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Texas Instruments LM2587SX-5.0
- Part No.:
- LM2587SX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2587SX-5.0.pdf
- Description:
- IC REG BOOST FLYBACK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,236
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Product details
Overview
LM2587SX-5.0 from Texas Instruments is a monolithic 5A flyback/boost/forward switching regulator IC with fixed 5.0V output, 100 kHz fixed-frequency oscillator, NPN 5.0A/65V switch, and ±4% system output voltage tolerance over line and load. It operates from 4V to 40V input and is used in isolated DC-DC power supplies for industrial control and telecom interface modules.
For engineers reviewing the LM2587SX-5.0 datasheet, LM2587SX-5.0 pinout, LM2587SX-5.0 application, or LM2587SX-5.0 equivalent, key selection criteria include its integrated current-mode control, internal soft-start, undervoltage lockout (3.30V threshold), thermal shutdown, and compatibility with standard flyback transformers such as Coilcraft Q4435-B and Schott 67141450.
Technical Context
The LM2587SX-5.0 implements current-mode PWM control with cycle-by-cycle current limiting, using an internal 1.23V reference and error amplifier to regulate output via feedback pin voltage. Its 100 kHz oscillator enables compact magnetics design and supports stable operation across wide input (4–40V) and junction temperature (−40°C to +125°C) ranges.
Protection architecture includes undervoltage lockout (3.05–3.75V), thermal shutdown at 150°C, and internal current limit (5.0–9.5A). The NPN switch exhibits 0.7V typical saturation voltage at 5.0A and sustains up to 65V, enabling robust flyback and boost topologies without external high-voltage transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over full operating range - ensures stable logic supply for microcontrollers and sensors. |
| Switch Current Limit | 5.0A minimum, 9.5A maximum - defines peak primary-side current handling in flyback designs. |
| Oscillator Frequency | 100 kHz ±15% - sets transformer size and EMI profile; enables use of low-cost, standardized magnetics. |
| Input Voltage Range | 4V to 40V - supports wide-input industrial and automotive battery-fed systems. |
| UVLO Threshold | 3.30V typical (3.05–3.75V) - prevents erratic startup during brownout or cold-cranking conditions. |
| Efficiency | 80% at VIN = 12V, ILOAD = 750mA - delivers usable power density without forced cooling in TO-263 package. |
| Junction Temp Range | −40°C to +125°C - qualified for extended-temperature industrial and transportation applications. |
Pinout & Package
LM2587SX-5.0 is housed in a 5-lead TO-263 (S) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 1 is Input (VIN), Pin 2 is Ground (GND), Pin 3 is Feedback (FB), Pin 4 is Output Switch (SW), and Pin 5 is Compensation (COMP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power input | Accepts 4–40V unregulated DC; feeds internal bias and switch driver circuits. |
| 2 (GND) | Ground reference | Common return for control circuitry, feedback network, and thermal pad connection. |
| 3 (FB) | Feedback input | Monitors output via resistor divider; compares to internal 5.0V reference to regulate SW duty cycle. |
| 4 (SW) | NPN collector output | Drives primary winding of flyback transformer or boost inductor; rated for 65V standoff and 5A peak. |
| 5 (COMP) | Error amplifier output | Provides compensation node for loop stability; connects to RC network for phase margin tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response and inherent line/load regulation without external compensation. |
| Internal soft-start | 11.0 μA typical start-up current limits in-rush into input capacitors and prevents output overshoot. |
| Integrated protection | Combines UVLO, thermal shutdown, and cycle-by-cycle current limiting - eliminates need for discrete fault management. |
| System-level output tolerance | ±4% max over line, load, and temperature - meets tight regulation requirements for downstream logic and analog circuitry. |
| Standard magnetics support | Validated with off-the-shelf transformers (e.g., Coilcraft Q4435-B) and inductors (e.g., Schott 67146520) - reduces BOM count and qualification time. |
Applications
| Industrial Power Supply | Telecom Interface Module |
|---|---|
Use Scenario: Isolated 24V-to-5V conversion in programmable logic controller (PLC) backplane power rails. IC Role / Device Role / Timing Role: Flyback regulator core controlling primary-side switch timing and output voltage regulation via feedback loop. Use Value: Delivers regulated 5V/1.45A output with ±4% accuracy while meeting IEC 61000-4 immunity requirements through controlled switching frequency and current-mode stability. | Use Scenario: Dual-output (5V + −12V) power for RS-485 transceiver and line-driver circuitry in base station remote units. IC Role / Device Role / Timing Role: Primary-side controller in coupled-winding flyback topology generating both positive and negative rails from single input. Use Value: Enables compact, transformer-isolated dual-rail generation without secondary-side regulators - reduces component count and board area by 30% vs. discrete solutions. |
| Automotive Body Control | Test Equipment Auxiliary Supply |
Use Scenario: Cold-cranking tolerant 12V-to-5V conversion for body control module microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Boost regulator maintaining 5V output during engine cranking (input dips to 4V–6V). Use Value: UVLO threshold of 3.30V prevents dropout below 4V input; 100 kHz switching allows small input capacitor (100 μF) and avoids AM-band interference. | Use Scenario: Lab-grade 15V-to-5V isolated auxiliary supply for oscilloscope front-end analog signal conditioning. IC Role / Device Role / Timing Role: Flyback regulator providing galvanic isolation and low-noise 5V rail decoupled from main instrument power. Use Value: ±4% output tolerance and 20 mV line/load regulation ensure stable ADC reference and op-amp biasing under varying test loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587T-5.0 | TO-220 (T) package; θJA = 65°C/W (no heatsink) vs. 35°C/W for LM2587SX-5.0 (with 4 in² copper); identical electrical specs. | Requires external heatsink above ~1.2A load; less suitable for space-constrained SMT layouts. | Select LM2587SX-5.0 for surface-mount, thermally demanding, or high-density PCBs; LM2587T-5.0 where through-hole assembly or manual heatsinking is preferred. |
| LM2577-5.0 | Lower 3A switch rating; 50 kHz oscillator; no internal soft-start; ±2% reference tolerance vs. ±4% system tolerance of LM2587SX-5.0. | Limited to lower-power flyback/boost (<1A output); less robust under transient overload or wide input variation. | Choose LM2587SX-5.0 when >1A output, 100 kHz EMI profile, or integrated soft-start/UVLO are required; LM2577-5.0 only for cost-sensitive, low-current legacy designs. |
Compared with LM2587T-5.0 and LM2577-5.0, the LM2587SX-5.0 provides superior thermal performance in SMT form factor and higher current capability with full protection integration - making it the preferred choice for new industrial and telecom power designs requiring ≥1.45A at 5V with minimal external components.
Availability
LM2587SX-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, telecom interface modules, automotive body control units, and test equipment auxiliary supplies requiring stable component supply and long-term production continuity.
Supply support for LM2587SX-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 delivering analog, embedded processing, and power management solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LM2587 series was designed specifically for cost-effective, low-component-count flyback, boost, and forward converter applications - targeting industrial, telecom, and automotive subsystems needing isolated or stepped-up DC-DC conversion without complex controller ICs.
FAQ
What is the maximum output current supported by the LM2587SX-5.0 in flyback configuration?
The LM2587SX-5.0 supports up to 1.45A output current in flyback configuration, as specified in its Electrical Characteristics table under "LM2587-5.0" conditions (VIN = 4V to 12V, ILOAD = 500 mA to 1.45A). This value assumes proper thermal management using the TO-263 package's 35°C/W θJA with 4 in² copper area, and operation within the −40°C to +125°C junction temperature range. Exceeding this load requires external current limiting or derating.
Does the LM2587SX-5.0 require an external feedback resistor network?
No, the LM2587SX-5.0 does not require an external feedback resistor network because it is a fixed-output version with internally trimmed 5.0V regulation. The feedback pin (FB) connects directly to the output via a short trace for sensing; no resistive divider is needed. This simplifies layout and improves accuracy versus adjustable variants like LM2587-ADJ, which rely on external R1/R2 to set VOUT.
Can the LM2587SX-5.0 be used in boost topology, and what are the key constraints?
Yes, the LM2587SX-5.0 can be used in boost topology per TI's Figure 35 application circuit. Key constraints include externally limiting output current to ≤5A (since internal current limit does not protect the full boost path during short-circuit), ensuring input capacitance handles in-rush during soft-start, and selecting an inductor rated for ≥5A DC and appropriate saturation current. Efficiency drops significantly below 4V input due to UVLO activation.
What is the purpose of the COMP pin on the LM2587SX-5.0, and how should it be configured?
The COMP pin on the LM2587SX-5.0 is the error amplifier output, used to connect an external RC compensation network that stabilizes the control loop. Per TI's Application Hints, a typical configuration uses a 2kΩ resistor and 0.47μF capacitor from COMP to GND. This network sets dominant pole location and phase margin - critical for avoiding oscillation in flyback designs with transformer leakage inductance and output capacitance.
How does thermal performance differ between LM2587SX-5.0 and LM2587T-5.0 packages?
The LM2587SX-5.0 (TO-263/S) achieves θJA = 35°C/W with 4 in² copper area, while the LM2587T-5.0 (TO-220/T) achieves θJA = 65°C/W with same copper - a 46% thermal resistance reduction. This allows LM2587SX-5.0 to deliver full 1.45A output at +70°C ambient without a heatsink, whereas LM2587T-5.0 requires one above ~1.2A. Both share identical junction-to-case (θJC = 2°C/W) and maximum junction temperature (150°C) ratings.
LM2587SX-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:
- Tape & Reel (TR)
- 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)
LM2587SX-5.0 FAQ
1.How can I place an order for LM2587SX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587SX-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 LM2587SX-5.0 reliable?
The price and inventory of LM2587SX-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 LM2587SX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2587SX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587SX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587SX-5.0?
LM2587SX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587SX-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 LM2587SX-5.0?
For technical support, including LM2587SX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587SX-5.0 requirements.
6.How does Aetrix verify that LM2587SX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2587SX-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 LM2587SX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2587SX-5.0?
All LM2587SX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2587SX-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 LM2587SX-5.0 part is unused and in its original packaging.
Return procedure for LM2587SX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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