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Texas Instruments LM2586SX-5.0
- Part No.:
- LM2586SX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-5.0.pdf
- Description:
- IC REG BOOST FLYBACK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
LM2586SX-5.0 from Texas Instruments is a monolithic 3A flyback/boost/forward switching regulator IC with fixed 5.0V output, NPN internal switch rated for 65V standoff and 3.0A peak current, ±4% system output voltage tolerance over line and load, 4V–40V input range, and adjustable 100–200 kHz switching frequency - used in isolated DC-DC power supplies for industrial control and telecom infrastructure.
For engineers reviewing the LM2586SX-5.0 datasheet, LM2586SX-5.0 pinout, LM2586SX-5.0 application, or LM2586SX-5.0 equivalent, key selection criteria include its integrated soft-start, current-mode control for transient response, external shutdown capability, thermal/UVLO protection, and compatibility with standard flyback transformers (e.g., Schott 67141450, Renco RL-5751) in TO-263-7 package.
Technical Context
The LM2586SX-5.0 implements current-mode PWM control with an internal 3.0A NPN power switch and error amplifier referenced to a 5.0V internal bandgap (4.913–5.088V over temperature). Its oscillator supports resistor-programmable frequency (100–200 kHz) and synchronization to external clock signals via the SYNC pin.
Protection architecture includes undervoltage lockout (3.05–3.75V), thermal shutdown, cycle-by-cycle current limiting (4.0A typical limit), and soft-start (11.0 μA soft-start current). The device operates across −40°C to +125°C junction temperature and draws ≤15.5 mA quiescent supply current when active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over line/load/temperature - guarantees stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4V to 40V - supports wide-range industrial inputs including 5V, 12V, 24V, and 36V bus systems with margin for transients. |
| Switch Rating | NPN transistor, 3.0A peak, 65V standoff - enables flyback topologies with up to ~36V input and 5V/1.1A output (per datasheet test conditions). |
| Switching Frequency | 100–200 kHz (resistor-adjustable) - balances magnetics size, EMI, and efficiency; sync-capable for multi-rail noise reduction. |
| Efficiency | 80% at VIN = 12V, IOUT = 0.6A - reflects real-world boost/flyback performance with standard external components (e.g., 1N5820 diode, 680μF output cap). |
| Shutdown Current | <60 μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Thermal Resistance | θJA = 26°C/W (TO-263 on 7.4× PCB copper) - defines heatsink-free power handling limit (~2.7W max at ΔT = 70°C). |
Pinout & Package
LM2586SX-5.0 is housed in a 7-lead TO-263 (S) surface-mount package with exposed thermal pad. Pin 1 is FREQ ADJ/ON-OFF, Pin 2 is GROUND, Pin 3 is OUTPUT (SW), Pin 4 is FEEDBACK (FB), Pin 5 is COMPENSATION (COMP), Pin 6 is INPUT (VIN), Pin 7 is VREF (not connected in fixed-output versions per block diagram).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FREQ ADJ / ON-OFF) | Frequency programming & shutdown control | Resistor-to-ground sets switching frequency; ≥3V applied shuts down IC - requires isolation diode for safe control interface. |
| Pin 2 (GND) | Power and signal reference | Common return for VIN, SW, FB, COMP, and SH pins - must be low-impedance connection to minimize noise and thermal resistance. |
| Pin 3 (SW) | Switch node | Drives primary winding of flyback transformer or boost inductor - carries high di/dt; layout critical for EMI and efficiency. |
| Pin 4 (FB) | Feedback input | Monitors output via resistive divider (internal 5.0V ref); open in fixed version - not used externally for LM2586SX-5.0. |
| Pin 5 (COMP) | Error amplifier output | Provides compensation network connection (RC filter) to stabilize loop; drives external RC network for phase margin tuning. |
| Pin 6 (VIN) | Power input | Supplies internal circuitry and bias for NPN switch - requires local 100μF + 0.1μF decoupling per datasheet recommendations. |
| Pin 7 (VREF) | Internal reference output | Not connected in fixed-output variants (LM2586SX-5.0); only used in adjustable version (LM2586SX-ADJ) for external feedback. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting - eliminates need for external current-sense resistor in most designs. |
| Integrated soft-start | 11.0 μA soft-start current ramps output smoothly - prevents inrush into large output capacitors and avoids input supply sag during startup. |
| External shutdown capability | ON/OFF pin accepts ≥3V logic-high to disable switching - reduces total system standby power to <60 μA without external MOSFETs. |
| Thermal & UVLO protection | Shuts down at TJ ≥150°C and restarts after cooldown; disables below VIN = 3.05V - prevents malfunction during brownout or overload conditions. |
| Standard magnetics support | Validated with Schott T7, Renco RL-5751, Coilcraft S6000-A - simplifies BOM sourcing and reduces qualification time for flyback designs. |
Applications
| Industrial AC/DC Power Supplies | Telecom Remote Power Feeds |
|---|---|
Use Scenario: Isolated 5V rail generation from 24V or 48V DC distribution buses in programmable logic controllers and sensor nodes. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 5V output using Schott 67141450 transformer and 1N5820 rectifier. Use Value: Delivers 5.0V ±4% at up to 1.1A with 80% efficiency and no external feedback components - reducing component count and board area. | Use Scenario: Power-over-ethernet (PoE) powered device (PD) auxiliary supply converting midspan 57V DC to isolated 5V for microcontroller and PHY. IC Role / Device Role / Timing Role: Flyback regulator operating at 150 kHz (RSET = 15 kΩ) with synchronized switching to avoid interference with Ethernet data bands. Use Value: Meets EN55022 Class B EMI limits due to controlled dV/dt and frequency sync capability - eliminating need for additional filtering. |
| Automotive Body Control Modules | Medical Diagnostic Equipment |
Use Scenario: 12V vehicle battery to isolated 5V conversion for CAN transceiver and microcontroller in door module ECUs. IC Role / Device Role / Timing Role: Forward converter variant (per datasheet Figure 6 guidance) with external MOSFET drive, leveraging LM2586SX-5.0's current-mode stability. Use Value: Withstands cold-crank (4.5V) and load-dump (40V) events within spec - enabling single-design reuse across 12V and 24V vehicle platforms. | Use Scenario: Isolated auxiliary supply in portable ultrasound units requiring galvanic separation between battery-powered digital section and analog front-end. IC Role / Device Role / Timing Role: Dual-output flyback (Figure 13) using LM2586SX-5.0 for +5V and discrete winding for −12V - meeting IEC 60601 creepage requirements. Use Value: Achieves >5 kVRMS isolation with standard off-the-shelf transformers (e.g., Pulse PE-68414) - accelerating safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2586T-5.0 | Same die, TO-220-7 package (θJA = 45°C/W unheatsinked) - higher thermal resistance, through-hole mounting. | Preferred for prototyping or low-volume assemblies where manual soldering or heatsink attachment is feasible. | Select LM2586T-5.0 if board space allows vertical heatsinking and hand-assembly is acceptable. |
| UCC38C42DG4 | BiCMOS current-mode controller (no integrated switch) - requires external 65V/3A NPN; wider VDD range (10–30V); no soft-start or UVLO built-in. | Suitable for custom magnetics or higher-efficiency discrete designs where layout control and thermal optimization are prioritized. | Choose UCC38C42DG4 only when designing for >85% efficiency or needing programmable slope compensation. |
Compared with LM2586SX-5.0, the TO-220 variant offers easier thermal management but larger footprint, while the UCC38C42DG4 provides greater design flexibility at the cost of increased component count and external protection circuitry.
Availability
LM2586SX-5.0 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical diagnostics requiring stable component supply, long-term lifecycle continuity, and traceable sourcing from authorized channels.
Supply support for LM2586SX-5.0 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 leader delivering analog, embedded processing, and connectivity solutions with focus on reliability, longevity, and industrial-grade performance.
The LM2586 product line was engineered specifically for cost-sensitive, isolated DC-DC conversion in flyback, boost, and forward topologies - targeting applications where integration, protection, and standard magnetics compatibility reduce design risk and time-to-market.
FAQ
What is the maximum output current achievable with LM2586SX-5.0 in a flyback configuration?
The LM2586SX-5.0 supports up to 1.1A output current under specified test conditions (VIN = 4–12V, TJ ≤125°C) in flyback mode, as guaranteed by TI's electrical characteristics table. Output current is internally limited in flyback topology, unlike boost mode where external current limiting is required to protect the 3.0A NPN switch. Thermal design using the TO-263 package's 26°C/W θJA rating determines practical continuous current.
Does LM2586SX-5.0 require external feedback resistors to set the 5.0V output?
No, LM2586SX-5.0 does not require external feedback resistors. It integrates a precision 5.0V reference (4.913–5.088V) and internal resistor divider, so the FB pin is left unconnected in this fixed-output variant. This eliminates resistor tolerance errors and reduces BOM count - confirmed in the block diagram and "LM2586-5.0" electrical characteristics section of the datasheet.
Can LM2586SX-5.0 synchronize its switching frequency to an external clock source?
Yes, LM2586SX-5.0 supports frequency synchronization via its SYNC pin (Pin 6 in TO-263 pinout). When an external TTL/CMOS clock signal (0.625–0.875V threshold) is applied, the internal oscillator locks to that frequency - enabling noise-sensitive multi-rail systems to eliminate beat frequencies. This feature is documented in the "COMMON DEVICE PARAMETERS" table and Figure 38 of the datasheet.
What is the purpose of the VREF pin (Pin 7) on LM2586SX-5.0?
The VREF pin (Pin 7) on LM2586SX-5.0 is not connected internally and serves no function in the fixed 5.0V version. It is reserved for the adjustable variant (LM2586SX-ADJ), where it outputs the 1.230V reference for external feedback networks. TI's block diagram explicitly shows VREF as "NC" for fixed-output versions - confirming it must remain unconnected in LM2586SX-5.0 designs.
How does the shutdown function of LM2586SX-5.0 interact with the frequency adjust pin?
The ON/OFF and FREQ ADJ functions share Pin 1 on LM2586SX-5.0. Applying ≥3V to this pin shuts down the IC, while a resistor to ground sets frequency. TI specifies use of an isolation diode (e.g., 1N4148) between control logic and Pin 1 to prevent interference - ensuring shutdown activation does not disrupt frequency programming. This dual-role pin operation is detailed in Figure 38 and the "SHUTDOWN CONTROL" section of the datasheet.
LM2586SX-5.0 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2586SX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-5.0 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 reliable?
The price and inventory of LM2586SX-5.0 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 is usually 5 days.
3.What payment methods are accepted for LM2586SX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-5.0?
LM2586SX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-5.0 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?
For technical support, including LM2586SX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-5.0 requirements.
6.How does Aetrix verify that LM2586SX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2586SX-5.0 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 meets industry standards.
7.What is the process for return or replacement of LM2586SX-5.0?
All LM2586SX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-5.0, 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 part is unused and in its original packaging.
Return procedure for LM2586SX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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