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Texas Instruments LM2596S-12/NOPB
- Part No.:
- LM2596S-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596S-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:625
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Product details
Overview
LM2596S-12/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous buck DC-DC converter delivering up to 3 A at a fixed 12-V output, with ±4% output voltage tolerance over line and load, input voltage range up to 40 V, and thermal shutdown/current-limit protection - used in industrial power supplies and embedded system rails.
For engineers reviewing the LM2596S-12/NOPB datasheet, LM2596S-12/NOPB pinout, LM2596S-12/NOPB application, or LM2596S-12/NOPB equivalent, key selection criteria include fixed 12-V output accuracy, TO-263-5 package thermal performance, ON/OFF logic control threshold (1.3 V), 80 μA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2596S-12/NOPB integrates a PWM controller, power switch, and internal frequency compensation into a single IC. It operates in continuous conduction mode by default, supports discontinuous mode at light loads, and uses external diode/inductor/capacitor for energy transfer - no synchronous rectification or external compensation required.
Its fixed 150-kHz oscillator enables predictable filter design with standard inductors; the ON/OFF pin provides TTL-compatible shutdown with 1.3-V threshold and 80-μA standby current; thermal shutdown activates at 150°C junction temperature, and current limiting engages at 3.6–6.9 A peak switch current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over –40°C to 125°C, 0.2–3 A load, 15–40 V input - ensures stable rail for microcontrollers and analog circuitry without feedback resistor network. |
| Input Voltage Range | 4.5 V to 40 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Max Output Current | 3 A DC - sufficient for powering FPGA I/O banks, motor drivers, or multi-rail subsystems with margin. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, high-saturation-current power inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Standby Quiescent Current | 80 μA typical at VIN = 40 V - allows low-power shutdown mode in battery-backed or energy-sensitive applications. |
| Efficiency | 90% typical at VIN = 25 V, IOUT = 3 A - minimizes thermal dissipation in enclosed enclosures without forced airflow. |
| Thermal Shutdown | Activates at 150°C junction temperature - protects device during overload or poor heatsinking conditions. |
Pinout & Package
LM2596S-12/NOPB is supplied in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad; body size 10.10 mm × 8.89 mm; recommended PCB copper area ≥2.5 in² (1-oz) under tab for RθJA = 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 4.5–40 V; requires local 100-μF low-ESR input capacitor to handle pulsed switching current and suppress transients. |
| 2 - OUTPUT | Internal power switch drain | Swings between ~VIN − 1.4 V (ON) and ~−0.5 V (OFF); connects directly to catch diode anode and inductor - minimal copper area critical for EMI control. |
| 3 - GND | Circuit ground reference | Common return for feedback, ON/OFF, and thermal pad; must be low-impedance connection to minimize noise coupling into control loop. |
| 4 - FEEDBACK | Voltage sense input | Internally referenced to 1.23 V; unused in fixed-output versions - left unconnected per datasheet guidance. |
| 5 - ON/OFF | Logic-controlled enable | TTL-compatible: <1.3 V = ON, >1.3 V = OFF; draws ≤15 μA when active; can be tied to GND for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output with ±4% tolerance | Eliminates external resistor divider, reducing BOM count and layout sensitivity while maintaining precision across temperature and load. |
| 150-kHz fixed-frequency operation | Enables predictable LC filter sizing using widely available, cost-optimized 33–100 μH power inductors with 3.5-A saturation rating. |
| TTL shutdown with 80-μA standby | Supports low-power system sleep modes without auxiliary LDOs or discrete MOSFETs - ideal for remote sensors and portable instrumentation. |
| Integrated thermal and current limiting | Provides self-protection during short-circuit, overtemperature, or startup surge without external sensing components or fault-handling logic. |
| TO-263-5 thermal pad design | Allows direct thermal coupling to PCB copper plane for passive cooling - achieves 30°C/W RθJA with 2.5 in² 1-oz copper, avoiding heatsink requirement below 2 W dissipation. |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
|
Use Scenario: Converting 24-V DC bus to regulated 12-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, low-noise 12-V supply with fast transient response to load steps. Use Value: Delivers 3-A continuous current with 90% efficiency at 25-V input, minimizing heat buildup in DIN-rail mounted enclosures. |
Use Scenario: Generating 12-V bias for op-amps, ADC references, and relay drivers in medical diagnostic equipment. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying clean, stable voltage independent of upstream supply ripple. Use Value: ±4% output tolerance and excellent line regulation ensure consistent analog signal chain performance across varying input conditions. |
| Automotive Aftermarket | Test & Measurement Equipment |
|
Use Scenario: Regulating vehicle battery voltage (9–16 V) to stable 12-V for dash-mounted infotainment accessories. IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling cold-crank and load-dump transients via robust 40-V absolute max rating. Use Value: Thermal shutdown and current limit protect against sustained overloads during accessory hot-plug events. |
Use Scenario: Providing 12-V auxiliary rail for digital logic and analog front-end circuits in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent converter enabling fanless operation and low standby power consumption. Use Value: 80-μA shutdown current extends battery runtime in portable test instruments without compromising turn-on speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-12/LF03 | Same electrical specs and pinout; TO-220-5 package with vertical lead form - higher RθJA (50°C/W) requires heatsink above 1.5 W dissipation. | Suitable for through-hole prototyping or legacy board designs where surface-mount is not feasible. | Select LM2596T-12/LF03 only when mechanical constraints mandate TO-220 mounting or manual assembly is preferred. |
| LMR51430RGER | Synchronous 3-A buck with 500-kHz/1.1-MHz switching, 4.5–36-V input, adjustable output, and integrated FETs - no external diode required. | Higher efficiency (>92%), smaller solution size, but requires feedback resistor network and more complex layout. | Choose LMR51430RGER for new designs prioritizing efficiency, footprint, and thermal performance - not a drop-in replacement. |
Compared with LM2596S-12/NOPB, LM2596T-12/LF03 offers identical regulation but demands heatsinking at lower power levels due to TO-220 thermal resistance, while LMR51430RGER delivers superior efficiency and integration at the cost of design complexity and loss of fixed-output simplicity.
Availability
LM2596S-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rails, and automotive aftermarket electronics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2596S-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 ICs, with decades of expertise in reliable, high-volume power conversion solutions.
The LM2596 series was designed for cost-sensitive, medium-power DC-DC conversion in industrial, consumer, and automotive applications - emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LM2596S-12/NOPB?
The LM2596S-12/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range up to 40 V. Exceeding 40 V continuously risks exceeding thermal limits or triggering overvoltage stress on internal components - sustained operation above 40 V is not advised even if within absolute max ratings.
Does the LM2596S-12/NOPB require external feedback resistors?
No, the LM2596S-12/NOPB is a fixed-output variant with internal resistor divider set to 12 V; the FEEDBACK pin (Pin 4) is not connected in normal operation and must remain unconnected per TI's datasheet guidance - adding external resistors would disrupt regulation.
Can the LM2596S-12/NOPB be used in an inverting configuration?
Yes, the LM2596S-12/NOPB supports inverting topologies (e.g., +24 V to –12 V) by bootstrapping the GND pin to the negative output, but requires additional diodes and modified startup sequencing; efficiency and current capability decrease versus buck mode, and ON/OFF control needs level shifting.
What is the thermal resistance (RθJA) of the LM2596S-12/NOPB in its TO-263 package?
For the LM2596S-12/NOPB in TO-263 (KTT) package, RθJA is 30°C/W when mounted on a double-sided PCB with 3 in² of 1-oz copper on the device side and ~16 in² on the opposite side - achieving this requires full thermal pad soldering and proper via stitching per TI layout guidelines.
Is the LM2596S-12/NOPB RoHS-compliant and lead-free?
Yes, the LM2596S-12/NOPB carries the /NOPB suffix indicating lead-free (Pb-free) and RoHS-compliant construction per Texas Instruments' packaging standards - verified in TI's official product change notices and material declarations.
LM2596S-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:
- 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):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- 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)
LM2596S-12/NOPB FAQ
1.How can I place an order for LM2596S-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596S-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 LM2596S-12/NOPB reliable?
The price and inventory of LM2596S-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 LM2596S-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596S-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596S-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596S-12/NOPB?
LM2596S-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596S-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 LM2596S-12/NOPB?
For technical support, including LM2596S-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596S-12/NOPB requirements.
6.How does Aetrix verify that LM2596S-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596S-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 LM2596S-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596S-12/NOPB?
All LM2596S-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596S-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 LM2596S-12/NOPB part is unused and in its original packaging.
Return procedure for LM2596S-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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