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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

onsemi LM2576T-ADJ

Name: LM2576T-ADJ
Brand: onsemi
SKU: LM2576T-ADJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2576T-ADJ

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-220-5

Datasheet:: LM2576T-ADJ.pdf

Description:: IC REG BUCK ADJ 3A TO220-5

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Inventory:1,471

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Product details

Overview

LM2576T-ADJ from onsemi is a monolithic 3.0 A step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), 52 kHz fixed-frequency internal oscillator, and integrated 3.0 A NPN switch. It features thermal shutdown, cycle-by-cycle current limiting, TTL-compatible ON/OFF control, and ±4% output voltage tolerance over line/load/temperature. Used in high-efficiency DC-DC conversion for industrial power supplies and embedded systems.

For engineers reviewing the LM2576T-ADJ datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for production-grade implementation.

Technical Context

The LM2576T-ADJ implements a voltage-mode controlled buck converter with a built-in 52 kHz oscillator, error amplifier referenced to a 1.23 V internal bandgap, and a 3.0 A NPN output switch. Its feedback pin directly connects to the error amplifier's non-inverting input, enabling external resistor programming of output voltage.

It supports logic-level shutdown via Pin 5 (ON/OFF), drawing only 80 µA standby current when disabled. Protection includes thermal shutdown and peak-current limiting (4.2–7.5 A range), with saturation voltage ≤2.0 V across −40 °C to +125 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Guaranteed 3.0 A continuous load capability - enables single-chip replacement of linear regulators in medium-power applications without heatsink under typical conditions.
Output Voltage Range	1.23 V to 37 V adjustable via external resistors - supports custom rail generation (e.g., 8 V, 18 V, 24 V) without redesigning core regulator circuitry.
Oscillator Frequency	52 kHz (±10% over full temp range) - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., Pulse PE-92108) and reduces EMI compared to MHz-range converters.
Feedback Reference	1.23 V ±4% (−40 °C to +125 °C) - sets absolute accuracy limit for programmed output; requires precision resistors (e.g., 1% metal film) for <1% output error.
Input Voltage Range	7.0 V to 40 V DC - accommodates wide-input industrial or automotive-derived supplies while maintaining regulation down to 7 V minimum dropout.
Shutdown Current	80 µA typical at 25 °C - allows ultra-low-power system sleep modes; compatible with microcontroller GPIO without level-shifting.
Saturation Voltage	≤2.0 V at 3.0 A and −40 °C to +125 °C - defines minimum headroom needed between input and output; impacts efficiency and thermal design at high I_OUT.

Pinout & Package

LM2576T-ADJ uses the TO-220-5 (Case 314D) package with heatsink surface electrically connected to Pin 3 (GND). The exposed tab provides low thermal resistance (R_JC = 5.0 °C/W) for direct mounting to PCB copper or external heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vin	Positive input supply	Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR electrolytic capacitor to suppress switching transients and sustain peak current.
2 - Output	Emiter of internal NPN switch	Switch node connecting to inductor; PCB copper area must be minimized to reduce EMI coupling into sensitive analog sections.
3 - GND	Circuit ground reference	Common return for input cap, output cap, and feedback network; must be single-point grounded near IC to avoid noise injection into feedback path.
4 - Feedback	Error amplifier input	Direct connection to external resistor divider; trace must be short and shielded from noisy nodes to prevent regulation instability or ripple injection.
5 - ON/OFF	Logic-enable control input	TTL-compatible shutdown: ≤1.0 V (on), ≥2.2 V (off); draws <30 µA when active; enables system-level power sequencing and battery-saving modes.

Key Features

Feature	Design Value
Integrated 3.0 A NPN switch	Eliminates need for external MOSFET/driver; simplifies layout and reduces BOM count - only 4 external components required for full operation.
Fixed 52 kHz switching frequency	Enables predictable filter design and EMI filtering; avoids audible noise and aligns with standard inductor vendor catalogs optimized for this frequency.
±4% output voltage tolerance	Specifies worst-case deviation across input voltage, load current, and temperature - defines minimum margin needed in downstream circuitry (e.g., ADC reference, MCU V_CC).
Cycle-by-cycle current limiting	Protects against short-circuit and overload without latch-up; allows safe restart after fault removal - no external current-sense resistor required.
Thermal shutdown with hysteresis	Activates at ~150 °C junction temperature and releases at ~135 °C - prevents permanent damage during sustained overload or poor heatsinking.

Applications

Industrial Power Supply	Embedded System Pre-Regulator
Use Scenario: Generating stable 12 V or 15 V rails from 24 V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering up to 3.0 A with minimal external components and no heatsink required at ambient ≤50 °C. Use Value: Replaces inefficient linear pre-regulators, reducing board-level heat by >60% and eliminating need for forced-air cooling in enclosed cabinets.	Use Scenario: Providing clean 5.0 V intermediate rail for microcontroller, memory, and peripheral ICs in battery-powered edge devices. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-dropout linear regulators (LDOs) to meet tight noise and transient requirements. Use Value: Achieves >77% efficiency at 3.0 A load, extending battery life and enabling smaller battery packs versus linear-only solutions.
On-Card Switching Regulator	Battery Charger Power Stage
Use Scenario: Local 3.3 V or adjustable 8.0 V supply on FPGA carrier boards where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using standard through-hole inductors and electrolytic capacitors. Use Value: Reduces component footprint vs. multi-chip alternatives; TO-220 package allows direct heatsink attachment without thermal vias.	Use Scenario: Constant-voltage stage in 12 V lead-acid or LiFePO₄ battery chargers accepting 18–36 V input. IC Role / Device Role / Timing Role: Adjustable-output buck controller set to 14.4 V or 14.6 V float voltage with precise 1.23 V reference and external resistor scaling. Use Value: Enables accurate charge voltage control within ±0.1 V using 0.1% resistors - critical for battery longevity and safety compliance.

Industrial Power Supply

Embedded System Pre-Regulator

Use Scenario: Generating stable 12 V or 15 V rails from 24 V factory bus for PLC I/O modules and sensor interfaces.

IC Role / Device Role / Timing Role: Primary step-down regulator delivering up to 3.0 A with minimal external components and no heatsink required at ambient ≤50 °C.

Use Value: Replaces inefficient linear pre-regulators, reducing board-level heat by >60% and eliminating need for forced-air cooling in enclosed cabinets.

Use Scenario: Providing clean 5.0 V intermediate rail for microcontroller, memory, and peripheral ICs in battery-powered edge devices.

IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-dropout linear regulators (LDOs) to meet tight noise and transient requirements.

Use Value: Achieves >77% efficiency at 3.0 A load, extending battery life and enabling smaller battery packs versus linear-only solutions.

On-Card Switching Regulator

Battery Charger Power Stage

Use Scenario: Local 3.3 V or adjustable 8.0 V supply on FPGA carrier boards where space and thermal budget are constrained.

IC Role / Device Role / Timing Role: Compact, self-contained buck converter using standard through-hole inductors and electrolytic capacitors.

Use Value: Reduces component footprint vs. multi-chip alternatives; TO-220 package allows direct heatsink attachment without thermal vias.

Use Scenario: Constant-voltage stage in 12 V lead-acid or LiFePO₄ battery chargers accepting 18–36 V input.

IC Role / Device Role / Timing Role: Adjustable-output buck controller set to 14.4 V or 14.6 V float voltage with precise 1.23 V reference and external resistor scaling.

Use Value: Enables accurate charge voltage control within ±0.1 V using 0.1% resistors - critical for battery longevity and safety compliance.

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	Higher 150 kHz switching frequency; lower 1.23 V reference tolerance (±2%); 3.0 A rating but higher R_DS(on) and thermal resistance in TO-220 package.	Better suited for compact designs needing smaller inductors/caps; less ideal for high-ambient-temperature environments due to higher thermal impedance.	Select LM2596T-ADJ only if board space is critical and thermal margin exceeds 25 °C above ambient.
MP1584EN-LF-Z	42 V max input; 3 A output; 1.5 MHz switching; requires external compensation; no integrated thermal shutdown hysteresis.	Designed for high-density consumer electronics; lacks built-in protection features and fixed-frequency simplicity of LM2576T-ADJ.	Choose MP1584EN-LF-Z when EMI filtering and small magnetics are mandatory, and system-level thermal monitoring is already implemented.

Compared with LM2576T-ADJ, LM2596T-ADJ trades thermal robustness for size reduction, while MP1584EN-LF-Z shifts design complexity to external compensation and protection - making LM2576T-ADJ optimal for industrial reliability and ease-of-use where 52 kHz and integrated safeguards are prioritized.

Availability

LM2576T-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across manufacturing lots.

Supply support for LM2576T-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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, signal processing, and sensing technologies for automotive, industrial, and cloud infrastructure markets.

The LM2576 series was designed as a rugged, easy-to-implement buck regulator family targeting cost-sensitive industrial and embedded applications where reliability, thermal resilience, and minimal external component count are essential.

FAQ

What is the maximum input voltage for LM2576T-ADJ?

The absolute maximum input voltage for LM2576T-ADJ is 45 V, but the recommended operating maximum is 40 V DC. Exceeding 40 V risks violating the device's internal transistor breakdown limits and may trigger premature thermal shutdown or reduce long-term reliability. The datasheet specifies guaranteed operation up to 40 V across the full −40 °C to +125 °C junction temperature range. Always include input transient suppression (e.g., TVS diode) if surge conditions exceed 40 V.

How do I calculate output voltage for LM2576T-ADJ?

LM2576T-ADJ output voltage is set by two external resistors: V_OUT = 1.23 V × (1 + R2/R1), where R1 connects from Feedback (Pin 4) to GND and R2 connects from Output (Pin 2) to Feedback (Pin 4). R1 should be 1.0 kΩ to 5.0 kΩ; 1% metal-film resistors are recommended for stability. For example, R1 = 1.2 kΩ and R2 = 6.12 kΩ yields V_OUT = 1.23 × (1 + 6.12/1.2) = 7.5 V. The LM2576T-ADJ datasheet confirms this formula applies across all operating conditions.

Does LM2576T-ADJ require a heatsink?

LM2576T-ADJ does not require a heatsink under light loads (<1 A) and moderate ambient temperatures (<40 °C), but thermal analysis is mandatory for full 3.0 A operation. With R_JA = 65 °C/W (TO-220-5), dissipation of 3.0 W raises junction temperature by 195 °C above ambient - exceeding the 150 °C limit. A heatsink lowering R_JA to ≤30 °C/W or PCB copper pour with thermal vias is required for continuous 3.0 A output. The LM2576T-ADJ datasheet specifies R_JC = 5.0 °C/W, confirming heatsink interface quality is critical.

What diode should I use with LM2576T-ADJ?

Use a Schottky diode rated ≥1.2× the maximum load current and ≥1.25× the maximum input voltage. For LM2576T-ADJ at 3.0 A and 40 V input, select a 3.0–5.0 A, ≥50 V Schottky (e.g., MBR360, SR306, or 1N5822). The LM2576T-ADJ datasheet explicitly recommends MBR360 for 40 V input and lists it in Table 1. Fast-recovery diodes like MUR420 are acceptable but increase conduction loss and reduce efficiency by ~2–3% versus Schottky.

Can LM2576T-ADJ be used in negative-output configurations?

Yes - LM2576T-ADJ can configure as a negative-output buck-boost converter by grounding the Output pin (Pin 2) and taking output from the inductor–diode junction, per Figure 1 in the LM2576T-ADJ datasheet. This inverts polarity while retaining regulation. However, the feedback network must be re-referenced to the new output ground, and the ON/OFF pin logic remains referenced to the original input ground. The LM2576T-ADJ datasheet confirms this topology under "Negative Step-Up Converters" in Applications.

LM2576T-ADJ Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-5

Packaging:: Tube

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive or Negative

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 7V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 1.23V

Voltage - Output (Max):: 37V

Current - Output:: 3A

Frequency - Switching:: 52kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-5

LM2576T-ADJ FAQ

1.How can I place an order for LM2576T-ADJ through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2576T-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 LM2576T-ADJ reliable?

The price and inventory of LM2576T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-ADJ is usually 5 days.

3.What payment methods are accepted for LM2576T-ADJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-ADJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2576T-ADJ?

LM2576T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2576T-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 LM2576T-ADJ?

For technical support, including LM2576T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-ADJ requirements.

6.How does Aetrix verify that LM2576T-ADJ is sourced from the original manufacturer or authorized distributors?

All LM2576T-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 LM2576T-ADJ meets industry standards.

7.What is the process for return or replacement of LM2576T-ADJ?

All LM2576T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-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 LM2576T-ADJ part is unused and in its original packaging.

Return procedure for LM2576T-ADJ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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