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Texas Instruments LM2587T-5.0/NOPB
- Part No.:
- LM2587T-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2587T-5.0/NOPB.pdf
- Description:
- IC REG BST FLYBACK 5V 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
LM2587T-5.0/NOPB from Texas Instruments is a monolithic 5-A step-up (boost) and flyback switching regulator IC with fixed 5-V output, 4–40-V input range, 100-kHz fixed-frequency oscillator, NPN internal switch rated for 65-V standoff and 5-A peak current, and ±4% system output voltage tolerance over line and load. It serves as the core power conversion controller in isolated or non-isolated DC-DC converters for industrial power supplies and battery-powered systems.
For engineers reviewing the LM2587T-5.0/NOPB datasheet, LM2587T-5.0/NOPB pinout, LM2587T-5.0/NOPB application, or LM2587T-5.0/NOPB equivalent, key selection considerations include its fixed 5-V output configuration, TO-220-5 package thermal performance (RθJA = 65°C/W), current-mode control architecture for transient rejection, integrated soft-start, and undervoltage lockout at 3.3 V.
Technical Context
The LM2587T-5.0/NOPB implements current-mode PWM control with an internal 100-kHz oscillator, using cycle-by-cycle peak current limiting to regulate output voltage by modulating switch on-time. Its error amplifier compares feedback voltage against a precision 5.0-V internal reference (±1.5% initial tolerance), generating a compensation signal that interfaces with a transconductance amplifier (GM = 0.75 mmho typ) and comparator.
Operation supports both boost and flyback topologies: in boost mode, it regulates output > input using external inductor/diode; in flyback mode, it drives a transformer primary with energy transfer to secondary windings. Protection includes thermal shutdown, undervoltage lockout (3.3 V threshold), and internal current limit (6.5 A typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable logic supply without external resistor divider. |
| Input Voltage Range | 4 V to 40 V - supports wide-range inputs including 5-V USB-PD, 12-V automotive, and 24-V industrial rails. |
| Switch Current Limit | 6.5 A typical (5.0–9.5 A min/max) - sets maximum peak inductor current to prevent saturation and enable robust overload handling. |
| Oscillator Frequency | 100 kHz (75–125 kHz over temp) - enables use of low-cost, high-saturation-current magnetics while balancing EMI and efficiency. |
| Efficiency | 80% at 12-V input, 750-mA load - reflects real-world conversion performance with standard external components per Figure 61. |
| Thermal Shutdown | Activates at 150°C junction temperature - protects device during sustained overload or inadequate heatsinking. |
| Soft-Start Current | 11.0 μA typical - controls ramp rate of internal compensation node to limit inrush current during startup. |
Pinout & Package
LM2587T-5.0/NOPB is housed in a 5-pin TO-220 (NDH) package with exposed tab for thermal conduction. The tab is electrically connected to Pin 2 (Ground). Mounting requires insulating hardware if heatsink is grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | Power input connection | Accepts 4–40 V DC; must be decoupled with ≥100 μF low-ESR capacitor near pin to suppress ripple and support peak current demands. |
| Pin 2: Ground | Circuit common reference | Internal ground node tied to exposed tab; serves as return path for switch, error amp, and oscillator - requires low-impedance PCB copper pour. |
| Pin 3: Feedback | Output voltage sensing input | Monitors regulated 5-V output via internal 5.0-V reference; open for fixed-output operation - no external resistors needed. |
| Pin 4: Compensation | Error amplifier output | Provides access to transconductance amplifier output for external loop compensation (e.g., RC network) to stabilize control loop. |
| Pin 5: Switch | NPN transistor collector | Drives external inductor (boost) or transformer primary (flyback); switches at 100 kHz with 65-V standoff capability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output configuration | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% regulation accuracy. |
| Current-mode PWM control | Enables fast transient response, inherent cycle-by-cycle current limiting, and simplified loop compensation versus voltage-mode designs. |
| Integrated soft-start | Reduces input inrush current by gradually increasing switch duty cycle - prevents tripping upstream fuses or causing input rail sag. |
| 5-A NPN power switch with 65-V rating | Supports high-power boost/flyback designs up to ~60 W without external MOSFET, simplifying thermal design with TO-220 package. |
| Undervoltage lockout (UVLO) | Disables operation below 3.3 V input, preventing erratic startup or brownout-induced instability in battery-fed systems. |
Applications
| Industrial Power Supply | Automotive Auxiliary Rail |
|---|---|
|
Use Scenario: Generating isolated 5-V logic supply from 12-V vehicle battery in telematics modules, where input may dip to 6 V during cranking. IC Role / Device Role / Timing Role: Flyback controller regulating primary-side switch timing to maintain constant 5-V output across wide input transients. Use Value: Delivers ±4% output stability despite 6–16-V input variation and meets automotive thermal limits using TO-220 with minimal heatsink. |
Use Scenario: Boosting 5-V USB-C PD source to 5-V/2-A rail for embedded microcontroller subsystems requiring noise-isolated power. IC Role / Device Role / Timing Role: Step-up regulator operating in continuous conduction mode with 100-kHz fixed-frequency switching. Use Value: Achieves 80% efficiency at 750-mA load with no external feedback components, reducing board space and qualification effort. |
| Medical Sensor Hub | Factory Automation I/O Module |
|
Use Scenario: Providing clean, isolated 5-V supply for analog front-end sensors in portable diagnostic devices powered by single-cell Li-ion (3–4.2 V). IC Role / Device Role / Timing Role: Boost converter stepping up battery voltage with current-mode control to reject load-induced noise on sensitive analog rails. Use Value: Maintains regulation down to 4-V input and integrates thermal shutdown to protect against overheating in sealed enclosures. |
Use Scenario: Generating auxiliary 5-V rail from 24-V PLC backplane to power digital isolators and level-shifters in modular I/O cards. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology delivering multiple isolated outputs including 5-V logic and ±12-V analog rails. Use Value: Enables compact multi-output design using standard transformers (e.g., Coilcraft Q4437-B) listed in TI's selection guide. |
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 |
|---|---|---|---|
| LM2587T-ADJ/NOPB | Adjustable output (1.23 V reference); requires external resistor divider; same 5-A switch and 100-kHz oscillator. | Supports custom output voltages (e.g., 3.3 V, 12 V); less suitable for cost-sensitive 5-V-only designs due to added components. | Select when output flexibility outweighs BOM simplicity; verify loop stability with chosen feedback network. |
| LM2577T-5.0/NOPB | Lower 3-A switch current rating; 50-kHz oscillator; different pinout (no dedicated COMP pin); ±2% output tolerance. | Better suited for lower-power (<25 W) boost applications; lacks flyback-optimized features like enhanced UVLO hysteresis. | Choose for simpler, lower-cost designs where 3-A peak current suffices and 50-kHz EMI profile is preferred. |
Compared with LM2587T-5.0/NOPB, LM2587T-ADJ/NOPB trades fixed-output simplicity for design flexibility, while LM2577T-5.0/NOPB reduces power capability and control granularity to achieve lower system cost and EMI - all three share TO-220 packaging but differ in thermal derating, protection thresholds, and loop interface options.
Availability
LM2587T-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive auxiliary rails, and medical sensor hubs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2587T-5.0/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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM2587 series was developed specifically for cost-effective, high-reliability flyback, boost, and forward converter applications in industrial, automotive, and medical equipment - emphasizing minimal external component count and robust protection features.
FAQ
What topology does the LM2587T-5.0/NOPB support?
The LM2587T-5.0/NOPB supports boost (step-up), flyback, and forward converter topologies. Its internal 5-A NPN switch, 65-V standoff rating, and current-mode control architecture make it especially well-suited for flyback designs requiring isolation. In boost mode, it regulates output voltages greater than the input; in flyback mode, it drives transformer primaries to generate one or more isolated outputs. The LM2587T-5.0/NOPB datasheet provides reference schematics for both configurations.
Does the LM2587T-5.0/NOPB require external feedback resistors?
No, the LM2587T-5.0/NOPB does not require external feedback resistors because it integrates a precise 5.0-V reference and internal resistor divider for fixed-output operation. Pin 3 (Feedback) is internally connected to this network and left unconnected in standard applications. This eliminates tuning errors, reduces component count, and improves long-term output stability compared to adjustable versions like the LM2587T-ADJ/NOPB, which require two external resistors to set VOUT.
What is the maximum output power achievable with LM2587T-5.0/NOPB?
Maximum practical output power for LM2587T-5.0/NOPB is approximately 60 W in flyback configuration with adequate heatsinking, based on its 5-A switch current limit, 100-kHz switching frequency, and TO-220 thermal resistance (RθJA = 65°C/W). In boost mode, output power is limited by input voltage, inductor saturation, and diode losses - typical validated designs deliver 25–40 W. Real-world power depends on PCB layout, heatsink area, ambient temperature, and external component selection per TI's Application Reports.
How does the soft-start function operate in LM2587T-5.0/NOPB?
The LM2587T-5.0/NOPB implements soft-start by sourcing a constant 11.0 μA (typ) current into the Compensation (COMP) pin during startup, causing the error amplifier output voltage to ramp linearly. This gradually increases the PWM duty cycle, limiting inrush current into the output capacitor and preventing input rail collapse or overstress on external diodes and inductors. Soft-start duration is determined by the external RC network on the COMP pin; default operation uses only the internal current source with no external capacitor required.
Is LM2587T-5.0/NOPB RoHS compliant and lead-free?
Yes, LM2587T-5.0/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per Texas Instruments' product nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements and is qualified for reflow soldering with peak temperatures up to 260°C. Full compliance documentation, including material declarations and test reports, is available through TI's Quality & Environmental Information portal.
LM2587T-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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):
- 5V
- Voltage - Output (Max):
- -
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2587T-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587T-5.0/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 LM2587T-5.0/NOPB reliable?
The price and inventory of LM2587T-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2587T-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2587T-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587T-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587T-5.0/NOPB?
LM2587T-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587T-5.0/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 LM2587T-5.0/NOPB?
For technical support, including LM2587T-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587T-5.0/NOPB requirements.
6.How does Aetrix verify that LM2587T-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2587T-5.0/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 LM2587T-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2587T-5.0/NOPB?
All LM2587T-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2587T-5.0/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 LM2587T-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2587T-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2587T-5.0/NOPB Tags
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