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Texas Instruments LM2596SX-3.3/NOPB
- Part No.:
- LM2596SX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596SX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
LM2596SX-3.3/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter delivering 3.3 V at up to 3 A output current, operating at a fixed 150-kHz switching frequency with ±4% output voltage tolerance over line and load, and featuring TTL-compatible ON/OFF control for low-power shutdown. It supports input voltages up to 40 V and is used in industrial power supplies requiring stable, cost-effective buck regulation.
For engineers reviewing the LM2596SX-3.3/NOPB datasheet, LM2596SX-3.3/NOPB pinout, LM2596SX-3.3/NOPB application, or LM2596SX-3.3/NOPB equivalent, key selection criteria include its fixed 3.3-V output, TO-263-5 (KTT) surface-mount package, thermal shutdown protection, 80-μA standby current, and compatibility with standard off-the-shelf inductors and catch diodes.
Technical Context
The LM2596SX-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a monolithic buck regulator architecture. Its fixed 150-kHz oscillator enables predictable filter design using standard inductors, while the internal two-stage current limit and thermal shutdown provide fault protection without external sensing circuitry.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads, with feedback via an internal 1.23-V reference and external resistor divider omitted due to fixed-output configuration. The ON/OFF pin accepts logic-level signals (≤1.3 V ON, ≥1.3 V OFF) referenced to ground, enabling system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable logic supply for microcontrollers and FPGAs without external feedback resistors. |
| Max Output Current | 3 A DC - supports mid-power embedded systems such as industrial controllers and display backlights. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input applications including 12-V/24-V industrial rails and unregulated AC-DC outputs. |
| Switching Frequency | 150 kHz (±15%) - balances efficiency and EMI, allowing use of compact, low-cost 10–47-μH inductors with minimal core loss. |
| Quiescent Current | 80 μA in shutdown - enables battery-backed or always-on subsystems to minimize standby power draw. |
| Efficiency | 73% at 12-VIN/3.3-VOUT/3-A - delivers >2 W of regulated power with <1 W dissipation in typical mid-load conditions. |
| Thermal Protection | Internal overtemperature shutdown - prevents latch-up or damage during sustained overload or poor heatsinking. |
Pinout & Package
LM2596SX-3.3/NOPB is housed 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 spreading and automated assembly.
| 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 suppress switching transients and supply peak currents. |
| 2 - OUTPUT | Switch node | Drives external catch diode and inductor; high dv/dt node requiring minimal PCB copper area to reduce EMI coupling. |
| 3 - GND | Power ground | Common return for input/output capacitors, inductor, and diode; must be connected to thermal pad for optimal thermal performance. |
| 4 - FEEDBACK | Regulation sense | Internally tied to 3.3-V reference; not accessible externally - eliminates need for external resistor divider in fixed-output configuration. |
| 5 - ON/OFF | Logic enable/disable | TTL-compatible control: ≤1.3 V enables regulation; ≥1.3 V disables output and reduces total current to ~80 μA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across –40°C to +125°C. |
| 150-kHz fixed-frequency operation | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter and simplifies compliance testing. |
| Integrated thermal shutdown | Automatically disables switching when junction temperature exceeds safe limits, preventing permanent damage during transient overloads or airflow loss. |
| TTL-compatible ON/OFF control | Allows direct interfacing with microcontroller GPIOs or system supervisors without level-shifting circuitry, supporting precise power sequencing. |
| Requires only four external components | Needs only input capacitor, output capacitor, inductor, and catch diode - minimizes design time and improves reliability versus multi-chip solutions. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Providing clean 3.3-V rail for PLC I/O modules operating from 24-V DC field bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24-V input to isolated 3.3-V logic supply with ripple <50 mVPP. Use Value: Delivers 3 A continuously with 73% efficiency and built-in thermal protection, eliminating need for heatsinks in sealed enclosures. | Use Scenario: Powering ARM Cortex-M7 MCU, Ethernet PHY, and SPI flash on a compact industrial gateway PCB. IC Role / Device Role / Timing Role: Single-chip buck converter supplying main logic voltage with integrated soft-start behavior and low-noise output. Use Value: Fixed 3.3-V output ensures deterministic boot timing; ON/OFF pin enables firmware-controlled sleep/wake cycles. |
| Home Theater Audio Amplifier | Appliance Control Panel |
Use Scenario: Generating 3.3-V bias for digital audio processors and DACs in AV receivers with 12-V internal rail. IC Role / Device Role / Timing Role: Secondary regulator downstream of primary 12-V supply, providing low-noise, well-regulated logic voltage. Use Value: 150-kHz switching allows small LC filter footprint; ±4% tolerance maintains I²S interface timing margins under varying load. | Use Scenario: Powering touch controller, display driver, and wireless SoC in smart refrigerator UI panel powered from 12-V appliance bus. IC Role / Device Role / Timing Role: Main system regulator delivering stable 3.3-V supply with shutdown capability during standby mode. Use Value: 80-μA standby current extends battery backup runtime; TO-263 package supports reflow-soldered thermal management. |
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 | TO-220-5 through-hole package; identical electrical specs and pinout; higher RθJA (50°C/W vs. 30°C/W for KTT). | Suitable for prototyping or low-volume manual assembly where thermal mass of TO-220 suffices. | Select LM2596T-3.3 if board space permits through-hole mounting and heatsink integration is preferred. |
| LMR51430RGER | Synchronous buck converter; 4.5–36-V input; 3-A output; 500-kHz/1.1-MHz selectable frequency; integrated high-side/low-side MOSFETs. | Higher efficiency (>90%), smaller solution size, and no external diode required - suited for space-constrained, thermally sensitive designs. | Choose LMR51430RGER when efficiency >90%, reduced component count, or higher switching frequency is required. |
Compared with LM2596SX-3.3/NOPB, LM2596T-3.3 offers identical regulation but less efficient thermal dissipation in surface-mount layouts, while LMR51430RGER provides synchronous rectification and higher efficiency at the cost of increased complexity and price - making LM2596SX-3.3/NOPB optimal for cost-sensitive, thermally tolerant fixed-output applications.
Availability
LM2596SX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, home theater audio amplifiers, and appliance control panels requiring stable component supply with long-term manufacturability.
Supply support for LM2596SX-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, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2596 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for cost-sensitive, medium-power DC-DC applications where ease of use, minimal external components, and robust protection features are prioritized over ultra-high efficiency or ultra-small footprint.
FAQ
What is the maximum input voltage rating for LM2596SX-3.3/NOPB?
The absolute maximum input voltage for LM2596SX-3.3/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Exceeding 40 V risks violating safe operating area limits and may trigger internal protection circuits. For reliable long-term operation, maintain VIN ≤ 40 V with appropriate derating for temperature and transient spikes.
Does LM2596SX-3.3/NOPB require an external feedback resistor network?
No, LM2596SX-3.3/NOPB does not require external feedback resistors because it is a fixed-output variant with the 3.3-V reference internally connected to the FEEDBACK pin. This eliminates tuning components and associated layout sensitivity, distinguishing it from the adjustable LM2596ADJ version which requires two external resistors.
Can LM2596SX-3.3/NOPB be used in an inverting (buck-boost) configuration?
Yes, LM2596SX-3.3/NOPB can be configured as an inverting regulator to generate negative output voltages, as documented in TI's SNVS124G datasheet Figure 8-5. However, this requires re-referencing the GND pin to the output, adding external diodes (D1, D3), and adjusting startup sequencing - the device itself remains a buck topology and does not natively support inverting operation.
What thermal considerations apply to LM2596SX-3.3/NOPB in TO-263 package?
LM2596SX-3.3/NOPB in the TO-263-5 (KTT) package achieves RθJA ≈ 30°C/W with 2.5 in² of 1-oz copper on a single-sided PCB, per datasheet Section 7.4. To maintain TJ ≤ 125°C at 3-A load, ensure the thermal pad is soldered to a minimum 2.5 in² copper pour and avoid enclosing the device in non-ventilated enclosures without thermal analysis.
Is LM2596SX-3.3/NOPB RoHS-compliant and lead-free?
Yes, LM2596SX-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 (MSL) 3 and is qualified for Pb-free reflow soldering profiles up to 260°C peak temperature.
LM2596SX-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:
- 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)
LM2596SX-3.3/NOPB FAQ
1.How can I place an order for LM2596SX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596SX-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 LM2596SX-3.3/NOPB reliable?
The price and inventory of LM2596SX-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 LM2596SX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596SX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596SX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596SX-3.3/NOPB?
LM2596SX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596SX-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 LM2596SX-3.3/NOPB?
For technical support, including LM2596SX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596SX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2596SX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596SX-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 LM2596SX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596SX-3.3/NOPB?
All LM2596SX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596SX-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 LM2596SX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2596SX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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