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Texas Instruments LM2586SX-3.3
- Part No.:
- LM2586SX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-3.3.pdf
- Description:
- IC REG BST FLYBACK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,382
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Product details
Overview
LM2586SX-3.3 from Texas Instruments is a monolithic 3A flyback/boost/forward switching regulator IC with fixed 3.3V output, NPN 3.0A/65V power switch, ±4% system output voltage tolerance over line and load, 4V–40V input range, and adjustable 100–200 kHz switching frequency. It enables compact, low-component-count isolated or step-up power supplies in industrial control and telecom power modules.
For engineers reviewing the LM2586SX-3.3 datasheet, LM2586SX-3.3 pinout, LM2586SX-3.3 application, or LM2586SX-3.3 equivalent, key selection criteria include its 3.3V fixed-output architecture, TO-263-7 (S) package thermal performance (θJA = 26°C/W with 7.4× copper), current-mode control for transient response, soft-start function, and external shutdown capability via Pin 1.
Technical Context
The LM2586SX-3.3 implements current-mode PWM control with an internal 3.0A NPN switch rated for 65V off-state voltage, enabling flyback, boost, and forward topologies without external gate drivers. Its error amplifier features 1.193 mmho transconductance (typ) and 260 V/V gain (typ), referenced to a stable 3.3V internal bandgap at the feedback pin.
Operation includes programmable oscillator frequency (100–200 kHz via resistor on Pin 1), synchronization capability (VSTH = 0.75V), undervoltage lockout (3.30V threshold), and protection circuits: cycle-by-cycle current limit (4.0A typ), thermal shutdown, and soft-start (11.0 μA typical start-up current).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full line/load/temperature range - guarantees stable rail for 3.3V logic and interface ICs. |
| Input Voltage Range | 4V to 40V - supports wide-input industrial, automotive, and telecom supply rails without pre-regulation. |
| Switch Rating | NPN transistor: 3.0A continuous, 65V standoff - enables direct drive of flyback transformers and boost inductors up to 40W. |
| Switching Frequency | Adjustable 100–200 kHz - allows optimization of magnetic size vs. efficiency; synchronized operation supported. |
| Efficiency | 76% at VIN = 5V, ILOAD = 0.3A - reflects real-world boost/flyback conversion with standard external components. |
| Shutdown Current | <60 μA total (16 μA to VIN + 40 μA to ON/OFF pin) - enables ultra-low-power standby in battery-backed systems. |
| Thermal Resistance | θJA = 26°C/W (TO-263-7, 7.4× copper) - enables >2.5W dissipation at 70°C ambient without heatsink. |
Pinout & Package
LM2586SX-3.3 uses the 7-lead TO-263 (S) surface-mount package with exposed thermal pad. Pin numbering follows TI standard bent-leads configuration (top view): Pin 1 = Freq. Adj./ON-OFF, Pin 2 = Ground, Pin 3 = Feedback, Pin 4 = Compensation, Pin 5 = Output Switch, Pin 6 = Input Voltage, Pin 7 = Ground (thermal pad connected internally).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Freq. Adj. / ON-OFF Control | Resistor-to-ground sets switching frequency; ≥3V applied shuts down device - dual-function pin enables compact layout. |
| Pin 2 & Pin 7 | Ground (GND) | Dual ground pins: Pin 2 for signal reference, Pin 7 tied to thermal pad - reduces noise coupling and improves thermal conduction. |
| Pin 3 | Feedback (FB) | Monitors output via resistive divider; compares to internal 3.3V reference - enables precise regulation without external reference. |
| Pin 4 | Compensation (COMP) | Error amplifier output; connects to RC network for loop stability - critical for phase margin in flyback designs. |
| Pin 5 | Switch (SW) | Collector of internal NPN switch; drives primary winding - requires snubber and proper PCB routing for EMI control. |
| Pin 6 | Input Voltage (VIN) | Main DC input (4–40V); powers internal circuitry and switch base drive - must be bypassed with ≥100μF + 0.1μF. |
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. |
| Internal soft-start | 11.0 μA typical start-up current limits in-rush into input capacitors - prevents tripping upstream fuses or regulators. |
| External shutdown capability | ON/OFF pin draws only 40 μA during shutdown - enables low-power microcontroller wake-up control without level shifters. |
| Family of standard magnetics | TI-qualified flyback transformers (e.g., T7) and inductors (e.g., Schott 67146510) reduce design risk and qualification time. |
| Protection suite | Integrated current limit (4.0A typ), thermal shutdown, and undervoltage lockout (3.30V) - ensures robust operation under fault conditions. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Boost Converter |
|---|---|
Use Scenario: Isolated 3.3V rail generation from 12–24V backplane in programmable logic controller modules. IC Role / Device Role / Timing Role: Primary-side flyback controller with fixed 3.3V output and transformer-isolated feedback. Use Value: Eliminates need for optocoupler-based feedback; ±4% output tolerance ensures reliable operation of ARM Cortex-M4 MCUs and CAN transceivers. |
Use Scenario: Step-up from 12V intermediate bus to 3.3V/2A for high-speed Ethernet PHYs on telecom line cards. IC Role / Device Role / Timing Role: Non-isolated boost regulator with current-mode control and soft-start. Use Value: 76% efficiency at light load preserves thermal budget; 100–200 kHz adjustability avoids sensitive RF bands in dense card layouts. |
| Automotive Body Control Module | Medical Sensor Interface Power |
Use Scenario: Generating 3.3V from 9–16V battery input in body control units with cold-crank support. IC Role / Device Role / Timing Role: Wide-input flyback regulator with UVLO (3.30V) and thermal shutdown. Use Value: Operates down to 4V input - sustains 3.3V output during engine cranking; 125°C junction rating meets AEC-Q100 Grade 2 requirements. |
Use Scenario: Low-noise, isolated 3.3V supply for analog front-end sensors in portable diagnostic devices. IC Role / Device Role / Timing Role: Flyback controller driving TI-qualified T7 transformer with reinforced isolation. Use Value: Fixed 3.3V output eliminates trimming resistors; <60 μA shutdown current extends battery life in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587SX-3.3 | Same pinout, identical 3.3V output, but optimized for higher efficiency in boost topology (80% typ at 12V→3.3V/0.6A); lacks flyback-specific transformer drive tuning. | Better suited for non-isolated boost; less validated for multi-output flyback designs. | Select LM2587SX-3.3 when primary requirement is boost efficiency and isolation is not needed. |
| UC3844BD1R2G | Current-mode PWM controller (not integrated switch); requires external 3A NPN/MOSFET; 250 kHz max frequency; no fixed 3.3V reference. | Greater flexibility in switch selection and topology, but adds BOM count and layout complexity. | Choose UC3844BD1R2G when custom voltage, frequency, or switch specs exceed LM2586SX-3.3 capabilities. |
Compared with LM2587SX-3.3 and UC3844BD1R2G, the LM2586SX-3.3 delivers lowest system component count for 3.3V flyback designs, integrates all protection functions, and provides factory-trimmed output accuracy - making it optimal for cost-sensitive, space-constrained industrial and telecom power supplies.
Availability
LM2586SX-3.3 is available at Aetrix Electronics and suitable for industrial PLC power supplies, telecom line card boost converters, automotive body control modules, and medical sensor interface power requiring stable component supply and long-term lifecycle support.
Supply support for LM2586SX-3.3 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 solutions.
The LM2586 series was designed specifically for cost-effective, low-component-count flyback, boost, and forward converter applications - targeting industrial automation, telecom infrastructure, and automotive subsystems where integration, reliability, and thermal performance are critical.
FAQ
What is the maximum output current capability of the LM2586SX-3.3 in a flyback configuration?
The LM2586SX-3.3 supports up to 1.4A output current in flyback configurations, as validated in TI's Figure 10 reference design using the T7 transformer. This assumes proper thermal design (θJA ≤26°C/W) and operation within the 4V–40V input range. Output current is internally limited in flyback mode per TI Application Hints, unlike boost mode where external current limiting is required.
Does the LM2586SX-3.3 require an external feedback resistor network?
No, the LM2586SX-3.3 does not require external feedback resistors. It integrates a precise 3.3V reference and internal resistor divider, so the feedback pin (Pin 3) connects directly to the output via a single resistor in standard flyback/boost layouts. External resistors are only needed for the compensation network (Pin 4) and frequency adjustment (Pin 1).
Can the LM2586SX-3.3 be synchronized to an external clock signal?
Yes, the LM2586SX-3.3 supports synchronization via its Sync pin (Pin 1 when used as frequency adjust). Applying a TTL-compatible square wave with VSTH = 0.75V (min) and 0.875V (max) threshold enables multiple LM2586SX-3.3 devices to operate at the same switching frequency - reducing beat frequencies and EMI in multi-rail systems.
What is the thermal performance difference between the TO-220 and TO-263 packages for the LM2586SX-3.3?
The TO-263-7 (S) package used in LM2586SX-3.3 achieves θJA = 26°C/W with 7.4× copper area, while the TO-220-7 (T) package achieves θJA = 45°C/W under identical conditions. This 42% lower thermal resistance allows the LM2586SX-3.3 to dissipate ~1.5× more power before reaching 125°C junction temperature - critical for high-density PCB layouts.
Is the LM2586SX-3.3 RoHS compliant and halogen-free?
Yes, the LM2586SX-3.3 is RoHS compliant and halogen-free per TI's official product change notices and packaging specifications. The TO-263-7 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), supporting standard reflow profiles without preconditioning.
LM2586SX-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LM2586SX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-3.3 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-3.3 reliable?
The price and inventory of LM2586SX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2586SX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2586SX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-3.3?
LM2586SX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-3.3 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-3.3?
For technical support, including LM2586SX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-3.3 requirements.
6.How does Aetrix verify that LM2586SX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2586SX-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM2586SX-3.3?
All LM2586SX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM2586SX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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