1 + R1/R2), making sub-0.8V regulation impossible without external circuitry such as a resistive divider offset or op-amp buffer-which voids guaranteed performance and stability.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
MPS has superseded MP1584EN-LF with the MP2338 series, which offers higher current (4A), lower RDS(ON), improved efficiency, and extended lifetime. While MP1584EN-LF remains in production and supported, new designs should use MP2338DJ-LF-Z unless legacy qualification or cost constraints mandate the older part.
MP1584EN-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):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP1584EN-LF FAQ
1.How can I place an order for MP1584EN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1584EN-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 MP1584EN-LF reliable?
The price and inventory of MP1584EN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1584EN-LF is usually 5 days.
3.What payment methods are accepted for MP1584EN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1584EN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1584EN-LF?
MP1584EN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1584EN-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 MP1584EN-LF?
For technical support, including MP1584EN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1584EN-LF requirements.
6.How does Aetrix verify that MP1584EN-LF is sourced from the original manufacturer or authorized distributors?
All MP1584EN-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 MP1584EN-LF meets industry standards.
7.What is the process for return or replacement of MP1584EN-LF?
All MP1584EN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP1584EN-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 MP1584EN-LF part is unused and in its original packaging.
Return procedure for MP1584EN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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