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LM2591HVT-ADJ
Texas Instruments
IC REG BUCK ADJ 1A TO220-5
2269 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.2V 1 Output 1A TO-220-5 Formed Leads
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5.0 / 5.0
- (343 Ratings)
LM2591HVT-ADJ
Product Overview
1278255
DiGi Electronics Part Number
LM2591HVT-ADJ-DGManufacturer
Texas Instruments
LM2591HVT-ADJ
Description
IC REG BUCK ADJ 1A TO220-5Inventory
2269 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.2V 1 Output 1A TO-220-5 Formed Leads
Quantity
Minimum 1
Minimum 1
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LM2591HVT-ADJ Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
-
Series
SIMPLE SWITCHER®
Product Status
Obsolete
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
4.5V
Voltage - Input (Max)
60V
Voltage - Output (Min/Fixed)
1.2V
Voltage - Output (Max)
57V
Current - Output
1A
Frequency - Switching
150kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Through Hole
Package / Case
TO-220-5 Formed Leads
Supplier Device Package
TO-220-5
Base Product Number
LM2591
Datasheet & Documents
HTML Datasheet
LM2591HVT-ADJ-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
45
Alternative Parts
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MANUFACTURER
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Les options de tri et de filtrage sont très utiles pour personnaliser mes recherches.
de desembre 02, 2025
手厚いサポートに感動しました。価格も非常にリーズナブルです。
de desembre 02, 2025
Der Service nach dem Kauf bei DiGi Electronics ist schnell und effizient. Die Produktqualität ist unübertroffen.
de desembre 02, 2025
They prioritize prompt shipping without compromising on packaging quality.
de desembre 02, 2025
Their logistics system is highly organized, making tracking very convenient.
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Frequently Asked Questions (FAQ)
Can I use the LM2591HVT-ADJ to replace an older LM2576T-ADJ in a 48V to 12V, 800mA industrial power supply design, and what layout or thermal risks should I anticipate?
While the LM2591HVT-ADJ is electrically similar to the LM2576T-ADJ—both being 1A, adjustable buck regulators with wide input ranges—the LM2591HVT-ADJ operates at a higher switching frequency (150kHz vs. 52kHz), which reduces inductor size but increases switching losses and EMI. Direct pin-for-pin replacement may work, but you must verify inductor saturation current and ensure the new layout minimizes high-di/dt loops. Due to its TO-220-5 package and lack of synchronous rectification, thermal performance under continuous 1A load at high ambient temperatures (>50°C) requires a properly sized heatsink. Also, note that the LM2591HVT-ADJ is marked obsolete by Texas Instruments, so long-term supply risk should be evaluated before committing to redesigns.
What are the critical design constraints when using the LM2591HVT-ADJ in a battery-powered application with input voltages dropping below 6V, such as a 24V nominal system experiencing deep discharge to 5V?
The LM2591HVT-ADJ has a minimum input voltage of 4.5V, but it requires headroom above the output voltage to maintain regulation—typically at least 1.5V. If your output is set to 3.3V or higher, the input must stay above ~4.8V for stable operation. Below that, the regulator may dropout or oscillate. In battery systems prone to deep discharge (e.g., lead-acid or aged Li-ion), consider adding undervoltage lockout (UVLO) circuitry using a comparator or supervisory IC to disable the LM2591HVT-ADJ before input collapse. Also, ensure your feedback divider network uses low-leakage resistors to avoid output drift during low-input conditions.
How does the LM2591HVT-ADJ compare to the modern TPS54360DDAR for a 60V input, 5V/1A output application in terms of efficiency, board space, and long-term reliability?
The LM2591HVT-ADJ is a legacy non-synchronous buck converter with ~75–80% efficiency at 60V→5V/1A, while the TPS54360DDAR (a synchronous buck from TI) achieves 88–92% under the same conditions due to reduced conduction losses. The TPS54360 also integrates FETs, uses a smaller SOIC-8 package, and supports higher switching frequencies (up to 2.5MHz), enabling compact designs. However, the LM2591HVT-ADJ’s through-hole TO-220-5 package offers superior mechanical robustness and easier manual assembly or repair in harsh environments. For new designs, the TPS54360 is preferable for efficiency and size, but if you're maintaining legacy hardware or need field-replaceable modules, the LM2591HVT-ADJ remains viable—though its obsolete status makes it a risky long-term choice.
Is it safe to parallel two LM2591HVT-ADJ devices to increase output current beyond 1A in a high-reliability industrial controller, and what derating or balancing techniques are required?
Paralleling LM2591HVT-ADJ regulators is not recommended without active current sharing, as minor differences in feedback thresholds, layout parasitics, and thermal coupling cause significant current imbalance—potentially overloading one device. Even with matched resistors and symmetrical PCB layout, the lack of built-in current-sharing features means one unit may carry >70% of the load. If higher current is needed, consider a single higher-rated regulator like the LM2593HV (2A) or migrate to a modern solution such as the LM5145. If you must parallel, add small ballast resistors (0.1–0.2Ω, 2W) in series with each output and ensure tight thermal coupling, but expect reduced overall efficiency and increased failure risk under transient loads.
Given that the LM2591HVT-ADJ is obsolete and RoHS non-compliant, what are the best drop-in or functionally equivalent replacements for a medical device already in production, and how should I validate them?
The closest direct replacement is the LM2591HVT-ADJ/NOPB, which is the RoHS-compliant version of the same device and often available from authorized distributors despite the base part’s obsolete status. Functionally, it matches the original in pinout, electrical specs, and thermal behavior. For a more future-proof alternative, evaluate the LM2594HVMA-ADJ (0.5A, same pinout) if your load allows derating, or redesign with the LM2671 (also SIMPLE SWITCHER®, 1A, 260kHz). Always perform full validation: test line/load regulation from 4.5V to 60V input, transient response with 10–100% load steps, thermal imaging under worst-case ambient, and long-term burn-in. Since medical devices require strict change control, document all substitutions per ISO 13485 and consider dual-sourcing strategies to mitigate supply chain risk.
Quality Assurance (QC)
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LM2591HVT-ADJ CAD Models
Texas Instruments LM2591HVT-ADJ PCB symbols & footprints
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