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Texas Instruments LM2596SX-ADJ/NOPB
- Part No.:
- LM2596SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596SX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
LM2596SX-ADJ/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter IC delivering up to 3 A output current, operating at a fixed 150-kHz switching frequency, with adjustable output voltage range of 1.2 V to 37 V (±4% tolerance), input voltage support up to 40 V, and integrated thermal shutdown and current-limit protection. It serves as the core power conversion stage in compact, cost-sensitive industrial and consumer power supplies.
For engineers reviewing the LM2596SX-ADJ/NOPB datasheet, LM2596SX-ADJ/NOPB pinout, LM2596SX-ADJ/NOPB application, or LM2596SX-ADJ/NOPB equivalent, key selection criteria include its 3-A load capability, 150-kHz fixed-frequency operation enabling small external inductors, ±4% output voltage accuracy over line/load/temperature, TTL-compatible ON/OFF control with 80-μA standby current, and TO-263-5 surface-mount package suitability for thermally demanding layouts.
Technical Context
The LM2596SX-ADJ/NOPB implements a monolithic buck regulator architecture with an internal NPN power switch, fixed-frequency PWM controller, and internal frequency compensation-requiring only four external components (inductor, diode, input capacitor, output capacitor) for full operation. Its feedback loop senses output voltage via the 1.23-V reference at the FB pin, enabling precise regulation across the 1.2–37-V range using two external resistors.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads, featuring a two-stage current limit (peak ~4.5 A at 25°C) and thermal shutdown at ~150°C junction temperature. The ON/OFF pin provides logic-level shutdown with 1.3-V threshold and <200-μA standby quiescent current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A DC maximum-supports mid-power applications without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V-enables direct operation from 12-V, 24-V, or unregulated AC/DC rails. |
| Output Voltage Range | 1.2 V to 37 V adjustable-set via external resistor divider; 1.23-V internal reference enables precision tuning. |
| Switching Frequency | 150 kHz (±15%)-fixed internal oscillator allows predictable EMI filtering and use of low-cost, standard inductors. |
| Feedback Reference | 1.23 V ±2.4%-defines output setpoint accuracy; determines regulation error budget in final design. |
| Quiescent Current | 80 μA typical in shutdown-minimizes system standby power loss in battery-backed or energy-conscious systems. |
| Thermal Protection | Junction shutdown at ~150°C-prevents permanent damage during overload or poor heatsinking conditions. |
Pinout & Package
LM2596SX-ADJ/NOPB is supplied 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 soldered tab connection to copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power Input | Accepts 4.5–40 V DC; requires local 100-μF+ low-ESR input capacitor to handle high di/dt switching currents. |
| 2 - OUTPUT | Switch Node | Drives external catch diode and inductor; voltage swings between ~VIN−1.4 V and −0.5 V-requires minimal PCB copper area to reduce EMI coupling. |
| 3 - GND | Power Ground | Common return for internal circuitry and power path; must be connected to low-impedance ground plane near thermal pad. |
| 4 - FEEDBACK | Regulation Sense | Monitors output via resistor divider; 1.23-V reference sets VOUT = 1.23 × (1 + R1/R2); bias current ≤50 nA minimizes divider error. |
| 5 - ON/OFF | Logic Control | TTL-compatible enable/disable: <1.3 V = ON, >1.3 V = OFF; 80-μA standby draw enables simple microcontroller or logic-level control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 150-kHz oscillator | Enables consistent filter design, predictable EMI signature, and compatibility with off-the-shelf 10–47-μH power inductors. |
| Internal frequency compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity. |
| Two-stage current limiting | Provides soft current foldback under overload, preventing abrupt shutdown and enabling graceful fault recovery. |
| Thermal shutdown with hysteresis | Halts switching at ~150°C junction temp and resumes only after cooldown-protects silicon and PCB integrity. |
| Low 80-μA shutdown IQ | Supports ultra-low-power system sleep modes without compromising fast wake-up response (<100 μs). |
Applications
| Industrial Power Supplies | Consumer Audio Amplifiers |
|---|---|
Use Scenario: Providing stable 5-V or 12-V rails for PLC I/O modules, sensor interfaces, and motor drivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated DC from 24-V bus; handles transient surges up to 3 A without derating. Use Value: High efficiency (>80% at 12-VIN/5-VOUT) reduces thermal load in enclosed enclosures; TO-263 thermal pad enables direct heatsink mounting. | Use Scenario: Generating clean ±15-V analog supply rails for op-amp stages and DACs in home theater receivers and studio monitors. IC Role / Device Role / Timing Role: Adjustable-output buck used in dual-rail configuration (with inverting topology per datasheet Figure 8-5) to derive negative rail from positive input. Use Value: 1.23-V reference and ±4% output tolerance ensure precise rail matching; 150-kHz switching avoids audible noise in sensitive analog sections. |
| Point-of-Load Converters | Appliance Control Boards |
Use Scenario: Local 3.3-V or adjustable voltage generation for microcontrollers, displays, and communication ICs on embedded control boards. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing linear regulators to improve efficiency and reduce board-level heat. Use Value: Only four external components required-lowers BOM cost and simplifies layout; TO-263 footprint fits tight space constraints. | Use Scenario: Powering main MCU, touch panel, and relay drivers in washing machines, refrigerators, and HVAC controllers. IC Role / Device Role / Timing Role: Main 5-V or 3.3-V system supply derived from rectified AC or 12-V battery; withstands wide input transients common in appliance environments. Use Value: 40-V absolute max input rating tolerates 30-V surge events; built-in thermal/current protection prevents field failures due to motor startup surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ | TO-220-5 through-hole package; identical electrical specs; higher RθJA (50°C/W vs. 20–30°C/W for TO-263) | Better suited for prototyping or low-volume assemblies where manual soldering is preferred | Select LM2596T-ADJ if board assembly uses through-hole process or requires vertical heatsink mounting. |
| LMR51430RNXR | Synchronous buck; 4.5–36-V input; 3-A output; 500-kHz/1.1-MHz selectable frequency; integrated MOSFETs; higher efficiency (≥92%) | Replaces LM2596SX-ADJ/NOPB in space-constrained, high-efficiency designs requiring lower thermal footprint | Choose LMR51430RNXR when efficiency >90%, smaller solution size, or synchronous rectification is mandatory. |
Compared with LM2596SX-ADJ/NOPB, LM2596T-ADJ offers identical regulation performance but less thermal performance in surface-mount production, while LMR51430RNXR delivers superior efficiency and integration at the cost of higher complexity and reduced input voltage headroom (max 36 V vs. 40 V).
Availability
LM2596SX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, consumer audio amplifiers, point-of-load converters, and appliance control boards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2596SX-ADJ/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 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 the LM2596SX-ADJ/NOPB?
The LM2596SX-ADJ/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 circuitry. The device's 40-V operational ceiling supports common 24-V and 36-V industrial rails with margin for transients.
How does the feedback pin (FB) function in the LM2596SX-ADJ/NOPB?
The FB pin of the LM2596SX-ADJ/NOPB senses the output voltage via an external resistor divider and compares it to an internal 1.23-V reference. Regulation occurs when the divider ratio satisfies VOUT = 1.23 × (1 + R1/R2). The pin draws ≤50 nA bias current, minimizing error from resistor values above 100 kΩ, and supports remote sensing configurations with proper layout.
Can the LM2596SX-ADJ/NOPB be used in an inverting (buck-boost) configuration?
Yes-the LM2596SX-ADJ/NOPB can be configured as an inverting regulator per TI's datasheet Figure 8-5, generating negative output voltages (e.g., –5 V) from a positive input. This requires bootstrapping the GND pin to the negative rail and referencing FB to ground. Startup current demands are higher, so delayed start-up using the ON/OFF pin is recommended.
What thermal considerations apply to the LM2596SX-ADJ/NOPB in TO-263 package?
The LM2596SX-ADJ/NOPB in TO-263 (KTT) package achieves RθJA as low as 20°C/W when mounted on a double-sided PCB with ≥3 in² of 1-oz copper on the component side and ≥16 in² on the opposite side. Thermal performance degrades significantly without adequate copper area under the exposed tab-TI recommends soldering the tab directly to a thermal plane for reliable 3-A operation.
Is the LM2596SX-ADJ/NOPB RoHS-compliant and lead-free?
Yes-LM2596SX-ADJ/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 requirements and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LM2596SX-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM2596SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596SX-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2596SX-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596SX-ADJ/NOPB?
LM2596SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596SX-ADJ/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-ADJ/NOPB?
For technical support, including LM2596SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2596SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596SX-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596SX-ADJ/NOPB?
All LM2596SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596SX-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2596SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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