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Monolithic Power Systems Inc. MP1586EN-LF
- Part No.:
- MP1586EN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP1586EN-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:4,104
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Product details
Overview
MP1586EN-LF from Monolithic Power Systems is a non-synchronous step-down DC/DC converter IC with integrated 28V high-side MOSFET, delivering up to 3A output current, operating from 4.5V–28V input, programmable 50kHz–400kHz switching frequency, and 115µA quiescent current-designed for automotive power rails and battery-powered industrial systems.
For engineers reviewing the MP1586EN-LF datasheet, MP1586EN-LF pinout, MP1586EN-LF application, or MP1586EN-LF equivalent, this page provides verified functional identity, SOIC8E package mapping, thermal shutdown and UVLO thresholds, current-mode control behavior, and validated alternative selection guidance.
Technical Context
The MP1586EN-LF implements peak current-mode control with internal error amplifier (200 V/V gain, 60 µA/V transconductance), programmable oscillator via external resistor on FREQ pin, and bootstrap-driven high-side gate driver regulated to ~5V. Its minimum on/off time is 100 ns each, enabling stable operation at high duty cycles up to ~90%.
It features precision enable logic (1.35V–1.65V rising threshold, 300 mV hysteresis), internal soft-start (1.5 ms ramp), and thermal shutdown activation at 150°C with 15°C hysteresis. The device operates in pulse-skipping mode at light load to maintain efficiency, and includes internal current limiting (4.7 A typical) without external sense resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports 12V/24V automotive and industrial bus inputs without pre-regulation |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems |
| Switching Frequency | 50kHz to 400kHz - adjustable via external resistor; enables EMI optimization and inductor size trade-off |
| Quiescent Current | 115µA - enables >1-year battery life in always-on IoT nodes with 200mAh coin cell |
| Feedback Reference | 0.8V ±2.4% - sets output voltage via resistive divider; allows 0.8V–25V regulation range |
| Thermal Shutdown | 150°C activation - protects against sustained overload or poor PCB heatsinking in enclosed enclosures |
| UVLO Threshold | 3.0V rising / 2.7V falling - prevents erratic startup during cold-cranking or brownout in automotive environments |
Pinout & Package
The MP1586EN-LF is housed in a thermally enhanced SOIC8E package (exposed pad), optimized for surface-mount assembly and PCB-level heat dissipation. The exposed GND pad must be soldered to a large copper plane for θJC = 10°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external Schottky diode; high dv/dt node requiring short trace routing and local decoupling |
| 2 EN | Enable Input | Positive-logic control with 1.5V threshold; internal 1µA pull-up allows floating-enable operation |
| 3 COMP | Compensation Output | Error amplifier output; connects to RC network for loop stability tuning and transient response shaping |
| 4 FB | Feedback Input | Senses scaled output voltage; referenced to internal 0.8V bandgap for precise regulation |
| 5 GND | Ground / Exposed Pad | Main power and signal return; exposed pad must be connected to solid ground plane for thermal and EMI integrity |
| 6 FREQ | Frequency Program | Resistor-to-ground sets oscillator frequency; 100kΩ yields ~250kHz per datasheet equation |
| 7 VIN | Input Supply | Powers internal circuitry and high-side driver; requires local 10µF ceramic bypass capacitor |
| 8 BST | Bootstrap Supply | Charges external 0.1µF capacitor between BST–SW to sustain high-side gate drive above VIN |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High-Side MOSFET | RDS(ON) = 150 mΩ - eliminates external switch, reduces BOM count, and simplifies layout |
| Ceramic Capacitor Stable | Compatible with low-ESR MLCCs - avoids tantalum/electrolytic dependency and improves reliability |
| Internal Soft-Start | 1.5 ms controlled ramp - prevents output overshoot and inrush current during power-up |
| Current Limit Without Sense Resistor | 4.7 A typical limit - removes need for power-wasting current-sense resistor and associated PCB area |
| Frequency Foldback | Reduces fSW at light load - lowers gate-driving and switching losses to sustain >85% efficiency down to 1mA load |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering 3.3V MCU, CAN transceiver, and display driver from 12V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3V rail with UVLO hysteresis and thermal fault protection. Use Value: 115µA quiescent current extends battery life during vehicle sleep mode; 28V rating survives load-dump transients. | Use Scenario: Converting 24V factory bus to 5V for analog sensor signal conditioning and wireless module interface. IC Role / Device Role / Timing Role: High-voltage step-down converter enabling direct connection to industrial 24V supply without intermediate stage. Use Value: 4.5V–28V input range eliminates need for upstream pre-regulator; SOIC8E package supports automated SMT assembly. |
| Portable Medical Device Rail | Distributed Telecom Backup Supply |
Use Scenario: Generating 1.8V core voltage for low-power ARM Cortex-M processor from dual-cell Li-ion (6V–8.4V). IC Role / Device Role / Timing Role: Efficient main power converter operating in pulse-skipping mode during standby monitoring intervals. Use Value: Pulse-skipping mode maintains >90% efficiency at 100µA load, extending clinical-grade battery runtime beyond 72 hours. | Use Scenario: Providing 12V auxiliary rail from 48V telecom backup battery during AC mains failure. IC Role / Device Role / Timing Role: High-input-voltage buck converter supporting wide-range battery discharge (48V–36V) while maintaining tight output regulation. Use Value: 28V absolute max rating ensures safe operation across full 48V battery range; thermal shutdown prevents field failures under sustained overload. |
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 | Successor part: synchronous rectification, 4A output, 2.5V–18V input, 500kHz fixed frequency, lower IQ (25µA) | Replaces MP1586EN-LF in new designs requiring higher efficiency, smaller solution size, and no external diode | Select MP2338DJ-LF-Z for production designs where EOL status, efficiency, and footprint matter; verify layout compatibility due to different pinout and thermal pad geometry |
| LM2678SD-ADJ/NOPB | Non-synchronous buck, 5A output, 8V–40V input, 260kHz fixed frequency, 50µA IQ, requires external diode | Offers wider input range and higher current but lacks programmable frequency and ceramic-capacitor stability guarantee | Choose LM2678SD-ADJ/NOPB only if 40V input capability is mandatory and design can accommodate larger inductor and diode footprint |
Compared with MP1586EN-LF, MP2338DJ-LF-Z delivers higher efficiency and integration at lower IQ but requires board redesign; LM2678SD-ADJ/NOPB extends input range but sacrifices light-load efficiency and compensation flexibility-making MP1586EN-LF optimal for legacy 24V/28V systems needing drop-in replacement with known thermal behavior.
Availability
MP1586EN-LF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical devices requiring stable component supply amid end-of-life transitions.
Supply support for MP1586EN-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 two decades of leadership in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP1586 belongs to MPS's legacy high-voltage buck converter product line, engineered for robustness in automotive and industrial environments where wide input range, thermal resilience, and minimal external components are critical.
FAQ
Is MP1586EN-LF still in active production?
No-MP1586EN-LF is officially marked End-of-Life (EOL) by Monolithic Power Systems, with MP2338 designated as its functional successor. Aetrix Electronics maintains limited legacy stock for continuity support but does not accept new long-term forecasts for this part.
Can MP1586EN-LF operate without an external Schottky diode?
No-it is a non-synchronous buck converter requiring an external Schottky diode (e.g., B340A-13-F) connected from SW to GND. The diode conducts inductor current when the internal high-side MOSFET is off; omission causes catastrophic failure.
What is the maximum achievable output voltage with MP1586EN-LF?
The datasheet specifies a maximum output voltage of 25V, constrained by the 30V absolute maximum rating on the SW pin and internal feedback reference accuracy. At 25V output, ensure VIN ≤ 28V and use appropriate high-voltage diode and capacitor ratings.
How does frequency foldback improve light-load efficiency?
Frequency foldback reduces switching frequency proportionally to load current, lowering gate-driving and switching losses. At 10mA load, fSW may drop to ~50kHz, cutting dynamic losses by >60% versus fixed-frequency operation-directly enabling the 115µA quiescent current spec.
Why is the SOIC8E exposed pad critical for thermal performance?
The exposed pad serves as the primary thermal path from die to PCB. With θJC = 10°C/W, soldering it to ≥2 cm² of 2-oz copper reduces junction-to-board temperature rise by ~40°C versus standard SOIC8-preventing thermal shutdown at 3A load in ambient temperatures up to +70°C.
Does MP1586EN-LF support output voltages below 0.8V?
No-the internal feedback reference is fixed at 0.8V ±2.4%. Output voltage is set by VOUT = 0.8V × (1 + R1/R2); therefore, the lowest practical output is ~0.8V. For sub-0.8V rails, a different controller with adjustable reference or external reference injection is required.
MP1586EN-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:
- Obsolete
- 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:
- 50kHz ~ 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP1586EN-LF FAQ
1.How can I place an order for MP1586EN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1586EN-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 MP1586EN-LF reliable?
The price and inventory of MP1586EN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1586EN-LF is usually 5 days.
3.What payment methods are accepted for MP1586EN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1586EN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1586EN-LF?
MP1586EN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1586EN-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 MP1586EN-LF?
For technical support, including MP1586EN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1586EN-LF requirements.
6.How does Aetrix verify that MP1586EN-LF is sourced from the original manufacturer or authorized distributors?
All MP1586EN-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 MP1586EN-LF meets industry standards.
7.What is the process for return or replacement of MP1586EN-LF?
All MP1586EN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP1586EN-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 MP1586EN-LF part is unused and in its original packaging.
Return procedure for MP1586EN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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