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Texas Instruments LM2595T-ADJ
- Part No.:
- LM2595T-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2595T-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
LM2595T-ADJ from Texas Instruments is a monolithic 150-kHz nonsynchronous buck DC-DC converter IC designed for step-down voltage regulation in embedded power supplies. It delivers up to 1 A output current, supports adjustable output from 1.2 V to 37 V (±4% tolerance), operates from 4.5 V to 40 V input, and integrates internal frequency compensation and thermal/current protection - used in industrial power rails and point-of-load conversion.
For engineers reviewing the LM2595T-ADJ datasheet, LM2595T-ADJ pinout, LM2595T-ADJ application, or LM2595T-ADJ equivalent, key selection criteria include its fixed 150-kHz switching frequency, ON/OFF logic control with 1.3 V threshold, 85 μA standby current, TO-220-5 package thermal performance, and feedback-based output programming requiring two external resistors.
Technical Context
The LM2595T-ADJ implements a nonsynchronous buck topology with an integrated NPN switch, internal 150-kHz oscillator, and voltage-mode feedback control using a precision 1.23 V reference at the Feedback pin. Its duty cycle is controlled by comparing the scaled output voltage against this reference, enabling stable regulation across line and load variations.
It features TTL-compatible ON/OFF shutdown (active-low logic), thermal shutdown triggered at ~150°C junction temperature, and two-stage current limiting: first-stage foldback and second-stage frequency reduction under overload. No external compensation network is required due to built-in frequency compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A DC maximum - supports mid-power loads without external current boosting |
| Input voltage range | 4.5 V to 40 V - accommodates wide-input industrial and automotive battery-supplied systems |
| Output voltage range | 1.2 V to 37 V adjustable - set via external resistor divider on Feedback pin |
| Feedback reference | 1.23 V ±2% - determines output accuracy; VOUT = 1.23 × (1 + R1/R2) |
| Switching frequency | 150 kHz (±15%) - enables use of low-cost, standard inductors and reduces EMI filtering complexity |
| Standby current | 85 μA typical - enables low-power shutdown mode for energy-sensitive applications |
| Thermal shutdown | Active at ~150°C junction - protects device during sustained overload or poor heatsinking |
Pinout & Package
LM2595T-ADJ is supplied in a 5-pin TO-220 package (NDH variant) with vertical leads and exposed tab for thermal conduction. The package measures 14.986 mm × 10.16 mm and requires no heatsink below 50°C ambient when delivering <12 V outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Switch node | Drives external catch diode and inductor; swings between VIN–VSAT (~VIN–1.2 V) and –0.5 V; PCB copper area must be minimized to reduce EMI coupling |
| 2 (+VIN) | Power input | Accepts 4.5–40 V DC; requires local low-ESR bypass capacitor to supply high di/dt switching current |
| 3 (Ground) | Reference return | Common return for internal circuitry, feedback network, and input/output capacitors; must connect to low-impedance ground plane |
| 4 (Feedback) | Voltage sense input | Monitors regulated output via resistor divider; internal 1.23 V reference sets regulation point; bias current ≤50 nA minimizes divider error |
| 5 (ON/OFF) | Shutdown control | Logic input: <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA when high; can be tied to GND for always-on operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NPN switch | Eliminates need for external high-side transistor; saturation voltage ≤1.2 V at 1 A simplifies thermal design |
| Fixed-frequency oscillator | 150-kHz internal clock enables predictable EMI spectrum and consistent filter component sizing |
| TTL-compatible shutdown | Direct interface with microcontroller GPIO without level-shifting; 85 μA standby current extends battery life |
| Internal compensation | Reduces external component count to just 4: input cap, output cap, inductor, and feedback divider |
| Thermal + current protection | Self-limiting behavior under fault: current foldback + frequency reduction + thermal cutoff prevent destructive failure |
Applications
| Industrial Power Rails | Point-of-Load Conversion |
|---|---|
Use Scenario: Generating stable 5 V or 12 V from 24 V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated DC power to downstream logic and analog circuitry. Use Value: Delivers 1 A at high efficiency (>82% at 12 VIN/5 VOUT) with minimal BOM count and no external compensation. | Use Scenario: Local 3.3 V rail generation on a dense MCU board where space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck converter placed near processor core or memory subsystem. Use Value: Adjustable output allows precise 3.3 V setting; TO-220 package enables direct heatsinking to chassis or PCB copper pour. |
| Positive-to-Negative Converter | Preregulator for Linear Regulators |
Use Scenario: Converting +12 V to –5 V for op-amp dual-rail supplies in instrumentation front-ends. IC Role / Device Role / Timing Role: Inverting buck-boost topology using grounded feedback and bootstrapped ground pin. Use Value: Enables bipolar supply generation with single IC; supports up to 1 A output with proper inductor selection (e.g., 68 µH). | Use Scenario: Reducing 24 V industrial input to 7 V before LDO stage to minimize LDO power dissipation. IC Role / Device Role / Timing Role: High-efficiency preregulator lowering dropout voltage seen by downstream linear regulator. Use Value: Achieves >90% efficiency at 25 VIN/12 VOUT, cutting heat generation vs. direct linear regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ | Higher 150-kHz frequency tolerance (±10%), lower 1.23 V reference drift (±1%), improved load regulation (±0.5% vs ±1%) | Better suited for precision output requirements and tighter line/load regulation specs | Select LM2596T-ADJ when output stability over temperature and load is critical; same pinout and footprint |
| MP1584EN-LF-Z | Sync rectification, higher 1.5-MHz switching frequency, smaller external components, but requires external compensation | Preferred for compact designs needing reduced inductor/capacitor size and higher efficiency at light loads | Choose MP1584EN-LF-Z for space-constrained boards; verify layout compatibility and compensation tuning |
Compared with LM2595T-ADJ, LM2596T-ADJ offers tighter output tolerance and better regulation without changing PCB layout, while MP1584EN-LF-Z enables miniaturization and higher light-load efficiency at the cost of added design complexity.
Availability
LM2595T-ADJ is available at Aetrix Electronics and suitable for industrial automation, embedded power supplies, and point-of-load conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2595T-ADJ 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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in switching regulator design and manufacturing.
The LM2595 series belongs to TI's SIMPLE SWITCHER® family - engineered for ease of use in cost-sensitive, medium-power DC-DC applications where minimal external components and robust protection are essential.
FAQ
What is the minimum input voltage required for LM2595T-ADJ to regulate a 3.3 V output?
The LM2595T-ADJ requires a minimum input voltage of 4.5 V under recommended operating conditions. For a 3.3 V output, this provides sufficient headroom above the dropout-like requirement imposed by the switch saturation voltage (~1.2 V) and feedback overhead. Operation below 4.5 V may result in loss of regulation or intermittent shutdown.
How do I calculate the feedback resistor values for a target output voltage with LM2595T-ADJ?
Use the formula VOUT = 1.23 V × (1 + R1/R2), where R2 is typically 1.2 kΩ (to keep bias current error low), and R1 = R2 × ((VOUT / 1.23) − 1). For example, for 5 V output: R1 = 1200 × ((5 / 1.23) − 1) ≈ 3680 Ω. Standard 1% E96 values like 3.65 kΩ yield 4.99 V output. LM2595T-ADJ's 1.23 V reference has ±2% initial tolerance, so final accuracy depends on resistor tolerances.
Does LM2595T-ADJ require an external compensation network?
No, LM2595T-ADJ includes internal frequency compensation optimized for standard buck configurations with typical external components. No external compensation capacitor or resistor is needed - only four external parts: input capacitor, output capacitor, power inductor, and feedback resistor divider. This simplifies design and improves reliability compared to uncompensated controllers.
Can LM2595T-ADJ be used in a negative-output inverting configuration?
Yes, LM2595T-ADJ supports inverting operation by connecting its Ground pin to the negative output and referencing the Feedback pin to system ground. This configuration generates negative voltages (e.g., –5 V from +12 V) and is documented in TI's LM2595 datasheet Figure 18. Startup current is higher in this mode, so delayed start-up using the ON/OFF pin is recommended for stability.
What thermal considerations apply to LM2595T-ADJ in TO-220 package?
In TO-220 (NDH) package, LM2595T-ADJ has a junction-to-ambient thermal resistance (RθJA) of 50°C/W on a 0.5 in² 1-oz copper PCB. At 1 A load and 12 VIN/5 VOUT, power dissipation is ~1.2 W - resulting in ~60°C rise above ambient. No heatsink is needed below 50°C ambient for outputs <12 V; above that, a small heatsink or increased copper area is advised to maintain TJ <125°C.
LM2595T-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2595T-ADJ FAQ
1.How can I place an order for LM2595T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595T-ADJ 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 LM2595T-ADJ reliable?
The price and inventory of LM2595T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2595T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595T-ADJ?
LM2595T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595T-ADJ 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 LM2595T-ADJ?
For technical support, including LM2595T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595T-ADJ requirements.
6.How does Aetrix verify that LM2595T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2595T-ADJ 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 LM2595T-ADJ meets industry standards.
7.What is the process for return or replacement of LM2595T-ADJ?
All LM2595T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2595T-ADJ, 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 LM2595T-ADJ part is unused and in its original packaging.
Return procedure for LM2595T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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