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Texas Instruments LM2586SX-12
- Part No.:
- LM2586SX-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-12.pdf
- Description:
- IC REG BST FLYBACK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
LM2586SX-12 from Texas Instruments is a monolithic 3A flyback/boost/forward switching regulator IC with fixed 12V 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-12 datasheet, LM2586SX-12 pinout, LM2586SX-12 application, or LM2586SX-12 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 67140900, Renco RL-5533).
Technical Context
The LM2586SX-12 implements current-mode PWM control with an internal 3.0A NPN power switch and error amplifier referenced to a stable 12.0V output voltage (typical VREF = 12.0V, min/max 11.79V/12.24V at TJ = −40°C to +125°C). Its oscillator supports resistor-programmed frequency (100–200 kHz) and synchronization to external clock signals via the SYNC pin.
Protection features include cycle-by-cycle current limiting (ICL = 4.0A typ), thermal shutdown (TJ > 150°C), undervoltage lockout (VUV = 3.30V typ), and soft-start (ISS = 11.0 μA typ). The device draws ≤15.5 mA quiescent supply current when active and <60 μA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0V (±4% system tolerance over full line/load/temp) |
| Input Voltage Range | 4V to 40V - supports wide-range industrial and automotive battery inputs |
| Switch Current Rating | 3.0A peak - enables up to 0.8A output in flyback configuration at 12V |
| Switch Voltage Rating | 65V standoff - sufficient for 48V-input flyback designs with margin |
| Switching Frequency | 100–200 kHz adjustable - balances efficiency vs. magnetics size |
| Efficiency | 93% typical at VIN = 10V, IOUT = 0.6A - high efficiency for mid-power isolation |
| Shutdown Current | <60 μA - enables ultra-low-power standby in battery-backed systems |
Pinout & Package
LM2586SX-12 is housed in a 7-lead TO-263 (S) surface-mount package with exposed thermal pad for enhanced heat dissipation. Thermal resistance θJA ranges from 26°C/W (with 7.4× package copper area) to 56°C/W (minimal copper), enabling operation up to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FREQ/ON-OFF | Frequency adjust / shutdown control | Resistor-to-ground sets fSW (100–200 kHz); ≥3V applied shuts down IC |
| 2 - GND | Power and signal ground reference | Common return for internal circuits and external compensation network |
| 3 - COMP | Error amplifier output | Drives external RC compensation network to stabilize feedback loop |
| 4 - VFB | Feedback input | Monitors output via resistive divider; compares to internal 12.0V reference |
| 5 - VIN | Main power input | Accepts 4–40V DC; powers internal circuitry and switch driver |
| 6 - SW | Switch collector node | Connects to primary winding of flyback transformer or boost inductor |
| 7 - NC | No connect | Internally unused; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response, inherent cycle-by-cycle current limiting, and stable operation across varying input/output conditions |
| Integrated soft-start | Reduces in-rush current during startup by gradually ramping peak switch current (ISS = 11.0 μA typical) |
| External shutdown | ON/OFF pin (Pin 1) accepts ≥3V logic signal to disable switching and reduce supply current to <60 μA |
| Thermal & UVLO protection | Automatically disables switch if junction temperature exceeds 150°C or input drops below 3.30V (typ) |
| Standard magnetics support | Validated with family of off-the-shelf flyback transformers (e.g., Schott 67140900, Renco RL-5533) and inductors |
Applications
| Industrial Isolated Power Supply | Telecom Line Card DC-DC |
|---|---|
Use Scenario: Providing isolated 12V bias for PLC I/O modules operating from 24V or 48V backplane rails. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology, regulating output using optocoupler feedback and internal 12V reference. Use Value: Eliminates need for external pass transistor or discrete PWM controller; achieves ±4% regulation without trimming. |
Use Scenario: Generating isolated 12V for analog front-end circuitry in telecom line cards with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Fixed-output flyback controller with 100–200 kHz programmable frequency to avoid sensitive communication bands. Use Value: Enables compact design using standard Schott 67140900 transformer and meets EN 55022 Class B emissions with minimal filtering. |
| Automotive Body Control Module | Test Equipment Auxiliary Supply |
Use Scenario: Deriving isolated 12V from vehicle battery (9–16V nominal, up to 40V transients) for microcontroller peripherals. IC Role / Device Role / Timing Role: Boost-fallback capable regulator supporting both step-up and flyback topologies depending on input range. Use Value: Withstands load dump transients up to 40V; internal UVLO prevents malfunction during cranking (low-VIN events). |
Use Scenario: On-board auxiliary supply in automated test equipment requiring stable 12V for DUT interface circuitry. IC Role / Device Role / Timing Role: Primary-side controller in forward converter configuration with synchronous rectification. Use Value: Delivers 93% efficiency at 0.6A load, reducing thermal load in densely packed chassis; shutdown pin enables remote power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2586T-12 | Same electrical specs; packaged in 7-lead TO-220 (T) with vertical leadform and higher θJA (65°C/W no heatsink) | Requires through-hole PCB layout and external heatsink for >0.5A loads; less suitable for high-density SMT assemblies | Select LM2586T-12 only when mechanical mounting or thermal testing favors TO-220 form factor |
| UCC38C42DG4 | Current-mode PWM controller IC (no integrated switch); requires external 65V/3A NPN transistor and separate bias supply | Offers greater flexibility in switch selection and layout but increases BOM count and design complexity | Choose UCC38C42DG4 when custom magnetics, higher reliability screening, or discrete switch replacement is required |
Compared with LM2586T-12, LM2586SX-12 provides superior thermal performance in SMT layouts; compared with UCC38C42DG4, it reduces component count and layout risk but sacrifices switch customization and bias supply independence.
Availability
LM2586SX-12 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive body electronics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2586SX-12 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 and high-reliability industrial components.
The LM2586SX-12 belongs to TI's SIMPLE SWITCHER® family - designed specifically for cost-effective, low-component-count isolated and non-isolated DC-DC conversion in harsh environments.
FAQ
What is the maximum output current achievable with LM2586SX-12 in a flyback configuration?
The LM2586SX-12 supports up to 0.8A output current in flyback topology under specified conditions (VIN = 4–10V, TJ ≤ +125°C), as guaranteed by its 3.0A internal NPN switch and thermal design limits. Output current is internally limited in flyback mode, unlike boost configurations where external current limiting is required. Actual achievable current depends on transformer turns ratio, PCB copper area, and ambient temperature - verified in Figure 6 and Table 1 of the LM2586 datasheet.
Does LM2586SX-12 require an external diode on the ON/OFF pin for proper shutdown operation?
Yes, LM2586SX-12 requires an external isolation diode between the ON/OFF pin (Pin 1) and control logic, as shown in Figure 38 of the datasheet. This prevents unintended current injection into the frequency-adjust circuit during shutdown activation. Without the diode, sourcing ≥3V to Pin 1 may cause erratic frequency behavior or incomplete shutdown. The diode ensures clean transition between active and <60 μA shutdown states.
Can LM2586SX-12 be synchronized to an external clock signal?
Yes, LM2586SX-12 supports external synchronization via its SYNC pin (Pin 1, shared with FREQ/ON-OFF). When a TTL-compatible square wave (FSYNC = 200 kHz max) is applied, the internal oscillator locks to the external clock. Threshold voltage is 0.75V (typ), with input current ≤100 μA. This allows precise timing alignment in multi-rail power systems - critical for EMI reduction and deterministic transient response.
What is the recommended transformer for LM2586SX-12 in a single-output 12V flyback design?
The LM2586SX-12 is validated with Schott 67140900 and Renco RL-5533 transformers for single-output 12V flyback applications, as listed in Table 1 and Figure 11 of the datasheet. Both provide 1.2:1 turns ratio, support 4–6V input, deliver up to 0.6A output, and match the LM2586SX-12's 100–200 kHz operating range. These transformers eliminate custom magnetics development and accelerate time-to-test.
How does the LM2586SX-12 handle input voltage transients above 40V?
The LM2586SX-12 has an absolute maximum input rating of 45V, but continuous operation above 40V violates the specified operating range and risks damage. For automotive or industrial applications with load-dump transients (e.g., ISO 7637-2 Pulse 5a), external clamping (TVS diode) or pre-regulation is required. The device's undervoltage lockout (3.30V typ) protects against brownouts but offers no overvoltage protection - system-level safeguards must be implemented externally.
LM2586SX-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2586SX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-12 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-12 reliable?
The price and inventory of LM2586SX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2586SX-12 is usually 5 days.
3.What payment methods are accepted for LM2586SX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-12?
LM2586SX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-12 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-12?
For technical support, including LM2586SX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-12 requirements.
6.How does Aetrix verify that LM2586SX-12 is sourced from the original manufacturer or authorized distributors?
All LM2586SX-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2586SX-12?
All LM2586SX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2586SX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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