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Texas Instruments LM2596S-ADJ/NOPB
- Part No.:
- LM2596S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596S-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
LM2596S-ADJ/NOPB from Texas Instruments is a nonsynchronous step-down DC-DC converter IC delivering up to 3 A output current with 1.2 V to 37 V adjustable output voltage (±4% tolerance), 150 kHz fixed switching frequency, and input voltage range up to 40 V. It serves as the primary voltage regulator in compact, cost-sensitive power supplies for embedded systems requiring stable mid-power conversion.
For engineers reviewing the LM2596S-ADJ/NOPB datasheet, LM2596S-ADJ/NOPB pinout, LM2596S-ADJ/NOPB application, or LM2596S-ADJ/NOPB equivalent, key selection criteria include its 3-A load capability, ±4% output voltage accuracy over line/load/temperature, TTL-compatible ON/OFF control, thermal shutdown protection, and compatibility with standard off-the-shelf inductors - all critical for industrial, appliance, and consumer power supply design.
Technical Context
The LM2596S-ADJ/NOPB integrates a PWM controller, power switch, and internal frequency compensation into a monolithic buck regulator. Its fixed 150 kHz oscillator enables predictable filter design using low-cost, high-saturation-current inductors and ceramic or electrolytic output capacitors.
Operation relies on external feedback via a resistor divider connected to the Feedback pin (VFB = 1.23 V typical), with built-in two-stage current limiting and thermal shutdown ensuring fault resilience. The ON/OFF pin supports logic-level shutdown with ≤200 μA standby current, while the Output pin switches between ≈(VIN − VSAT) and ≈−0.5 V at duty cycle VOUT/VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports mid-power loads without external current boosting |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input 12 V/24 V industrial rails and unregulated AC-DC outputs |
| Adjustable Output Range | 1.2 V to 37 V ±4% - enables single-part flexibility across multiple system voltage domains |
| Switching Frequency | 150 kHz (±15%) - balances efficiency, EMI, and passive component size; avoids AM radio band |
| Feedback Reference Voltage | 1.23 V ±2.7% - sets output via external resistor divider; enables precise programmability |
| Quiescent Current (ON) | 5–10 mA - minimizes no-load power loss in always-on subsystems |
| Standby Current (OFF) | 80–250 μA - enables ultra-low-power sleep modes in battery-backed or energy-conscious designs |
| Saturation Voltage | 1.16–1.5 V at 3 A - defines conduction loss and impacts minimum dropout under heavy load |
Pinout & Package
LM2596S-ADJ/NOPB is supplied in the TO-263-5 (KTT) surface-mount package: 10.10 mm × 8.89 mm body, exposed thermal pad for enhanced heat dissipation, compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts up to 40 V; requires local bypass capacitor to suppress switching transients and supply peak currents |
| 2 - Output | Internal power switch drain | Swings between ≈(VIN − VSAT) and ≈−0.5 V; PCB copper area must be minimized to reduce EMI coupling |
| 3 - Ground | Circuit reference node | Common return for input/output paths and feedback network; connects to thermal pad for thermal management |
| 4 - Feedback | Voltage sense input | Monitors regulated output via resistor divider; 1.23 V reference enables precise output programming |
| 5 - ON/OFF | Logic-controlled enable | Pull ≤1.3 V to enable; pull ≥1.3 V to disable; draws ≤15 μA; supports undervoltage lockout and delayed start-up |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Halts operation above 150°C junction temperature - prevents permanent damage during overload or poor heatsinking |
| Two-stage current limiting | First stage limits peak switch current to 3.6–7.5 A; second stage reduces switching frequency under sustained overload - improves reliability vs. hard current limit |
| Fixed-frequency oscillator | 150 kHz operation enables consistent EMI filtering and simplifies compliance testing without variable-frequency spread-spectrum complexity |
| Low-component-count design | Requires only four external parts (inductor, catch diode, input/output capacitors) - reduces BOM cost and layout risk versus controller-based solutions |
| TTL-compatible shutdown | ON/OFF pin accepts 0–25 V logic signals - allows direct interfacing with microcontrollers, FPGAs, or discrete logic without level-shifting |
| Standard inductor compatibility | Works with widely available 33–100 μH, 3.5–5 A saturation-current inductors - eliminates custom magnetics and accelerates prototyping |
Applications
| Industrial Power Supplies | Consumer Audio Amplifiers |
|---|---|
|
Use Scenario: Providing clean, regulated 15 V and ±12 V rails for analog audio front-ends and op-amp stages in home theater receivers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V DC bus to dual-polarity analog supply rails. Use Value: Delivers 3 A total output with <±4% regulation across temperature, minimizing audible hum and distortion caused by supply ripple or drift. |
Use Scenario: Generating stable 5 V and 3.3 V logic supplies from a shared 12 V wall adapter in smart speaker control boards. IC Role / Device Role / Timing Role: Adjustable buck converter configured as dual-output rail generator via resistor-divider tuning and sequencing. Use Value: Enables single-IC solution for multi-rail logic domains with minimal external components and no need for secondary LDOs. |
| Appliance Control Modules | Grid Infrastructure Sensors |
|
Use Scenario: Powering MCU, display, and relay drivers in washing machine main control boards operating from rectified AC mains. IC Role / Device Role / Timing Role: Main DC-DC converter stepping down 30–40 V unregulated DC to 5 V for digital subsystems. Use Value: Withstands 40 V input surges and delivers 3 A peak current for motor driver gate charging, while maintaining <100 mV line regulation. |
Use Scenario: Supplying 3.3 V to precision ADCs and wireless transceivers in outdoor smart meter sensor nodes powered by solar-charged batteries. IC Role / Device Role / Timing Role: High-efficiency buck regulator converting 12–36 V battery/solar input to low-noise 3.3 V for RF and sensing circuits. Use Value: Achieves >73% efficiency at 3 A load and draws only 80 μA in shutdown - extending battery life during extended idle periods. |
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/NOPB | 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 or heatsink mounting is preferred | Select when mechanical mounting constraints favor leaded packages or when thermal performance requirements are less stringent |
| LMR51430RNXR | Synchronous buck; 4.5–36 V input; 3 A; 500 kHz/1.1 MHz; integrated high-side/low-side MOSFETs; 92% peak efficiency | Higher efficiency, smaller solution size, and lower EMI - but requires more complex layout and lacks adjustable VFB pin | Choose for new designs prioritizing efficiency, board space, and modern synchronous architecture over legacy compatibility |
Compared with LM2596S-ADJ/NOPB, LM2596T-ADJ/NOPB offers identical regulation performance in a through-hole format ideal for breadboarding, while LMR51430RNXR provides superior efficiency and integration at the cost of design complexity and loss of direct VFB adjustability - making LM2596S-ADJ/NOPB optimal for cost-sensitive, thermally tolerant, and layout-simple applications.
Availability
LM2596S-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, appliance control modules, grid infrastructure sensors, and consumer audio amplifiers requiring stable component supply across long production lifecycles.
Supply support for LM2596S-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 reliable, high-volume power conversion ICs.
The LM2596 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, minimal external component count, and robust operation in cost-sensitive industrial and consumer power applications.
FAQ
What is the maximum input voltage rating for LM2596S-ADJ/NOPB?
The absolute maximum input voltage for LM2596S-ADJ/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 thermal shutdown or degrade long-term reliability. For designs near the upper limit, ensure adequate heatsinking and verify transient immunity per IEC 61000-4-5.
How do I set the output voltage of LM2596S-ADJ/NOPB?
LM2596S-ADJ/NOPB uses a resistor divider from output to ground, with the midpoint connected to the Feedback pin. Set output voltage using VOUT = 1.23 V × (1 + R1/R2), where R2 connects to ground. Typical values are R2 = 1.2 kΩ and R1 = 10 kΩ for ~12 V output. Ensure resistors have ≤1% tolerance and ≤100 ppm/°C TCR for ±4% final accuracy.
Does LM2596S-ADJ/NOPB require an external catch diode?
Yes, LM2596S-ADJ/NOPB requires an external Schottky or fast-recovery diode (e.g., SB560, MBR360) connected from the Output pin to the output capacitor's positive terminal. This diode provides the freewheeling path during the switch-off period. Omitting it causes catastrophic failure due to inductive kickback and violates the device's safe operating conditions.
What thermal performance can I expect from LM2596S-ADJ/NOPB in TO-263 package?
In the TO-263-5 (KTT) package, LM2596S-ADJ/NOPB achieves RθJA of 20–30°C/W depending on PCB copper area: 20°C/W with 3 in² of 1-oz copper on the component side and 16 in² on the opposite side. With minimal copper (0.5 in²), RθJA rises to ~50°C/W. Always solder the exposed thermal pad to maximize heat transfer and avoid exceeding 150°C junction temperature.
Can LM2596S-ADJ/NOPB be used in inverting (negative-output) configurations?
Yes, LM2596S-ADJ/NOPB supports inverting topologies per TI's Figure 8-5. In this mode, the Ground pin floats at the negative output voltage, and the Feedback pin is referenced to system ground. Output current capability depends on VIN and |VOUT|; maximum input-to-output voltage sum must remain ≤40 V. Startup surge current can reach 4.5 A, requiring careful input capacitance and delayed start-up design.
LM2596S-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:
- Tube
- 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)
LM2596S-ADJ/NOPB FAQ
1.How can I place an order for LM2596S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596S-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 LM2596S-ADJ/NOPB reliable?
The price and inventory of LM2596S-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 LM2596S-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596S-ADJ/NOPB?
LM2596S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596S-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 LM2596S-ADJ/NOPB?
For technical support, including LM2596S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2596S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596S-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 LM2596S-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596S-ADJ/NOPB?
All LM2596S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596S-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 LM2596S-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2596S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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