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LM2587SX-ADJ
Texas Instruments
IC REG MULT CONFIG ADJ 5A DDPAK
880277 Pcs New Original In Stock
Boost, Flyback, Forward Converter Switching Regulator IC Positive Adjustable 1.23V 1 Output 5A (Switch) TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
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5.0 / 5.0
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LM2587SX-ADJ
Product Overview
1318840
DiGi Electronics Part Number
LM2587SX-ADJ-DGManufacturer
Texas Instruments
LM2587SX-ADJ
Description
IC REG MULT CONFIG ADJ 5A DDPAKInventory
880277 Pcs New Original In Stock
Boost, Flyback, Forward Converter Switching Regulator IC Positive Adjustable 1.23V 1 Output 5A (Switch) TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Quantity
Minimum 1
Minimum 1
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LM2587SX-ADJ Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
Cut Tape (CT) & Digi-Reel®
Series
SIMPLE SWITCHER®
Product Status
Last Time Buy
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)
Mounting Type
Surface Mount
Package / Case
TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package
TO-263 (DDPAK-5)
Base Product Number
LM2587
Datasheet & Documents
Manufacturer Product Page
LM2587SX-ADJ Specifications
HTML Datasheet
LM2587SX-ADJ-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM2587SX-ADJTR
LM2587SXADJ
LM2587SX-ADJCT
LM2587SX-ADJDKR
Standard Package
500
Alternative Parts
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MANUFACTURER
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
我很喜歡DiGi Electronics的快速出貨，讓我能迅速使用到心儀的商品，非常感謝！
de desembre 02, 2025
Ich fühle mich bei meinem Einkauf immer wertgeschätzt, dank des freundlichen Teams.
de desembre 02, 2025
After-sales support has been outstanding, promptly addressing any concerns I had.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the LM2587SX-ADJ in a high-input-voltage boost converter application above 30V, and how can I mitigate them?
When designing with the LM2587SX-ADJ in boost configurations above 30V input, the primary risks include excessive switch stress, increased switching losses at 100kHz, and potential thermal runaway due to higher conduction and switching losses in the internal power transistor. The device’s 5A switch current limit and 40V max input rating leave minimal margin for transient spikes. To mitigate, use a robust input filter with low-ESR capacitors and a TVS diode to clamp transients, ensure adequate PCB copper area under the DDPAK-5 package for heat dissipation, and consider derating the output current by 20–30% above 30V input. Additionally, verify layout minimizes high-di/dt loops to reduce EMI and voltage ringing that could exceed the 60V output max.
Can I replace the LM2587SX-ADJ with a more modern synchronous boost controller like the TPS61088, and what trade-offs should I expect in a 12V-to-36V, 3A design?
Replacing the LM2587SX-ADJ with a synchronous controller such as the TPS61088 is feasible and offers higher efficiency (up to 95% vs. ~80% for LM2587SX-ADJ) and smaller magnetics due to its 1.2MHz switching frequency. However, this substitution introduces complexity: the TPS61088 requires external MOSFETs and more precise feedback compensation, increasing BOM count and layout sensitivity. The LM2587SX-ADJ’s integrated switch simplifies design and reduces EMI concerns in noise-sensitive environments. If board space and efficiency are critical, the TPS61088 is superior, but for rugged, low-part-count designs with moderate efficiency needs, the LM2587SX-ADJ remains a reliable choice—especially given its proven robustness in industrial applications.
How does the LM2587SX-ADJ’s lack of synchronous rectification impact thermal performance in a 5A flyback converter operating at light loads, and what design adjustments are recommended?
The LM2587SX-ADJ uses an internal bipolar switch without synchronous rectification, leading to significant conduction losses (Vce(sat) ~1.5V) that dominate at light loads in flyback topologies, where duty cycle is low but peak currents remain high. This results in poor light-load efficiency and elevated junction temperatures even when output power is minimal. To address this, implement a burst-mode or diode-emulation control scheme if your controller supports it—though the LM2587SX-ADJ lacks this feature natively—so instead, optimize the transformer turns ratio to reduce peak currents and use a Schottky catch diode with ultra-low forward voltage. Also, ensure the PCB thermal pad is properly soldered to a large ground plane with multiple vias to maintain TJ below 125°C under all load conditions.
Given that the LM2587SX-ADJ is in Last Time Buy status, what long-term reliability risks should I consider for new product designs, and are there pin-compatible drop-in replacements?
The LM2587SX-ADJ’s Last Time Buy status poses serious supply chain and longevity risks for new designs—once inventory depletes, sourcing authentic parts becomes difficult, increasing exposure to counterfeit components. While the LM2587SX-ADJ/NOPB (RoHS-compliant variant) is functionally identical, it shares the same obsolescence timeline. There is no true pin-compatible drop-in replacement, but the LM2596HVS-ADJ (also from TI) offers similar functionality with a 60V input rating and 3A switch current in a TO-263-7 package; however, it requires external compensation and has different pinout. For future-proofing, consider migrating to newer SIMPLE SWITCHER® parts like the LM5155 (flyback/boost controller) with digital configuration and better efficiency, even if it demands a redesign.
What layout practices are critical when using the LM2587SX-ADJ in a forward converter topology to avoid instability and excessive EMI, especially with long feedback traces?
In forward converter applications, the LM2587SX-ADJ is sensitive to noise coupling through long feedback traces, which can cause output oscillation or false triggering due to the 100kHz switching edge rates. Keep the feedback (FB) trace short, routed away from the inductor, switch node, and input traces, and use a ground guard ring if necessary. Place the feedback resistor divider as close as possible to the FB pin and connect it directly to the output capacitor’s ground terminal to avoid ground bounce errors. Additionally, minimize the loop area of the high-current path (input cap → IC → inductor → output cap) by using a compact, star-ground layout. A poor layout can induce >100mV ripple on the 1.23V reference, leading to output inaccuracy—always validate stability with a transient load test and spectrum analysis if EMI compliance is required.
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LM2587SX-ADJ CAD Models
Texas Instruments LM2587SX-ADJ PCB symbols & footprints
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