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Texas Instruments LM2587T-ADJ/NOPB
- Part No.:
- LM2587T-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2587T-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBCK ADJ 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:541
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Product details
Overview
LM2587T-ADJ/NOPB 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, 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 control and power switch in isolated or non-isolated DC-DC converters for industrial power supplies and battery-powered systems.
For engineers reviewing the LM2587T-ADJ/NOPB datasheet, LM2587T-ADJ/NOPB pinout, LM2587T-ADJ/NOPB application, or LM2587T-ADJ/NOPB equivalent, key selection considerations include its adjustable feedback reference (1.230 V), current-mode control architecture, internal soft-start, undervoltage lockout (3.30 V threshold), thermal shutdown protection, and compatibility with standard flyback transformers and boost inductors.
Technical Context
The LM2587T-ADJ/NOPB implements current-mode PWM control using an internal 100 kHz oscillator and cycle-by-cycle peak current limiting. Its error amplifier compares a resistor-divided output voltage against a precision 1.230 V reference, generating a compensation voltage that modulates switch on-time via a comparator sensing primary-side current.
This architecture delivers improved line and load regulation, inherent stability with minimal external compensation, and robust transient response. The NPN output switch integrates current limit, thermal shutdown, and undervoltage lockout-enabling reliable operation across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Voltage | Adjustable via external resistor divider - enables precise setting of any output ≥1.23 V, e.g., 12 V, 24 V, or 48 V. |
| Switch Current Limit | 6.5 A typical, 5.0 A min - defines maximum peak primary current; output current must be externally limited to ≤5 A in boost mode. |
| Reference Voltage | 1.230 V ±2.2% - high-accuracy feedback threshold enabling tight output regulation (±4% system tolerance). |
| Switching Frequency | 100 kHz ±15% - fixed frequency enables predictable EMI filtering and use of compact magnetics. |
| UVLO Threshold | 3.30 V ±0.7 V - prevents erratic startup during brownout; hysteresis ensures clean turn-on above 3.75 V. |
| Thermal Shutdown | 150°C max junction - protects device under overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
LM2587T-ADJ/NOPB is packaged in a 5-pin DDPAK/TO-263 (KTT) thermally enhanced surface-mount package (10.16 mm × 8.42 mm body), optimized for high-power dissipation with low RθJA (26°C/W with 7.4× copper area).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | Power input supply | Accepts 4–40 V DC; connects to bulk input capacitor and current-sense resistor network. |
| Pin 2: Ground | Power and signal reference | Common return for input, output, and internal circuitry; requires low-inductance PCB connection. |
| Pin 3: Feedback | Output voltage sensing | Monitors resistor-divider output; regulates to 1.230 V reference; high-impedance node (125 nA bias). |
| Pin 4: Compensation | Error amplifier output | Drives RC network to set loop bandwidth and phase margin; sinks/sources up to 260 μA. |
| Pin 5: Switch | NPN collector output | Drives transformer primary or boost inductor; withstands 65 V; requires snubber for flyback topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables stable operation with minimal external compensation and inherent cycle-by-cycle current limiting. |
| Internal soft-start | 11 μA soft-start current limits inrush by gradually increasing peak switch current at startup. |
| Integrated protection | Combines undervoltage lockout, thermal shutdown, and current limiting-no external fault management needed. |
| Wide VIN capability | Operates directly from 4 V (e.g., single Li-ion) to 40 V (e.g., 24 V industrial bus), eliminating pre-regulator stages. |
| Standard magnetics support | Validated with Coilcraft, Pulse, and Renco flyback transformers and boost inductors-reduces design risk and time. |
Applications
| Industrial Power Supply | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Generating isolated 12 V and −12 V rails from a 5 V input in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Primary controller and power switch in dual-output flyback converter; regulates both outputs via optocoupler feedback. Use Value: Eliminates need for separate isolated DC-DC modules; achieves ±4% output tolerance across −40°C to +85°C ambient. | Use Scenario: Boosting a depleted 3.2 V LiFePO₄ battery to stable 12 V for powering portable oscilloscope analog front-end circuitry. IC Role / Device Role / Timing Role: Step-up regulator with adjustable feedback; maintains regulated output down to 4 V input via UVLO hysteresis. Use Value: Extends usable battery life by operating down to 4 V input while sustaining 1.2 A load with >80% efficiency. |
| Automotive Aftermarket Lighting | Telecom Remote Unit Power |
Use Scenario: Driving high-brightness LED arrays from a 12 V vehicle battery with variable load and cold-crank transients. IC Role / Device Role / Timing Role: Constant-current boost controller using external sense resistor and feedback scaling; switch pin drives external MOSFET. Use Value: Withstands 40 V load dump pulses; current-mode control rejects input ripple during engine cranking. | Use Scenario: Providing 5 V and 3.3 V outputs from a 24 V PoE-powered remote radio unit in outdoor small-cell base stations. IC Role / Device Role / Timing Role: Primary-side controller in triple-output flyback; regulates 5 V rail directly, derives 3.3 V via LDO. Use Value: Supports multiple output configurations using TI's listed standard transformers (e.g., T3, T4); meets EN 55032 Class B EMI. |
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 |
|---|---|---|---|
| LM2587T-12/NOPB | Fixed 12 V output; no external feedback resistors required; identical pinout, package, and protection features. | Suitable only where 12 V output is acceptable; eliminates resistor divider but lacks flexibility for custom voltages. | Select when system requires fixed 12 V and board space is constrained-no layout change needed. |
| LM2577T-ADJ/NOPB | Lower 3 A switch current rating; 50 kHz switching frequency; same adjustable topology and TO-263 package. | Better suited for lower-power applications (<15 W); larger magnetics required due to halved frequency. | Choose for cost-sensitive, lower-current designs where thermal budget allows larger inductors. |
Compared with LM2587T-12/NOPB, the LM2587T-ADJ/NOPB trades fixed-voltage simplicity for full output flexibility; compared with LM2577T-ADJ/NOPB, it delivers 67% higher output power capability and tighter regulation at higher frequency-critical for space-constrained industrial converters.
Availability
LM2587T-ADJ/NOPB 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, long-term lifecycle support, and traceable sourcing.
Supply support for LM2587T-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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2587 product line was designed specifically for cost-effective, high-reliability flyback, boost, and forward converter applications-targeting engineers who require integrated protection, wide input range, and compatibility with off-the-shelf magnetics.
FAQ
What is the minimum input voltage required for stable operation of the LM2587T-ADJ/NOPB?
The LM2587T-ADJ/NOPB has a guaranteed operating range starting at 4 V, with undervoltage lockout releasing at 3.30 V (typical) and 3.75 V (max). Below 4 V, output regulation degrades and switch current limit may not be maintained. For reliable startup and regulation, maintain VIN ≥4 V across all load and temperature conditions. The LM2587T-ADJ/NOPB datasheet specifies this as a recommended operating rating-not an absolute maximum.
Can the LM2587T-ADJ/NOPB be used in a non-isolated boost configuration?
Yes, the LM2587T-ADJ/NOPB is explicitly validated for non-isolated boost regulator operation per Figure 16 and Section 7.3.1 of the datasheet. It requires only an inductor, Schottky diode, output capacitor, and feedback divider. The internal NPN switch, current-mode control, and 100 kHz oscillator make it ideal for medium-power boost applications up to ~40 W, provided external components are sized for 5 A peak switch current and appropriate thermal management is implemented for the LM2587T-ADJ/NOPB package.
What is the purpose of the Compensation pin (Pin 4) on the LM2587T-ADJ/NOPB?
The Compensation pin (Pin 4) is the output of the internal error amplifier and must be connected to an RC network (typically 1–10 kΩ and 1–10 nF) between Pin 4 and ground. This network sets the loop gain and phase margin of the feedback control system. Proper compensation ensures stable regulation under varying line, load, and temperature conditions. The LM2587T-ADJ/NOPB datasheet provides design equations and example values in Section 8.2.1, and the WEBENCH® Power Designer tool generates optimized networks for specific LM2587T-ADJ/NOPB designs.
How does the LM2587T-ADJ/NOPB handle short-circuit conditions?
Under output short-circuit, the LM2587T-ADJ/NOPB enters hiccup-mode protection: it reduces switching frequency to 25 kHz (short-circuit frequency), limits peak switch current to 5 A, and cycles on/off to limit average power dissipation. This prevents thermal runaway while maintaining detectability of the fault. Recovery is automatic once the short is removed. This behavior is specified in the Electrical Characteristics table (fSC = 25 kHz) and confirmed in functional block diagrams-distinct from continuous current limiting, which applies only during normal regulation.
Is the LM2587T-ADJ/NOPB RoHS-compliant and lead-free?
Yes, the LM2587T-ADJ/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's designation for lead-free, RoHS-compliant packaging). It uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements. The device is qualified for reflow soldering per IPC/JEDEC J-STD-020, with peak temperature up to 260°C for 10 seconds-fully compatible with standard lead-free assembly processes for the LM2587T-ADJ/NOPB.
LM2587T-ADJ/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:
- 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/NOPB FAQ
1.How can I place an order for LM2587T-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587T-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 LM2587T-ADJ/NOPB reliable?
The price and inventory of LM2587T-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 LM2587T-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2587T-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587T-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587T-ADJ/NOPB?
LM2587T-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587T-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 LM2587T-ADJ/NOPB?
For technical support, including LM2587T-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587T-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2587T-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2587T-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 LM2587T-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2587T-ADJ/NOPB?
All LM2587T-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2587T-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 LM2587T-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2587T-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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