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Texas Instruments LM2595SX-3.3/NOPB
- Part No.:
- LM2595SX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595SX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,711
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Product details
Overview
LM2595SX-3.3/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous buck DC-DC converter delivering 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 thermal/current-limit protection. It serves as a primary step-down regulator in industrial power supplies and embedded system rails.
For engineers reviewing the LM2595SX-3.3/NOPB datasheet, LM2595SX-3.3/NOPB pinout, LM2595SX-3.3/NOPB application, or LM2595SX-3.3/NOPB equivalent, key selection criteria include verified 3.3-V fixed output accuracy, TO-263-5 package thermal performance, TTL-compatible ON/OFF control, and confirmed 78% efficiency at 12-VIN/1-AOUT.
Technical Context
The LM2595SX-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation operating at a fixed 150-kHz switching frequency. Its feedback loop uses a precision 1.23-V reference to regulate output via external resistor divider (not required for fixed 3.3-V version), enabling stable operation with minimal external components.
It implements two-stage current limiting and thermal shutdown for fault protection, and supports logic-level shutdown with 85-μA standby current. The device operates across –40°C to +125°C junction temperature and requires only four external components: input capacitor, output capacitor, catch diode, and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable microcontroller core rail without external feedback resistors. |
| Max Output Current | 1 A DC - supports single-board computers, FPGA I/O banks, and sensor interface modules without derating at 50°C ambient. |
| Input Voltage Range | 4.5 V to 40 V - accommodates 12-V and 24-V industrial bus inputs with margin for transients. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, standard 100–220-μH shielded inductors with minimal EMI filtering. |
| Efficiency | 78% at VIN = 12 V, IOUT = 1 A - reduces thermal load vs. linear regulators, eliminating need for heatsink below 50°C ambient. |
| Standby Current | 85 μA typical - enables low-power sleep modes in battery-backed systems and IoT edge nodes. |
| Thermal Shutdown | Active at TJ ≥ 150°C - protects against sustained overload or poor PCB copper area without external circuitry. |
Pinout & Package
LM2595SX-3.3/NOPB is housed in a TO-263-5 (KTT) thermally enhanced surface-mount package measuring 10.16 mm × 8.42 mm, with exposed thermal pad for direct PCB copper connection to improve heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal Power Switch Drain | Swings between (VIN − VSAT) and ~−0.5 V; requires minimal PCB copper area to reduce EMI coupling into sensitive analog circuits. |
| 2 - +VIN | Positive Input Supply | Accepts 4.5–40 V; must be bypassed with low-ESR capacitor placed adjacent to pin to supply high di/dt switching current. |
| 3 - Ground | Power and Signal Reference | Common return path for input/output capacitors, catch diode, and feedback network; connects to thermal pad for thermal conduction. |
| 4 - Feedback | Output Voltage Sense Input | Internally tied to 3.3-V regulation; unused on fixed-output variant but must remain unconnected per datasheet guidance. |
| 5 - ON/OFF | TTL-Compatible Enable Control | Pull ≤1.3 V to enable; pull ≥1.3 V to enter 85-μA standby; open or grounded for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V Output | Eliminates external feedback resistors and associated layout sensitivity, reducing BOM count and improving production yield. |
| 150-kHz Fixed Oscillator | Enables predictable EMI profile and simplifies filter design using off-the-shelf inductors instead of custom magnetics. |
| TTL Shutdown Interface | Allows direct connection to microcontroller GPIO without level-shifting, supporting dynamic power sequencing in multi-rail systems. |
| Integrated Protection | Combines current-limit foldback and thermal shutdown to prevent damage during short-circuit or inadequate heatsinking conditions. |
| TO-263-5 Thermal Pad | Provides low RθJA of 30°C/W with 2.5 in² 1-oz copper - enables 1-A operation without external heatsink at ≤50°C ambient. |
Applications
| Industrial PLC I/O Module | Embedded Microcontroller Power Rail |
|---|---|
Use Scenario: Providing clean 3.3-V supply to digital I/O drivers and isolation interfaces in programmable logic controllers operating from 24-V DC field buses. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24-V bus to stable 3.3-V logic rail with fast transient response to load steps from solenoid activation. Use Value: Delivers 1-A continuous current with <±4% regulation, eliminating need for post-regulation LDOs and reducing board space by 30% vs. linear solution. | Use Scenario: Powering ARM Cortex-M4 microcontrollers and peripheral interfaces in battery-powered edge sensors with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Main system regulator enabling deep-sleep mode via TTL ON/OFF control synchronized to MCU wake events. Use Value: Achieves 85-μA quiescent current in shutdown while maintaining fast 100-μs startup time - extends battery life by >2× versus non-shutdown alternatives. |
| Automotive Body Control Unit | Point-of-Load Converter for FPGA I/O Banks |
Use Scenario: Generating 3.3-V supply for CAN transceivers and LIN interface ICs in under-hood ECUs exposed to 40-V load-dump transients. IC Role / Device Role / Timing Role: Robust pre-regulator accepting up to 40-V input, feeding downstream LDOs with sufficient headroom for ripple rejection. Use Value: Withstands 40-V max input and includes thermal shutdown - meets ISO 7637-2 pulse 5a requirements without external TVS clamping. | Use Scenario: Delivering 3.3-V power to Xilinx Artix-7 FPGA I/O banks requiring tight voltage tolerance and low noise in test equipment. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter minimizing heat near thermally sensitive analog sections. Use Value: 78% efficiency at 1-A load reduces thermal gradient across PCB, preventing FPGA timing skew caused by localized heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2595T-3.3 | TO-220-5 package; higher RθJA (50°C/W) requires heatsink above 0.5 A at 50°C ambient. | Suitable for prototyping or low-volume through-hole assembly; less suitable for high-density SMT production. | Select LM2595T-3.3 only when manual soldering or mechanical mounting constraints prohibit surface-mount packages. |
| MP1584EN-LF-Z | 380-kHz switching frequency; 3-A rating; requires external compensation; no integrated thermal shutdown. | Better suited for compact designs needing higher current or smaller inductors, but demands more design validation effort. | Choose MP1584EN-LF-Z only when 3-A output or 380-kHz EMI profile is mandatory; LM2595SX-3.3/NOPB offers simpler qualification path for industrial safety-critical use. |
Compared with LM2595T-3.3, LM2595SX-3.3/NOPB provides superior thermal performance in SMT layouts and eliminates heatsink dependency. Against MP1584EN-LF-Z, it trades higher current capability for built-in protection, faster time-to-market, and proven reliability in long-lifecycle industrial deployments.
Availability
LM2595SX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive body electronics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2595SX-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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of industrial-grade product experience.
The LM2595 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for cost-sensitive, high-reliability DC-DC conversion in industrial, automotive, and communications infrastructure where ease of use and robustness outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2595SX-3.3/NOPB?
The absolute maximum input voltage for LM2595SX-3.3/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Operation at 40 V is fully specified across temperature and load conditions, making it suitable for 24-V industrial systems with load-dump transients. Exceeding 40 V risks violating recommended operating conditions and may impact long-term reliability even if within absolute maximum ratings.
Does LM2595SX-3.3/NOPB require external feedback resistors?
No, LM2595SX-3.3/NOPB does not require external feedback resistors because it is the fixed 3.3-V output variant. The feedback node is internally connected to the 3.3-V regulation circuitry. The Feedback pin (Pin 4) must remain unconnected per TI's datasheet guidance - connecting it externally would disrupt regulation and cause output voltage error.
What thermal performance can be expected from LM2595SX-3.3/NOPB in a standard PCB layout?
With a 2.5 in² area of 1-oz copper connected to the TO-263-5 thermal pad, LM2595SX-3.3/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 30°C/W. At 1-A load and 12-V input, this allows full-rated operation up to 50°C ambient temperature without a heatsink. Performance degrades to ~35°C ambient with only 0.5 in² copper, necessitating thermal relief measures.
How does the ON/OFF pin function on LM2595SX-3.3/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: pulling it ≤1.3 V (vs. ground) enables regulation; pulling it ≥1.3 V disables the switcher and reduces total input current to 85 μA typical. If unused, the pin may be left open or tied to ground - both configurations default to enabled operation. The pin tolerates up to 25 V, allowing direct connection to 3.3-V or 5-V logic without level shifters.
Is LM2595SX-3.3/NOPB RoHS-compliant and lead-free?
Yes, LM2595SX-3.3/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free" per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards, with peak reflow temperature up to 260°C.
LM2595SX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2595SX-3.3/NOPB FAQ
1.How can I place an order for LM2595SX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595SX-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 LM2595SX-3.3/NOPB reliable?
The price and inventory of LM2595SX-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 LM2595SX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595SX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595SX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595SX-3.3/NOPB?
LM2595SX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595SX-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 LM2595SX-3.3/NOPB?
For technical support, including LM2595SX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595SX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2595SX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595SX-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 LM2595SX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595SX-3.3/NOPB?
All LM2595SX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595SX-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 LM2595SX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2595SX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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