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Texas Instruments LM2586SX-3.3/NOPB
- Part No.:
- LM2586SX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-3.3/NOPB.pdf
- Description:
- IC REG BST FLYBACK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,886
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Product details
Overview
LM2586SX-3.3/NOPB from Texas Instruments is a monolithic 3-A step-up (boost) and flyback switching regulator IC with fixed 3.3-V output, 4-V to 40-V input range, internal 3-A NPN switch rated for 65-V standoff, current-mode control, and adjustable 100–200-kHz switching frequency. It delivers regulated power in space-constrained industrial power supplies and automotive auxiliary rails.
For engineers reviewing the LM2586SX-3.3/NOPB datasheet, LM2586SX-3.3/NOPB pinout, LM2586SX-3.3/NOPB application, or LM2586SX-3.3/NOPB equivalent, key selection considerations include its fixed 3.3-V output tolerance (±4%), external shutdown capability (pin 1), soft-start function, thermal/UVLO protection, and compatibility with standard flyback transformers and boost inductors.
Technical Context
The LM2586SX-3.3/NOPB implements current-mode control using an internal error amplifier (transconductance = 1.193 mmho, gain = 260 V/V) that compares feedback voltage against a 3.3-V reference derived from a 1.23-V bandgap core. Its oscillator supports resistor-programmed frequency (100–200 kHz) or external synchronization via pin 6, enabling noise-sensitive multi-rail systems.
Protection architecture includes undervoltage lockout (3.3 V threshold), thermal shutdown, cycle-by-cycle current limiting (4.0 A typical limit), and soft-start (11 μA charging current). The integrated 3-A NPN switch exhibits 0.45-V saturation voltage at 3 A and sustains up to 65 V, supporting wide-VIN flyback and boost topologies without external high-voltage transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over line/load/temperature - ensures stable logic rail generation without external feedback resistors. |
| Input Voltage Range | 4 V to 40 V - supports 5-V, 12-V, and 24-V industrial bus inputs, including automotive battery transients. |
| Switch Current Rating | 3 A continuous, 4 A current-limit threshold - enables ≥10-W output in boost mode with external current limiting. |
| Switch Voltage Rating | 65 V standoff - allows safe operation in flyback configurations with reflected output voltages up to 60 V. |
| Switching Frequency | 100–200 kHz (resistor-adjustable or sync-capable) - balances magnetics size, EMI, and efficiency for mid-power designs. |
| Shutdown Current | <60 μA total (16 μA to VIN + 40 μA to ON/OFF pin) - minimizes standby power in battery-backed systems. |
| Reference Voltage | 3.3 V nominal at FB pin (3.242–3.358 V min/max) - defines output accuracy and enables direct monitoring of regulated rail. |
Pinout & Package
LM2586SX-3.3/NOPB is housed in a thermally enhanced 7-pin DDPAK/TO-263 package (14.986 mm × 10.16 mm), with exposed thermal pad for PCB heat sinking. Pin numbering follows standard top-view layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Freq Adj / ON-OFF) | Multi-function control input | Resistor-to-ground sets frequency (100–200 kHz); ≥3 V applied shuts down device with <60 μA quiescent draw. |
| 2 (Ground) | Power and signal reference | Common return for internal circuitry, switch emitter, and compensation network - must connect to low-impedance ground plane. |
| 3 (Feedback) | Output voltage sensing input | Monitors regulated 3.3-V output via internal divider; open-circuit disables regulation and forces shutdown. |
| 4 (Compensation) | Error amplifier output | Drives external RC network to stabilize loop response; transconductance = 1.193 mmho enables precise pole-zero placement. |
| 5 (VIN) | Main power supply input | Accepts 4–40 V DC; powers internal bias circuits and switch base drive - requires local 10-μF ceramic bypass. |
| 6 (Sync) | External clock synchronization | Falling-edge triggered; synchronizes switching to external 200-kHz source with 700-ns delay - eliminates beat frequencies. |
| 7 (Switch) | Collector of internal NPN transistor | Connects to primary winding (flyback) or inductor (boost); handles 3-A peak current and 65-V transient voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response, inherent cycle-by-cycle current limiting, and simplified loop compensation vs. voltage-mode. |
| Integrated 3-A/65-V NPN switch | Eliminates need for external high-current/high-voltage transistor - reduces BOM count and layout complexity in flyback/boost. |
| Internal soft-start | 11-μA constant-current charge on compensation pin limits inrush current during startup - prevents input rail collapse. |
| Frequency synchronization | Allows multiple LM2586SX-3.3/NOPB units to operate at identical switching frequency - suppresses inter-rail beat noise. |
| Thermal/UVLO/current protection | Automatically disables switch under overtemperature (>150°C), input undervoltage (<3.3 V), or overcurrent - ensures robust field operation. |
Applications
| Industrial PLC I/O Power | Automotive Infotainment Rail |
|---|---|
Use Scenario: Generating isolated 3.3-V logic supply from 24-V PLC backplane for digital I/O modules. IC Role / Device Role / Timing Role: Flyback controller regulating secondary-side output with transformer isolation and galvanic separation. Use Value: Achieves ±4% output stability across −40°C to +125°C ambient while meeting IEC 61000-4-5 surge immunity via transformer clamping. |
Use Scenario: Stepping up 9–16-V automotive battery to stable 3.3-V rail for microcontroller and CAN transceiver in head unit. IC Role / Device Role / Timing Role: Step-up (boost) regulator with UVLO tracking battery brownout conditions and thermal shutdown during engine-off hot soak. Use Value: Maintains regulation during cold-crank (4.5 V min) and load-dump (40 V max) events without external TVS or LDO post-regulation. |
| Medical Sensor Interface Supply | Point-of-Sale Terminal Boost |
Use Scenario: Providing low-noise 3.3-V supply for analog front-end sensors in portable diagnostic devices powered by Li-ion battery. IC Role / Device Role / Timing Role: Fixed-output boost converter operating from 3.0–4.2-V battery, synchronized to system clock to avoid EMI in sensitive ADC bands. Use Value: Synchronization reduces conducted EMI peaks by >15 dB; ±4% output tolerance ensures consistent sensor bias and ADC reference scaling. |
Use Scenario: Generating 3.3-V rail from 5-V USB-C PD input in compact retail kiosks with limited board area. IC Role / Device Role / Timing Role: Compact boost regulator using standard 22-μH inductor and Schottky diode - no custom magnetics required. Use Value: Resistor-programmable 200-kHz operation shrinks inductor size by 40% vs. 100-kHz baseline while maintaining >76% efficiency at 1-A load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up/flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2586T-3.3/NOPB | TO-220-7 package (10.1 mm × 8.89 mm); higher θJA (65°C/W vs. 56°C/W); same electrical specs. | Better suited for prototyping or low-volume heatsink-mounted designs where manual assembly is preferred. | Select when mechanical mounting constraints favor through-hole TO-220 over surface-mount DDPAK. |
| LM2587SX-3.3/NOPB | Same pinout and function but optimized for higher efficiency (93% vs. 76% at 5-VIN/0.3-A); uses improved NPN process. | Preferred for thermally constrained applications requiring lower junction temperature rise at full load. | Choose when thermal margin is critical and efficiency above 85% is required at mid-load conditions. |
Compared with LM2586SX-3.3/NOPB, the TO-220 variant offers easier thermal testing but requires more PCB area, while the LM2587SX-3.3/NOPB delivers superior thermal performance and efficiency at the cost of higher unit price and identical footprint compatibility.
Availability
LM2586SX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLC I/O power, automotive infotainment rails, medical sensor interfaces, and point-of-sale terminal boost applications requiring stable component supply and long-term manufacturability.
Supply support for LM2586SX-3.3/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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in power management ICs.
The LM2586 series was designed specifically for cost-sensitive, wide-input-voltage flyback and step-up converter applications where minimal external components and robust protection are essential - targeting industrial, automotive, and medical power subsystems.
FAQ
What is the maximum output current achievable with LM2586SX-3.3/NOPB in boost configuration?
The LM2586SX-3.3/NOPB integrates a 3-A NPN switch with 4-A current-limit threshold, but output current in boost mode is externally limited by inductor saturation and diode rating. For reliable operation, output current must be capped at ≤3 A using external current-sense or foldback protection - the IC does not internally limit boost output current per datasheet Section 6.3.
Can LM2586SX-3.3/NOPB be used in flyback topology with multiple outputs?
Yes, LM2586SX-3.3/NOPB is explicitly qualified for flyback operation per its datasheet description and Figure 16 design example. Multiple outputs are supported using auxiliary windings on the transformer, with cross-regulation maintained by the current-mode control architecture and 3.3-V primary feedback loop.
Does LM2586SX-3.3/NOPB require an external feedback resistor divider?
No - LM2586SX-3.3/NOPB is the fixed 3.3-V output version. Its internal feedback divider sets VOUT = 3.3 V; the FB pin connects directly to the output and requires no external resistors. Using external resistors would disrupt regulation and is not supported.
How does the shutdown function work on LM2586SX-3.3/NOPB?
Applying ≥3 V to pin 1 (ON/OFF) sources current into the IC and forces shutdown, reducing total supply current to <60 μA. An isolation diode is mandatory per Figure 23 to prevent interference with frequency adjustment. To resume operation, pin 1 must be left floating or pulled below 1.6 V threshold.
What thermal management is required for LM2586SX-3.3/NOPB at full 3-A load?
At full load with 12-V input and 3.3-V output, LM2586SX-3.3/NOPB dissipates ~3.5 W. With θJA = 56°C/W (DDPAK on 0.136-in² copper), junction temperature rise is ~196°C - exceeding 125°C max. A minimum 0.4896-in² copper pour (θJA = 35°C/W) or external heatsink is required to maintain TJ < 125°C.
LM2586SX-3.3/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2586SX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-3.3/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 LM2586SX-3.3/NOPB reliable?
The price and inventory of LM2586SX-3.3/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2586SX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-3.3/NOPB?
LM2586SX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-3.3/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 LM2586SX-3.3/NOPB?
For technical support, including LM2586SX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2586SX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2586SX-3.3/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 LM2586SX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2586SX-3.3/NOPB?
All LM2586SX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-3.3/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 LM2586SX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2586SX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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