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Texas Instruments LM2595SX-12/NOPB
- Part No.:
- LM2595SX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595SX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:921
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Product details
Overview
LM2595SX-12/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering up to 1 A output current with fixed 12-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 an efficient on-card switching regulator in industrial power supplies and embedded systems requiring stable mid-power conversion.
For engineers reviewing the LM2595SX-12/NOPB datasheet, LM2595SX-12/NOPB pinout, LM2595SX-12/NOPB application, or LM2595SX-12/NOPB equivalent, key selection criteria include its fixed 12-V output, TO-263-5 surface-mount package, 150-kHz oscillator frequency, TTL-compatible ON/OFF control, and requirement for only four external components in standard buck configuration.
Technical Context
The LM2595SX-12/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single IC. Its fixed 12-V output version eliminates external feedback resistors, simplifying design while maintaining ±4% regulation across –40°C to +125°C junction temperature and 15 V–40 V input range.
It operates in continuous conduction mode by default, supports discontinuous mode at light loads via inductor selection, and uses a two-stage current-limit mechanism plus thermal shutdown for fault protection. The 150-kHz switching frequency enables compact filter design with standard off-the-shelf inductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Input voltage range | 4.5 V to 40 V - supports wide-input industrial, automotive, and telecom power buses without pre-regulation. |
| Max output current | 1 A DC - sufficient for powering microcontrollers, sensors, or small FPGAs directly from unregulated sources. |
| Switching frequency | 150 kHz (±15%) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to higher-frequency alternatives. |
| Quiescent current | Typ. 5 mA active; 85 μA in standby - minimizes no-load power loss in battery-backed or energy-sensitive applications. |
| ON/OFF threshold | 1.3 V (typ.) - compatible with standard TTL/CMOS logic for simple enable/disable control without level-shifting. |
| Thermal shutdown | Activates at ~150°C junction - prevents permanent damage during overload or poor heatsinking conditions. |
Pinout & Package
LM2595SX-12/NOPB is housed in a TO-263-5 (KTT) thermally enhanced surface-mount package (10.16 mm × 8.42 mm body), with exposed metal tab for PCB thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal switch drain | Swings between (VIN − VSAT) and ~–0.5 V; requires minimal copper area to reduce EMI coupling into sensitive circuits. |
| 2 - +VIN | Power input | Accepts 4.5–40 V; must be bypassed with low-ESR capacitor near pin to supply peak switch current and suppress transients. |
| 3 - Ground | Reference node | Common return for internal circuitry and external components; connects to PCB ground plane for thermal and noise control. |
| 4 - Feedback | Regulation sense | Internally tied to 12-V divider; unused in fixed-output version but must remain unconnected per datasheet. |
| 5 - ON/OFF | Enable control | TTL-compatible input: <1.3 V = ON, >1.3 V = OFF; draws ≤200 μA in shutdown, enabling low-power system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across operating conditions. |
| Integrated protection | Combines thermal shutdown and two-stage current limiting to sustain operation under short-circuit or overtemperature faults without external circuitry. |
| Low-component-count design | Requires only one inductor, one diode, and two capacitors - accelerates prototyping and improves reliability versus multi-chip solutions. |
| 150-kHz fixed oscillator | Enables predictable EMI filtering and compatibility with standard 100–200 kHz inductors, avoiding custom magnetics or high-frequency layout constraints. |
| TTL shutdown interface | Supports direct connection to microcontroller GPIO or system supervisor ICs for coordinated power sequencing without pull-up/pull-down resistors. |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
Use Scenario: Converting 24-V DC factory bus to regulated 12-V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, stable 12-V rail with built-in fault protection. Use Value: Delivers 1-A continuous current with <1% line regulation and no external compensation required, reducing design cycle time. | Use Scenario: Generating local 12-V supply for FPGA configuration circuitry and auxiliary analog subsystems in edge-computing gateways. IC Role / Device Role / Timing Role: On-board switching regulator replacing linear regulators to improve efficiency and reduce thermal load. Use Value: Achieves 90% efficiency at 25-V input/1-A load, cutting board-level heat dissipation by >70% versus linear alternatives. |
| Automotive Aftermarket Module | Test Equipment Power |
Use Scenario: Powering 12-V CAN transceivers and microcontrollers in vehicle diagnostic tools operating from 9–16-V battery input. IC Role / Device Role / Timing Role: Input-tolerant buck converter handling cold-crank (≥4.5 V) and load-dump (≤40 V) transients. Use Value: Maintains regulation across full automotive voltage range without external transient suppressors or pre-regulators. | Use Scenario: Providing clean, adjustable 12-V source in portable benchtop test instruments powered by Li-ion packs. IC Role / Device Role / Timing Role: Main DC-DC stage converting 14.8-V nominal battery voltage to precise 12-V output. Use Value: Enables 85-μA standby current for long battery life in sleep mode while supporting fast wake-up via TTL ON/OFF pin. |
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-12 | TO-220-5 through-hole package; higher RθJA (50°C/W vs. 30°C/W for TO-263 with 2.5 in² copper) | Suitable for prototyping or low-volume assemblies where manual soldering is preferred | Select when thermal management via heatsink is feasible and surface-mount assembly is unavailable. |
| LM2596-12 | Higher 1.5-A output rating; improved efficiency (up to 92%); same pinout and footprint as LM2595 series | Better suited for future-proofing designs requiring margin or higher load headroom | Choose when 1-A limit is insufficient or when upgrading legacy LM2595-based designs with minimal layout change. |
Compared with LM2595SX-12/NOPB, LM2595T-12 offers identical electrical performance but requires mechanical heatsinking in high-power applications, while LM2596-12 provides higher current capability and efficiency with drop-in compatibility-making it ideal for next-generation designs needing scalability without redesign.
Availability
LM2595SX-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rails, and automotive aftermarket modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2595SX-12/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and robust protection are critical.
FAQ
What is the maximum input voltage rating for the LM2595SX-12/NOPB?
The LM2595SX-12/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V continuously risks triggering internal protection or degrading long-term reliability, even though 45 V is listed as a stress limit-not a functional specification. Always maintain input within 40 V for sustained operation of the LM2595SX-12/NOPB.
Does the LM2595SX-12/NOPB require external feedback resistors?
No, the LM2595SX-12/NOPB is a fixed-output version with internal resistor divider set to 12 V; the Feedback pin (Pin 4) is not connected internally to the output and must remain unconnected in circuit. This eliminates tuning complexity and improves stability versus adjustable variants, making the LM2595SX-12/NOPB ideal for dedicated 12-V rail generation.
What thermal considerations apply to the LM2595SX-12/NOPB in TO-263-5 package?
The LM2595SX-12/NOPB in TO-263-5 (KTT) achieves RθJA = 30°C/W with 2.5 in² of 1-oz copper, enabling 1-A operation at ambient ≤50°C without a heatsink. For higher ambient or continuous full-load use, thermal vias under the exposed tab and extended copper pour are essential. Junction temperature must stay below 125°C for reliable operation of the LM2595SX-12/NOPB.
Can the LM2595SX-12/NOPB be used in an inverting (positive-to-negative) configuration?
Yes-the LM2595SX-12/NOPB supports inverting topology by bootstrapping its ground pin to the negative output, enabling generation of –12 V from a positive input. However, this requires additional diodes and modified component values; the ON/OFF threshold shifts to ~13 V, and startup current peaks near 1.5 A. Full implementation details are documented in TI's LM2595 datasheet Figure 18 for the LM2595SX-12/NOPB.
Is the LM2595SX-12/NOPB RoHS compliant and lead-free?
Yes, the LM2595SX-12/NOPB carries the /NOPB suffix, indicating lead-free (Pb-free) packaging and RoHS compliance per EU Directive 2011/65/EU. It uses matte tin lead finish and meets TI's green chemistry standards, with no exemptions claimed. This ensures environmental compliance for global electronics manufacturing using the LM2595SX-12/NOPB.
LM2595SX-12/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):
- 12V
- 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-12/NOPB FAQ
1.How can I place an order for LM2595SX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595SX-12/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-12/NOPB reliable?
The price and inventory of LM2595SX-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595SX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595SX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595SX-12/NOPB?
LM2595SX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595SX-12/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-12/NOPB?
For technical support, including LM2595SX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595SX-12/NOPB requirements.
6.How does Aetrix verify that LM2595SX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595SX-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595SX-12/NOPB?
All LM2595SX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595SX-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2595SX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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