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Texas Instruments LM2586S-5.0
- Part No.:
- LM2586S-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586S-5.0.pdf
- Description:
- IC REG BOOST FLYBACK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,639
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Product details
Overview
LM2586S-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 interface modules.
For engineers reviewing the LM2586S-5.0 datasheet, LM2586S-5.0 pinout, LM2586S-5.0 application, or LM2586S-5.0 equivalent, key selection criteria include its integrated soft-start, current-mode control for transient immunity, external shutdown capability, thermal/UVLO protection, and compatibility with standard flyback transformers (e.g., Schott 67141450, Renco RL-5751) per TI Application Note SNVS121C.
Technical Context
The LM2586S-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-programmed frequency (100–200 kHz) or synchronization via the SYNC pin, enabling multi-device phase alignment without external clock generators.
Protection architecture includes cycle-by-cycle current limiting, undervoltage lockout (3.05–3.75V), thermal shutdown (>150°C junction), and soft-start (11 μA soft-start current). The device operates across −40°C to +125°C junction temperature and draws <60 μA in shutdown mode - critical for low-power standby systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over line/load/temperature - guarantees stable logic rail generation without external feedback resistors. |
| Input Voltage Range | 4V to 40V - supports wide-range industrial inputs including 12V/24V nominal buses with brownout margin. |
| Switch Rating | NPN transistor, 3.0A peak current, 65V VCEO - enables direct drive of flyback primaries up to 24W with minimal external components. |
| Switching Frequency | Adjustable 100–200 kHz - allows optimization of transformer size and EMI filtering; synchronized operation supported. |
| Efficiency | 80% at 12VIN, 0.6A load - reflects real-world boost/flyback performance with standard diodes (1N5820) and electrolytic output caps. |
| Shutdown Current | <60 μA - enables ultra-low quiescent power in battery-backed or energy-harvesting applications. |
| Thermal Resistance | θJA = 35°C/W (TO-263 package, 0.4896 in² copper) - defines heatsink requirements for continuous 3A operation at 70°C ambient. |
Pinout & Package
LM2586S-5.0 uses a 7-lead TO-263 (S) surface-mount package with exposed thermal pad - optimized for high-current power delivery and PCB heat spreading. Pin numbering follows TI standard top-view orientation (pin 1 = Freq Adj./ON-OFF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Frequency Adjust / ON-OFF Control | Resistor-to-ground sets switching frequency; ≥3V applied shuts down IC - dual-function pin requires isolation diode for clean shutdown control. |
| 2 | Ground | Power ground reference for internal circuits and switch emitter - must connect directly to low-impedance PCB ground plane. |
| 3 | Feedback | Monitors output via resistive divider; compares to 5.0V internal reference - not used in fixed-output LM2586S-5.0 (internally tied). |
| 4 | Compensation | Error amplifier output - connects to RC network for loop stability; transconductance = 0.75 mmho typical. |
| 5 | Sync | Accepts external clock signal (0.625–1.00V threshold) to synchronize switching frequency with other regulators. |
| 6 | Switch | Collector of internal NPN transistor - drives primary winding of flyback transformer or boost inductor. |
| 7 | Input Voltage | Main supply input (4–40V) - requires local 100μF + 0.1μF decoupling per TI layout guidelines. |
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 amplifiers in flyback designs. |
| Integrated soft-start | 11 μA soft-start current ramps output voltage gradually - prevents inrush into large output capacitors and avoids input bus droop. |
| Thermal + UVLO + current protection | Single-chip protection stack ensures robust operation under overload, cold start, or high-ambient conditions without external circuitry. |
| External frequency sync | Allows precise timing coordination across multiple LM2586S-5.0 units - essential for noise-sensitive applications like data acquisition front-ends. |
| Standard transformer compatibility | Validated with Schott T7, Renco RL-5751, and Coilcraft S6000-A - reduces design risk and accelerates qualification for medical/industrial isolation. |
Applications
| Industrial PLC Power Supply | Telecom Line Interface Card |
|---|---|
Use Scenario: Isolated 5V rail generation from 24V backplane in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 5V output with galvanic separation for sensor/actuator interfaces. Use Value: Eliminates need for optocoupler-based feedback; ±4% output tolerance ensures reliable microcontroller and ADC operation across temperature. |
Use Scenario: Boosting 3.3V logic supply to 5V for RS-232/RS-485 transceivers on telecom line cards. IC Role / Device Role / Timing Role: Step-up (boost) regulator providing regulated 5V from low-voltage logic rails with minimal BOM count. Use Value: 80% efficiency at 0.6A enables compact layout; shutdown pin allows dynamic power gating during link idle states. |
| Medical Patient Monitor Auxiliary Supply | Automotive Body Control Module |
Use Scenario: Generating isolated 5V for analog front-end sensors in Class II medical devices requiring reinforced insulation. IC Role / Device Role / Timing Role: Flyback controller driving Schott 67141450 transformer to meet IEC 60601 creepage/clearance requirements. Use Value: Internal 65V switch rating and thermal shutdown support safe operation during fault conditions per medical safety standards. |
Use Scenario: On-board 5V supply from 9–16V battery input in body control units powering CAN transceivers and microcontrollers. IC Role / Device Role / Timing Role: Input-flexible buck-derived flyback regulator handling cold-crank (4V) and load-dump (40V) transients. Use Value: 4V–40V input range and UVLO (3.05–3.75V) ensure uninterrupted operation during automotive battery fluctuations. |
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 electrical specs; packaged in 7-lead TO-220 (T) with vertical leadform - θJA = 45°C/W (4 in² copper) vs. 35°C/W for S-package. | Requires through-hole mounting and larger heatsink area; less suitable for high-density SMT layouts. | Select LM2586T-5.0 only when mechanical constraints favor TO-220 or legacy board compatibility is required. |
| UC3844BD1R2G | Current-mode PWM controller (not integrated switch); requires external MOSFET; fixed 250 kHz oscillator; no built-in soft-start or shutdown pin. | Supports higher power (>50W) but increases component count, layout complexity, and design validation effort. | Choose UC3844BD1R2G only when >3A output current or custom topology (e.g., active clamp forward) is needed - not a drop-in replacement. |
Compared with LM2586T-5.0, the LM2586S-5.0 offers superior thermal performance in SMT layouts; versus UC3844BD1R2G, it delivers faster time-to-market for ≤24W isolated supplies by integrating the power switch and protection functions.
Availability
LM2586S-5.0 is available at Aetrix Electronics and suitable for industrial PLC power supplies, telecom line interface cards, medical auxiliary supplies, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for LM2586S-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 specializing in analog and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and communications markets.
The LM2586S-5.0 belongs to TI's SIMPLE SWITCHER® family - designed specifically for cost-sensitive, high-reliability flyback, boost, and forward converter applications where minimal external components and proven transformer compatibility are critical.
FAQ
What is the maximum output power achievable with LM2586S-5.0 in a flyback configuration?
The LM2586S-5.0 supports up to ~24W output in flyback topology using standard transformers like Schott 67141450, constrained by its 3.0A switch current limit and 65V standoff. At 12V input and 5V/1.1A output (per datasheet), efficiency reaches 80%, confirming practical power delivery within thermal limits of the TO-263 package when properly heatsinked.
Does LM2586S-5.0 require external feedback resistors for regulation?
No - the LM2586S-5.0 integrates a precision 5.0V reference and internal feedback connection; external resistors are unnecessary. Unlike the adjustable LM2586-ADJ version, the -5.0 variant routes the feedback node internally to achieve fixed 5.0V output with guaranteed ±4% tolerance across line, load, and temperature.
Can LM2586S-5.0 be synchronized to an external clock signal?
Yes - the SYNC pin (Pin 5) accepts TTL/CMOS-compatible clock signals with 0.625–1.00V threshold. When driven externally, the LM2586S-5.0 locks its oscillator to the incoming frequency, enabling noise reduction in multi-rail systems and eliminating beat frequencies in dense PCB layouts.
What transformer turns ratio is recommended for LM2586S-5.0 in a 12V-to-5V flyback design?
For 12V input to 5V output, TI recommends the Schott 67141450 (T7) transformer with 1:1 primary-to-secondary turns ratio, validated in Figure 5 of SNVS121C. This configuration delivers 1A output with <50 mV ripple and meets efficiency and regulation specs without custom magnetics.
How does the shutdown function operate on LM2586S-5.0, and what is the quiescent current in that state?
The LM2586S-5.0 enters shutdown when ≥3V is applied to Pin 1 (Freq Adj./ON-OFF), drawing <60 μA total supply current - 16 μA from VIN and 40 μA from the shutdown pin. An isolation diode (e.g., 1N4148) is mandatory to prevent interference with frequency adjustment during active operation.
LM2586S-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:
- Tube
- 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)
LM2586S-5.0 FAQ
1.How can I place an order for LM2586S-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586S-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 LM2586S-5.0 reliable?
The price and inventory of LM2586S-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 LM2586S-5.0 is usually 5 days.
3.What payment methods are accepted for LM2586S-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586S-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586S-5.0?
LM2586S-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586S-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 LM2586S-5.0?
For technical support, including LM2586S-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586S-5.0 requirements.
6.How does Aetrix verify that LM2586S-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2586S-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 LM2586S-5.0 meets industry standards.
7.What is the process for return or replacement of LM2586S-5.0?
All LM2586S-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2586S-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 LM2586S-5.0 part is unused and in its original packaging.
Return procedure for LM2586S-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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