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Texas Instruments LM2587S-5.0
- Part No.:
- LM2587S-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2587S-5.0.pdf
- Description:
- IC REG BOOST FLYBACK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
LM2587S-5.0 from Texas Instruments is a monolithic 5-A step-up (boost) and flyback switching regulator IC with fixed 5.0-V output, 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 primary power conversion controller in isolated or non-isolated DC-DC converters for industrial power supplies and battery-backed systems.
For engineers reviewing the LM2587S-5.0 datasheet, LM2587S-5.0 pinout, LM2587S-5.0 application, or LM2587S-5.0 equivalent, key selection considerations include its fixed 5-V output configuration, TO-263 (DDPAK) thermal performance, current-mode control architecture, internal soft-start, and undervoltage lockout-critical for reliable start-up in wide-input-voltage industrial environments.
Technical Context
The LM2587S-5.0 implements current-mode control using an internal 100-kHz oscillator and cycle-by-cycle peak current limiting, enabling stable regulation under fast load transients and variable input conditions. Its error amplifier compares feedback voltage against a precision 5.0-V reference (measured at FB pin), generating a compensation signal that modulates switch duty cycle via PWM comparator.
It integrates a 5-A NPN power switch with thermal shutdown, undervoltage lockout (UVLO threshold 3.3 V), and switch saturation voltage of 0.7 V (typ) at 5 A. The device supports both boost and flyback topologies without external gate drivers, relying on transformer coupling or diode-based energy transfer depending on configuration.
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 rail without external resistor divider. |
| Input Voltage Range | 4 V to 40 V-supports wide-range inputs including 5-V USB-PD sources, 12-V automotive, and 24-V industrial rails. |
| Switch Current Limit | 5.0 A (typ), 6.5 A (min)-defines maximum peak inductor current; requires external current limiting in boost mode to prevent switch overstress. |
| Switching Frequency | 100 kHz (±15%)-enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| UVLO Threshold | 3.30 V (typ), 3.05–3.75 V range-prevents erratic startup below minimum operating voltage; hysteresis ensures clean turn-on. |
| Efficiency | 80% (typ) at 12-V input, 750-mA load-achieved with low RCE(sat) (0.7 V) and optimized control loop dynamics. |
| Junction Temp Range | −40°C to +125°C-validated for extended temperature operation in uncooled industrial enclosures. |
Pinout & Package
LM2587S-5.0 is packaged in a thermally enhanced 5-pin DDPAK/TO-263 (KTT) package (10.16 mm × 8.42 mm body), with exposed metal tab electrically connected to Pin 2 (Ground) for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | Power Input | Connects to unregulated DC source (4–40 V); requires local 100-μF low-ESR input capacitor for stability. |
| Pin 2: Ground | Power & Signal Reference | Common return for input, output, and internal circuitry; must be tied directly to large copper pour for thermal and noise control. |
| Pin 3: Feedback | Voltage Sense Input | Monitors regulated output via resistive divider; internally references 5.0-V bandgap-no external resistor needed for fixed-output version. |
| Pin 4: Compensation | Error Amplifier Output | Provides access to internal error amp output; external RC network sets loop bandwidth and phase margin. |
| Pin 5: Switch | NPN Collector Output | Drives primary winding (flyback) or inductor (boost); switches between VIN and ground; requires snubber or clamp diode in flyback. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5-A NPN switch | Eliminates external transistor and driver; 65-V standoff enables 48-V system compatibility with margin. |
| Current-mode control | Improves transient response and line/load regulation; simplifies loop compensation vs voltage-mode designs. |
| Internal soft-start | 11-μA soft-start current limits in-rush during power-up, preventing input rail collapse and output overshoot. |
| Thermal shutdown & UVLO | Protects against sustained overload or low-input faults; auto-recovery after fault removal ensures robust field operation. |
| Fixed 5.0-V output | Reduces BOM count by removing feedback resistors; maintains ±4% accuracy across −40°C to +125°C junction temp. |
Applications
| Industrial 5-V Logic Supply | Automotive Auxiliary Power |
|---|---|
Use Scenario: Generating stable 5-V rail from 12-V vehicle battery for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary DC-DC controller in non-isolated boost configuration, regulating output despite cold-crank dips to 6 V. Use Value: Maintains 5-V output within ±4% during 6–16-V input variation and 100-mA to 750-mA load steps-ensuring uninterrupted MCU operation. | Use Scenario: Providing isolated 5-V supply for sensor interface circuits in factory automation PLC modules. IC Role / Device Role / Timing Role: Flyback controller driving custom transformer to deliver galvanically isolated 5-V output from 24-V DC bus. Use Value: Delivers 1.4-A max output at 5 V with inherent isolation, eliminating need for separate isolated DC-DC module and reducing board space. |
| Telecom Backup Power | Portable Test Equipment |
Use Scenario: Stepping up voltage from 3.7-V Li-ion battery to 5-V for USB-powered peripherals during AC failure. IC Role / Device Role / Timing Role: Boost regulator with integrated switch, configured for high-efficiency operation at light loads and full output. Use Value: Achieves 80% efficiency at 750-mA load and maintains regulation down to 4-V input-extending usable battery runtime. | Use Scenario: Generating 5-V rail in handheld test instruments powered by 9-V alkaline batteries. IC Role / Device Role / Timing Role: Fixed-output boost controller enabling compact, low-component-count power stage with minimal layout area. Use Value: Reduces external component count to only inductor, diode, input/output capacitors, and compensation network-cutting BOM cost and assembly steps. |
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-5.0 | Same electrical specs; packaged in TO-220 (NDH) with higher θJA (65°C/W vs 56°C/W) and larger footprint. | Suitable where vertical heatsinking or socket mounting is preferred; less efficient thermal dissipation than DDPAK. | Select LM2587T-5.0 only when mechanical constraints prohibit surface-mount DDPAK or when legacy TO-220 footprint reuse is required. |
| LM2577-5.0 | Lower 3-A switch rating, 50-kHz frequency, no internal soft-start; requires external soft-start circuit for in-rush control. | Better suited for lower-power (<15 W), cost-sensitive applications where size and thermal performance are secondary. | Choose LM2577-5.0 only if output current ≤3 A and thermal budget allows higher junction temperatures. |
Compared with LM2587T-5.0, the LM2587S-5.0 offers superior thermal performance in surface-mount layouts, while LM2577-5.0 trades peak current capability and integrated soft-start for lower system cost at reduced power levels-making LM2587S-5.0 optimal for 5-A, thermally constrained industrial boost/flyback designs.
Availability
LM2587S-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, automotive auxiliary systems, and telecom backup converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2587S-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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2587S-5.0 belongs to TI's legacy switching regulator product line, engineered specifically for cost-effective, high-current DC-DC conversion in flyback and boost topologies-targeting applications where reliability, wide input range, and integrated power switch simplify power design.
FAQ
What is the maximum output current achievable with the LM2587S-5.0 in a boost configuration?
The LM2587S-5.0 features a 5-A internal NPN switch, but output current in boost mode is limited by external components and thermal design. At 12-V input and 5-V output, typical continuous output is 1.45 A (per datasheet Section 6.6). To sustain higher currents, external current limiting and adequate heatsinking of the DDPAK package are mandatory-exceeding 1.45 A risks thermal shutdown or switch failure without careful layout and airflow.
Does the LM2587S-5.0 require external feedback resistors to set the 5-V output?
No. The LM2587S-5.0 is a fixed-output variant with internal resistor divider network tied to the feedback (FB) pin, referencing a precision 5.0-V bandgap. Unlike the adjustable LM2587-ADJ, it requires no external resistors-reducing component count and eliminating resistor tolerance errors that affect output accuracy.
Can the LM2587S-5.0 be used in a flyback topology with multiple outputs?
Yes. The LM2587S-5.0 is explicitly designed for flyback operation, and the datasheet provides reference designs for single-, dual-, and triple-output flyback converters (Figures 22–27). Secondary outputs rely on transformer turns ratios and post-regulation; the 5-V primary output remains tightly regulated via the internal feedback loop, while auxiliary outputs exhibit looser regulation due to cross-regulation effects.
What is the purpose of the Compensation (COMP) pin on the LM2587S-5.0?
Pin 4 (COMP) is the output of the internal error amplifier. It provides access to the control signal driving the PWM comparator. An external RC network connected between COMP and ground sets loop compensation-determining phase margin, bandwidth, and transient response. Incorrect compensation can cause instability or excessive output ripple, so values must be selected per TI's Application Reports (e.g., SNVA559).
How does the LM2587S-5.0 handle input undervoltage conditions?
The LM2587S-5.0 incorporates an undervoltage lockout (UVLO) circuit with a 3.30-V typical turn-on threshold and hysteresis. When input voltage drops below ~3.05 V, the IC disables the internal switch and enters low-current standby mode (11 mA typical IQ). It remains off until VIN rises above ~3.75 V, preventing erratic switching and output instability during brownout events-critical for battery-powered LM2587S-5.0 systems.
LM2587S-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2587S-5.0 FAQ
1.How can I place an order for LM2587S-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587S-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 LM2587S-5.0 reliable?
The price and inventory of LM2587S-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 LM2587S-5.0 is usually 5 days.
3.What payment methods are accepted for LM2587S-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587S-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587S-5.0?
LM2587S-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587S-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 LM2587S-5.0?
For technical support, including LM2587S-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587S-5.0 requirements.
6.How does Aetrix verify that LM2587S-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2587S-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 LM2587S-5.0 meets industry standards.
7.What is the process for return or replacement of LM2587S-5.0?
All LM2587S-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2587S-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 LM2587S-5.0 part is unused and in its original packaging.
Return procedure for LM2587S-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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