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Texas Instruments LM2586SX-5.0/NOPB
- Part No.:
- LM2586SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-5.0/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
LM2586SX-5.0/NOPB from Texas Instruments is a monolithic 3-A step-up (boost) and flyback switching regulator IC with fixed 5.0 V output, 4 V to 40 V input range, internal 3-A NPN switch rated for 65 V off-state voltage, current-mode control, and adjustable 100–200 kHz switching frequency - used in industrial power supplies requiring high-voltage DC-DC conversion with ±4% system output tolerance.
For engineers reviewing the LM2586SX-5.0/NOPB datasheet, LM2586SX-5.0/NOPB pinout, LM2586SX-5.0/NOPB application, or LM2586SX-5.0/NOPB equivalent, key selection considerations include input voltage range compatibility, external shutdown capability, thermal performance in TO-263-7 package, oscillator synchronization support, and current-limit protection for flyback/boost topologies.
Technical Context
The LM2586SX-5.0/NOPB implements current-mode control architecture with an internal error amplifier (transconductance = 0.75 mmho typ), 1.23 V reference (for fixed 5 V version, VREF = 5.0 V at feedback pin), and cycle-by-cycle current limiting. Its oscillator supports both resistor-programmed (100–200 kHz) and external synchronization via pin 6.
It integrates undervoltage lockout (3.3 V threshold), thermal shutdown, soft-start (11 μA soft-start current), and output transistor protection. The device operates in flyback, boost, or forward converter configurations - not as a linear regulator or buck controller - and requires external diode, inductor, and output capacitor for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over line/load/temperature - ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial, automotive battery, and telecom applications including 12 V and 24 V nominal systems. |
| Switch Current | 3 A peak - enables up to ~1.1 A continuous output current in boost mode (with external current limiting); internally limited in flyback mode. |
| Switch Off-State Voltage | 65 V - allows safe operation with reflected voltages up to 65 V across primary winding in flyback designs. |
| Switching Frequency | 100–200 kHz (adjustable via resistor or sync pin) - balances efficiency, magnetics size, and EMI filtering requirements. |
| Shutdown Current | <60 μA - reduces system standby power when externally disabled via ON/OFF pin (pin 1). |
| Thermal Shutdown | 150°C junction temperature - protects against thermal runaway during overload or poor heatsinking conditions. |
Pinout & Package
LM2586SX-5.0/NOPB is housed in a thermally enhanced DDPAK/TO-263-7 (KTW) package (14.986 mm × 10.16 mm), with exposed drain pad for PCB thermal conduction. Pin numbering follows standard top-view layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FREQ/ON-OFF | Frequency adjust / shutdown control | Resistor-to-ground sets switching frequency (100–200 kHz); ≥3 V applied disables regulator and reduces supply current to <60 μA. |
| 2 - GND | Power ground | Common return for internal circuits and external components; must be low-impedance connection to minimize noise and thermal resistance. |
| 3 - OUTPUT | Switch collector output | Drives external inductor or transformer primary; connects to NPN switch collector - not a regulated output node. |
| 4 - FEEDBACK | Voltage sense input | Monitors regulated output via resistive divider; for fixed 5 V version, internal divider sets 5.0 V output without external resistors. |
| 5 - COMP | Error amplifier output | Provides compensation network connection point; transconductance = 0.75 mmho typ - used to stabilize loop response. |
| 6 - SYNC | External clock synchronization | Accepts negative-going pulses to align switching edge with external clock - eliminates beat frequencies in multi-rail systems. |
| 7 - VIN | Input supply | Primary DC input (4–40 V); powers internal bias circuits and switch base drive - requires local ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response, inherent cycle-by-cycle current limiting, and simplified loop compensation vs. voltage-mode control. |
| Internal 3-A NPN switch | Eliminates need for external high-current transistor - reduces BOM count and layout complexity in flyback/boost designs. |
| Adjustable switching frequency | Allows optimization of magnetic size, efficiency, and EMI profile using single external resistor (e.g., 22 kΩ → 200 kHz). |
| External synchronization | Supports deterministic timing alignment across multiple converters - critical for noise-sensitive instrumentation and multi-rail power systems. |
| Soft-start function | Reduces inrush current during startup by gradually increasing peak switch current - prevents input rail sag and output overshoot. |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
Use Scenario: Isolated 5 V/1 A output from 12–24 V battery bus in PLC I/O module with reinforced insulation requirements. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with transformer isolation, current-mode regulation, and 100 kHz switching. Use Value: Achieves ±4% output tolerance across temperature and load while meeting IEC 61000-4-5 surge immunity via robust 65 V switch rating. | Use Scenario: Generating stable 5 V rail for infotainment MCU from variable 9–16 V automotive battery under cold-crank conditions. IC Role / Device Role / Timing Role: Step-up (boost) regulator with wide 4–40 V input range, enabling operation down to 4 V during cranking. Use Value: Delivers regulated 5 V output without external feedback resistors and maintains regulation even at 9 V input with >75% efficiency. |
| Multiplexed Output Flyback | Programmable Lab Power Supply |
Use Scenario: Dual-output (5 V + 12 V) isolated flyback supply for test equipment requiring independent, tightly regulated rails. IC Role / Device Role / Timing Role: Single-controller flyback with auxiliary winding sensing - uses fixed 5 V output as main rail and secondary winding for 12 V. Use Value: Reduces component count vs. dual-controller solution; leverages internal 5 V reference and current-mode stability for cross-regulation. | Use Scenario: Adjustable bench supply where 5 V output serves as reference for DAC-controlled higher-voltage outputs. IC Role / Device Role / Timing Role: Fixed 5 V precision reference generator with low drift (±4% system tolerance) and low-noise operation. Use Value: Provides clean, stable 5 V reference unaffected by load transients due to current-mode control and soft-start behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2586T-5.0/NOPB | Same electrical specs, but in TO-220-7 (NDZ) package - higher θJA (65°C/W vs. 56°C/W), no exposed thermal pad. | Suitable for lower-power or cost-sensitive designs where heatsink mounting is feasible; less efficient thermal dissipation than KTW. | Select LM2586T-5.0/NOPB only if board space permits vertical TO-220 mounting and thermal budget allows higher junction rise. |
| LM2577-5.0 | Lower 3-A switch rating, fixed 5 V output, no sync pin, 50–100 kHz range - lacks frequency synchronization and has narrower VIN range (3.5–40 V). | Applicable in simpler, non-synchronized boost designs where EMI constraints allow lower frequency operation. | Choose LM2577-5.0 only when synchronization, 200 kHz operation, or tighter line regulation (±4% vs. ±5%) are not required. |
Compared with LM2586T-5.0/NOPB, the LM2586SX-5.0/NOPB offers superior thermal performance and PCB-mount reliability via its DDPAK thermal pad; versus LM2577-5.0, it adds synchronization, wider frequency tuning, and improved system tolerance - making it preferable for noise-sensitive or multi-converter systems.
Availability
LM2586SX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body electronics, test equipment DC-DC stages, and isolated communication interface supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2586SX-5.0/NOPB 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability industrial and automotive power solutions.
The LM2586 product line was designed for cost-effective, wide-input flyback and boost converter applications - targeting engineers needing integrated 3-A switch controllers with minimal external components and robust protection features.
FAQ
What is the maximum input voltage supported by the LM2586SX-5.0/NOPB?
The LM2586SX-5.0/NOPB supports a maximum input voltage of 40 V under recommended operating conditions, with absolute maximum rating of 45 V. Exceeding 40 V may compromise reliability or trigger undervoltage lockout behavior outside specified limits. This makes the LM2586SX-5.0/NOPB suitable for 24 V industrial systems and automotive applications with transient spikes.
Does the LM2586SX-5.0/NOPB require external feedback resistors to set the 5 V output?
No, the LM2586SX-5.0/NOPB has an internally trimmed 5.0 V output configuration - the feedback divider is integrated, so no external resistors are needed to achieve nominal 5 V output. This simplifies design, improves accuracy (±4% system tolerance), and eliminates resistor drift effects that would otherwise impact long-term stability.
Can the LM2586SX-5.0/NOPB be synchronized to an external clock signal?
Yes, the LM2586SX-5.0/NOPB supports external synchronization via pin 6 (SYNC). A negative-going pulse applied to this pin forces the internal oscillator to align its switching edge, enabling deterministic timing across multiple converters. This feature is confirmed in the datasheet's Figure 24 and Section 7.3.6, and is unique to the LM2586 family versus older regulators like LM2577.
What thermal performance can be expected from the LM2586SX-5.0/NOPB in its DDPAK package?
The LM2586SX-5.0/NOPB in DDPAK/TO-263-7 (KTW) package achieves a junction-to-ambient thermal resistance (RθJA) of 56°C/W with 0.136 in² copper area, improving to 35°C/W with 0.4896 in² and 26°C/W with 1.0064 in². Its exposed drain pad must be soldered to a thermal plane for optimal performance - critical for sustaining 3 A switch current at elevated ambient temperatures.
How does the LM2586SX-5.0/NOPB protect against overcurrent conditions?
The LM2586SX-5.0/NOPB provides cycle-by-cycle current limiting via its current-mode control architecture, combined with internal thermal shutdown and undervoltage lockout. The NPN switch current limit is 4.0 A typical (3.0–7.0 A min/max), and protection activates before damage occurs - verified per Electrical Characteristics Table 6.8 (ICL parameter). External output current limiting remains necessary in boost mode per datasheet Note 3.
LM2586SX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A (Switch)
- Frequency - Switching:
- 100kHz ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2586SX-5.0/NOPB FAQ
1.How can I place an order for LM2586SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-5.0/NOPB 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 LM2586SX-5.0/NOPB reliable?
The price and inventory of LM2586SX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2586SX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2586SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-5.0/NOPB?
LM2586SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-5.0/NOPB 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 LM2586SX-5.0/NOPB?
For technical support, including LM2586SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2586SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2586SX-5.0/NOPB 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 LM2586SX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2586SX-5.0/NOPB?
All LM2586SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-5.0/NOPB, 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 LM2586SX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2586SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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