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Texas Instruments LM2595T-3.3/NOPB
- Part No.:
- LM2595T-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2595T-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:318
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Product details
Overview
LM2595T-3.3/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 1 A output current with fixed 3.3-V output, ±4% output voltage tolerance over line and load, 4.5–40 V input range, and integrated thermal shutdown and current-limit protection. It serves as a primary buck regulator in industrial power supplies and embedded system rails.
For engineers reviewing the LM2595T-3.3/NOPB datasheet, LM2595T-3.3/NOPB pinout, LM2595T-3.3/NOPB application, or LM2595T-3.3/NOPB equivalent, key selection criteria include its TO-220-5 package thermal performance, TTL-compatible ON/OFF control, 85 μA standby current, and compatibility with standard off-the-shelf inductors for rapid design implementation.
Technical Context
The LM2595T-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single IC. Its fixed 150-kHz oscillator enables compact LC filter design, while the nonsynchronous architecture uses an external catch diode for cost-effective 1-A buck conversion.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads; feedback is via a resistive divider connected to the FB pin, with regulation accuracy maintained across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (ensures stable microcontroller I/O rail under full line/load/temperature) |
| Max Output Current | 1 A DC (supports single-board computers, FPGA core rails, and sensor modules) |
| Input Voltage Range | 4.5 V to 40 V (accepts 12-V/24-V industrial bus, automotive battery, or unregulated AC-DC outputs) |
| Switching Frequency | 150 kHz ±15% (enables use of low-cost, high-saturation-current 33–100 μH inductors) |
| Standby Quiescent Current | 85 μA typical (minimizes battery drain in always-on monitoring systems) |
| Thermal Shutdown Threshold | 150°C junction (protects against sustained overload or poor heatsinking in enclosed enclosures) |
| Oscillator Accuracy | ±15% (permits predictable ripple frequency for EMI filtering without trimming) |
Pinout & Package
LM2595T-3.3/NOPB is supplied in a 5-pin TO-220 package with tab-connected ground, optimized for through-hole mounting and heatsink attachment. The package measures 14.986 mm × 10.16 mm and features industry-standard lead bend options for vertical or horizontal PCB orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal Power Switch Drain | Swings between VIN–VSAT (~VIN–1.2 V) and ~–0.5 V; requires minimal copper area to reduce EMI coupling |
| 2 - +VIN | Main Input Supply | Accepts 4.5–40 V; must be bypassed with low-ESR capacitor near pin to supply pulsed switch current |
| 3 - Ground | Power and Signal Reference | Internally connected to metal tab; serves as thermal path and return for all internal circuits |
| 4 - Feedback | Voltage Sense Input | Monitors regulated 3.3 V output directly (no resistor divider needed); 1.23 V reference internally |
| 5 - ON/OFF | TTL-Compatible Enable | Pull ≤1.3 V to enable; pull ≥1.3 V to enter 85 μA standby; open or grounded = enabled |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Thermal Shutdown | Automatically disables switching at 150°C junction, preventing permanent damage during transient overloads |
| Two-Stage Current Limit | Clamps peak switch current to ~1.5 A at 25°C, then reduces frequency under sustained overload to limit power dissipation |
| Fixed-Frequency Operation | 150-kHz clock eliminates need for external timing components and simplifies EMI compliance testing |
| Low External Component Count | Requires only one inductor, one catch diode, and two capacitors-reducing BOM cost and layout complexity |
| Wide Input Voltage Range | Supports direct connection to 12-V/24-V/36-V industrial buses without pre-regulation stages |
Applications
| Industrial PLC Power Rail | Embedded Microcontroller Supply |
|---|---|
Use Scenario: Providing clean, regulated 3.3-V power to ARM Cortex-M7-based controllers in programmable logic controllers operating in 0–70°C ambient environments. IC Role / Device Role / Timing Role: Primary buck regulator converting 24-V DC field bus to 3.3-V logic rail with tight line/load regulation and low ripple. Use Value: Delivers 1 A continuously with <±4% output tolerance, eliminating need for post-regulation LDOs and reducing board space. | Use Scenario: Powering Wi-Fi SoCs and sensor interfaces in battery-backed IoT edge nodes where standby current impacts battery life. IC Role / Device Role / Timing Role: Main system regulator enabling deep-sleep modes via TTL-controlled ON/OFF pin. Use Value: 85 μA standby current extends coin-cell battery life beyond 12 months in periodic wake-up applications. |
| Automotive Body Control Module | Test Equipment Auxiliary Supply |
Use Scenario: Generating 3.3-V supply for CAN transceivers and microcontrollers in 12-V automotive body electronics exposed to cold-crank (4.5 V) and load-dump (40 V) conditions. IC Role / Device Role / Timing Role: Robust front-end buck converter handling wide-input transients without external protection circuitry. Use Value: Operates across full 4.5–40 V range with built-in overvoltage and thermal protection-reducing system-level safety validation effort. | Use Scenario: On-board 3.3-V rail for digital logic and ADC references in portable benchtop test instruments requiring stable, low-noise supply. IC Role / Device Role / Timing Role: High-efficiency preregulator feeding low-noise linear regulators for analog signal chains. Use Value: 78% efficiency at 12-V input/1-A load minimizes heat generation in sealed instrument enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2595SX-3.3/NOPB | Same electrical specs, but in surface-mount TO-263-5 package; 30°C/W RθJA with 2.5 in² copper vs. 50°C/W for TO-220 | Better suited for automated SMT assembly and higher-power density layouts; requires reflow-compatible PCB design | Select when board space is constrained and thermal management uses large copper pours instead of heatsinks |
| LM2678-3.3/NOPB | Higher 63-V max input, 5-A output, 260-kHz switching, and synchronous rectification; larger TO-220-7 package | Targets higher-current applications (e.g., motor drivers, multi-rail systems); not drop-in due to pinout and control differences | Choose when >1 A output or wider input range is required; redesign of feedback and layout mandatory |
Compared with LM2595T-3.3/NOPB, the LM2595SX-3.3/NOPB offers identical regulation performance in a smaller footprint with superior thermal resistance on SMT boards, while the LM2678-3.3/NOPB provides higher current and input voltage capability at the cost of increased complexity and non-interchangeable pinout.
Availability
LM2595T-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded computing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2595T-3.3/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 specializing in analog and embedded processing technologies, with leadership in power management ICs since the 1970s.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for cost-sensitive, medium-power DC-DC conversion in industrial, automotive, and consumer applications where ease of use and reliability are prioritized over ultra-high efficiency or digital control.
FAQ
What is the maximum input voltage rating for LM2595T-3.3/NOPB?
The absolute maximum input voltage for LM2595T-3.3/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Exceeding 40 V may trigger internal protection or degrade long-term reliability; operation at 40 V is validated across temperature and load conditions per the datasheet's Recommended Operating Conditions table.
Does LM2595T-3.3/NOPB require an external feedback resistor network?
No, LM2595T-3.3/NOPB does not require external feedback resistors because it is a fixed-output version with internal voltage reference and divider. The FB pin connects directly to the 3.3-V output; only the adjustable versions (e.g., LM2595ADJ) require external resistors to set VOUT.
Can LM2595T-3.3/NOPB be used in a negative-output (inverting) configuration?
Yes, LM2595T-3.3/NOPB can be configured as a negative-output inverter by bootstrapping the GND pin to the output node and grounding the FB pin. This topology generates –3.3 V from a positive input, but requires additional diodes and careful startup current management per Figure 18 in the datasheet.
What thermal derating applies to LM2595T-3.3/NOPB in TO-220 package without a heatsink?
In free-air conditions with no heatsink, LM2595T-3.3/NOPB is rated for full 1-A output only below 50°C ambient. Above that, output current must be reduced per the thermal derating curve in Section 7.4; with 1 in² of 1-oz copper, RθJA is 50°C/W, limiting continuous 1-A operation to ~70°C ambient before reaching 125°C junction temperature.
Is LM2595T-3.3/NOPB RoHS-compliant and lead-free?
Yes, LM2595T-3.3/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for lead-free reflow soldering profiles.
LM2595T-3.3/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2595T-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595T-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2595T-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595T-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595T-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595T-3.3/NOPB?
LM2595T-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595T-3.3/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-3.3/NOPB?
For technical support, including LM2595T-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595T-3.3/NOPB requirements.
6.How does Aetrix verify that LM2595T-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595T-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595T-3.3/NOPB?
All LM2595T-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595T-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2595T-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2595T-3.3/NOPB Tags
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