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Texas Instruments LM2587SX-5.0/NOPB
- Part No.:
- LM2587SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2587SX-5.0/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,123
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Product details
Overview
LM2587SX-5.0/NOPB 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-powered equipment.
For engineers reviewing the LM2587SX-5.0/NOPB datasheet, LM2587SX-5.0/NOPB pinout, LM2587SX-5.0/NOPB application, or LM2587SX-5.0/NOPB equivalent, key selection considerations include its fixed 5.0 V output configuration, TO-263 (DDPAK) thermal performance, current-mode control architecture, internal soft-start function, and compatibility with standard flyback transformers and boost inductors per TI's recommended component guides.
Technical Context
The LM2587SX-5.0/NOPB implements current-mode PWM control with a fixed 100 kHz oscillator, enabling precise cycle-by-cycle current limiting and improved transient response. Its error amplifier compares feedback voltage against an internal 5.0 V reference (measured at FB pin under regulation), generating a compensation signal that modulates switch on-time via ramp comparison.
Internal protection includes undervoltage lockout (3.3 V threshold), thermal shutdown, and switch current limiting (6.5 A typical, 5.0 A min). The integrated 5-A NPN power transistor supports flyback, boost, and forward topologies without external gate drivers, and operates with minimal external components-typically one diode, one inductor/transformer, and two capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full input (4–40 V) and load range; eliminates need for external resistor divider. |
| Input Voltage Range | 4 V to 40 V DC; supports wide-range inputs including 5 V, 12 V, 24 V, and 36 V battery or bus rails. |
| Switch Current Limit | 5.0 A minimum (6.5 A typical); defines maximum peak inductor/primary current in boost/flyback designs. |
| Switching Frequency | 100 kHz ±15%; enables use of compact magnetics while balancing EMI and efficiency trade-offs. |
| Efficiency | 80% typical at VIN = 12 V, IOUT = 750 mA; reflects real-world performance in boost configuration per Figure 61 test circuit. |
| Thermal Resistance (θJA) | 35 °C/W (DDPAK/TO-263, 0.4896 in² copper); enables 2.5 W continuous dissipation at TA = 70 °C without heatsink. |
| Reference Voltage Accuracy | 4.913 V to 5.088 V (−40 °C to +125 °C); ensures tight output regulation across temperature and load. |
Pinout & Package
LM2587SX-5.0/NOPB is housed in a 5-pin DDPAK/TO-263 (KTT) package with exposed thermal pad for enhanced heat dissipation. Body size is 10.16 mm × 8.42 mm. Pin 1 is marked by a bevelled corner or dot; leads are bent and staggered for through-hole or surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input Supply | Connects to unregulated DC input (4–40 V); bypass capacitor required near pin for stability. |
| Pin 2 (GND) | Power Ground | Common return for input, output, and internal circuits; must tie to thermal pad for optimal thermal performance. |
| Pin 3 (SW) | Switch Collector | Drives transformer primary or boost inductor; connects to cathode of catch diode in boost, primary winding in flyback. |
| Pin 4 (FB) | Feedback Input | Monitors regulated output via resistive divider (not needed for fixed 5.0 V version); internally biased to 5.0 V reference. |
| Pin 5 (COMP) | Error Amplifier Output | Provides compensation node for loop stability; connects to RC network between COMP and GND per design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output configuration | Eliminates external feedback resistors, reduces BOM count, and improves production consistency vs adjustable versions. |
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting, superior line/load transient response, and simplified loop compensation. |
| Internal soft-start | Reduces in-rush current during startup by gradually increasing switch duty cycle; prevents input rail sag and output overshoot. |
| Integrated 5-A/65-V NPN switch | Supports high-power boost and flyback topologies without external transistor; simplifies layout and improves reliability. |
| System-level ±4% output tolerance | Guarantees output accuracy across full operating temperature (−40 °C to +125 °C), input voltage, and load conditions. |
Applications
| Industrial Power Supply | Automotive Auxiliary Power |
|---|---|
|
Use Scenario: Generating stable 5 V rail from 12 V or 24 V vehicle battery for infotainment or telematics modules under cold-crank (6 V) and load-dump (36 V) conditions. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing flyback topology with transformer isolation to meet automotive safety and noise requirements. Use Value: Wide 4–40 V input range accommodates full automotive voltage transients; ±4% output tolerance ensures reliable MCU and sensor operation. |
Use Scenario: Boosting 3.3 V or 5 V logic supply from a low-voltage Li-ion battery (2.7–4.2 V) to power USB peripherals or display backlights in portable medical devices. IC Role / Device Role / Timing Role: Non-isolated step-up (boost) regulator with fixed 5.0 V output and internal 100 kHz oscillator for predictable EMI profile. Use Value: 5 A switch current capability supports up to 2.5 A output at 5 V (assuming 80% efficiency); soft-start prevents battery voltage droop during startup. |
| Telecom Line Card Power | Industrial Sensor Node |
|
Use Scenario: Providing isolated 5 V bias for analog front-end circuitry in telecom line cards powered from −48 V DC distribution bus. IC Role / Device Role / Timing Role: Flyback controller driving center-tapped transformer to generate isolated 5 V output with reinforced insulation. Use Value: 65 V switch standoff safely handles reflected flyback voltages from −48 V input; current-mode control rejects input ripple from noisy telecom bus. |
Use Scenario: Converting 9–36 V DC field power to regulated 5 V for microcontroller, wireless transceiver, and analog sensors in factory automation nodes. IC Role / Device Role / Timing Role: Fixed-output boost regulator with minimal external parts (inductor, diode, caps) for space-constrained PCBs. Use Value: TO-263 package enables direct thermal coupling to copper pour; 35 °C/W θJA allows >2 W continuous output without heatsink at 70 °C ambient. |
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-5.0/NOPB | Same electrical specs but in TO-220 (NDH) package; higher θJA (65 °C/W) requires heatsink above ~1.5 W dissipation. | Preferred where vertical mounting, socket compatibility, or legacy TO-220 footprint is required. | Select LM2587T-5.0/NOPB only if board layout mandates TO-220; otherwise LM2587SX-5.0/NOPB offers superior thermal performance. |
| LM2588MX-5.0/NOPB | Pin-compatible upgrade with 65 V switch, 5 A current limit, and improved efficiency (85% typ.); same 100 kHz frequency and fixed 5 V output. | Offers higher efficiency and better thermal margin in high-load boost applications; identical pinout and footprint. | LM2588MX-5.0/NOPB is a drop-in replacement with measurable efficiency gain; verify transformer/inductor saturation margins due to higher peak current capability. |
Compared with LM2587T-5.0/NOPB, LM2587SX-5.0/NOPB delivers 30 °C/W lower junction-to-ambient thermal resistance, enabling higher continuous output power without heatsinking; compared with LM2588MX-5.0/NOPB, it trades 5% efficiency for proven long-term reliability in cost-sensitive industrial deployments.
Availability
LM2587SX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive auxiliary systems, telecom line cards, and sensor node designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2587SX-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 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-effective, high-reliability flyback, boost, and forward converter applications in industrial and automotive environments where wide input range, integrated power switch, and robust protection features are essential.
FAQ
What is the maximum input voltage rating for LM2587SX-5.0/NOPB?
The absolute maximum input voltage for LM2587SX-5.0/NOPB is 45 V, but the recommended operating range is 4 V to 40 V DC. Operation above 40 V risks exceeding internal switch voltage limits and triggering protection circuits; sustained operation beyond 40 V is not advised per TI's Recommended Operating Ratings.
Does LM2587SX-5.0/NOPB require an external feedback resistor network?
No - LM2587SX-5.0/NOPB is the fixed 5.0 V output variant, so the feedback divider is internal. Pin 4 (FB) is internally connected to the 5.0 V reference and does not require external resistors. This differs from the adjustable LM2587MX-ADJ/NOPB, which requires external R1/R2 to set output voltage.
Can LM2587SX-5.0/NOPB be used in flyback topology with transformer isolation?
Yes - LM2587SX-5.0/NOPB is explicitly qualified for flyback regulator applications per TI's datasheet. Its 65 V switch standoff, current-mode control, and internal soft-start make it suitable for isolated designs; TI provides transformer selection tables and reference schematics (e.g., Figure 22–27) confirming this use case for LM2587SX-5.0/NOPB.
What is the thermal performance difference between LM2587SX-5.0/NOPB and LM2587T-5.0/NOPB?
LM2587SX-5.0/NOPB in DDPAK/TO-263 has θJA = 35 °C/W (with 0.4896 in² copper), while LM2587T-5.0/NOPB in TO-220 has θJA = 65 °C/W (no heatsink). This 30 °C/W difference allows LM2587SX-5.0/NOPB to dissipate ~2.5× more power at the same ambient temperature - critical for high-current boost designs where thermal headroom is constrained.
Is LM2587SX-5.0/NOPB compatible with WEBENCH® Power Designer?
Yes - TI's WEBENCH® Power Designer fully supports LM2587SX-5.0/NOPB for custom boost and flyback designs. Users can enter input/output specifications, select LM2587SX-5.0/NOPB, and generate complete schematics, BOMs, efficiency plots, and thermal simulations - all validated against the official LM2587 electrical characteristics and application notes.
LM2587SX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2587SX-5.0/NOPB FAQ
1.How can I place an order for LM2587SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587SX-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 LM2587SX-5.0/NOPB reliable?
The price and inventory of LM2587SX-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 LM2587SX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2587SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587SX-5.0/NOPB?
LM2587SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587SX-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 LM2587SX-5.0/NOPB?
For technical support, including LM2587SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2587SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2587SX-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 LM2587SX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2587SX-5.0/NOPB?
All LM2587SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2587SX-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 LM2587SX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2587SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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