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Monolithic Power Systems Inc. MP1584EN-LF-Z
- Part No.:
- MP1584EN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP1584EN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:1,053
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Product details
Overview
MP1584EN-LF-Z 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 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-Z datasheet, MP1584EN-LF-Z pinout, MP1584EN-LF-Z application, or MP1584EN-LF-Z equivalent, key selection criteria include its 0.8V feedback reference, 100 µA 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-Z uses peak current-mode control with an internal error amplifier (200 V/V gain, 60 µA/V transconductance) and COMP pin-based loop compensation. Its oscillator supports programmable frequency from 100 kHz to 1.5 MHz via resistor-to-ground on FREQ pin, enabling EMI-sensitive designs like AM radio and ADSL systems.
It integrates UVLO (3.0V rising threshold, 0.35V hysteresis), precision enable logic (1.5V rising, 1.2V falling thresholds), and bootstrap charging circuitry regulating BST–SW to ~5V. Startup includes 1.5 ms internal soft-start ramp and 50 µs blanking to suppress turn-on glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports mid-power loads without external MOSFETs or heatsinking in compact layouts. |
| Input Voltage Range | 4.5V to 28V - accommodates 12V/24V automotive batteries and industrial wide-input supplies. |
| Switching Frequency | Up to 1.5MHz - enables small LC filters and avoids AM band interference (530–1710 kHz). |
| Feedback Reference | 0.8V ±2.4% - sets output voltage precisely using standard resistor dividers (e.g., 3.3V with 40.2kΩ/127kΩ). |
| Quiescent Current | 100 µA typical - extends runtime in always-on battery-powered systems like telematics or sensors. |
| Thermal Shutdown | 150°C with 15°C hysteresis - provides fault-tolerant protection during overload or poor PCB thermal design. |
| Package Thermal Resistance | θJA = 50°C/W (SOIC8E, 4-layer PCB) - requires exposed pad soldered to ground plane for reliable 2.5W operation. |
Pinout & Package
MP1584EN-LF-Z is housed in a thermally enhanced SOIC8E package (8-pin, exposed thermal pad). The exposed pad must be soldered to a PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | High-current output of internal MOSFET; connects directly to Schottky catch diode cathode and inductor. |
| 2 EN | Enable Input | Positive-logic control: >1.5V enables, <1.2V disables; internal 1µA pull-up allows floating-enable operation. |
| 3 COMP | Compensation Node | Error amplifier output; external RC network sets loop stability, phase margin, and transient response. |
| 4 FB | Feedback Input | Senses divided output voltage; compares to 0.8V internal reference to regulate VOUT with ±2.4% accuracy. |
| 5 GND | Ground / Exposed Pad | Main power and signal return; exposed pad must be low-impedance connection to PCB ground plane. |
| 6 FREQ | Frequency Programming | Resistor-to-ground sets switching frequency from 100kHz to 1.5MHz (e.g., 100kΩ → ~500kHz). |
| 7 VIN | Input Supply | Powers internal regulators and high-side switch; requires local 10µF ceramic decoupling capacitor. |
| 8 BST | Bootstrap Supply | Charges internal high-side driver via external 0.1µF capacitor between BST and SW pins. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic capacitor stable | Supports low-ESR ceramic output capacitors without oscillation-eliminates need for tantalum or electrolytic types. |
| Internally set current limit | 4.7A typical cycle-by-cycle limit-no external sense resistor required, reducing BOM count and layout area. |
| High-efficiency pulse-skipping mode | Reduces switching losses at light load by scaling frequency downward-maintains >85% efficiency at 10mA output. |
| Internal soft-start | 1.5ms controlled VOUT ramp-prevents overshoot and inrush current during power-up in sensitive systems. |
| Bootstrap charging regulation | Internal 5V BST regulator with UVLO (2.2V) ensures reliable high-side gate drive across full duty cycle range. |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Supplies 3.3V/2A to MCU, CAN transceiver, and display controller in head unit under cold-crank (6.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12V battery to stable 3.3V rail with fast line transient response to engine cranking dips. Use Value: Wide 4.5V–28V input range and 150°C thermal shutdown ensure uninterrupted operation across automotive temperature and voltage extremes. |
Use Scenario: Powers isolated analog front-end and digital logic in DIN-rail mounted PLC module operating from 24V industrial bus. IC Role / Device Role / Timing Role: Non-isolated buck converter delivering 5V/3A to microcontroller and ADC subsystem with minimal external components. Use Value: 1.5MHz switching enables compact 10µH inductor and 22µF ceramic output cap-reducing board space by >40% vs. 500kHz alternatives. |
| Battery-Powered Telematics Tracker | Distributed Telecom Power System |
|
Use Scenario: Powers GPS/GSM module in asset tracker running on Li-ion (3.0–4.2V) boosted to 12V, then stepped down to 3.3V. IC Role / Device Role / Timing Role: Secondary buck stage after boost converter; operates in pulse-skipping mode during sleep (10µA system current). Use Value: 100 µA quiescent current and programmable frequency allow optimization for ultra-low standby power without sacrificing wake-up speed. |
Use Scenario: Provides 12V intermediate rail in telecom shelf powering multiple point-of-load converters for FPGA and SerDes interfaces. IC Role / Device Role / Timing Role: High-voltage intermediate converter accepting 28V backplane input and delivering regulated 12V at 3A with tight ripple control. Use Value: 28V absolute max input rating and 150 mΩ RDS(ON) MOSFET enable efficient conversion at high input-to-output ratios with <150mV output ripple. |
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 80 mΩ RDS(ON), and improved light-load efficiency (75 µA IQ). | Designed for new designs requiring higher current or longer battery life; not drop-in due to different soft-start timing. | Select MP2338 if upgrading from MP1584 in production and needing higher reliability margin or extended lifetime support. |
| LM2678SD-ADJ/NOPB | Fixed 5V/3.3V variants available; 63 µA IQ but only 2.5A output and 260 mΩ RDS(ON); no frequency programming. | Legacy TI solution with mature qualification; lacks programmable frequency and ceramic-cap stability of MP1584. | Prefer LM2678 only for cost-sensitive, low-frequency (<300kHz), non-automotive applications where footprint compatibility is critical. |
Compared with MP1584EN-LF-Z, MP2338DJ-LF-Z offers higher current and efficiency but requires minor layout updates, while LM2678SD-ADJ/NOPB trades flexibility for legacy supply chain assurance at lower switching performance.
Availability
MP1584EN-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC modules, and battery-powered telematics requiring stable component supply through extended product lifecycles.
Supply support for MP1584EN-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, headquartered in Kirkland, WA, with global design and support centers.
The MP1584 belongs to MPS's high-voltage buck converter product line, engineered for rugged, high-efficiency DC/DC conversion in automotive, industrial, and telecom environments where input transients and thermal stress are common.
FAQ
What is the maximum recommended output voltage for MP1584EN-LF-Z?
The MP1584EN-LF-Z supports output voltages from 0.8V to 25V, limited by the 28V absolute maximum input rating and internal feedback reference tolerance. For 25V output, VIN must remain ≤28V with sufficient headroom for dropout and ripple; practical designs typically cap VOUT at 20V to maintain safety margin and thermal stability.
Can MP1584EN-LF-Z operate with 100% duty cycle?
No. MP1584EN-LF-Z cannot sustain 100% duty cycle due to bootstrap capacitor recharge requirement: the high-side MOSFET driver needs periodic SW node discharge (via external diode or synchronous rectifier) to replenish BST voltage. Minimum off-time is guaranteed at 100 ns, enforcing <99.5% practical duty cycle ceiling.
Is an external Schottky diode mandatory for MP1584EN-LF-Z?
Yes. As a non-synchronous buck converter, MP1584EN-LF-Z requires an external Schottky diode connected from SW to GND. Diode selection must meet ≥28V reverse voltage rating and ≥3A average current handling; recommended parts include B340A-13-F (40V/3A) or CMSH3-40MA.
How does frequency foldback improve light-load efficiency?
At light loads, MP1584EN-LF-Z reduces switching frequency below nominal value-lowering gate drive and switching losses-while maintaining regulation via pulse-skipping. This achieves >85% efficiency at 10mA output, versus fixed-frequency operation which would waste energy in unnecessary transitions.
What is the purpose of the exposed pad on the SOIC8E package?
The exposed pad on MP1584EN-LF-Z's SOIC8E package serves dual functions: it is electrically connected to GND for signal integrity and acts as the primary thermal path. Soldering it to a large PCB copper pour reduces θJA by up to 20°C/W, enabling full 3A operation at +85°C ambient without derating.
Does MP1584EN-LF-Z support synchronization to an external clock?
No. MP1584EN-LF-Z does not support external clock synchronization. Its oscillator is resistor-programmable only (FREQ pin to GND), with frequency range 100 kHz–1.5 MHz. For synchronized multi-rail systems, use MPS's MP2338 or MPQ4420A, which offer SYNC pin capability.
Why is the FB pin voltage specified as 0.8V ±2.4%?
The 0.8V ±2.4% (0.776V–0.824V) tolerance reflects the internal bandgap reference accuracy over temperature and process variation. This directly impacts output voltage accuracy: for a 5V output set by 40.2kΩ/10kΩ divider, total VOUT error is ±2.4% plus resistor tolerance, yielding ±3% typical total error.
MP1584EN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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-Z FAQ
1.How can I place an order for MP1584EN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1584EN-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 MP1584EN-LF-Z reliable?
The price and inventory of MP1584EN-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 MP1584EN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1584EN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1584EN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1584EN-LF-Z?
MP1584EN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1584EN-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 MP1584EN-LF-Z?
For technical support, including MP1584EN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1584EN-LF-Z requirements.
6.How does Aetrix verify that MP1584EN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1584EN-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 MP1584EN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1584EN-LF-Z?
All MP1584EN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1584EN-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 MP1584EN-LF-Z part is unused and in its original packaging.
Return procedure for MP1584EN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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