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Texas Instruments LM2586T-12/NOPB
- Part No.:
- LM2586T-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2586T-12/NOPB.pdf
- Description:
- IC REG BST FLYBCK 12V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,139
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Product details
Overview
LM2586T-12/NOPB 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 LM2586T-12/NOPB datasheet, LM2586T-12/NOPB pinout, LM2586T-12/NOPB application, or LM2586T-12/NOPB equivalent, key selection considerations include its integrated soft-start, current-mode control for transient response, external shutdown capability, thermal/UVLO protection, and TO-220 (T) package thermal performance with θJA = 65°C/W (no heatsink) or 45°C/W (4 in² copper).
Technical Context
The LM2586T-12/NOPB implements current-mode PWM control with an internal 3.0A NPN power switch and error amplifier referenced to a trimmed 12.0V feedback threshold. Its oscillator supports resistor-programmable frequency (100–200 kHz) and external synchronization, enabling noise-sensitive multi-rail designs.
Protection includes undervoltage lockout (3.30V typical), thermal shutdown, cycle-by-cycle current limiting (4.0A typical limit), and soft-start via internal 11.0 μA current source into the compensation pin - all operating across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0V ±4% over full line/load/temperature - guarantees stable rail for downstream logic or analog circuitry without external feedback divider. |
| Input Voltage Range | 4V to 40V - supports wide-input industrial and automotive battery-supplied systems, including 12V/24V nominal buses with ripple and dropout. |
| Switch Current Rating | 3.0A peak, 65V standoff - enables flyback topologies up to ~15W output with standard off-the-shelf transformers (e.g., T7 series). |
| Switching Frequency | Adjustable 100–200 kHz via external resistor on Pin 1 - allows trade-off between magnetic size (higher f = smaller inductor) and conduction losses (lower f = lower MOSFET/switch stress). |
| Shutdown Current | <60 μA total (16 μA at VIN + 40 μA at ON/OFF pin) - enables ultra-low-power standby in battery-backed systems. |
| Thermal Resistance | θJA = 65°C/W (TO-220, no heatsink); 45°C/W (4 in² copper) - defines minimum PCB copper area or heatsink requirement for 3A continuous operation at 75°C ambient. |
| Reference Voltage | 12.0V at FB pin (min 11.52V, max 12.48V) - sets output accuracy baseline; actual VOUT depends on transformer turns ratio and secondary rectification losses. |
Pinout & Package
LM2586T-12/NOPB uses a 7-lead TO-220 (T) package with bent, staggered leads and exposed tab electrically connected to Pin 2 (Ground). The tab must be thermally coupled to PCB copper for thermal management but isolated from other potentials unless grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Freq Adj / ON-OFF) | Multi-function digital input | Apply ≥3V to shut down IC; connect resistor to GND to set switching frequency (100–200 kHz); isolation diode required for reliable shutdown control. |
| 2 (GND) | Power and signal reference | Common return for internal circuits, switch emitter, and compensation network; connects to exposed tab - critical for thermal and noise performance. |
| 3 (Comp) | Error amplifier output | Drives external RC compensation network to stabilize loop; sources/sinks up to ±260 μA; voltage swing 0.25–2.8V. |
| 4 (FB) | Feedback input | Monitors scaled output voltage; internal 12.0V reference compares against FB voltage to regulate output; requires ≤100 nA bias current. |
| 5 (VIN) | Main supply input | Accepts 4–40V unregulated input; powers internal circuitry and switch base drive; bypass with ≥100 μF + 0.1 μF ceramic near pin. |
| 6 (SW) | Switch collector output | Connects to primary winding of flyback transformer or boost inductor; switches 3.0A peak; withstands 65V reverse voltage. |
| 7 (Sync) | Frequency synchronization input | Accepts external clock (≤200 kHz) to align switching edges; threshold 0.75V typical; sinks 100 μA when active. |
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 flyback designs. |
| Integrated soft-start | 11.0 μA internal current source ramps compensation voltage - prevents inrush current and output overshoot during startup without external components. |
| External shutdown with low IQ | Draws only 60 μA total in shutdown - extends battery life in portable or always-on monitoring equipment. |
| Thermal/UVLO/current protection | Automatically disables switch under overtemperature (150°C), input undervoltage (<3.05V), or overcurrent (>4A) - ensures robust operation in harsh environments. |
| Frequency synchronization | Allows multiple LM2586T-12/NOPB units to operate at identical switching frequencies - reduces beat frequencies and EMI in multi-rail power systems. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
|
Use Scenario: Isolated 12V rail generation from 24V or 48V backplane in programmable logic controller modules. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated 12V output using transformer T7 and Schottky rectifier. Use Value: Delivers 0.8A at ±4% regulation with no optocoupler needed - simplifies certification and improves long-term stability vs. TL431-based solutions. |
Use Scenario: Compact 12V bias supply for analog front-end amplifiers and ADC drivers on telecom line cards. IC Role / Device Role / Timing Role: Boost regulator stepping 5V or 12V board rail to higher 12V output with tight ripple control. Use Value: Achieves 93% efficiency at 0.6A load with <50 mVpp output ripple - meets SNR requirements for 16-bit data acquisition. |
| Medical Sensor Interface | Automotive Body Control Module |
|
Use Scenario: Low-noise, isolated 12V supply for MEMS pressure sensors and signal conditioning in patient monitors. IC Role / Device Role / Timing Role: Flyback controller with synchronized switching to avoid interference with sensitive analog measurement windows. Use Value: Soft-start and current-mode control suppress startup transients that could corrupt sensor calibration sequences. |
Use Scenario: 12V auxiliary rail generation from vehicle battery (9–16V) for microcontroller and CAN transceiver in BCMs. IC Role / Device Role / Timing Role: Forward converter variant using LM2586T-12/NOPB with discrete MOSFET sync rectification. Use Value: UVLO (3.3V) and thermal shutdown ensure fail-safe behavior during cold-crank or engine-off conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2586SX-12/NOPB | Same silicon, TO-263 (S) package with θJA = 26°C/W (7.4× copper area) - lower thermal resistance but requires surface-mount assembly. | Better suited for high-density, thermally constrained PCBs where TO-220 lead spacing is prohibitive. | Select LM2586SX-12/NOPB when board space and thermal budget favor SMT over through-hole mounting. |
| UC3844BD1R2G | Current-mode PWM controller (no integrated switch); requires external 65V/3A NPN transistor; fixed 250 kHz oscillator; no soft-start or sync. | Offers greater flexibility in switch selection and layout but increases BOM count and design complexity. | Choose UC3844BD1R2G only when custom magnetics, higher efficiency targets, or discrete switch optimization are required. |
Compared with LM2586T-12/NOPB, the LM2586SX-12/NOPB delivers superior thermal performance in compact layouts, while the UC3844BD1R2G trades integration for design flexibility - making the LM2586T-12/NOPB optimal for cost-sensitive, medium-power isolated supplies needing rapid time-to-market.
Availability
LM2586T-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical instrumentation requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2586T-12/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 leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade specifications.
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 - prioritizing integration, protection, and ease of use over programmability.
FAQ
What topology does the LM2586T-12/NOPB support?
The LM2586T-12/NOPB supports flyback, boost (step-up), and forward converter topologies. Its internal 3.0A/65V NPN switch, current-mode control, and 12V fixed reference make it especially optimized for single-output flyback designs - as confirmed by TI's application circuits (Figures 6–7, 10–15) and transformer selection guide (Table 1). It does not support buck or SEPIC configurations.
Does the LM2586T-12/NOPB require an external feedback resistor divider?
No. The LM2586T-12/NOPB has an internal 12.0V reference connected to the FB pin - eliminating the need for external resistors. This is distinct from the LM2586-ADJ version, which requires a two-resistor divider to set output voltage. The fixed 12V version simplifies layout and improves accuracy by removing resistor tolerance and drift effects.
How is thermal performance affected by PCB layout for the LM2586T-12/NOPB?
Thermal resistance θJA varies from 65°C/W (no heatsink, minimal copper) to 45°C/W (4 in² copper) for the TO-220 package. To sustain 3A continuous output, the exposed tab (Pin 2) must be soldered to ≥4 in² of 1 oz. copper with thermal vias - otherwise, thermal shutdown will activate above ~65°C ambient. TI's datasheet Figure 38 and Table 7 define exact layout rules.
Can the LM2586T-12/NOPB synchronize to an external clock?
Yes. The Sync pin (Pin 7) accepts an external TTL/CMOS clock up to 200 kHz with 0.75V typical threshold. When driven, the internal oscillator locks to the external signal - enabling EMI reduction in multi-regulator systems. This function is verified in TI's Electrical Characteristics table (fSC, VSTH, ISYNC) and Figure 38 timing diagram.
What protection features are built into the LM2586T-12/NOPB?
The LM2586T-12/NOPB integrates undervoltage lockout (3.30V typ), thermal shutdown (150°C), cycle-by-cycle current limiting (4.0A typ), and soft-start. These are documented in Absolute Maximum Ratings, Operating Ratings, and Electrical Characteristics tables - ensuring safe operation under overload, cold-crank, or elevated ambient conditions without external circuitry.
LM2586T-12/NOPB 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):
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2586T-12/NOPB FAQ
1.How can I place an order for LM2586T-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586T-12/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 LM2586T-12/NOPB reliable?
The price and inventory of LM2586T-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2586T-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2586T-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586T-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586T-12/NOPB?
LM2586T-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586T-12/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 LM2586T-12/NOPB?
For technical support, including LM2586T-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586T-12/NOPB requirements.
6.How does Aetrix verify that LM2586T-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2586T-12/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 LM2586T-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2586T-12/NOPB?
All LM2586T-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2586T-12/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 LM2586T-12/NOPB part is unused and in its original packaging.
Return procedure for LM2586T-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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