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Texas Instruments LM2596T-ADJ/NOPB
- Part No.:
- LM2596T-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2596T-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:843
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Product details
Overview
LM2596T-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 - used in industrial power supplies requiring compact, low-component-count buck regulation.
For engineers reviewing the LM2596T-ADJ/NOPB datasheet, LM2596T-ADJ/NOPB pinout, LM2596T-ADJ/NOPB application, or LM2596T-ADJ/NOPB equivalent, key selection criteria include feedback voltage accuracy (1.23 V typ), ON/OFF logic threshold (1.3 V), standby current (80 µA typ), oscillator frequency stability (±15%), and TO-220 package thermal resistance (50 °C/W).
Technical Context
The LM2596T-ADJ/NOPB implements a voltage-mode controlled buck topology with internal 150-kHz oscillator, fixed-frequency PWM control, and built-in current-limit protection using two-stage frequency-reducing overload detection. It requires external diode, inductor, and input/output capacitors but integrates all active switching and feedback compensation circuitry.
Its feedback loop senses output voltage via a resistive divider referenced to the 1.23-V internal reference at the Feedback pin; shutdown is TTL-compatible via the ON/OFF pin (1.3-V threshold), and the internal switch exhibits 1.4-V typical saturation voltage at 3-A load - enabling efficient operation across wide input-output differentials.
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 12-V, 24-V, and 36-V nominal systems with margin for transients |
| Output Voltage Range | 1.2 V to 37 V adjustable - set by external resistor divider; ±4% max error over line/load/temp |
| Switching Frequency | 150 kHz fixed - enables use of standard off-the-shelf inductors and reduces EMI filtering complexity |
| Feedback Reference | 1.23 V ±2.5% - defines output voltage accuracy; Ib = 50 nA max ensures minimal divider current error |
| Standby Current | 80 µA typical - enables low-power system-level shutdown without auxiliary regulators |
| Thermal Protection | Internal junction shutdown at 150 °C - prevents damage during overload or poor heatsinking |
Pinout & Package
LM2596T-ADJ/NOPB is supplied in a 5-pin TO-220 (NDH) package with vertical lead bend, 14.986 mm × 10.16 mm body size, and integral heat slug electrically connected to Pin 3 (Ground). Thermal resistance is 50 °C/W junction-to-ambient (no heatsink), suitable for ≤2.5 W dissipation in free-air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts up to 40 V; requires local ceramic bypass capacitor to handle high di/dt switching currents |
| 2 - Output | Internal power switch drain | Swings between ~VIN–1.4 V and –0.5 V; PCB copper area must be minimized to reduce EMI coupling |
| 3 - Ground | Circuit reference and thermal path | Common return for all signals; tab connects to this pin - must be soldered to large copper pour for thermal management |
| 4 - Feedback | Voltage sense input | Compares divided output to 1.23-V internal reference; bias current ≤50 nA minimizes resistor-divider error |
| 5 - ON/OFF | Logic-controlled enable | ≤1.3 V = ON; ≥1.3 V = OFF; 80 µA standby current when disabled; clamped to 25 V max |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Automatically disables switching at 150 °C junction temperature - eliminates need for external thermal monitoring |
| Two-stage current limiting | Reduces switching frequency under overload instead of hard current limit - improves reliability during sustained fault conditions |
| TTL-compatible ON/OFF control | Direct interface to microcontroller GPIO without level-shifting - enables precise system power sequencing |
| Fixed-frequency 150-kHz oscillator | Predictable EMI profile and simplified filter design - avoids variable-frequency noise spreading complications |
| Low quiescent current (80 µA) | Enables battery-backed or energy-harvesting applications where standby power budget is <100 µA |
Applications
| Industrial Power Supply | Test & Measurement Equipment |
|---|---|
Use Scenario: Providing stable 5-V or 12-V rails for PLC I/O modules operating from 24-V DC field buses with transient immunity. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting unregulated 24-V bus to clean 5-V logic supply. Use Value: Delivers 3-A output with ±4% regulation across –40°C to +125°C ambient, eliminating need for post-regulation LDOs. | Use Scenario: Generating programmable analog supply voltages (e.g., ±15 V, ±5 V) in portable multimeters and signal generators. IC Role / Device Role / Timing Role: Adjustable buck core in dual-rail power tree, paired with inverting topology for negative outputs. Use Value: 1.2–37-V adjustability enables single BOM variant to support multiple output configurations without redesign. |
| Home Automation Hub | LED Driver Auxiliary Supply |
Use Scenario: Powering Wi-Fi/BLE SoCs, sensors, and relay drivers in smart home gateways powered from 12-V wall adapters. IC Role / Device Role / Timing Role: Main DC-DC converter supplying 3.3-V core and 5-V peripheral rails from shared 12-V input. Use Value: 150-kHz switching allows small, low-cost inductors and ceramic capacitors - reducing board space and BOM cost. | Use Scenario: Providing isolated 12-V bias for LED driver ICs in architectural lighting fixtures with 24–48-V DC input. IC Role / Device Role / Timing Role: Secondary buck stage generating gate-drive or logic supply independent of main LED current path. Use Value: Integrated current limit and thermal shutdown protect against LED string open-circuit faults that cause overvoltage stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ/NOPB | TO-263 surface-mount package (KTT); identical electrical specs; RθJA = 30 °C/W with 2.5-in² copper | Better thermal performance in space-constrained PCB layouts; requires reflow assembly instead of through-hole | Select for automated SMT production or higher power density designs where heatsinking is limited |
| LMR51430RGER | Synchronous buck; 4.5–36-V input; 3-A; 500-kHz/1.1-MHz selectable; integrated high-side/low-side FETs | Higher efficiency (>90% at light loads), smaller solution size, no external diode required | Select when efficiency >85% across 10-mA–3-A load range is critical, or when minimizing external component count is prioritized |
Compared with LM2596T-ADJ/NOPB, LM2596S-ADJ/NOPB offers identical regulation performance in a thermally superior surface-mount package, while LMR51430RGER delivers higher efficiency and integration at the cost of increased complexity in layout and control-loop tuning.
Availability
LM2596T-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, test equipment, home automation hubs, and LED driver auxiliary supplies requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM2596T-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 design, minimal external components, and robust thermal/overload protection are essential.
FAQ
What is the minimum input voltage required for LM2596T-ADJ/NOPB to regulate at 3.3 V output?
The LM2596T-ADJ/NOPB requires a minimum input voltage of 4.5 V to maintain regulation at 3.3 V output, per its specified operating conditions. This accounts for dropout due to internal 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 LM2596T-ADJ/NOPB be used in an inverting configuration to generate negative output voltages?
Yes, LM2596T-ADJ/NOPB supports inverting buck-boost topology per TI's Figure 8-5. It generates negative outputs (e.g., –5 V, –12 V) by bootstrapping the ground pin to the negative rail and referencing feedback to ground. Input-to-output voltage sum must remain ≤40 V, and startup current peaks near 4.5 A require careful input capacitance sizing.
What is the exact feedback reference voltage for LM2596T-ADJ/NOPB, and how does it affect output accuracy?
The LM2596T-ADJ/NOPB uses a precision 1.23-V internal reference at the Feedback pin, with ±2.5% tolerance over temperature. Output voltage accuracy depends directly on this reference and the resistor divider ratio; typical total output error is ±4% over line, load, and temperature due to reference drift, divider tolerance, and amplifier offset.
Does LM2596T-ADJ/NOPB require an external catch diode, and what type is recommended?
Yes, LM2596T-ADJ/NOPB requires an external Schottky or fast-recovery diode connected from the Output pin to the output capacitor ground. For inputs ≤24 V, a 3-A Schottky diode (e.g., SB560) is recommended to minimize forward drop and conduction loss; for higher inputs, a fast-recovery diode with <50 ns reverse recovery time is preferred to reduce switching losses.
How does the ON/OFF pin function in LM2596T-ADJ/NOPB, and what logic levels activate it?
The ON/OFF pin of LM2596T-ADJ/NOPB enables TTL-compatible shutdown: pulling the pin below 1.3 V (at 25°C) turns the regulator ON; pulling it above 1.3 V shuts it down, reducing total input current to 80 µA typical. The pin is internally clamped to 25 V maximum and draws <15 µA when asserted - allowing direct connection to MCU GPIO pins without buffering.
LM2596T-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2596T-ADJ/NOPB FAQ
1.How can I place an order for LM2596T-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596T-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 LM2596T-ADJ/NOPB reliable?
The price and inventory of LM2596T-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 LM2596T-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2596T-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596T-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596T-ADJ/NOPB?
LM2596T-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596T-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 LM2596T-ADJ/NOPB?
For technical support, including LM2596T-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596T-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2596T-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2596T-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 LM2596T-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2596T-ADJ/NOPB?
All LM2596T-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2596T-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 LM2596T-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2596T-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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