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Texas Instruments LM2586SX-ADJ/NOPB
- Part No.:
- LM2586SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:872
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Product details
Overview
LM2586SX-ADJ/NOPB from Texas Instruments is a monolithic step-up (boost) and flyback switching regulator IC with an adjustable output voltage, 4 V to 40 V input range, 3 A NPN internal switch rated for 65 V standoff, current-mode control, and programmable 100–200 kHz switching frequency. It delivers stable DC-DC conversion in space-constrained industrial power supplies.
For engineers reviewing the LM2586SX-ADJ/NOPB datasheet, LM2586SX-ADJ/NOPB pinout, LM2586SX-ADJ/NOPB application, or LM2586SX-ADJ/NOPB equivalent, key selection criteria include its adjustable reference (1.230 V), ±4% system output tolerance over line/load, external shutdown capability, soft-start function, and compatibility with standard flyback transformers and boost inductors.
Technical Context
The LM2586SX-ADJ/NOPB implements current-mode PWM control using an internal error amplifier (transconductance = 3.200 mmho typ., gain = 670 V/V typ.) referenced to a precision 1.230 V bandgap. Its oscillator supports resistor-programmed (100–200 kHz) or external synchronization via pin 6, enabling noise-sensitive multi-rail designs.
Protection includes undervoltage lockout (3.30 V threshold), thermal shutdown, cycle-by-cycle current limiting (4.0 A typ.), and switch saturation voltage of 0.45 V at 3.0 A. The device operates across −40°C to +125°C junction temperature with integrated soft-start (11.0 μA startup current) and <60 μA shutdown supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation |
| Output Voltage | Adjustable via R1/R2 divider - enables precise regulation from ~1.25 V to >40 V depending on external components |
| Switch Current Rating | 3 A continuous, 4.0 A typical current limit - defines maximum inductor peak current in boost/flyback topologies |
| Reference Voltage | 1.230 V ±2.2% - sets feedback accuracy baseline; used with external resistors to program output |
| Switching Frequency | 100–200 kHz (resistor-programmable) - balances magnetics size, efficiency, and EMI filtering requirements |
| System Output Tolerance | ±4% over line, load, and temperature - ensures stable output without post-regulation in many applications |
| Shutdown Supply Current | 16 μA typ. at VIN + 40 μA at ON/OFF pin - enables ultra-low-power standby in battery-powered systems |
Pinout & Package
LM2586SX-ADJ/NOPB is housed in a 7-pin DDPAK/TO-263 package (14.986 mm × 10.16 mm), optimized for high-power dissipation with exposed thermal pad soldered to PCB copper.
| 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 |
| 2 (Ground) | Power and signal reference | Common return for internal circuitry, switch emitter, and compensation network |
| 3 (Feedback) | Error amplifier input | Compares divided output voltage against 1.230 V reference to regulate output |
| 4 (Compensation) | Error amplifier output | Connects to RC network for loop stability; transconductance = 3.200 mmho typ. |
| 5 (Input) | Main power input | Accepts 4–40 V DC; feeds internal bias and switch base drive circuitry |
| 6 (Sync) | External clock input | Accepts negative-going sync pulses to align switching frequency with system clock |
| 7 (Switch) | NPN collector output | Drives primary winding of flyback transformer or boost inductor; withstands 65 V |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Improves transient response and line/load regulation; enables inherent cycle-by-cycle current limiting |
| Adjustable 100–200 kHz oscillator | Allows optimization of magnetic component size and EMI filter design without changing IC |
| Integrated soft-start | Reduces inrush current during power-up by gradually increasing duty cycle via 11.0 μA startup current |
| External synchronization (pin 6) | Enables noise reduction in multi-rail systems by locking switching frequency to master clock |
| Thermal/UVLO/current protection | Ensures robust operation under overload, low-input, or high-temperature conditions without external circuitry |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
Use Scenario: Isolated 12 V output from 9–16 V vehicle battery for infotainment subsystems with variable load. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology; regulates output via optocoupler feedback and 100 kHz switching. Use Value: Delivers ±4% output tolerance across cold-crank (6 V) to load-dump (40 V) conditions without secondary-side regulation. | Use Scenario: Generating 24 V rail from 12 V battery for ADAS camera modules requiring low EMI. IC Role / Device Role / Timing Role: Step-up regulator with synchronized 200 kHz operation to avoid interference with radar bands. Use Value: Enables compact magnetics and predictable noise spectrum via external sync pin (pin 6). |
| Programmable Lab PSU | Telecom DC-DC Module |
Use Scenario: Bench power supply with digitally adjustable 3–30 V output and constant-current limit. IC Role / Device Role / Timing Role: Adjustable-output boost controller; feedback divider set by DAC-controlled resistors. Use Value: 1.230 V reference and wide VIN enable precise, stable output programming across full range. | Use Scenario: Distributed power architecture supplying 5 V/3 A from −48 V telecom bus. IC Role / Device Role / Timing Role: Flyback controller operating at 125 kHz (RSET = 47 kΩ) for optimal transformer core utilization. Use Value: 3 A switch and 65 V standoff support high step-down ratio while maintaining safety margin on primary side. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587SX-ADJ/NOPB | Same pinout, identical electrical specs, but rated for higher ambient temperature (−40°C to +150°C vs. +125°C) | Suitable for under-hood automotive or high-temp industrial enclosures where junction temp exceeds 125°C | Select when extended thermal rating is required; otherwise functionally interchangeable |
| TPS40210DRCT | Current-mode controller (external MOSFET), 4.5–52 V input, 1.22 V ref, no integrated switch | Used where higher efficiency (>95%), higher current (>5 A), or discrete FET selection is needed | Choose for designs requiring >3 A output or custom FET optimization; adds external gate driver complexity |
Compared with LM2587SX-ADJ/NOPB, the LM2586SX-ADJ/NOPB offers identical functionality at lower cost and standard temperature grade; versus TPS40210DRCT, it trades external FET flexibility for integration simplicity and reduced BOM count in ≤3 A applications.
Availability
LM2586SX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial flyback power supplies, automotive boost converters, programmable lab PSUs, and telecom DC-DC modules requiring stable component supply and long-term production continuity.
Supply support for LM2586SX-ADJ/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 specializing in analog and embedded processing technologies, with leadership in power management ICs since the 1970s.
The LM2586 series was designed for cost-effective, low-component-count DC-DC conversion in flyback, boost, and forward converter topologies targeting industrial, telecom, and automotive power systems.
FAQ
What is the minimum input voltage required for stable operation of the LM2586SX-ADJ/NOPB?
The LM2586SX-ADJ/NOPB requires a minimum input voltage of 4 V to maintain regulation and internal bias functionality. Below this threshold, undervoltage lockout activates at 3.30 V (typ.), disabling the switch and reducing supply current to 16 μA. This ensures reliable startup from partially discharged batteries or brown-out conditions in industrial systems using the LM2586SX-ADJ/NOPB.
How is the output voltage adjusted on the LM2586SX-ADJ/NOPB?
The LM2586SX-ADJ/NOPB uses an external resistor divider (R1, R2) connected between output, feedback pin (pin 3), and ground to set output voltage per VOUT = 1.230 V × (1 + R1/R2). The internal 1.230 V reference is trimmed to ±2.2%, and R2 should be 1–5 kΩ using 1% metal film resistors for best temperature stability. This configuration is confirmed in Section 7.3.3 and Electrical Characteristics Table 6.8 for the LM2586SX-ADJ/NOPB.
Can the LM2586SX-ADJ/NOPB be synchronized to an external clock source?
Yes, the LM2586SX-ADJ/NOPB supports external synchronization via pin 6 (Sync). A negative-going pulse below 0.875 V threshold synchronizes the internal oscillator to an external clock, enabling noise reduction in multi-rail systems. Figure 24 and Section 7.3.6 confirm this capability for the LM2586SX-ADJ/NOPB, with 700 ns delay from sync edge to switch turn-on observed in test circuits.
What thermal considerations apply to the LM2586SX-ADJ/NOPB in TO-263 package?
The LM2586SX-ADJ/NOPB in DDPAK/TO-263 has RθJA = 35°C/W (with 0.4896 in² copper) and RθJC = 2°C/W. To avoid thermal shutdown at 150°C max junction temperature, maximum power dissipation must stay below [150 − TA]/35 W. Layout requires soldering the exposed thermal pad to ≥0.4896 in² of 1 oz. copper; Section 9.3 and Thermal Information Table 6.4 specify these requirements for the LM2586SX-ADJ/NOPB.
Does the LM2586SX-ADJ/NOPB include built-in protection features?
Yes, the LM2586SX-ADJ/NOPB integrates undervoltage lockout (3.30 V threshold), thermal shutdown, cycle-by-cycle current limiting (4.0 A typ.), and switch overvoltage protection (65 V standoff). These functions operate without external components and are verified in Absolute Maximum Ratings (Section 6.1), Recommended Operating Ratings (Section 6.3), and Feature Description (Section 7.3) of the LM2586SX-ADJ/NOPB datasheet.
LM2586SX-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 60V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM2586SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2586SX-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2586SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-ADJ/NOPB?
LM2586SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-ADJ/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-ADJ/NOPB?
For technical support, including LM2586SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2586SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2586SX-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2586SX-ADJ/NOPB?
All LM2586SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2586SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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