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Texas Instruments LM2596T-ADJ/LF02
- Part No.:
- LM2596T-ADJ/LF02
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2596T-ADJ/LF02.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:626
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Product details
Overview
LM2596T-ADJ/LF02 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 robust, low-component-count buck regulation.
For engineers reviewing the LM2596T-ADJ/LF02 datasheet, LM2596T-ADJ/LF02 pinout, LM2596T-ADJ/LF02 application, or LM2596T-ADJ/LF02 equivalent, key selection criteria include its TO-220-5 package thermal performance, ON/OFF logic-controlled shutdown (80 μA standby), feedback bias current (≤50 nA), and compatibility with standard off-the-shelf inductors for rapid prototyping.
Technical Context
The LM2596T-ADJ/LF02 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, enabling precise regulation across line (4.5–40 V) and load (0.2–3 A) variations.
Protection features include two-stage current limiting (peak limit 3.6–6.9 A), thermal shutdown at 150°C junction temperature, and undervoltage lockout behavior enabled via the ON/OFF pin. The device operates in continuous conduction mode by default but supports discontinuous mode at light loads using reduced inductance values.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A maximum DC load - supports high-current rails without external pass devices |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial and automotive battery-supplied systems |
| Output Voltage Range | 1.2 V to 37 V adjustable (±4% max error) - enables flexible rail generation via external resistor divider |
| Switching Frequency | 150 kHz (±15%) - allows use of low-cost, high-saturation-current inductors and reduces EMI filtering burden |
| Feedback Voltage | 1.23 V (typical), 1.18–1.28 V over temperature - sets precision reference for external resistor ratio calculation |
| Quiescent Current | 80 μA typical in shutdown (ON/OFF ≥1.3 V) - minimizes system standby power draw |
| Thermal Resistance | RθJA = 50°C/W (TO-220, no heatsink) - defines minimum copper area and heatsinking requirements for 3-A operation |
Pinout & Package
LM2596T-ADJ/LF02 is supplied in a 5-pin TO-220 (NDH) package with vertical lead bend, 14.986 mm × 10.16 mm body size, and electrically isolated tab (connected to Pin 3, Ground). Thermal performance requires mounting to a heatsink or ≥1 in² of 1-oz copper on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Positive input supply | Accepts 4.5–40 V; requires local 100-μF low-ESR capacitor to suppress switching transients |
| 2: OUTPUT | Internal switch node | Drives external catch diode and inductor; high dv/dt node requiring minimal PCB copper area |
| 3: GROUND | Circuit reference | Common return for input/output capacitors, feedback network, and heatsink attachment point |
| 4: FEEDBACK | Voltage sense input | High-impedance (≤50 nA bias) node monitoring resistor divider; sensitive to noise coupling |
| 5: ON/OFF | Logic shutdown control | TTL-compatible: ≤1.3 V = ON, ≥1.3 V = OFF; 25 V absolute max rating; can be tied to GND if unused |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Automatically disables switching at 150°C junction temperature to prevent permanent damage during overload or poor heatsinking |
| Two-stage current limiting | First stage limits peak switch current to ~4.5 A; second stage reduces frequency under severe overload to limit power dissipation |
| Fixed-frequency oscillator | 150-kHz internal clock eliminates need for external timing components and simplifies EMI filter design |
| Low-external-component count | Requires only one inductor, one catch diode, and two capacitors - reduces BOM cost and layout complexity |
| Standard inductor compatibility | Works with widely available off-the-shelf 33–100 μH, 3.5–5 A saturation-current inductors (e.g., Coilcraft XAL, Bourns SRR) |
Applications
| Industrial Power Supply | Appliance Control Board |
|---|---|
Use Scenario: Generating stable 5-V or 12-V rails from unregulated 24-V DC bus in PLC I/O modules or motor drive logic sections. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated power to microcontrollers, sensors, and interface ICs. Use Value: Delivers 3-A output with ±4% regulation across wide input variation and load steps, eliminating need for post-regulation LDOs. | Use Scenario: Converting 12-V battery or adapter input to 3.3-V logic supply for MCU, display driver, and communication interfaces in smart home appliances. IC Role / Device Role / Timing Role: Main DC-DC converter supplying core logic voltage with programmable output via external resistors. Use Value: Adjustable output range (1.2–37 V) enables single BOM variant to support multiple appliance models with different rail requirements. |
| Grid Infrastructure Metering | EPOS Terminal Power |
Use Scenario: Providing isolated 5-V and ±12-V supplies for analog front-end circuitry and RS-485 transceivers in smart electricity meters operating from 9–36-V DC backup rails. IC Role / Device Role / Timing Role: Buck regulator generating primary analog supply; optionally configured as inverting regulator for negative bias rails. Use Value: Supports inverting topology (with external diodes) to generate −5 V or −12 V without additional ICs, reducing component count in space-constrained meter PCBs. | Use Scenario: Powering embedded ARM-based payment terminals with variable peripheral loads (LCD backlight, thermal printer, EMV reader) from 12-V wall adapter input. IC Role / Device Role / Timing Role: High-efficiency main power converter delivering 3-A peak current during printer activation bursts. Use Value: 80 μA shutdown quiescent current extends battery backup runtime during idle periods without sacrificing fast wake-up capability. |
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-263-5 surface-mount package; identical electrical specs; RθJA = 30°C/W with 2.5 in² copper vs. 50°C/W for TO-220 | Better thermal performance in compact layouts; requires reflow soldering and no through-hole mounting | Select when board space is constrained and automated assembly is used; not drop-in compatible due to package change |
| LMR51430RGER | Synchronous buck converter; 4.5–36 V input; 3 A output; 500 kHz/1.1 MHz switching; integrated high-side/low-side FETs | Higher efficiency (>90% typical), smaller solution size, no external catch diode required | Select for new designs prioritizing efficiency and footprint; requires redesign of feedback and compensation network |
Compared with LM2596T-ADJ/LF02, LM2596S-ADJ/NOPB offers superior thermal resistance in surface-mount form but demands PCB re-layout, while LMR51430RGER delivers higher efficiency and integration at the cost of increased design complexity and loss of direct pin compatibility.
Availability
LM2596T-ADJ/LF02 is available at Aetrix Electronics and suitable for industrial power supplies, appliance control boards, grid infrastructure metering, and EPOS terminal designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2596T-ADJ/LF02 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.
The LM2596 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in non-isolated DC-DC buck applications where reliability, thermal robustness, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2596T-ADJ/LF02?
The absolute maximum input voltage for LM2596T-ADJ/LF02 is 45 V, but the recommended operating range is 4.5 V to 40 V. Exceeding 40 V continuously risks exceeding thermal limits or triggering internal protection circuits. Operation at 40 V is validated across temperature and load conditions per datasheet Section 7.3, and the device maintains ±4% output regulation within this range when properly heatsinked.
Does LM2596T-ADJ/LF02 require an external catch diode, and what type is recommended?
Yes, LM2596T-ADJ/LF02 requires an external Schottky or fast-recovery diode connected between the OUTPUT pin and the output capacitor ground. A 3-A, 40-V Schottky diode (e.g., SB340, MBR340) is recommended for input voltages ≤24 V due to lower forward voltage drop and improved efficiency; fast-recovery diodes (e.g., FR304) are acceptable for higher input voltages where reverse leakage is less critical.
How is the output voltage set on LM2596T-ADJ/LF02?
The output voltage of LM2596T-ADJ/LF02 is set using a resistive divider between VOUT and GROUND, with the midpoint connected to the FEEDBACK pin. The formula is VOUT = 1.23 V × (1 + R1/R2), where R2 is typically 1.2 kΩ to 2.2 kΩ. The feedback bias current is ≤50 nA, so resistor values must balance accuracy (lower values reduce noise sensitivity) and power loss (higher values increase divider current error).
Can LM2596T-ADJ/LF02 be used in an inverting configuration to generate negative output voltages?
Yes, LM2596T-ADJ/LF02 supports inverting regulator configurations to generate negative outputs (e.g., −5 V, −12 V) by bootstrapping the GROUND pin to the negative rail and referencing the FEEDBACK pin to ground. This requires two additional diodes (D1, D3) and careful startup current management; TI provides verified schematics and inductor recommendations (e.g., 33 μH) in Section 8.3.3 of the LM2596 datasheet.
What thermal management is required for LM2596T-ADJ/LF02 at full 3-A load?
At 3-A continuous load with 12-V input and 5-V output, LM2596T-ADJ/LF02 dissipates ~3.5 W. With RθJA = 50°C/W (TO-220, no heatsink), junction temperature rise would exceed safe limits. A minimum 1-in² copper pour (1 oz.) is required, and a heatsink (e.g., 10°C/W) is strongly recommended. Thermal shutdown activates at 150°C junction temperature, so PCB layout must ensure low thermal resistance from tab to copper or heatsink.
LM2596T-ADJ/LF02 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/LF02 FAQ
1.How can I place an order for LM2596T-ADJ/LF02 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596T-ADJ/LF02 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/LF02 reliable?
The price and inventory of LM2596T-ADJ/LF02 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/LF02 is usually 5 days.
3.What payment methods are accepted for LM2596T-ADJ/LF02?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596T-ADJ/LF02 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596T-ADJ/LF02?
LM2596T-ADJ/LF02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596T-ADJ/LF02 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/LF02?
For technical support, including LM2596T-ADJ/LF02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596T-ADJ/LF02 requirements.
6.How does Aetrix verify that LM2596T-ADJ/LF02 is sourced from the original manufacturer or authorized distributors?
All LM2596T-ADJ/LF02 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/LF02 meets industry standards.
7.What is the process for return or replacement of LM2596T-ADJ/LF02?
All LM2596T-ADJ/LF02 units undergo pre-shipment inspection (PSI). If there is an issue with LM2596T-ADJ/LF02, 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/LF02 part is unused and in its original packaging.
Return procedure for LM2596T-ADJ/LF02:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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