My Inquiry
My Account
Monolithic Power Systems Inc. MP1586EN-LF-Z
- Part No.:
- MP1586EN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP1586EN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:1,183
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP1586EN-LF-Z from Monolithic Power Systems is a non-synchronous step-down DC-DC converter with integrated 28V high-side MOSFET, delivering up to 3A output current, programmable 50–400kHz switching frequency, and 4.5–28V input range. It employs current-mode control for fast transient response and operates in pulse-skipping mode at light load to achieve 115µA quiescent current-enabling use in automotive infotainment power rails and industrial 24V distributed supplies.
For engineers reviewing the MP1586EN-LF-Z datasheet, MP1586EN-LF-Z pinout, MP1586EN-LF-Z application, or MP1586EN-LF-Z equivalent, key selection considerations include its SOIC8E thermal performance (θJA = 50°C/W), internal soft-start, bootstrap capacitor dependency, and end-of-life status requiring migration planning to MP2338.
Technical Context
The MP1586EN-LF-Z implements fixed-frequency peak-current-mode control with cycle-by-cycle current limiting and internal 0.8V reference. Its error amplifier features 200V/V gain and 60µA/V transconductance, with COMP pin clamped between 0.9V and 2.0V during regulation.
Switching is governed by an external resistor on FREQ pin (100kΩ yields ~250kHz), while bootstrap charging relies on VIN–SW voltage headroom and includes UVLO (2.2V rising threshold). Thermal shutdown activates at 150°C with 15°C hysteresis, and EN pin enables positive-logic control with 1.5V rising/1.2V falling thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports direct connection to automotive battery (12V/24V) and industrial 24V rails without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Switching Frequency | 50kHz to 400kHz - adjustable via external resistor; higher frequencies reduce inductor size but increase switching loss. |
| Quiescent Current | 115µA - enables >1-year battery life in always-on IoT sensor nodes with Li-ion or coin-cell sources. |
| Feedback Reference | 0.8V ±2.4% - sets output voltage via resistive divider; allows precise 1.8V–25V outputs with minimal component count. |
| High-Side RDS(on) | 150mΩ - limits conduction loss at 3A (≤1.35W), enabling thermally viable operation in SOIC8E without forced air. |
| Thermal Shutdown | 150°C with 15°C hysteresis - prevents permanent damage during overload or poor PCB copper area; auto-recovery after cooldown. |
Pinout & Package
The MP1586EN-LF-Z is housed in a thermally enhanced SOIC8E package (exposed pad) with θJA = 50°C/W and θJC = 10°C/W on a 4-layer PCB per JESD51-7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external Schottky diode; high dv/dt node requiring short trace routing and local ceramic bypassing to minimize EMI. |
| 2 EN | Enable Input | Positive-logic control pin; internal 1µA pull-up enables chip when floating; 1.5V rising threshold ensures noise immunity. |
| 3 COMP | Compensation Node | Error amplifier output; connects to RC network for loop stability; clamped 0.9–2.0V to prevent saturation during transients. |
| 4 FB | Feedback Input | Senses output voltage via resistive divider; 20µA bias current requires R2 ≤40kΩ to avoid voltage error. |
| 5 GND | Ground / Exposed Pad | Primary return path for high-switching current; exposed pad must be soldered to large PCB ground plane for thermal and EMI performance. |
| 6 FREQ | Frequency Programming | Connects to ground via resistor (e.g., 100kΩ → 250kHz); sets oscillator timing without external clock source. |
| 7 VIN | Input Supply | Powers internal regulator and high-side driver; requires local 10µF ceramic capacitor to suppress switching noise. |
| 8 BST | Bootstrap Supply | Charges external capacitor (BST–SW) to ~5V; insufficient VIN–VOUT headroom causes gate drive failure and dropout. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Soft-Start | 1.5ms ramp time prevents output overshoot during power-up, eliminating need for external sequencing circuitry. |
| Ceramic Capacitor Stable | Supports low-ESR ceramic output capacitors without phase-margin degradation-reducing BOM cost and board space vs. tantalum. |
| Programmable Frequency | Single external resistor adjusts switching frequency across 50–400kHz, enabling optimization for efficiency (low f) or size (high f). |
| No External Current Sense Resistor | Integrated current limit eliminates sense resistor power loss and layout sensitivity, improving accuracy and thermal performance. |
| Pulse Skipping at Light Load | Reduces switching and gate-drive losses below ~200mA load, maintaining >85% efficiency down to 10mA output current. |
Applications
| Automotive Infotainment Power | Industrial 24V Distributed Supply |
|---|---|
Use Scenario: Powering display controllers, audio codecs, and CAN interface ICs in vehicle head units with 12V battery input. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator providing regulated rail with <100mV load transient deviation. Use Value: 28V absolute max rating withstands automotive load-dump spikes; 115µA quiescent current meets ISO 16750-2 sleep-mode requirements. | Use Scenario: Generating 5V/12V rails from 24V factory automation PLC backplane for I/O modules and fieldbus transceivers. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with programmable frequency to avoid EMI coupling into analog sensor circuits. Use Value: 4.5–28V input range accepts wide industrial supply tolerances; SOIC8E exposed pad enables conduction cooling on metal chassis. |
| Battery-Powered Test Equipment | Telecom Remote Radio Unit (RRU) |
Use Scenario: Portable multimeter or oscilloscope front-end powered by two Li-ion cells (6–8.4V) requiring stable 3.3V MCU supply. IC Role / Device Role / Timing Role: Step-down regulator operating in pulse-skipping mode during standby to extend battery runtime. Use Value: 115µA quiescent current enables >18 months of shelf life on 2000mAh battery; internal soft-start prevents measurement offset during wake-up. | Use Scenario: Providing 5V bias for GaN PA drivers and 3.3V for FPGA configuration in outdoor 4G/5G small cell base stations. IC Role / Device Role / Timing Role: High-voltage input buck stage converting -48V telecom supply (via intermediate 24V) to logic rails. Use Value: 28V max input supports 24V intermediate bus with margin; thermal shutdown protects against enclosure overheating in sealed enclosures. |
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, 2.5–18V input, 500kHz max frequency, 25µA IQ. | Replaces MP1586 in new designs; eliminates external Schottky diode; supports higher efficiency in compact layouts. | Select MP2338 for new designs requiring lower IQ, higher current, or synchronous operation; verify PCB footprint compatibility (QFN-10 vs SOIC8E). |
| LM2678SD-5.0/NOPB | Non-synchronous 5A buck; 8–40V input; fixed 5V output; 52kHz switching; 50µA IQ; TO-263-5 package. | Fixed-output variant; higher input voltage ceiling; larger thermal footprint; no frequency programming. | Choose LM2678 only if 5V fixed output suffices and board space allows TO-263; not suitable for adjustable VOUT or compact SOIC layouts. |
Compared with MP1586EN-LF-Z, MP2338DJ-LF-Z delivers higher efficiency and integration at the cost of revised layout and control loop compensation, while LM2678SD-5.0/NOPB offers rugged high-input-voltage operation but lacks programmability and modern low-IQ performance.
Availability
MP1586EN-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment power, industrial 24V distributed supplies, and battery-powered test equipment requiring stable component supply despite end-of-life status.
Supply support for MP1586EN-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, with design centers in the US, China, and Taiwan.
The MP1586 belongs to MPS's legacy high-voltage buck converter product line, engineered for robust operation in automotive and industrial environments where wide input range and thermal resilience are critical.
FAQ
Is MP1586EN-LF-Z still in active production?
No-MP1586EN-LF-Z is officially marked End-of-Life (EOL) by Monolithic Power Systems. The datasheet explicitly states "END OF LIFE, REFER TO MP2338". Aetrix Electronics maintains limited legacy stock for last-time buy and design continuity, but new designs should migrate to MP2338DJ-LF-Z.
What is the minimum input voltage required for reliable startup?
The MP1586EN-LF-Z requires VIN ≥ 3.0V to exit under-voltage lockout (UVLO) and begin regulation. Below 2.6V, the device remains disabled. Startup is guaranteed above 3.0V with EN high, and the internal 2.6V regulator powers all circuitry once VIN exceeds 3.0V.
Can I replace the external Schottky diode with a MOSFET for synchronous rectification?
No-the MP1586EN-LF-Z is a non-synchronous controller with only a high-side MOSFET. It lacks the low-side gate driver and timing logic required for synchronous operation. Attempting external MOSFET replacement will cause shoot-through or unregulated output. Use MP2338 for synchronous capability.
Why does the BST capacitor discharge under high duty cycle?
During high duty cycle (VOUT/VIN >65%), the SW node spends extended time near VIN, reducing the voltage difference (VIN – SW) needed to charge the BST capacitor via the internal PMOS. This leads to insufficient bootstrap voltage and high-side MOSFET turn-off. An external bootstrap diode (e.g., BAT54) is recommended to maintain gate drive.
What is the maximum allowable output voltage I can set with MP1586EN-LF-Z?
The MP1586EN-LF-Z supports output voltages up to 25V, constrained by the absolute maximum rating of the FB pin (6V) and internal 0.8V reference. Using standard resistor dividers, VOUT = 0.8 × (1 + R1/R2); for safety, keep R1 ≤ 1.2MΩ to limit divider current and ensure FB bias accuracy.
How does frequency foldback improve startup reliability?
During startup, frequency foldback reduces switching frequency when inductor current approaches the current limit, preventing current runaway and excessive inductor saturation. This avoids thermal stress and output overshoot before the feedback loop stabilizes-critical for high-VIN, high-inductance applications.
Does MP1586EN-LF-Z support remote sensing of output voltage?
No-it lacks dedicated remote sense pins (e.g., VOSNS, SENSE+/-). Feedback is taken directly from the FB pin connected to the output rail. For precision regulation under high-current conditions, place the FB divider close to the load and use Kelvin traces to minimize IR drop error.
MP1586EN-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:
- 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-Z FAQ
1.How can I place an order for MP1586EN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1586EN-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 MP1586EN-LF-Z reliable?
The price and inventory of MP1586EN-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 MP1586EN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1586EN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1586EN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1586EN-LF-Z?
MP1586EN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1586EN-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 MP1586EN-LF-Z?
For technical support, including MP1586EN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1586EN-LF-Z requirements.
6.How does Aetrix verify that MP1586EN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1586EN-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 MP1586EN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1586EN-LF-Z?
All MP1586EN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1586EN-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 MP1586EN-LF-Z part is unused and in its original packaging.
Return procedure for MP1586EN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP1586EN-LF-Z 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…
