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Texas Instruments LM2596SX-5.0/NOPB
- Part No.:
- LM2596SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596SX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:699
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Product details
Overview
LM2596SX-5.0/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter delivering 5 V at up to 3 A with ±4% output voltage tolerance, 150-kHz fixed-frequency operation, and input voltage support up to 40 V. It integrates internal frequency compensation and thermal/current protection, and is used in industrial power supplies requiring stable 5-V rail generation from unregulated DC sources.
For engineers reviewing the LM2596SX-5.0/NOPB datasheet, LM2596SX-5.0/NOPB pinout, LM2596SX-5.0/NOPB application, or LM2596SX-5.0/NOPB equivalent, key selection criteria include its TO-263-5 package thermal performance, ON/OFF logic control interface, 80-μA standby current, and compatibility with standard off-the-shelf inductors and catch diodes.
Technical Context
The LM2596SX-5.0/NOPB implements a buck topology using an integrated N-channel MOSFET switch with 1.4-V typical saturation voltage at 3-A load and a two-stage current-limit protection scheme. Its 150-kHz oscillator enables use of compact external filter components while maintaining stable regulation across line (4.5–40 V) and load (0.2–3 A) variations.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads via inductor selection. Feedback is implemented through a dedicated pin sensing the regulated 5-V output, with 1.23-V reference voltage and 50-nA bias current enabling high-accuracy resistive divider networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over –40°C to +125°C, ensuring stable rail for microcontrollers and analog circuitry without external feedback resistors. |
| Max Output Current | 3 A DC continuous, supporting high-power peripherals such as displays, sensors, and motor drivers in embedded systems. |
| Input Voltage Range | 4.5 V to 40 V, enabling direct use with 12-V/24-V industrial buses, automotive batteries, and rectified AC supplies. |
| Switching Frequency | 150 kHz ±15%, allowing use of low-cost, widely available 33–100 μH shielded inductors and reducing EMI compared to higher-frequency alternatives. |
| Quiescent Current | 80 μA in shutdown (ON/OFF pin >1.3 V), minimizing standby power loss in battery-backed or energy-sensitive applications. |
| Thermal Protection | Internal overtemperature shutdown with automatic recovery, preventing latch-up during transient overload or poor heatsinking conditions. |
| Efficiency | 80% typical at 12-V input / 3-A load, balancing thermal management needs and power density in space-constrained designs. |
Pinout & Package
LM2596SX-5.0/NOPB is housed in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad, measuring 10.10 mm × 8.89 mm and rated for 20°C/W junction-to-ambient thermal resistance when mounted on a double-sided PCB with 3 in² copper area on the device side and 16 in² on the opposite side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts up to 40 V DC; requires local 100-μF low-ESR input capacitor to suppress switching transients and supply peak currents. |
| 2 - OUTPUT | Switch node | Connects to external catch diode anode and inductor; voltage swings between ~VIN–1.4 V and –0.5 V; minimal PCB copper area required to reduce EMI coupling. |
| 3 - GND | Circuit ground | Common return path for input capacitor, output capacitor, feedback network, and thermal pad; must be low-impedance connection to minimize noise and thermal resistance. |
| 4 - FEEDBACK | Voltage sense input | Internally referenced to 1.23 V; unused in fixed 5-V version but internally connected to output; no external components needed. |
| 5 - ON/OFF | Logic-controlled enable | TTL-compatible shutdown: <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 |
|---|---|
| Integrated thermal shutdown | Automatically disables switching above 150°C junction temperature and resumes operation after cooldown, eliminating need for external thermal monitoring circuitry. |
| Two-stage current limiting | First stage reduces switching frequency under overload; second stage clamps peak switch current to ~4.5 A, protecting both IC and external components during short-circuit events. |
| Fixed-frequency oscillator | 150-kHz internal clock eliminates need for external timing components and simplifies EMI filtering design versus variable-frequency controllers. |
| Low-component-count design | Requires only four external parts - input capacitor, output capacitor, inductor, and catch diode - reducing BOM cost and layout complexity. |
| Standard inductor compatibility | Optimized for common 33–100 μH shielded power inductors from multiple manufacturers, avoiding custom magnetics and accelerating prototyping. |
Applications
| Industrial Power Supply | Home Theater System |
|---|---|
Use Scenario: Converting 24-V DC bus to stable 5-V rail for HDMI interface ICs, audio DACs, and remote control receivers in AV receivers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, low-noise 5-V supply with fast transient response to handle burst-mode video/audio data transfers. Use Value: Delivers 3-A peak current headroom for simultaneous HDMI hot-plug detection, IR decoding, and USB peripheral enumeration without rail collapse. | Use Scenario: Generating 5-V logic supply for microcontroller-based remote control subsystems and display backlight drivers in smart soundbars. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter operating from 12-V wall adapter input, enabling compact board layout and reduced heat dissipation versus linear regulators. Use Value: 80-μA shutdown current extends standby battery life in cordless remote modules powered from coin cells or supercapacitors. |
| Grid Infrastructure Metering | EPOS Terminal |
Use Scenario: Providing isolated 5-V auxiliary supply for metrology ADCs and real-time clocks in smart electricity meters operating from 48-V DC backup rails. IC Role / Device Role / Timing Role: High-reliability buck converter with thermal foldback, supporting extended lifetime requirements in sealed, fanless enclosures. Use Value: ±4% output tolerance ensures accurate reference voltage for 24-bit sigma-delta ADCs across –40°C to +85°C ambient temperature range. | Use Scenario: Powering 5-V logic and communication interfaces (RS-232, USB, Ethernet PHY) in point-of-sale terminals powered from 12-V vehicle or wall adapters. IC Role / Device Role / Timing Role: Main system regulator handling wide-input transients (load dump, cold crank) while maintaining uninterrupted operation during brief input dips. Use Value: 40-V absolute maximum input rating withstands automotive load-dump spikes up to 45 V without external clamping diodes. |
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-5.0 | TO-220-5 through-hole package; higher RθJA (50°C/W vs. 20°C/W); identical electrical specs. | Suitable for prototyping or low-volume assemblies where manual soldering or heatsink mounting is preferred. | Select LM2596T-5.0 when thermal management relies on external heatsinks or when through-hole assembly is required. |
| LMR51430RGER | Synchronous buck converter; 500-kHz/1.1-MHz selectable frequency; 4.5–36-V input; 3-A output; integrated high-side/low-side FETs. | Higher efficiency (≥92%), smaller solution size, and lower EMI due to synchronous rectification and higher switching frequency. | Choose LMR51430RGER for new designs prioritizing efficiency, compactness, and reduced external component count over legacy compatibility. |
Compared with LM2596SX-5.0/NOPB, LM2596T-5.0 offers identical regulation performance in a thermally less efficient through-hole package, while LMR51430RGER delivers superior efficiency and integration at the cost of higher design complexity and sensitivity to PCB layout parasitics.
Availability
LM2596SX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, grid infrastructure metering, home theater systems, and EPOS terminals requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM2596SX-5.0/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 and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.
The LM2596 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC conversion applications where reliability, thermal robustness, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for the LM2596SX-5.0/NOPB?
The LM2596SX-5.0/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating input voltage ranging from 4.5 V to 40 V. Exceeding 40 V during normal operation risks premature degradation, while transient spikes up to 45 V are tolerated for short durations per absolute maximum ratings. The device includes internal protection against overvoltage stress on the VIN pin, but sustained operation above 40 V is not advised. Always verify input source characteristics and include appropriate front-end clamping if surge-prone environments are expected for LM2596SX-5.0/NOPB deployments.
Does the LM2596SX-5.0/NOPB require external feedback resistors to set the output voltage?
No, the LM2596SX-5.0/NOPB does not require external feedback resistors because it is a fixed 5.0-V output variant. Internal resistor dividers connect the FEEDBACK pin to the regulated output, eliminating the need for external components. This simplifies design, improves accuracy (±4% over temperature and load), and enhances reliability by removing potential drift sources. The FEEDBACK pin remains accessible but is internally terminated; connecting external components to it is unnecessary and may impair regulation. All calibration and tolerance specifications for LM2596SX-5.0/NOPB assume this internal configuration.
How does the ON/OFF pin function on the LM2596SX-5.0/NOPB?
The ON/OFF pin on the LM2596SX-5.0/NOPB provides TTL-compatible logic control: pulling the pin below ~1.3 V (referenced to GND) enables regulation, while pulling it above ~1.3 V disables switching and reduces quiescent current to 80 μA. The pin draws ≤15 μA in either state and tolerates up to 25 V. For always-on operation, tie ON/OFF directly to GND. No pull-up or pull-down is required. This feature allows precise sequencing, remote shutdown, or low-power sleep modes in systems using LM2596SX-5.0/NOPB as the main 5-V supply.
What thermal performance can be expected from the LM2596SX-5.0/NOPB in a standard PCB layout?
In a standard double-sided PCB layout with 3 in² of 1-oz copper on the LM2596SX-5.0/NOPB side and ~16 in² on the opposite layer, the device achieves a junction-to-ambient thermal resistance (RθJA) of 20°C/W. At 3-A load and 12-V input, typical power dissipation is ~2.1 W, resulting in ~42°C junction rise above ambient. With proper thermal pad soldering and adequate copper area, the LM2596SX-5.0/NOPB sustains full load at 85°C ambient without thermal shutdown. Performance degrades significantly with insufficient copper or single-layer layouts, where RθJA exceeds 50°C/W.
Can the LM2596SX-5.0/NOPB be used in an inverting (buck-boost) configuration to generate –5 V?
Yes, the LM2596SX-5.0/NOPB can be configured as an inverting regulator to produce –5 V from a positive input, as documented in TI's SNVS124G datasheet Figure 8-5. This requires bootstrapping the GND pin to the negative output and grounding the FEEDBACK pin. Critical considerations include using a Schottky catch diode, selecting a 33-μH inductor rated for ≥3.5 A, and adding startup delay circuitry to manage high inrush current. The ON/OFF threshold shifts to ~13 V in this topology, and maximum input+|output| voltage must remain ≤40 V. While functional, this is a nonstandard application for LM2596SX-5.0/NOPB and requires careful validation.
LM2596SX-5.0/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):
- 5V
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2596SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596SX-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2596SX-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596SX-5.0/NOPB?
LM2596SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596SX-5.0/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-5.0/NOPB?
For technical support, including LM2596SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2596SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596SX-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596SX-5.0/NOPB?
All LM2596SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596SX-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2596SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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