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Texas Instruments LM2596S-3.3/NOPB
- Part No.:
- LM2596S-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596S-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
LM2596S-3.3/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter IC delivering 3.3 V fixed output at up to 3 A load current, operating from 4.5 V to 40 V input, with 150 kHz fixed switching frequency and ±4% output voltage tolerance over line and load. It serves as the primary power conversion stage in industrial power supplies and embedded system rails.
For engineers reviewing the LM2596S-3.3/NOPB datasheet, LM2596S-3.3/NOPB pinout, LM2596S-3.3/NOPB application, or LM2596S-3.3/NOPB equivalent, key selection criteria include input voltage range (4.5–40 V), thermal performance in TO-263 package, ON/OFF logic control threshold (1.3 V), and efficiency (73% at 12 VIN/3 AOUT).
Technical Context
The LM2596S-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a monolithic buck regulator architecture. Its 150 kHz oscillator enables use of standard off-the-shelf inductors and reduces filter component size versus lower-frequency alternatives.
It operates in continuous conduction mode by default, supports discontinuous mode at light loads, and implements two-stage current limiting plus thermal shutdown for fault protection. The feedback loop uses an internal 1.23 V reference with external resistor divider omitted in the fixed 3.3 V version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over –40°C to +125°C, ensuring stable microcontroller core rail under thermal stress. |
| Max Output Current | 3 A DC load capability, sufficient for powering FPGA I/O banks or multi-rail embedded processors. |
| Input Voltage Range | 4.5 V to 40 V, enabling direct operation from 12 V/24 V industrial bus or unregulated AC-DC outputs. |
| Switching Frequency | 150 kHz ±15%, allowing use of low-cost, high-saturation-current shielded inductors without EMI filtering penalties. |
| Quiescent Current | 80 μA in shutdown (ON/OFF pin >1.3 V), minimizing standby power in battery-backed systems. |
| Efficiency | 73% at 12 VIN, 3.3 VOUT, 3 A - confirms practical thermal design margin in TO-263 package without forced air. |
| Thermal Shutdown | Active at 150°C junction temperature, protecting against sustained overload or inadequate heatsinking. |
Pinout & Package
LM2596S-3.3/NOPB is packaged in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad, measuring 10.10 mm × 8.89 mm, optimized for PCB heat dissipation via tab soldering to copper area.
| 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 switch current and suppress transients. |
| 2 - OUTPUT | Internal power switch drain | Swings between ~VIN–1.4 V and –0.5 V; minimal PCB copper area required to reduce EMI coupling into sensitive analog sections. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and thermal pad; must be low-impedance connection to minimize noise. |
| 4 - FEEDBACK | Regulation sense node | Internally connected to 3.3 V output; no external resistors needed - simplifies layout and eliminates trimming errors. |
| 5 - ON/OFF | Logic-controlled enable | Drives regulator ON when ≤1.3 V (25°C); OFF when ≥1.3 V (up to 25 V max); 80 μA standby current enables clean system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistor network, reducing BOM count and layout sensitivity while guaranteeing ±4% regulation across temperature and load. |
| TTL-compatible ON/OFF control | Enables direct interfacing with microcontroller GPIO or system supervisor ICs without level-shifting circuitry. |
| Integrated thermal shutdown | Prevents permanent damage during transient overloads or insufficient heatsinking - critical for sealed industrial enclosures. |
| 150 kHz fixed-frequency operation | Permits use of low-cost, widely available 33–100 μH shielded inductors with saturation current ≥4.5 A, accelerating design cycle. |
| Self-protected current limiting | Two-stage foldback current limit prevents destructive peak currents during short-circuit events while maintaining safe junction temperature. |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
Use Scenario: Providing regulated 3.3 V for PLC I/O modules powered from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering main logic rail with line/load regulation <±0.2%. Use Value: Maintains stable 3.3 V output despite 24 V bus ripple and load steps up to 3 A, eliminating need for post-regulation LDOs. |
Use Scenario: Powering ARM Cortex-M7 MCU and DDR3L memory interface in edge gateway device. IC Role / Device Role / Timing Role: High-current intermediate rail generator feeding downstream point-of-load converters. Use Value: Delivers 3 A at 73% efficiency with minimal thermal rise on 2-layer PCB, avoiding costly thermal vias or heatsinks. |
| Appliance Control Board | Home Theater AV Receiver |
Use Scenario: Generating 3.3 V for smart refrigerator main controller board operating from 12 V SMPS. IC Role / Device Role / Timing Role: Main system voltage regulator with integrated shutdown for energy-saving sleep modes. Use Value: Reduces standby power to 80 μA via ON/OFF pin control, meeting IEC 62301 Level 5 requirements. |
Use Scenario: Supplying 3.3 V to HDMI PHY and audio DSP in compact AV receiver chassis. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage replacing linear regulators to avoid thermal derating. Use Value: TO-263 package allows direct thermal pad soldering to 2.5 in² copper pour, sustaining 3 A continuously without fan cooling. |
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-3.3/NOPB | TO-220 package (NDH), higher RθJA (50°C/W vs. 30°C/W), identical electrical specs. | Suitable for through-hole prototyping or low-volume assemblies where manual soldering is preferred. | Select when mechanical mounting constraints favor vertical leaded package or when thermal mass of TO-220 aids transient thermal response. |
| LMR51430RGER | Synchronous buck, 4.5–36 V input, 3 A, 500 kHz/1.1 MHz, 92% efficiency, integrated MOSFETs. | Higher efficiency and smaller solution size but requires more complex layout and external compensation. | Choose for new designs prioritizing efficiency >90% and footprint reduction; not drop-in due to different pinout, control scheme, and external component count. |
Compared with LM2596S-3.3/NOPB, the TO-220 variant offers identical regulation but less efficient thermal transfer, while the LMR51430 delivers superior efficiency and frequency flexibility at the cost of design complexity and non-interchangeable packaging.
Availability
LM2596S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rails, and appliance control boards requiring stable component supply with long lifecycle visibility.
Supply support for LM2596S-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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management ICs.
The LM2596 series was designed as a rugged, easy-to-use SIMPLE SWITCHER® buck regulator family targeting cost-sensitive industrial, appliance, and consumer applications requiring reliable 3-A DC-DC conversion without complex layout or tuning.
FAQ
What is the maximum input voltage rating for LM2596S-3.3/NOPB?
The absolute maximum input voltage for LM2596S-3.3/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Operation above 40 V risks exceeding internal transistor breakdown limits and invalidates guaranteed performance specifications. For 48 V nominal systems, a pre-regulator stage is required before LM2596S-3.3/NOPB.
Does LM2596S-3.3/NOPB require external feedback resistors?
No, LM2596S-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its internal feedback divider is factory-trimmed to deliver 3.3 V ±4%. Pin 4 (FEEDBACK) is internally connected to the output, eliminating resistor selection, placement, and tolerance errors - a key advantage over adjustable versions like LM2596ADJ.
What thermal performance can be expected from LM2596S-3.3/NOPB in TO-263 package?
In the TO-263 (KTT) package, LM2596S-3.3/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 30°C/W when mounted on a single-sided PCB with 2.5 in² of 1-oz copper. At 3 A output and 12 V input, this yields ~25°C junction-to-ambient rise above ambient, enabling full-load operation without forced airflow in typical industrial enclosures.
Can LM2596S-3.3/NOPB be used in inverting (buck-boost) configuration?
Yes, LM2596S-3.3/NOPB can be configured as an inverting regulator to generate negative output voltages, such as –3.3 V. This requires bootstrapping the GND pin to the output rail and grounding the FEEDBACK pin. However, startup current surges exceed 4 A, and ON/OFF control requires level shifting - making it less straightforward than standard buck use.
Is LM2596S-3.3/NOPB RoHS compliant and lead-free?
Yes, LM2596S-3.3/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free", confirming compliance with EU Directive 2011/65/EU and TI's green packaging standards. It uses matte tin lead finish and halogen-free molding compound.
LM2596S-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:
- 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:
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2596S-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596S-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 LM2596S-3.3/NOPB reliable?
The price and inventory of LM2596S-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 LM2596S-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596S-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596S-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596S-3.3/NOPB?
LM2596S-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596S-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 LM2596S-3.3/NOPB?
For technical support, including LM2596S-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596S-3.3/NOPB requirements.
6.How does Aetrix verify that LM2596S-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596S-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 LM2596S-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596S-3.3/NOPB?
All LM2596S-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596S-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 LM2596S-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2596S-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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