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Texas Instruments LM2586T-ADJ
- Part No.:
- LM2586T-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2586T-ADJ.pdf
- Description:
- IC REG BST FLYBCK ADJ 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
LM2586T-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 programmable 100–200 kHz switching frequency. It serves as the primary power conversion controller in isolated or non-isolated DC-DC supplies for industrial sensors and battery-powered instrumentation.
For engineers reviewing the LM2586T-ADJ datasheet, LM2586T-ADJ pinout, LM2586T-ADJ application, or LM2586T-ADJ 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 LM2586T-ADJ implements current-mode PWM control using an internal error amplifier with 670 V/V gain and 3.2 mmho transconductance, comparing feedback-derived voltage against a precision 1.230 V reference. Its oscillator supports resistor-programmed (100–200 kHz) or external synchronization via pin 6, enabling noise-sensitive multi-rail systems.
Protection architecture includes undervoltage lockout (3.30 V threshold), thermal shutdown, cycle-by-cycle current limiting (4.0 A typical limit), and switch saturation voltage of 0.45 V at 3.0 A - all integrated into a single TO-220-7 or DDPAK/TO-263-7 package with shared pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial and automotive battery rails without pre-regulation |
| Output Voltage | Adjustable via R1/R2 divider - enables precise regulation from ~1.25 V to >40 V depending on transformer/inductor design |
| Switch Current Limit | 4.0 A typical - sets maximum peak inductor current to prevent core saturation and switch overstress |
| Reference Voltage | 1.230 V ±2.2% - high-accuracy internal bandgap used for feedback loop stability and output accuracy |
| Switching Frequency | 100–200 kHz - adjustable via external resistor on pin 1; higher frequencies reduce magnetic size but increase switching loss |
| Efficiency | Up to 93% - achieved in 12-V flyback configuration at 10 V input and 0.6 A load, minimizing thermal management needs |
| Shutdown Current | 16 μA - ultra-low quiescent draw during disable, critical for battery-backed standby operation |
Pinout & Package
LM2586T-ADJ is available in TO-220-7 (NDZ) and DDPAK/TO-263-7 (KTW) packages, both with identical 7-pin functional mapping and thermal pad exposed on underside for heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Freq Adj / ON-OFF) | Frequency programming & shutdown control | Resistor-to-ground sets switching frequency; ≥3 V applied disables regulator and reduces supply current to 16 μA |
| 2 (Ground) | Power and signal reference | Common return for internal circuits, switch emitter, and compensation network - requires low-impedance PCB plane |
| 3 (Feedback) | Output voltage sensing input | Compares divided output voltage against 1.230 V reference; determines regulation setpoint and loop stability |
| 4 (Compensation) | Error amplifier output | Drives external RC network to set loop bandwidth and phase margin; sinks/sours up to 260 μA |
| 5 (Input) | Main power supply input | Accepts 4–40 V unregulated DC; must be bypassed with low-ESR capacitor near pin |
| 6 (Sync) | External clock synchronization input | Accepts negative-going pulses to align switching edge across multiple regulators, reducing EMI beat frequencies |
| 7 (Switch) | Collector of internal NPN transistor | Connects to primary winding (flyback) or inductor (boost); withstands 65 V transient, switches 3 A continuously |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistor |
| Internal soft-start | 11 μA constant-current ramp on compensation pin limits inrush current and prevents output overshoot at startup |
| Programmable switching frequency | 100–200 kHz range allows optimization of magnetics size vs. efficiency and EMI filter requirements |
| 65 V switch standoff rating | Supports flyback topologies with high turns-ratio transformers and accommodates input transients up to 45 V |
| ±4% system output tolerance | Guaranteed over full line, load, and temperature range - eliminates need for post-regulation trimming in many applications |
Applications
| Industrial Sensor Power Supply | Automotive Battery Backup Converter |
|---|---|
Use Scenario: Provides isolated 5 V or 12 V rail from 12–24 V vehicle battery to power analog sensor front-ends during engine cranking. IC Role / Device Role / Timing Role: Flyback controller regulating output under wide input variation (6–36 V), using transformer isolation and synchronous rectification. Use Value: Maintains stable output despite 6 V cold-crank dips; 93% efficiency minimizes heat in sealed enclosures. | Use Scenario: Generates 3.3 V for microcontroller and RTC from a Li-ion backup cell (2.7–4.2 V) in portable test equipment. IC Role / Device Role / Timing Role: Step-up (boost) regulator with adjustable output and shutdown control for ultra-low-power sleep mode. Use Value: 16 μA shutdown current extends battery life; 1.230 V reference enables accurate low-voltage regulation. |
| Programmable Lab Power Module | Multi-output Telecom Interface Supply |
Use Scenario: Forms the core of a benchtop adjustable DC source delivering 5–24 V at up to 1.5 A from universal AC adapter input. IC Role / Device Role / Timing Role: Adjustable boost controller with external potentiometer-based feedback divider and sync pin tied to master clock. Use Value: Resistor-programmed frequency avoids audible noise; ±4% tolerance ensures calibration-grade output stability. | Use Scenario: Generates +12 V and –5 V rails from a 5 V system bus for RS-232/RS-485 transceivers in industrial gateways. IC Role / Device Role / Timing Role: Dual-output flyback controller using center-tapped secondary and dual diodes; synchronized to system timing reference. Use Value: Single-chip solution reduces BOM count; frequency sync eliminates beat interference with data transmission clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587T-ADJ | Same pinout and architecture but rated for 5 A switch current and 100 V standoff; higher thermal resistance in TO-220-5 package | Better suited for higher-power flyback designs requiring >3 A output or >40 V input transients | Select when higher switch current headroom or extended input surge protection is required |
| TPS40210DGQ | Current-mode controller with external MOSFET drive; no integrated switch; supports up to 1 MHz operation and wider VIN range (4.5–52 V) | Enables custom high-efficiency designs with discrete FETs and advanced magnetics, but requires more external components | Select when design flexibility, higher frequency, or higher efficiency (>95%) is prioritized over component count |
Compared with LM2586T-ADJ, LM2587T-ADJ offers greater switch ruggedness at the cost of larger thermal footprint, while TPS40210DGQ trades integration for design scalability - making LM2586T-ADJ optimal for cost-sensitive, medium-power applications needing minimal external parts.
Availability
LM2586T-ADJ is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive battery backup converters, and programmable lab power modules requiring stable component supply and long-term production continuity.
Supply support for LM2586T-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and communications markets.
The LM2586 series was designed specifically for cost-effective, low-component-count flyback, boost, and forward converter applications - targeting engineers who require robust, thermally efficient DC-DC regulation without complex compensation networks.
FAQ
What is the minimum input voltage required for reliable operation of the LM2586T-ADJ?
The LM2586T-ADJ requires a minimum input voltage of 4 V to ensure proper internal biasing and regulation. Below this threshold, undervoltage lockout activates and disables the switch. This specification is validated across the full operating temperature range (−40°C to +125°C) and guarantees startup and sustained operation when powered from nominal 5 V or 12 V rails with expected droop.
How does the LM2586T-ADJ achieve output voltage adjustment, and what reference voltage is used?
The LM2586T-ADJ achieves output voltage adjustment using an external resistor divider (R1/R2) connected between output, feedback pin, and ground. The internal 1.230 V reference voltage is compared against the divided output voltage; the output is regulated to VOUT = 1.230 V × (1 + R1/R2). This method provides stable, temperature-compensated adjustment with ±2.2% reference accuracy over temperature.
Can the LM2586T-ADJ be used in a flyback topology, and what transformer specifications are recommended?
Yes, the LM2586T-ADJ is explicitly designed for flyback operation, as confirmed by TI's application circuits and transformer selection guides. Recommended flyback transformers feature gapped ferrite cores, 1:1 or custom turns ratios, and isolation ratings matching system safety requirements. TI lists compatible standard parts including the PE-51688 and PH9196 series, optimized for 100–200 kHz operation with the LM2586T-ADJ.
What is the purpose of the Sync pin (pin 6) on the LM2586T-ADJ, and how is it implemented?
The Sync pin (pin 6) on the LM2586T-ADJ accepts negative-going external clock pulses to synchronize the internal oscillator, ensuring deterministic switching edges across multiple regulators. A falling edge triggers the next switching cycle with 700 ns delay. This feature eliminates beat frequencies in multi-rail systems and is validated in TI's synchronized boost regulator reference design (Figure 25, SNVS121E).
Does the LM2586T-ADJ include thermal protection, and how does it behave under overload conditions?
Yes, the LM2586T-ADJ includes thermal shutdown protection that disables the internal switch when junction temperature exceeds 150°C. Under sustained overload, the device cycles on/off as temperature rises and falls - preventing permanent damage. Combined with cycle-by-cycle current limiting (4.0 A typical) and undervoltage lockout, this creates a robust fault-handling sequence validated in TI's thermal characterization (Section 6.4, RθJA = 65°C/W for TO-220).
LM2586T-ADJ 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:
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2586T-ADJ FAQ
1.How can I place an order for LM2586T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586T-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 LM2586T-ADJ reliable?
The price and inventory of LM2586T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2586T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2586T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586T-ADJ?
LM2586T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586T-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 LM2586T-ADJ?
For technical support, including LM2586T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586T-ADJ requirements.
6.How does Aetrix verify that LM2586T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2586T-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 LM2586T-ADJ meets industry standards.
7.What is the process for return or replacement of LM2586T-ADJ?
All LM2586T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2586T-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 LM2586T-ADJ part is unused and in its original packaging.
Return procedure for LM2586T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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