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Texas Instruments LM2595T-ADJ/NOPB
- Part No.:
- LM2595T-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2595T-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,289
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Product details
Overview
LM2595T-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC delivering up to 1 A output current, supporting adjustable output voltages from 1.2 V to 37 V (±4% tolerance), operating at a fixed 150-kHz switching frequency, with input voltage range up to 40 V and thermal/current-limit protection - used in board-level power conversion for industrial control and embedded systems.
For engineers reviewing the LM2595T-ADJ/NOPB datasheet, LM2595T-ADJ/NOPB pinout, LM2595T-ADJ/NOPB application, or LM2595T-ADJ/NOPB equivalent, key selection criteria include feedback voltage accuracy (1.23 V typ), ON/OFF logic threshold (1.3 V), standby current (85 μA typ), saturation voltage (1.2 V max at 1 A), and TO-220 package thermal performance (RθJA = 50°C/W on 1-in² PCB).
Technical Context
The LM2595T-ADJ/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single TO-220-5 package. It operates in continuous conduction mode by default, supports discontinuous mode at light loads, and uses external feedback resistors to set output voltage via a precision 1.23-V reference at the Feedback pin.
Its functional architecture includes TTL-compatible ON/OFF control with 1.3-V threshold, self-protection via two-stage current limiting and thermal shutdown, and fixed-frequency oscillator with ±15% tolerance (110–173 kHz over temperature). No external compensation network is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A DC maximum - supports mid-power point-of-load regulation without external current boosting. |
| Input voltage range | 4.5 V to 40 V - enables direct operation from unregulated 12-V, 24-V, or 36-V rails with margin. |
| Feedback voltage | 1.23 V (typ), ±4% over temp - sets output via resistor divider; determines absolute output accuracy and load/line regulation capability. |
| Switching frequency | 150 kHz (typ), 110–173 kHz over temp - enables use of low-cost, standard inductors (e.g., 68–100 µH) with minimal EMI filtering. |
| Saturation voltage | 1.2 V max at 1 A - defines conduction loss in internal NPN switch; impacts efficiency at high duty cycles and low VIN/VOUT ratios. |
| Standby current | 85 µA typ at shutdown - enables ultra-low-power system sleep modes without auxiliary LDOs. |
| Oscillator tolerance | ±15% - constrains filter design margin and affects ripple frequency predictability in noise-sensitive applications. |
Pinout & Package
LM2595T-ADJ/NOPB is supplied in a 5-pin TO-220 package (NDH variant), with exposed tab electrically connected to Pin 3 (Ground) for thermal and electrical grounding. Mounting requires mechanical fastening and thermal interface to heatsink or copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Switch node | Connects to cathode of catch diode and inductor; voltage swings between (VIN − VSAT) and ≈ –0.5 V; requires minimal PCB copper area to reduce EMI coupling. |
| 2 - +VIN | Power input | Accepts 4.5–40 V DC; requires low-ESR bypass capacitor placed adjacent to pin to supply pulsed switch current and suppress transients. |
| 3 - Ground | Reference and thermal path | Common return for all internal circuits; tab connection provides primary thermal conduction path to heatsink or PCB copper. |
| 4 - Feedback | Voltage sense input | Monitors output via resistor divider; regulates output by comparing to 1.23-V internal reference; bias current ≤50 nA minimizes divider error. |
| 5 - ON/OFF | Logic enable/disable | TTL-compatible control: <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 |
|---|---|
| Adjustable output range | 1.2 V to 37 V via two-resistor feedback network - eliminates need for multiple fixed-output SKUs in variable-voltage designs. |
| Integrated protection | Thermal shutdown + two-stage current limiting - prevents damage during overload, short-circuit, or inadequate heatsinking without external circuitry. |
| Low-component-count design | Requires only 4 external parts (inductor, diode, input/output capacitors) - reduces BOM cost, layout area, and qualification effort. |
| Fixed-frequency operation | 150-kHz internal oscillator - simplifies EMI filtering and avoids subharmonic instability seen in variable-frequency controllers. |
| High-efficiency conversion | Up to 90% efficiency (e.g., 12-V → 5-V @ 1 A) - reduces thermal load and enables compact, fanless enclosures in industrial environments. |
Applications
| Industrial Power Supply | Embedded System Core Rail |
|---|---|
|
Use Scenario: Converting 24-V factory bus to 3.3-V or 5-V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, regulated core voltage with line/load regulation < ±1%. Use Value: Eliminates need for external current-sense or compensation components while maintaining 1-A capability across –40°C to +125°C junction range. |
Use Scenario: Generating 1.8-V or adjustable rail for FPGA or microcontroller cores in edge-computing gateways. IC Role / Device Role / Timing Role: Adjustable step-down converter enabling flexible voltage scaling without redesigning power stage. Use Value: 1.23-V feedback reference and ±4% output tolerance ensure reliable digital logic operation under varying load and temperature. |
| Positive-to-Negative Converter | Preregulator for Linear Regulators |
|
Use Scenario: Generating –5-V or –12-V from +12-V input for op-amp biasing or analog signal conditioning. IC Role / Device Role / Timing Role: Inverting buck-boost topology using ground-referenced feedback and bootstrapped ground pin. Use Value: Enables bipolar supplies with single-input source; ON/OFF pin retains shutdown control even in inverted configuration with level-shifting. |
Use Scenario: Reducing 24-V industrial input to ~7-V before LDO for clean 5-V analog subsystems. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing power dissipation and heat generation in linear post-regulation stages. Use Value: 150-kHz switching allows small, low-cost inductors; 85-µA standby current preserves system-level low-power states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-ADJ | Higher peak current limit (3 A vs. 1.5 A), lower dropout (1.5 V vs. 2.5 V), same 150-kHz frequency and TO-220-5 package. | Better suited for higher-current loads (>1 A) or lower-input-voltage applications (e.g., 7-V input); requires revised inductor and diode ratings. | Select LM2596-ADJ when output current exceeds 1 A or input voltage falls below 7 V; verify thermal derating with new RθJA. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller solution size, but requires external compensation and lacks integrated thermal shutdown. | Preferred for space-constrained designs where PCB area is critical; not drop-in due to different pinout, feedback scheme, and protection architecture. | Choose MP1584EN-LF-Z only when footprint reduction justifies redesign effort and added external component count. |
Compared with LM2595T-ADJ/NOPB, LM2596-ADJ offers higher current headroom and lower dropout at identical pinout and control logic, while MP1584EN-LF-Z trades integration and protection for frequency-scaling benefits - making LM2595T-ADJ/NOPB optimal for cost-sensitive, thermally robust 1-A industrial buck applications requiring minimal external parts.
Availability
LM2595T-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and power management applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2595T-ADJ/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, specializing in analog, embedded processing, and power management technologies with broad industrial and automotive reach.
The LM2595 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically 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/NOPB to regulate a 3.3-V output?
The LM2595T-ADJ/NOPB requires a minimum input voltage of approximately 5.8 V to sustain 3.3-V output at full 1-A load, accounting for its typical 1.2-V saturation voltage and feedback headroom. At lighter loads, regulation may begin near 4.5 V per datasheet recommended operating conditions - but stable operation at full load demands sufficient VIN–VOUT margin for switch conduction and loop stability.
Can LM2595T-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2595T-ADJ/NOPB supports inverting regulator topologies by reconfiguring the ground and feedback connections per Figure 18 in the datasheet. The device regulates the negative output by bootstrapping its ground pin to the output rail and referencing feedback to system ground - enabling –3.3 V, –5 V, or other negative voltages with appropriate external diodes and layout isolation.
What is the purpose of the ON/OFF pin on LM2595T-ADJ/NOPB, and how is it interfaced?
The ON/OFF pin on LM2595T-ADJ/NOPB enables logic-controlled enable/disable: pulling below 1.3 V (e.g., to GND) turns the regulator ON; pulling above 1.3 V (up to 25 V) places it in low-quiescent standby (85 µA typ). It accepts direct MCU GPIO drive or open-collector signals - no pull-up required, and floating defaults to ON state.
Does LM2595T-ADJ/NOPB require external compensation components?
No, LM2595T-ADJ/NOPB includes internal frequency compensation optimized for standard buck configurations with typical output capacitors (e.g., 22–220 µF tantalum or low-ESR electrolytic). External compensation is neither specified nor recommended - adding it may destabilize the control loop or degrade transient response.
How does thermal performance differ between TO-220 and TO-263 packages for LM2595T-ADJ/NOPB?
LM2595T-ADJ/NOPB in TO-220 (NDH) achieves RθJA = 50°C/W on a 1-in² PCB with 1-oz copper, while the TO-263 (KTT) version achieves 30°C/W under identical conditions. The TO-220's larger body and exposed tab offer superior thermal conduction to heatsinks, whereas TO-263 relies more on PCB copper area - making TO-220 preferable for high-ambient or high-power industrial deployments.
LM2595T-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2595T-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595T-ADJ/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 LM2595T-ADJ/NOPB reliable?
The price and inventory of LM2595T-ADJ/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595T-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595T-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595T-ADJ/NOPB?
LM2595T-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595T-ADJ/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 LM2595T-ADJ/NOPB?
For technical support, including LM2595T-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595T-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2595T-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595T-ADJ/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 LM2595T-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595T-ADJ/NOPB?
All LM2595T-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595T-ADJ/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 LM2595T-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2595T-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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