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Texas Instruments LM2596S-ADJ
- Part No.:
- LM2596S-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596S-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,517
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Product details
Overview
LM2596S-ADJ 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, used in industrial power supplies requiring stable mid-power regulation.
For engineers reviewing the LM2596S-ADJ datasheet, LM2596S-ADJ pinout, LM2596S-ADJ application, or LM2596S-ADJ equivalent, key selection criteria include output adjustability range, TO-263 package thermal performance, ON/OFF logic control threshold, feedback bias current (≤50 nA), and efficiency at 3 A load under 12-V input.
Technical Context
The LM2596S-ADJ implements a buck topology with an integrated N-channel MOSFET switch and internal 150-kHz oscillator. Its feedback loop uses a precision 1.23-V reference sensed at the FB pin, enabling output programming via external resistor divider. The device operates in continuous conduction mode by default but supports discontinuous mode at light loads.
Protection features include two-stage current limiting (peak limit 3.6–6.9 A) and thermal shutdown at 150°C junction temperature. Standby quiescent current is 80 μA typical when the ON/OFF pin is pulled high, with logic-compatible shutdown threshold of 1.3 V (±0.7 V over temperature).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A maximum continuous DC load current - supports mid-power systems without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial rails including 12-V, 24-V, and 36-V bus systems. |
| Output Voltage Range | 1.2 V to 37 V adjustable (±4% max error) - enables single-part flexibility across multiple system voltages. |
| Switching Frequency | 150 kHz (±15%) - balances inductor size, EMI, and efficiency; allows use of low-cost, standard off-the-shelf inductors. |
| Feedback Reference | 1.23 V ±2.7% - sets output via R1/R2 divider; low 50-nA bias current minimizes divider error and power loss. |
| Quiescent Current | 80 μA standby (ON/OFF = HIGH), 5–10 mA operating - enables low-power hold-up and battery-backed operation. |
| Thermal Protection | Junction shutdown at 150°C - prevents damage during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2596S-ADJ is packaged in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad for enhanced heat dissipation. The package measures 10.10 mm × 8.89 mm and requires soldering the tab to ≥2.5 in² of 1-oz copper for optimal RθJA (20°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VIN | Positive input supply | Accepts up to 40 V; requires local 100-μF low-ESR input capacitor to handle pulsed switch current and suppress transients. |
| 2. OUTPUT | Internal switch node | Connects to catch diode anode and inductor; high dv/dt node - minimize PCB trace area to reduce EMI coupling. |
| 3. GND | Circuit ground reference | Common return for feedback, shutdown, and power paths; tie directly to thermal pad and input/output capacitor grounds. |
| 4. FEEDBACK | Voltage sense input | Monitors divided output voltage; 1.23-V reference sets regulation point; 50-nA bias current demands high-impedance divider design. |
| 5. ON/OFF | Logic-controlled enable | Pull ≤1.3 V to enable; pull ≥1.3 V (up to 25 V) to disable; 80-μA standby current enables direct microcontroller GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal & current protection | Auto-shutdown at 150°C junction temp and >4.5-A peak switch current - eliminates need for external fault monitoring circuitry. |
| Fixed 150-kHz oscillator | Enables predictable EMI profile and simplifies filter design using standard 33–100-μH shielded inductors. |
| TTL-compatible ON/OFF control | Direct interface with 3.3-V or 5-V logic without level shifters; 80-μA shutdown current supports always-on supervisory circuits. |
| Low-feedback-bias-current sensing | 50-nA max Ib at FB pin - permits use of high-value resistor dividers (e.g., 100 kΩ/10 kΩ) minimizing quiescent divider loss. |
| Single-layer layout compatibility | 5-pin TO-263 footprint with thermal pad - supports cost-effective PCB manufacturing without buried vias or complex thermal stacks. |
Applications
| Industrial Power Supply | Embedded Control System |
|---|---|
Use Scenario: Regulating 24-V rail to 5-V/3.3-V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing clean, regulated DC power to microcontrollers, ADCs, and digital isolators. Use Value: 3-A capability supports multiple downstream LDOs or logic banks; ±4% output tolerance ensures reliable digital logic operation across temperature. | Use Scenario: Powering ARM Cortex-M based edge controllers in smart building gateways with variable peripheral loads. IC Role / Device Role / Timing Role: Main system regulator converting automotive-grade 12-V input to configurable 3.3-V or adjustable core voltage. Use Value: Adjustable output allows firmware-tuned voltage scaling; 150-kHz switching avoids AM radio band interference in RF-sensitive environments. |
| Test & Measurement Equipment | Home Theater Power Management |
Use Scenario: Generating stable ±12-V and +5-V rails for op-amp signal chains and DAC reference buffers in portable DMMs. IC Role / Device Role / Timing Role: High-PSRR, low-noise buck stage feeding low-dropout post-regulators for analog subsystems. Use Value: Excellent line/load regulation (<0.5%) maintains accuracy under varying battery or adapter input conditions. | Use Scenario: Converting 19-V laptop-style adapters to 12-V for motorized projector mounts and 5-V for HDMI CEC logic in AV receivers. IC Role / Device Role / Timing Role: Efficient mid-power conversion stage handling dynamic audio amplifier bias and logic sequencing loads. Use Value: TO-263 thermal pad enables silent convection cooling - critical for fanless home theater enclosures. |
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 through-hole package (NDH); higher RθJA (50°C/W vs. 20°C/W); identical electrical specs. | Suitable for prototyping or low-volume assemblies where manual soldering is preferred; less thermally efficient in dense layouts. | Select LM2596T-ADJ only when board assembly process does not support surface-mount TO-263 or when mechanical mounting requires screw terminals. |
| LMR51430RNXR | Synchronous buck; 4.5–36-V input; 3-A; 500-kHz/1.1-MHz selectable; integrated FETs; 95% peak efficiency. | Higher efficiency and smaller solution size, but requires external compensation and lacks TTL shutdown; no adjustable version below 0.8-V ref. | Choose LMR51430RNXR for new designs prioritizing efficiency >90% and compactness; LM2596S-ADJ remains optimal for legacy compatibility, simplicity, and robustness in industrial environments. |
Compared with LM2596T-ADJ, LM2596S-ADJ offers superior thermal performance in space-constrained SMT layouts; compared with LMR51430RNXR, it trades higher efficiency for simpler design, built-in protection, and direct logic-level shutdown - making it more suitable for ruggedized, maintenance-sensitive applications.
Availability
LM2596S-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded control systems, test equipment, and home theater electronics requiring stable component supply and long-term manufacturability.
Supply support for LM2596S-ADJ 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 highly reliable power conversion solutions.
The LM2596 series belongs to TI's SIMPLE SWITCHER® portfolio, designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and commercial power applications - emphasizing reliability over ultra-high efficiency.
FAQ
What is the minimum input voltage required for LM2596S-ADJ to regulate a 3.3-V output?
The LM2596S-ADJ requires a minimum input voltage of 4.5 V to maintain regulation at any output voltage, including 3.3 V. This accounts for dropout margin, switch saturation voltage (~1.4 V), and feedback loop headroom. Below 4.5 V, the device enters dropout and output voltage drops linearly with input.
Can LM2596S-ADJ be used in an inverting configuration to generate a negative output voltage?
Yes, LM2596S-ADJ supports inverting buck-boost topology to generate negative outputs (e.g., −5 V or −12 V) using the standard application circuit in TI's SNVS124G datasheet Figure 8-5. The ON/OFF threshold shifts to ~13 V in this configuration, and input-to-output voltage sum must remain ≤40 V.
What is the recommended inductor value for LM2596S-ADJ operating at 3 A output and 12-V input?
Texas Instruments recommends a 33-μH, 3.5-A rated shielded inductor for LM2596S-ADJ at 3-A load and 12-V input. This value ensures continuous conduction mode, manageable peak currents, and compatibility with standard off-the-shelf components such as Coilcraft XAL4020-332MEB.
Does LM2596S-ADJ require an external compensation network?
No, LM2596S-ADJ includes internal frequency compensation optimized for standard 33–100-μH inductors and electrolytic/tantalum output capacitors. No external compensation components are needed - simplifying design and improving stability across load and input variations.
How does the ON/OFF pin behave when left unconnected on LM2596S-ADJ?
When the ON/OFF pin is left floating or unconnected, LM2596S-ADJ defaults to enabled (ON) state due to internal pull-down behavior. For guaranteed operation, TI recommends tying the pin directly to GND if shutdown functionality is not used - avoiding noise-induced misoperation.
LM2596S-ADJ 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:
- Obsolete
- 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)
LM2596S-ADJ FAQ
1.How can I place an order for LM2596S-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596S-ADJ 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-ADJ reliable?
The price and inventory of LM2596S-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2596S-ADJ is usually 5 days.
3.What payment methods are accepted for LM2596S-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596S-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596S-ADJ?
LM2596S-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596S-ADJ 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-ADJ?
For technical support, including LM2596S-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596S-ADJ requirements.
6.How does Aetrix verify that LM2596S-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2596S-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2596S-ADJ?
All LM2596S-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2596S-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2596S-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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