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Texas Instruments LM2587T-ADJ
- Part No.:
- LM2587T-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2587T-ADJ.pdf
- Description:
- IC REG BST FLYBCK ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,972
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Product details
Overview
LM2587T-ADJ from Texas Instruments is a monolithic 5-A step-up (boost) and flyback switching regulator IC with adjustable output voltage, 4 V to 40 V input range, 100 kHz fixed-frequency operation, and integrated 5-A NPN switch rated for 65 V standoff. It delivers ±4% system output voltage tolerance over line and load, and is used in isolated DC/DC converters for industrial power supplies and battery-powered systems requiring wide-input, regulated outputs.
For engineers reviewing the LM2587T-ADJ datasheet, LM2587T-ADJ pinout, LM2587T-ADJ application, or LM2587T-ADJ equivalent, key selection considerations include its adjustable feedback reference (1.23 V), current-mode control architecture, internal soft-start, undervoltage lockout (3.3 V threshold), thermal shutdown protection, and compatibility with standard flyback transformers and boost inductors.
Technical Context
The LM2587T-ADJ implements current-mode PWM control with an internal 100 kHz oscillator, enabling precise peak-current limiting and improved transient response. Its error amplifier compares a resistor-divided output voltage against a 1.230 V reference, generating a compensation signal that modulates switch duty cycle via a transconductance amplifier (3.200 mmho typical) and comparator.
Operation supports both non-isolated boost and isolated flyback topologies: in boost mode, energy transfers through an inductor and output diode; in flyback mode, energy stores in transformer primary during switch-on and releases to secondary during switch-off. Protection includes cycle-by-cycle current limit (6.5 A typ), thermal shutdown, and undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-input applications including 12 V/24 V battery systems and industrial rails. |
| Output Voltage | Adjustable via external resistive divider - set point determined by 1.230 V reference at FB pin. |
| Switch Current Limit | 6.5 A typical - limits peak NPN switch current to prevent device damage under overload. |
| Oscillator Frequency | 100 kHz ±15% - enables use of compact magnetics and predictable EMI profile. |
| Reference Voltage | 1.230 V ±2.2% - high-accuracy feedback reference ensures stable regulation across temperature. |
| Efficiency | 90% typical at 10 V input, 1 A load - optimized for medium-power flyback designs with low conduction loss. |
| UVLO Threshold | 3.30 V ±0.45 V - prevents erratic startup below minimum operating voltage. |
Pinout & Package
LM2587T-ADJ is available in TO-220 (NDH) and DDPAK/TO-263 (KTT) packages. Both are 5-pin thermally enhanced variants with identical pin functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | Power input supply | Accepts 4–40 V DC; connects to bulk input capacitor and ESD protection network. |
| Pin 2: Ground | Power and signal reference | Common return for internal circuitry, switch emitter, and external compensation network. |
| Pin 3: Feedback | Error amplifier input | Monitors output voltage via resistor divider; regulates output to maintain 1.230 V at this pin. |
| Pin 4: Compensation | Error amplifier output | Connects to RC network for loop stability; transconductance = 3.200 mmho typical. |
| Pin 5: Switch | NPN collector output | Drives primary winding (flyback) or inductor (boost); withstands up to 65 V, switches 5 A. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing. |
| Internal soft-start | 11.0 μA soft-start current ramps output gradually, reducing inrush stress on input capacitors and diodes. |
| Thermal shutdown | Activates at 150°C junction temperature, latching off until cool-down - protects against sustained overload or poor heatsinking. |
| Fixed 100 kHz frequency | Eliminates external timing components and simplifies EMI filter design with predictable fundamental frequency. |
| Wide VIN range | Operates from 4 V - supports single-cell LiFePO₄ or multi-cell alkaline inputs without pre-regulation. |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Isolated 12 V/1.2 A output from 8–16 V DC bus in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Flyback controller regulating isolated auxiliary rail; provides galvanic separation and multiple output capability. Use Value: Achieves ±4% output tolerance across full load and line range using standard transformer T1 (Coilcraft Q4339-B) and minimal external parts. | Use Scenario: Boosting 3.6 V Li-ion battery to 12 V for analog sensor excitation and data acquisition circuitry. IC Role / Device Role / Timing Role: Non-isolated step-up regulator with adjustable output; manages variable battery voltage while maintaining stable sensor bias. Use Value: Delivers 90% efficiency at 1 A load and maintains regulation down to 4 V input, extending usable battery life. |
| Automotive Aftermarket Lighting | Telecom Remote Unit |
Use Scenario: Driving LED arrays from 12 V vehicle battery with overvoltage protection during load dump. IC Role / Device Role / Timing Role: Constant-current-capable boost controller; configured with external sense resistor and feedback scaling. Use Value: Withstands 45 V absolute max input and uses internal UVLO (3.3 V) to prevent brownout flicker during cranking. | Use Scenario: Generating ±12 V rails from 24 V PoE-derived supply in remote radio head enclosure. IC Role / Device Role / Timing Role: Dual-output flyback controller; one winding delivers +12 V, second delivers −12 V for op-amp biasing. Use Value: Supports dual-rail analog circuitry with <100 mV ripple using transformer T3 (Renco RL-5533) and achieves ±4% tolerance per rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up and flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2585T-ADJ | Same topology and pinout; lower 3-A switch current rating and 40 V max switch voltage. | Suitable only for ≤3 A flyback/boost loads; requires derating at high ambient temperatures. | Select when output current ≤3 A and board space allows larger heatsink due to higher RθJA. |
| UC3845N | Current-mode PWM controller (not integrated switch); requires external MOSFET and gate driver. | Supports higher voltage/current designs but increases BOM count and layout complexity. | Choose for >5 A or >65 V applications where discrete switch optimization is required. |
Compared with LM2587T-ADJ, LM2585T-ADJ offers reduced current capability and thermal margin, while UC3845N provides greater flexibility at the cost of external component overhead and no integrated protection features like UVLO or thermal shutdown.
Availability
LM2587T-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, automotive lighting systems, and telecom remote units requiring stable component supply and long-term manufacturability.
Supply support for LM2587T-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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2587 series was designed specifically for cost-sensitive, medium-power flyback, boost, and forward converter applications where integration, reliability, and ease of use are critical - targeting designers needing minimal external components and proven transformer compatibility.
FAQ
What is the feedback reference voltage of the LM2587T-ADJ?
The LM2587T-ADJ uses a precision 1.230 V ±2.2% internal reference voltage at the Feedback (FB) pin. This value is specified over the full operating temperature range (−40°C to +125°C) and serves as the regulation setpoint for externally adjustable output voltages. The LM2587T-ADJ maintains this reference with ±1.5 mV line regulation across 4 V to 40 V input, ensuring stable output despite input variations.
Can the LM2587T-ADJ be used in a non-isolated boost configuration?
Yes, the LM2587T-ADJ supports non-isolated boost operation with a minimum set of external components: input capacitor, power inductor, Schottky output diode, and output capacitor. Its 5-A NPN switch and 65 V standoff enable reliable boost conversion up to ~48 V output. The LM2587T-ADJ datasheet includes Figure 16 (12-V Boost Regulator) and Figures 18–21 as validated boost application circuits.
What package options are available for the LM2587T-ADJ?
The LM2587T-ADJ is offered in two thermally robust packages: 5-pin TO-220 (NDH) and 5-pin DDPAK/TO-263 (KTT). Both share identical pinout and electrical characteristics. The KTT package has lower thermal resistance (26°C/W with 1.0064 in² copper) versus NDH (45°C/W with 4 in² copper), making it preferable for high-power or space-constrained designs.
Does the LM2587T-ADJ include thermal protection?
Yes, the LM2587T-ADJ integrates thermal shutdown that activates at 150°C junction temperature. Once triggered, the device disables the internal NPN switch and remains latched off until junction temperature falls below the hysteresis threshold (~135°C). This protection is fully internal - no external components are needed. The LM2587T-ADJ also includes undervoltage lockout and cycle-by-cycle current limiting for comprehensive fault coverage.
How does current-mode control improve performance in the LM2587T-ADJ?
Current-mode control in the LM2587T-ADJ enhances line and load transient response by directly sensing switch current and comparing it to the error amplifier output. This architecture provides inherent pulse-by-pulse current limiting, improves rejection of input voltage disturbances, and simplifies loop compensation. As a result, the LM2587T-ADJ achieves tighter output regulation (±4% system tolerance) and faster recovery from load steps compared to voltage-mode alternatives.
LM2587T-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 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:
- 5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2587T-ADJ FAQ
1.How can I place an order for LM2587T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587T-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 LM2587T-ADJ reliable?
The price and inventory of LM2587T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2587T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2587T-ADJ?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587T-ADJ?
LM2587T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587T-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 LM2587T-ADJ?
For technical support, including LM2587T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587T-ADJ requirements.
6.How does Aetrix verify that LM2587T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2587T-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 LM2587T-ADJ meets industry standards.
7.What is the process for return or replacement of LM2587T-ADJ?
All LM2587T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2587T-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 LM2587T-ADJ part is unused and in its original packaging.
Return procedure for LM2587T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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