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Texas Instruments LM2586T-5.0
- Part No.:
- LM2586T-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2586T-5.0.pdf
- Description:
- IC REG BST FLYBACK 5V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,552
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Product details
Overview
LM2586T-5.0 from Texas Instruments is a monolithic 3A flyback/boost/forward switching regulator IC with fixed 5.0V output, 4V–40V input range, NPN 3.0A/65V switch, ±4% system output voltage tolerance, and adjustable 100–200 kHz switching frequency. It enables compact isolated power supplies in industrial control and telecom infrastructure.
For engineers reviewing the LM2586T-5.0 datasheet, LM2586T-5.0 pinout, LM2586T-5.0 application, or LM2586T-5.0 equivalent, key selection criteria include its integrated soft-start, current-mode control for transient response, shutdown capability drawing <60 μA, thermal/UVLO protection, and TO-220 (T) package suitability for medium-power offline and DC-DC conversion.
Technical Context
The LM2586T-5.0 implements current-mode PWM control with an internal 3.0A NPN power switch rated for 65V standoff, enabling flyback topologies with inherent isolation and multiple-output capability. Its error amplifier features 5.0V reference (±0.2V over temp), 0.75 mmho transconductance, and 165 V/V gain-optimized for stable loop compensation across line/load variations.
Operating at 100–200 kHz via external resistor or synchronization pin, it supports frequency coordination in multi-rail systems. Protection includes cycle-by-cycle current limit, thermal shutdown, and undervoltage lockout at 3.3V (±0.25V), ensuring robust operation under fault conditions without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over line/load/temperature - guarantees stable logic supply without external feedback resistors. |
| Input Voltage Range | 4V to 40V - supports wide-input industrial and automotive battery-fed applications including 12V/24V nominal systems. |
| Switch Rating | NPN transistor, 3.0A peak, 65V breakdown - enables flyback designs up to ~30W with standard off-the-shelf transformers. |
| Switching Frequency | Adjustable 100–200 kHz - allows trade-off between magnetics size and efficiency; higher frequencies reduce transformer volume but increase switching loss. |
| Shutdown Current | <60 μA - minimizes standby power in always-on systems such as remote sensors or IoT gateways. |
| Reference Voltage | 5.0V ±0.088V (min/max) at feedback pin - defines regulation accuracy and sets tolerance budget for output capacitor ESR and PCB trace resistance. |
| Thermal Resistance | θJA = 65°C/W (TO-220, no heatsink); θJC = 2°C/W - enables thermal design with minimal copper or optional heatsink for continuous 2–3W dissipation. |
Pinout & Package
LM2586T-5.0 uses a 7-lead TO-220 (T) package with bent, staggered leads and exposed tab electrically connected to Pin 2 (Ground). The tab serves as primary thermal path and must be mounted to heatsink or large copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Freq. Adj./ON-OFF) | Frequency adjustment and shutdown control | Resistor-to-ground sets oscillator frequency; ≥3V applied shuts down device, reducing supply current to <60 μA. |
| 2 (GND) | Power and signal ground reference | Common return for internal circuits, switch emitter, and thermal tab - requires low-impedance connection to minimize noise and thermal resistance. |
| 3 (VIN) | Main input supply connection | Accepts 4–40V DC; bypassed externally with 100μF + 0.1μF capacitors to suppress ripple and high-frequency noise. |
| 4 (SW) | Collector of internal NPN switch | Drives transformer primary or boost inductor; voltage swings up to 65V - requires snubber and fast recovery diode in flyback/boost configurations. |
| 5 (COMP) | Error amplifier output | Provides compensation node for Type II/III network; drives external RC network to stabilize feedback loop against load/transient variations. |
| 6 (FB) | Feedback input | Monitors regulated output via resistive divider; compares to internal 5.0V reference to adjust duty cycle - no external resistor needed for fixed-5V version. |
| 7 (VREF) | Internal reference output | Provides 5.0V reference for external circuitry (e.g., ADC bias, sensor excitation); sourced at up to 10mA with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Reduces inrush current during startup by gradually ramping peak switch current - prevents input rail sag and fuse tripping in battery-powered systems. |
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting - eliminates need for external current-sense resistor in most flyback designs. |
| External shutdown | Logic-level compatible ON/OFF pin draws only 40 μA when active - allows microcontroller or PMIC to globally disable power stage with minimal overhead. |
| Family of standard magnetics | Validated compatibility with Coilcraft, Pulse, Renco, and Schott transformers (e.g., T7, T6) - accelerates design cycle and reduces qualification risk for flyback implementations. |
| Protection suite | Combines current limit, thermal shutdown, and undervoltage lockout - ensures safe operation during overload, overtemperature, or brownout without external supervision circuitry. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
Use Scenario: Isolated 5V rail generation from 24V DC bus in programmable logic controller backplane. IC Role / Device Role / Timing Role: Flyback controller providing galvanic isolation, regulation, and fault protection for I/O module logic and analog front-end. Use Value: Delivers ±4% output stability across -40°C to +85°C ambient and handles 1.1A load with <60 μA shutdown current - extends system uptime and simplifies thermal management. | Use Scenario: Local 5V bias supply for Ethernet PHY and management MCU on carrier-grade line cards. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller enabling compact, low-noise auxiliary power with synchronized switching to avoid EMI conflicts. Use Value: Adjustable 100–200 kHz frequency allows EMI filtering optimization; current-mode control maintains regulation during burst-mode traffic-induced load transients. |
| Automotive Body Control Module | Medical Sensor Interface |
Use Scenario: Non-isolated boost converter generating 5V from 9–16V vehicle battery for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Step-up regulator with integrated switch and UVLO - monitors battery voltage and disables output below 3.3V to prevent brownout reset. Use Value: Wide 4–40V input range accommodates cold-crank (6.5V) and load-dump (40V) events; 3A switch supports peak loads from solenoid drivers. | Use Scenario: Low-noise, isolated 5V supply for precision analog front-end in portable diagnostic equipment. IC Role / Device Role / Timing Role: Flyback controller driving miniature transformer to separate patient-connected circuits from main logic ground. Use Value: Internal soft-start prevents output overshoot during power-on; ±4% tolerance meets IEC 60601-1 requirements for auxiliary power accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587T-5.0 | Same pinout, identical electrical specs, but optimized for forward converter topology with different internal compensation. | Lacks flyback-specific transformer drive timing; not validated for multi-output flyback designs per TI documentation. | Select LM2586T-5.0 for flyback/isolation; LM2587T-5.0 only if forward topology is confirmed. |
| UC3844BD1R2G | Current-mode PWM controller (no integrated switch); requires external MOSFET; 1A max gate drive; fixed 250 kHz oscillator. | Supports higher voltage/current with discrete FET but adds BOM cost, layout complexity, and external protection components. | Choose UC3844BD1R2G only when >3A output or >65V standoff is required beyond LM2586T-5.0 capability. |
Compared with LM2586T-5.0, LM2587T-5.0 offers identical packaging and pinout but diverges in internal compensation for forward converters, while UC3844BD1R2G provides greater flexibility at the cost of added external components and design effort - making LM2586T-5.0 optimal for cost-sensitive, medium-power flyback applications requiring minimal external parts.
Availability
LM2586T-5.0 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive body electronics requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2586T-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 emphasis on reliability, longevity, and application-specific integration.
The LM2586 series was designed specifically for cost-effective, low-component-count flyback, boost, and forward converter power supplies targeting industrial, telecom, and automotive subsystems where isolation, wide input range, and integrated protection are critical.
FAQ
What is the maximum output current achievable with LM2586T-5.0 in a flyback configuration?
The LM2586T-5.0 supports up to 1.1A output current in flyback mode as specified in its Electrical Characteristics table under LM2586-5.0 conditions (VIN = 4V–12V, TJ = 25°C). This limit arises from internal current limiting and thermal constraints of the 3.0A NPN switch - exceeding 1.1A risks thermal shutdown unless heatsinking and transformer derating are applied.
Does LM2586T-5.0 require external feedback resistors to regulate at 5.0V?
No, LM2586T-5.0 does not require external feedback resistors. It integrates a precise 5.0V reference internally connected to the FB pin, enabling fixed 5.0V output without external divider components - reducing BOM count and improving regulation accuracy compared to adjustable versions like LM2586-ADJ.
Can LM2586T-5.0 synchronize its switching frequency with other regulators?
Yes, LM2586T-5.0 supports frequency synchronization via its Sync pin (Pin 1 when configured with external resistor). Applying an external clock signal within 200 kHz range and meeting threshold voltage (0.75V min) allows multiple LM2586T-5.0 devices to operate at identical switching frequencies - reducing beat frequencies and simplifying EMI filter design in multi-rail systems.
What thermal considerations apply to LM2586T-5.0 in TO-220 (T) package?
LM2586T-5.0 in TO-220 (T) package has θJA = 65°C/W with minimal copper and θJC = 2°C/W to case. For continuous operation at full 1.1A load, junction temperature must stay ≤125°C. With 25°C ambient, max allowable power dissipation is ~1.5W - requiring either adequate PCB copper area or an external heatsink to maintain safe thermal margin.
How does the shutdown function of LM2586T-5.0 interact with the frequency adjustment pin?
The LM2586T-5.0 combines shutdown and frequency adjustment on Pin 1: applying ≥3V shuts down the device (<60 μA quiescent), while a resistor to ground (e.g., 22 kΩ for 200 kHz) sets operating frequency. TI's Figure 38 shows use of an isolation diode to enable both functions - allowing microcontroller-driven shutdown without disrupting frequency programming.
LM2586T-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2586T-5.0 FAQ
1.How can I place an order for LM2586T-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586T-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 LM2586T-5.0 reliable?
The price and inventory of LM2586T-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 LM2586T-5.0 is usually 5 days.
3.What payment methods are accepted for LM2586T-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586T-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586T-5.0?
LM2586T-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586T-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 LM2586T-5.0?
For technical support, including LM2586T-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586T-5.0 requirements.
6.How does Aetrix verify that LM2586T-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2586T-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 LM2586T-5.0 meets industry standards.
7.What is the process for return or replacement of LM2586T-5.0?
All LM2586T-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2586T-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 LM2586T-5.0 part is unused and in its original packaging.
Return procedure for LM2586T-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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