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Texas Instruments LM2587T-5.0
- Part No.:
- LM2587T-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2587T-5.0.pdf
- Description:
- IC REG BST FLYBACK 5V 5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,066
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Product details
Overview
LM2587T-5.0 from Texas Instruments is a monolithic 5A flyback/boost regulator IC with fixed 5.0V output, integrated 5.0A/65V NPN switch, 100 kHz fixed-frequency oscillator, and internal soft-start. It delivers ±4% system output voltage tolerance over line and load, supports 4V–40V input, and is used in isolated DC-DC power supplies for industrial control and telecom interface modules.
For engineers reviewing the LM2587T-5.0 datasheet, LM2587T-5.0 pinout, LM2587T-5.0 application, or LM2587T-5.0 equivalent, key selection criteria include its 5.0A switch current rating, 65V switch standoff voltage, thermal shutdown protection, current-mode control architecture, and compatibility with standard flyback transformers such as Coilcraft Q4435-B and Renco RL-5530.
Technical Context
The LM2587T-5.0 implements current-mode PWM control with cycle-by-cycle current limiting, using an internal error amplifier (transconductance = 0.750 mmho, gain = 165 V/V) referenced to a 5.0V internal feedback node. Its 100 kHz oscillator enables compact magnetics design and ensures stable operation across −40°C to +125°C junction temperature.
Protection functions include undervoltage lockout (3.30V threshold), thermal shutdown, and switch current limiting (5.0A typical). The device operates in flyback, boost, or forward topologies without external compensation components beyond the standard RC network on the COMP pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over full line/load/temperature range - guarantees stable logic supply rail without external feedback resistors. |
| Switch Current | 5.0A continuous - supports up to 1.45A output current in boost configuration and higher in flyback with proper transformer turns ratio. |
| Input Voltage Range | 4V to 40V - enables direct operation from 5V, 12V, or 24V industrial bus rails without pre-regulation. |
| Oscillator Frequency | 100 kHz ±15% - balances efficiency and EMI while allowing use of low-cost, standardized 22 µH inductors or flyback transformers. |
| Switch Breakdown Voltage | 65V - accommodates reflected flyback voltages and transient spikes in 24V-input systems with margin. |
| Thermal Shutdown Threshold | 150°C junction - prevents latch-up during overload or poor heatsinking; automatic recovery after cooldown. |
| Efficiency | 80% at VIN = 12V, IOUT = 750 mA - reflects real-world performance with standard external components (e.g., 1N5820 diode, 680 µF output cap). |
Pinout & Package
LM2587T-5.0 is housed in a 5-lead TO-220 (T package) with vertical mounting and bent, staggered leads. Thermal resistance is 65°C/W (no heatsink) or 45°C/W (with 4 in² copper area), requiring external heatsinking above ~2W dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input Supply | Primary DC input connection (4V–40V); decoupled with ≥100 µF electrolytic + 0.1 µF ceramic. |
| GND | Power Ground | Common return for input capacitor, output rectifier cathode, and control circuitry; must be low-impedance. |
| SW | Switch Collector | Drives primary winding of flyback transformer or boost inductor; connects to NPN switch collector (65V rating). |
| COMP | Error Amp Output | Compensation node for loop stability; requires RC network (e.g., 2 kΩ + 0.47 µF) per Figure 6. |
| FB | Feedback Input | Monitors regulated 5.0V output via internal resistor divider; no external resistors needed for fixed-output version. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0A/65V NPN switch | Eliminates need for external high-current transistor and associated drive circuitry in flyback/boost designs. |
| Current-mode PWM control | Provides inherent line and load regulation, fast transient response, and simplified loop compensation. |
| Internal soft-start | Reduces inrush current during startup by gradually increasing duty cycle - prevents input rail sag and stress on input capacitors. |
| System-level ±4% output tolerance | Guaranteed over full operating conditions - removes need for post-production trimming or external voltage monitoring. |
| Undervoltage lockout (UVLO) | 3.30V threshold with 0.7V hysteresis - ensures clean start-up only when input is sufficient to sustain regulation. |
Applications
| Industrial Power Supplies | Telecom Interface Modules |
|---|---|
Use Scenario: Isolated 5V supply for PLC I/O modules powered from 24V DC field bus. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology, regulating isolated 5V rail for microcontroller and sensor interfaces. Use Value: Enables compact, transformer-isolated 5V generation with built-in current limiting and thermal protection - reduces BOM count by 4 components vs discrete switch solution. |
Use Scenario: Boost converter generating 5V from 3.3V backplane in optical line card. IC Role / Device Role / Timing Role: Step-up regulator providing stable 5V for Ethernet PHY and management MCU. Use Value: Delivers 750 mA at 80% efficiency using single inductor and Schottky diode - avoids need for dual-rail LDO or additional buck converter. |
| Automotive Body Control Units | Medical Diagnostic Equipment |
Use Scenario: 5V auxiliary rail in 12V automotive body control module with cold-crank support down to 4.5V. IC Role / Device Role / Timing Role: Input-tolerant boost/flyback controller maintaining 5V during engine cranking transients. Use Value: UVLO (3.3V) and wide 4V–40V input ensure uninterrupted operation during battery dips - critical for CAN communication integrity. |
Use Scenario: Isolated 5V supply for patient-connected analog front-end in portable ultrasound device. IC Role / Device Role / Timing Role: Flyback controller driving reinforced-isolation transformer to meet IEC 60601 creepage/clearance requirements. Use Value: Fixed 5.0V output eliminates feedback resistor drift concerns - improves long-term calibration stability of ADC reference rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587S-5.0 | Same electrical specs, but in TO-263 (S package) with lower θJA (26°C/W with 7.4 in² copper) - no through-hole mounting. | Better thermal performance in surface-mount designs; requires PCB layout revision for footprint and heatsinking. | Select LM2587S-5.0 for SMT production or space-constrained layouts where thermal margin is critical. |
| UC3844BD1G | Current-mode PWM controller IC only - requires external MOSFET, gate driver, and feedback network; no integrated switch or fixed 5V reference. | Greater design flexibility (adjustable frequency, output voltage) but increases component count and loop compensation complexity. | Choose UC3844BD1G only when variable output or >5A switch current is required - not a drop-in replacement. |
Compared with LM2587S-5.0, the LM2587T-5.0 offers identical regulation performance but requires through-hole assembly and larger heatsinking; compared with UC3844BD1G, it trades configurability for integration, reducing design time and failure points in fixed-5V applications.
Availability
LM2587T-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface modules, automotive body control units, and medical diagnostic equipment requiring stable component supply and long-lifecycle support.
Supply support for LM2587T-5.0 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 ICs and high-reliability industrial solutions.
The LM2587 series was designed specifically for cost-sensitive, medium-power isolated and non-isolated DC-DC conversion in industrial, telecom, and automotive applications - emphasizing simplicity, robustness, and minimal external component count.
FAQ
What is the maximum output current achievable with the LM2587T-5.0 in a flyback configuration?
The LM2587T-5.0 supports up to 1.45A output current in boost mode per datasheet test conditions (VIN = 12V, ILOAD = 750 mA, η = 80%). In flyback configurations, output current depends on transformer turns ratio, duty cycle, and thermal limits - typical designs achieve 1.8A at 5V using Coilcraft Q4435-B with adequate heatsinking. The internal 5.0A switch current limit sets the upper bound, but practical output is constrained by efficiency and junction temperature.
Does the LM2587T-5.0 require external feedback resistors to set the 5V output?
No, the LM2587T-5.0 does not require external feedback resistors. It integrates an internal resistor divider that references the FB pin to a precise 5.0V output - confirmed in the LM2587-5.0 Electrical Characteristics table (VOUT = 5.0V, VREF = 5.0V measured at FB). External resistors are only needed for the adjustable (LM2587-ADJ) variant.
Can the LM2587T-5.0 operate from a 3.3V input source?
No, the LM2587T-5.0 cannot operate from 3.3V. Its absolute minimum input voltage is 4V, and undervoltage lockout activates below 3.30V (with 0.7V hysteresis). Attempting to power it from 3.3V will prevent startup and may cause erratic behavior. For 3.3V input, consider a dedicated low-VIN boost controller such as TPS61088.
What is the purpose of the COMP pin on the LM2587T-5.0, and how is it configured?
The COMP pin is the error amplifier output used for loop compensation. It requires an external RC network (e.g., 2 kΩ + 0.47 µF as shown in Figure 6) to stabilize the control loop and prevent oscillation. This network sets dominant pole frequency and phase margin - omitting it results in unstable regulation or audible switching noise. The LM2587T-5.0's current-mode architecture simplifies compensation versus voltage-mode controllers.
Is the LM2587T-5.0 RoHS compliant and lead-free?
Yes, the LM2587T-5.0 is RoHS compliant and lead-free. Texas Instruments confirms RoHS compliance for all LM2587 variants in the official product folder (SNVS115C, Rev February 2010), with lead-free finish on TO-220 package terminals and halogen-free molding compound. Full compliance documentation is available via TI's Quality & Environmental page.
LM2587T-5.0 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:
- 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 FAQ
1.How can I place an order for LM2587T-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587T-5.0 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 reliable?
The price and inventory of LM2587T-5.0 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 is usually 5 days.
3.What payment methods are accepted for LM2587T-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587T-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587T-5.0?
LM2587T-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587T-5.0 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?
For technical support, including LM2587T-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587T-5.0 requirements.
6.How does Aetrix verify that LM2587T-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2587T-5.0 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 meets industry standards.
7.What is the process for return or replacement of LM2587T-5.0?
All LM2587T-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2587T-5.0, 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 part is unused and in its original packaging.
Return procedure for LM2587T-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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