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Texas Instruments LM2586SX-ADJ
- Part No.:
- LM2586SX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586SX-ADJ.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,794
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Product details
Overview
LM2586SX-ADJ 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 100–200 kHz programmable switching frequency. It enables compact, high-efficiency DC-DC conversion in industrial power supplies requiring wide VIN and stable multi-output regulation.
For engineers reviewing the LM2586SX-ADJ datasheet, LM2586SX-ADJ pinout, LM2586SX-ADJ application, or LM2586SX-ADJ equivalent, key selection considerations 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 per TI's recommended component guides.
Technical Context
The LM2586SX-ADJ implements current-mode PWM control with an internal 1.230-V precision reference, error amplifier, oscillator with resistor-programmable frequency (100–200 kHz), and thermal/UVLO/current-limited 3-A NPN power switch. Its architecture supports both flyback and boost topologies via external transformer or inductor selection.
It features synchronized switching capability via Pin 6 (SYNC), external shutdown via Pin 1 (ON/OFF), soft-start current sourcing (11 μA typical), and compensation pin (Pin 5) with transconductance of 3.200 mmho (typ) for loop stability tuning - all integrated into a single 7-pin TO-263 (DDPAK) package.
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 - set by VOUT = 1.230 V × (1 + R1/R2); enables precise custom rail generation. |
| Switch Current Limit | 4.0 A (typ), 3.0–7.0 A (min/max) - protects internal NPN transistor during overload or short-circuit events. |
| Oscillator Frequency | 100–200 kHz (programmable via external resistor on Pin 1) - balances efficiency, magnetics size, and EMI performance. |
| Reference Voltage | 1.230 V (typ), ±1.5 mV line regulation - provides stable feedback baseline for accurate output regulation across input range. |
| Shutdown Supply Current | 16 μA (typ) - minimizes standby power loss in battery-powered or energy-sensitive applications. |
| Max Duty Cycle | 98% (typ) - enables high step-up ratios (e.g., 5 V → 24 V) with minimal dropout margin. |
| Thermal Shutdown | 150°C junction temperature - prevents permanent damage under sustained overload or poor heatsinking. |
Pinout & Package
LM2586SX-ADJ is housed in a 7-pin DDPAK/TO-263 (KTW) package with exposed thermal pad for enhanced power dissipation. The package measures 14.986 mm × 10.16 mm and is designed for surface-mount assembly with optional heatsink attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: FREQ/SHDN | Frequency adjust / shutdown control | Resistor-to-ground sets oscillator frequency (100–200 kHz); ≥3 V applied shuts down device, drawing only 16 μA supply current. |
| Pin 2: GND | Power and signal ground | Common return for internal circuitry, switch emitter, and compensation network; must be low-impedance connection to thermal pad. |
| Pin 3: OUT | Switch collector output | Drives primary winding of flyback transformer or boost inductor; rated for 65 V standoff and 3 A continuous switch current. |
| Pin 4: IN | Input voltage supply | Accepts 4–40 V DC input; powers internal bias circuits and switch base drive; includes undervoltage lockout (3.3 V threshold). |
| Pin 5: COMP | Error amplifier output | Provides transconductance-controlled compensation node (3.200 mmho typ); connects to RC network for loop stability tuning. |
| Pin 6: SYNC | External synchronization input | Accepts negative-going pulses to align switching frequency with external clock - eliminates beat frequencies in multi-rail systems. |
| Pin 7: FB | Feedback input | Monitors divided output voltage; compares to 1.230 V internal reference to regulate output within ±4% system tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Improves transient response and line/load regulation while enabling cycle-by-cycle current limiting for robust fault protection. |
| Internal soft-start | Reduces inrush current during startup by gradually ramping peak switch current - prevents input rail sag and output overshoot. |
| Programmable switching frequency | Allows optimization of magnetic size, capacitor ESR, and EMI filter design across 100–200 kHz without changing IC or layout. |
| External synchronization | Enables phase-aligned operation of multiple LM2586SX-ADJ units - critical for noise-sensitive instrumentation and multi-phase power systems. |
| Integrated 3-A/65-V NPN switch | Eliminates need for external high-voltage power transistor - reduces BOM count, PCB area, and layout complexity in isolated/non-isolated converters. |
| ±4% system output tolerance | Guaranteed over full line, load, and temperature range - simplifies system-level accuracy validation and reduces need for post-regulation trimming. |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
Use Scenario: Generating isolated 12 V and 5 V rails from a 24 V truck battery in engine control units, where space and thermal constraints limit use of discrete controllers. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with transformer-coupled feedback; regulates output via current-mode PWM at 125 kHz. Use Value: Achieves ±4% output tolerance across −40°C to +125°C ambient using TI-recommended transformer family and single IC - eliminates secondary-side optocoupler and TL431. | Use Scenario: Stepping up nominal 12 V battery voltage to 24 V for powering ADAS cameras and radar modules during cold cranking (down to 6 V). IC Role / Device Role / Timing Role: Step-up (boost) regulator with adjustable output; uses external 22 kΩ resistor to set 200 kHz switching for compact inductor sizing. Use Value: Delivers 3 A continuous output at >85% efficiency from 6–16 V input - sustains camera operation during engine start without brownout. |
| Multi-Output Telecom Adapter | Programmable Lab Power Supply |
Use Scenario: Providing +12 V, −12 V, and +5 V outputs from a universal AC/DC front-end in telecom shelf power systems. IC Role / Device Role / Timing Role: Single-flyback controller with auxiliary windings; uses current-mode control to maintain cross-regulation between outputs without post-regulators. Use Value: Enables <1% cross-load regulation drift across outputs using TI's recommended transformer and diode selection guide - reduces component count vs. dual-controller approach. | Use Scenario: Building a benchtop DC power supply with digitally adjustable 1.2–30 V output and 3 A current limit for prototyping embedded systems. IC Role / Device Role / Timing Role: Adjustable-output boost/flyback core; feedback divider updated via DAC; frequency synchronized to system MCU clock for deterministic EMI. Use Value: Supports 0.1 V resolution output programming and <50 mVpp ripple via 200 kHz sync - meets lab-grade stability and noise requirements without linear pass elements. |
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 | Same pinout, identical functional block diagram, but optimized for higher efficiency at light loads due to lower quiescent current (11 mA vs. 15.5 mA typ at no load). | Preferred for battery-backed or always-on systems where standby power matters more than peak 3-A capability. | Select LM2587SX-ADJ when input supply is limited (e.g., solar-charged LiFePO₄) and light-load efficiency dominates design priority. |
| UC3845N | Fixed 2.5 V reference, no integrated switch - requires external MOSFET; lacks soft-start, sync, and thermal shutdown; 1 A max switch current rating. | Suitable only for lower-power (<1 A), cost-sensitive designs where board space allows discrete switch and extra protection components. | Choose UC3845N only if legacy design reuse, extreme BOM cost pressure, or need for >100 V switch voltage (with external FET) outweighs integration benefits of LM2586SX-ADJ. |
Compared with LM2587SX-ADJ, the LM2586SX-ADJ delivers higher peak current (3 A vs. 2 A) and better thermal robustness (65 V switch rating vs. 60 V), making it preferable for industrial flyback designs; versus UC3845N, it offers full integration, simplified layout, and guaranteed ±4% system tolerance - eliminating calibration and protection circuitry.
Availability
LM2586SX-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC converters, and telecom adapter designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2586SX-ADJ 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, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2586SX-ADJ belongs to TI's legacy wide-VIN switching regulator product line, engineered specifically for rugged flyback and boost applications in harsh environments - emphasizing integration, thermal resilience, and system-level tolerance guarantees.
FAQ
What is the maximum output voltage achievable with LM2586SX-ADJ?
The LM2586SX-ADJ has no fixed upper output voltage limit - it is determined by external resistor divider and transformer/inductor ratings. Per datasheet Figure 55, tested configurations reach 12 V with ±4% system tolerance; higher voltages (e.g., 24 V, 48 V) are feasible using appropriate magnetics and output rectifiers, provided switch voltage remains ≤65 V and duty cycle stays ≤98%.
Does LM2586SX-ADJ require an external diode for flyback operation?
Yes - LM2586SX-ADJ requires an external output rectifier diode in flyback topology. The IC drives the transformer primary; energy transfer occurs through secondary-side diode conduction during switch-off. TI recommends fast-recovery or Schottky diodes rated ≥100 V PIV and ≥3 A average current, such as MUR460 or SS34, per Application Note SLVA053.
Can LM2586SX-ADJ be used in boost configuration without a transformer?
Yes - LM2586SX-ADJ supports non-isolated boost operation using a single inductor, output diode, and feedback divider. Figure 20 in the datasheet shows this configuration explicitly. Input voltage must remain within 4–40 V, and output voltage must stay below 65 V to avoid exceeding the internal switch's voltage rating.
What is the purpose of the COMP pin on LM2586SX-ADJ?
Pin 5 (COMP) is the error amplifier output node. It sources/sinks current to control the PWM comparator threshold and thus regulates output voltage. A Type II or III compensation network (resistor + capacitor(s)) connects here to stabilize the control loop - TI specifies 3.200 mmho transconductance and recommends RC values based on selected switching frequency and output filter characteristics.
How does the shutdown function work on LM2586SX-ADJ?
Applying ≥3 V to Pin 1 (FREQ/SHDN) forces LM2586SX-ADJ into shutdown mode, reducing total supply current to 16 μA (typ). An isolation diode is required between the shutdown source and Pin 1 to prevent interference with frequency adjustment. During shutdown, the internal switch is disabled, COMP pin is clamped, and FB pin monitoring ceases - ensuring zero output power delivery.
LM2586SX-ADJ 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:
- 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 FAQ
1.How can I place an order for LM2586SX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586SX-ADJ 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 reliable?
The price and inventory of LM2586SX-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM2586SX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586SX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586SX-ADJ?
LM2586SX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586SX-ADJ 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?
For technical support, including LM2586SX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586SX-ADJ requirements.
6.How does Aetrix verify that LM2586SX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2586SX-ADJ 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 meets industry standards.
7.What is the process for return or replacement of LM2586SX-ADJ?
All LM2586SX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2586SX-ADJ, 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 part is unused and in its original packaging.
Return procedure for LM2586SX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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