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Texas Instruments LM2596SX-ADJ/J7002158
- Part No.:
- LM2596SX-ADJ/J7002158
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596SX-ADJ/J7002158.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
LM2596SX-ADJ/J7002158 from Texas Instruments is a nonsynchronous step-down DC-DC converter IC delivering up to 3 A output current with 150-kHz fixed-frequency switching, 1.2 V to 37 V adjustable output voltage (±4% tolerance), 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 compact, low-component-count buck regulation.
For engineers reviewing the LM2596SX-ADJ/J7002158 datasheet, LM2596SX-ADJ/J7002158 pinout, LM2596SX-ADJ/J7002158 application, or LM2596SX-ADJ/J7002158 equivalent, key selection criteria include its TO-263-5 (KTT) package, feedback reference voltage of 1.23 V, 80 μA standby current, and compatibility with standard off-the-shelf inductors for rapid prototyping.
Technical Context
The LM2596SX-ADJ/J7002158 implements a monolithic buck topology with an integrated N-channel MOSFET switch, fixed 150-kHz oscillator, and internal error amplifier. Its feedback loop senses output voltage via a resistive divider connected to the FB pin, referencing 1.23 V nominal.
It supports TTL-compatible ON/OFF control with 1.3 V logic threshold, delivers 73% efficiency at 12 VIN/3 VOUT/3 A, and features two-stage current limiting plus thermal shutdown-enabling robust operation under overload and high ambient temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports mid-power industrial loads without external current boosting |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input 12/24/36 V systems with margin for transients |
| Feedback Reference | 1.23 V ±20 mV - sets output via external resistor divider; enables precise 1.2–37 V adjustment |
| Switching Frequency | 150 kHz (±15%) - balances EMI, inductor size, and efficiency; avoids AM radio band |
| Quiescent Current | 80 μA typical in shutdown - minimizes system standby power in battery-backed applications |
| Thermal Protection | Junction shutdown at 150 °C - prevents damage during sustained overload or poor heatsinking |
| Current Limit | 3.6–6.9 A peak - provides overcurrent foldback and safe short-circuit response |
Pinout & Package
LM2596SX-ADJ/J7002158 is packaged in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad, measuring 10.10 mm × 8.89 mm. The tab is electrically connected to Pin 3 (Ground) and must be soldered to PCB copper for thermal performance.
| 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 suppress switching transients |
| 2 - OUTPUT | Switch Node | Drives external catch diode and inductor; high dv/dt node - minimize PCB trace area to reduce EMI |
| 3 - GND | Power & Signal Ground | Common return for input/output paths and feedback network; connect thermal pad directly here |
| 4 - FEEDBACK | Regulation Sense | High-impedance input (50 nA bias); connects to resistor divider from VOUT to set 1.23 V reference |
| 5 - ON/OFF | Digital Control | TTL-compatible enable: <1.3 V = ON, >1.3 V = OFF; 80 μA standby draw when pulled high |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switch | Monolithic N-MOSFET with 1.4 V saturation at 3 A - eliminates external switch and simplifies layout |
| Fixed-Frequency Oscillator | 150-kHz internal clock - enables predictable filter design and consistent EMI profile across units |
| Self-Contained Compensation | No external compensation components required - reduces BOM count and design iteration time |
| Robust Protection Suite | Thermal shutdown + peak current limiting + undervoltage lockout - ensures fault resilience without external circuitry |
| Standard Inductor Compatibility | Works with off-the-shelf 33–100 μH shielded power inductors - accelerates prototype validation |
Applications
| Industrial Power Supply | Point-of-Load Converter |
|---|---|
|
Use Scenario: Providing regulated 5 V or 12 V from unregulated 24 V rail in PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3 A to microcontroller, sensors, and interface ICs. Use Value: High efficiency (≥80% at 12 VIN/5 VOUT) reduces thermal load in sealed enclosures. |
Use Scenario: Generating 3.3 V for FPGA core logic from a 12 V intermediate bus in test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 3.3 V with tight line/load regulation. Use Value: ±4% output tolerance and 150-kHz switching enable stable digital supply with minimal output capacitance. |
| Home Theater Power Module | Grid Infrastructure Monitoring Unit |
|
Use Scenario: Converting 36 V DC from PoE++ or wall adapter to 12 V for audio amplifiers and DACs. IC Role / Device Role / Timing Role: High-input-voltage buck regulator handling transient surges up to 40 V. Use Value: 40 V absolute max input rating and thermal shutdown protect against field-induced overvoltage events. |
Use Scenario: Powering RTU telemetry circuits in outdoor substations with wide ambient temperature range. IC Role / Device Role / Timing Role: Industrial-grade DC-DC converter operating from –40°C to +125°C junction. Use Value: Guaranteed operation across full temperature range with no derating below 3 A up to 105°C ambient. |
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-ADJ | TO-220-5 (NDH) through-hole package; identical electrical specs and pinout | Requires wave soldering or manual assembly; less suitable for automated SMT lines | Select when mechanical mounting or heatsink accessibility prioritizes through-hole over surface-mount |
| LMR51430RNXR | Synchronous buck, 500 kHz/1.1 MHz, 3 A, 4.5–36 V input, integrated FETs, smaller 2-mm × 2-mm WSON | Higher efficiency (>90%), lower EMI, but requires external compensation and more complex layout | Choose for new designs needing higher density, better light-load efficiency, or tighter thermal constraints |
Compared with LM2596SX-ADJ/J7002158, LM2596T-ADJ offers identical regulation performance in a through-hole form factor, while LMR51430RNXR delivers synchronous efficiency and frequency flexibility at the cost of increased design complexity and reduced input voltage headroom.
Availability
LM2596SX-ADJ/J7002158 is available at Aetrix Electronics and suitable for industrial power supplies, point-of-load converters, and grid infrastructure monitoring units requiring stable component supply and long-term manufacturability.
Supply support for LM2596SX-ADJ/J7002158 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 experience in high-reliability power conversion solutions.
The LM2596SX-ADJ/J7002158 belongs to TI's SIMPLE SWITCHER® family-designed specifically for cost-sensitive, medium-power DC-DC applications where ease of use, minimal external components, and ruggedness outweigh advanced feature requirements.
FAQ
What is the maximum input voltage rating for LM2596SX-ADJ/J7002158?
The LM2596SX-ADJ/J7002158 has an absolute maximum input voltage rating of 45 V, with recommended operating range up to 40 V. Exceeding 40 V may trigger internal protection or reduce reliability; operation above 45 V risks permanent damage. The device maintains regulation and protection functionality across its full 4.5–40 V operating range, making it suitable for 24 V and 36 V industrial rails with transient margin.
How does the feedback pin (Pin 4) function in LM2596SX-ADJ/J7002158?
The feedback pin (Pin 4) of LM2596SX-ADJ/J7002158 senses the output voltage via a resistive divider and compares it to an internal 1.23 V reference. With only 50 nA typical bias current, it enables high-impedance divider networks. For example, using 1.2 kΩ and 10 kΩ resistors sets VOUT ≈ 11.5 V. This architecture allows precise 1.2–37 V output adjustment while maintaining ±4% accuracy over line, load, and temperature.
Can LM2596SX-ADJ/J7002158 be used in an inverting configuration?
Yes, LM2596SX-ADJ/J7002158 supports inverting regulator topologies by reconfiguring ground and feedback connections, as documented in TI's SNVS124G datasheet Figure 8-5. In this mode, it generates negative outputs (e.g., –5 V from +12 V) with proper diode isolation and inductor selection. However, startup current peaks exceed 4 A, requiring delayed start-up circuitry and careful input capacitor sizing-distinct from standard buck operation.
What thermal management is required for LM2596SX-ADJ/J7002158 at full 3-A load?
At 3 A continuous load and 12 VIN/5 VOUT, LM2596SX-ADJ/J7002158 dissipates ~2.1 W. With its TO-263-5 (KTT) package, thermal resistance is 30°C/W with 2.5 in² copper on one side or 20°C/W with double-sided copper. To maintain ≤125°C junction temperature, ≥1.5 in² of 1-oz copper connected to the thermal pad is mandatory; adding a small heatsink or forced airflow further improves margin in enclosed environments.
Is LM2596SX-ADJ/J7002158 RoHS-compliant and lead-free?
Yes, LM2596SX-ADJ/J7002158 is RoHS-compliant and lead-free per TI's official packaging documentation. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and is qualified for Pb-free reflow soldering profiles with peak temperatures up to 260°C. The TO-263-5 (KTT) package uses matte tin plating and complies with EU Directive 2011/65/EU and China RoHS II.
LM2596SX-ADJ/J7002158 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2596SX-ADJ/J7002158 FAQ
1.How can I place an order for LM2596SX-ADJ/J7002158 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596SX-ADJ/J7002158 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/J7002158 reliable?
The price and inventory of LM2596SX-ADJ/J7002158 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/J7002158 is usually 5 days.
3.What payment methods are accepted for LM2596SX-ADJ/J7002158?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596SX-ADJ/J7002158 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596SX-ADJ/J7002158?
LM2596SX-ADJ/J7002158 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596SX-ADJ/J7002158 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/J7002158?
For technical support, including LM2596SX-ADJ/J7002158 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596SX-ADJ/J7002158 requirements.
6.How does Aetrix verify that LM2596SX-ADJ/J7002158 is sourced from the original manufacturer or authorized distributors?
All LM2596SX-ADJ/J7002158 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/J7002158 meets industry standards.
7.What is the process for return or replacement of LM2596SX-ADJ/J7002158?
All LM2596SX-ADJ/J7002158 units undergo pre-shipment inspection (PSI). If there is an issue with LM2596SX-ADJ/J7002158, 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/J7002158 part is unused and in its original packaging.
Return procedure for LM2596SX-ADJ/J7002158:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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