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

onsemi LM2576D2T-3.3G

Name: LM2576D2T-3.3G
Brand: onsemi
SKU: LM2576D2T-3.3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2576D2T-3.3G

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Datasheet:: LM2576D2T-3.3G.pdf

Description:: IC REG BUCK 3.3V 3A D2PAK-5

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Product details

Overview

LM2576D2T-3.3G from onsemi is a monolithic 3.0 A, 52 kHz fixed-frequency step-down (buck) switching regulator with fixed 3.3 V output, designed for high-efficiency DC-DC conversion in industrial and embedded power supplies. It operates from 7.0 V to 40 V input, delivers ±4% output voltage tolerance over line/load/temperature, and integrates thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control.

For engineers reviewing the LM2576D2T-3.3G datasheet, pinout, applications, or equivalent options, key selection criteria include its D2PAK (TO-263) package with heatsink-connected Pin 3, 75% typical efficiency at 3.0 A, 1.5 V typical switch saturation voltage, and compatibility with standard off-the-shelf inductors such as Pulse PE-92108 (100 µH).

Technical Context

The LM2576D2T-3.3G implements a voltage-mode controlled buck topology with an internal 52 kHz oscillator, 1.235 V bandgap reference, and error amplifier driving a 1.0 A NPN switch. Its feedback loop senses output voltage directly at Pin 4 for fixed-output versions, eliminating external resistors.

Protection architecture includes thermal shutdown triggered at TJ ≥ 150 °C, peak current limiting (4.2–7.5 A depending on temperature), and automatic frequency foldback to ~18 kHz during overload to reduce average dissipation. Standby quiescent current is 80 µA typical when ON/OFF pin is pulled high.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 6–40 V input - ensures stable logic supply for 3.3 V microcontrollers and FPGAs without trimming.
Max Output Current	3.0 A continuous - supports single-rail power for mid-power digital subsystems without external pass devices.
Input Voltage Range	7.0 V to 40 V - accommodates 12 V/24 V industrial buses and wide-range unregulated adapters.
Switching Frequency	52 kHz ±10% (±2% from 0 °C to 125 °C) - enables use of low-cost, high-saturation-current inductors with minimal EMI filtering.
Efficiency	75% typical at Vin = 12 V, I_OUT = 3.0 A - reduces thermal load vs. linear regulators, often eliminating heatsinks in ambient ≤50 °C.
Thermal Resistance	R_θJC = 5.0 °C/W - allows direct heatsink mounting via Pin 3 (exposed pad) for high-power operation in compact layouts.
Shutdown Current	80 µA typical standby current - enables low-power sleep modes in battery-backed or energy-conscious systems.

Pinout & Package

D2PAK (TO-263-5) package with exposed thermal pad (terminal 6) internally connected to Pin 3 (GND); heatsink surface must be electrically tied to system ground for thermal and EMI performance.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vin	Positive input supply	Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR electrolytic bypass capacitor to suppress switching transients.
2 - Output	Emitter of internal NPN switch	Drives inductor; saturation voltage ≤1.8 V at 3.0 A limits conduction loss; PCB copper area must be minimized to reduce noise coupling.
3 - GND	Circuit ground / thermal pad connection	Reference for all internal circuitry; exposed pad (terminal 6) is electrically and thermally tied to this pin - must be soldered to large ground plane.
4 - Feedback	Regulated output voltage sense	Internally connected to 3.3 V divider; no external components required - simplifies layout and improves stability vs. adjustable versions.
5 - ON/OFF	TTL-compatible enable/disable control	Logic-high (>2.2 V) disables regulator, reducing input current to 80 µA; open or logic-low (<1.2 V) enables operation.

Key Features

Feature	Design Value
Integrated protection	Thermal shutdown + cycle-by-cycle current limiting + frequency foldback - eliminates need for external fault-handling circuitry in harsh environments.
Minimal external parts	Only 4 components required: input cap, output cap, catch diode (e.g., MBR360), and inductor - accelerates design and reduces BOM cost.
Standard inductor compatibility	Optimized for 100 µH pulse inductors (e.g., Pulse PE-92108) - avoids custom magnetics and enables rapid prototyping.
High efficiency at full load	75% typical at 3.0 A, Vin = 12 V - cuts power loss by >50% vs. linear regulators, easing thermal management in enclosed enclosures.
Robust input tolerance	Withstands 45 V transient input (max rating) - survives automotive load-dump surges and industrial line transients without clamping.

Applications

Industrial PLC I/O Module Power	Embedded Controller Core Supply
Use Scenario: Providing clean 3.3 V rail for ARM Cortex-M4 microcontrollers and isolated CAN transceivers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator converting 24 V field bus to regulated 3.3 V core voltage with ripple <100 mV_pp. Use Value: Delivers 3.0 A continuously with 75% efficiency, reducing heat generation in sealed enclosures and enabling convection-only cooling.	Use Scenario: Powering FPGA configuration banks and peripheral interfaces in edge AI gateways operating from 12 V wall adapters. IC Role / Device Role / Timing Role: Fixed-output step-down converter supplying stable 3.3 V to low-dropout post-regulators for sensitive analog sections. Use Value: ±4% output tolerance and integrated current limiting ensure reliable boot-up and sustained operation under dynamic load steps up to 2 A/µs.
Medical Sensor Signal Chain	Automotive Body Control Unit
Use Scenario: Generating 3.3 V for precision ADCs, op-amps, and wireless SoCs in portable patient monitors with battery backup. IC Role / Device Role / Timing Role: Main switching regulator in dual-stage supply (pre-regulator feeding LDOs), operating from 7–18 V Li-ion pack. Use Value: 80 µA standby current extends battery life during sleep mode; 52 kHz switching avoids audible noise in clinical environments.	Use Scenario: Converting 12 V vehicle battery to 3.3 V for microcontroller, EEPROM, and LIN transceiver in door module ECUs. IC Role / Device Role / Timing Role: Robust buck converter handling cold-crank (6.0 V) and load-dump (45 V) conditions per ISO 7637-2. Use Value: 40 V max operating input and 45 V absolute max rating provide margin against transients; D2PAK package enables mechanical mounting to metal chassis for EMI suppression.

Industrial PLC I/O Module Power

Embedded Controller Core Supply

Use Scenario: Providing clean 3.3 V rail for ARM Cortex-M4 microcontrollers and isolated CAN transceivers in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Primary DC-DC buck regulator converting 24 V field bus to regulated 3.3 V core voltage with ripple <100 mV_pp.

Use Value: Delivers 3.0 A continuously with 75% efficiency, reducing heat generation in sealed enclosures and enabling convection-only cooling.

Use Scenario: Powering FPGA configuration banks and peripheral interfaces in edge AI gateways operating from 12 V wall adapters.

IC Role / Device Role / Timing Role: Fixed-output step-down converter supplying stable 3.3 V to low-dropout post-regulators for sensitive analog sections.

Use Value: ±4% output tolerance and integrated current limiting ensure reliable boot-up and sustained operation under dynamic load steps up to 2 A/µs.

Medical Sensor Signal Chain

Automotive Body Control Unit

Use Scenario: Generating 3.3 V for precision ADCs, op-amps, and wireless SoCs in portable patient monitors with battery backup.

IC Role / Device Role / Timing Role: Main switching regulator in dual-stage supply (pre-regulator feeding LDOs), operating from 7–18 V Li-ion pack.

Use Value: 80 µA standby current extends battery life during sleep mode; 52 kHz switching avoids audible noise in clinical environments.

Use Scenario: Converting 12 V vehicle battery to 3.3 V for microcontroller, EEPROM, and LIN transceiver in door module ECUs.

IC Role / Device Role / Timing Role: Robust buck converter handling cold-crank (6.0 V) and load-dump (45 V) conditions per ISO 7637-2.

Use Value: 40 V max operating input and 45 V absolute max rating provide margin against transients; D2PAK package enables mechanical mounting to metal chassis for EMI suppression.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2576T-3.3G	TO-220-5 package (Case 314D); R_θJA = 65 °C/W vs. 70 °C/W for D2PAK; identical electrical specs.	Better natural convection cooling in open-frame designs; less suitable for high-density SMT layouts.	Select LM2576T-3.3G when heatsinking via clip or ambient airflow is preferred over PCB copper area.
MP1584EN-LF-Z	3 A, 1.5 MHz synchronous buck; smaller solution size; requires external compensation; no integrated catch diode.	Higher frequency enables 2.2 µH inductors and lower output capacitance; not drop-in compatible due to different pinout and control scheme.	Choose MP1584EN-LF-Z only when board space is critical and design resources exist for loop compensation and layout optimization.

Compared with LM2576T-3.3G, the LM2576D2T-3.3G offers superior thermal resistance to PCB (R_θJC = 5.0 °C/W) and surface-mount compatibility, while the MP1584EN-LF-Z trades simplicity and ruggedness for higher integration and density - making LM2576D2T-3.3G optimal for cost-sensitive, thermally constrained industrial applications requiring proven reliability.

Availability

LM2576D2T-3.3G is available at Aetrix Electronics and suitable for industrial PLCs, embedded controller power rails, medical sensor modules, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM2576D2T-3.3G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The LM2576 series was engineered as a rugged, low-component-count buck regulator family targeting cost-sensitive industrial and embedded power conversion where reliability, thermal robustness, and design simplicity outweigh ultra-high efficiency or miniaturization.

FAQ

What is the maximum input voltage the LM2576D2T-3.3G can withstand?

The LM2576D2T-3.3G has an absolute maximum input voltage rating of 45 V, though its recommended operating range is 7.0 V to 40 V. This 5 V margin accommodates transient overvoltages such as automotive load dump (ISO 7637-2) and industrial line surges. Operation beyond 40 V should be limited to short-duration transients, and sustained input above 40 V risks exceeding junction temperature limits even with adequate heatsinking.

Does the LM2576D2T-3.3G require an external feedback resistor network?

No, the LM2576D2T-3.3G does not require external feedback resistors. As a fixed-output version, it integrates an internal resistor divider that sets the regulated output to 3.3 V. Pin 4 (Feedback) is internally connected to this divider - leaving it unconnected or floating is correct. Adding external resistors would disrupt regulation and is not supported.

What is the thermal pad connection requirement for the LM2576D2T-3.3G D2PAK package?

The exposed thermal pad (terminal 6) of the LM2576D2T-3.3G is electrically and thermally connected to Pin 3 (GND). It must be soldered to a large, low-impedance PCB ground plane using multiple thermal vias. Failure to do so degrades thermal performance (R_θJA rises from 70 °C/W to >100 °C/W) and may cause premature thermal shutdown under 3.0 A load.

Can the LM2576D2T-3.3G be used in a negative-output (buck-boost) configuration?

Yes, the LM2576D2T-3.3G can be configured as a positive-to-negative converter per Figure 1 in the datasheet. In this topology, the "Output" pin (Pin 2) becomes the negative output terminal, and the "Ground" pin (Pin 3) serves as the return path. The 3.3 V regulation applies to the magnitude of the negative output; external diodes and capacitors must be repositioned per the standard buck-boost schematic.

What catch diode is recommended for the LM2576D2T-3.3G at 3.0 A output?

The onsemi-recommended catch diode for LM2576D2T-3.3G at full 3.0 A load is the MBR360 Schottky rectifier (3 A, 60 V, TO-220). Its low forward voltage (~0.55 V) minimizes conduction loss, and its fast recovery prevents reverse recovery spikes. For surface-mount designs, the MBRD360CT dual common-cathode variant is a validated alternative per Table 1 of the datasheet.

LM2576D2T-3.3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Packaging:: Tube

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive or Negative

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 7V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 3A

Frequency - Switching:: 52kHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK-5

LM2576D2T-3.3G FAQ

1.How can I place an order for LM2576D2T-3.3G through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2576D2T-3.3G 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 LM2576D2T-3.3G reliable?

The price and inventory of LM2576D2T-3.3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-3.3G is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-3.3G transactions.

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LM2576D2T-3.3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2576D2T-3.3G 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 LM2576D2T-3.3G?

For technical support, including LM2576D2T-3.3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-3.3G requirements.

6.How does Aetrix verify that LM2576D2T-3.3G is sourced from the original manufacturer or authorized distributors?

All LM2576D2T-3.3G 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 LM2576D2T-3.3G meets industry standards.

7.What is the process for return or replacement of LM2576D2T-3.3G?

All LM2576D2T-3.3G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-3.3G, 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 LM2576D2T-3.3G part is unused and in its original packaging.

Return procedure for LM2576D2T-3.3G:

1.Submit a request within 90 days.

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

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