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

onsemi LM2576D2T-ADJR4

Name: LM2576D2T-ADJR4
Brand: onsemi
SKU: LM2576D2T-ADJR4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2576D2T-ADJR4

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: LM2576D2T-ADJR4.pdf

Description:: IC REG BUCK ADJ 3A D2PAK-5

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Product details

Overview

LM2576D2T-ADJR4 from onsemi is a 3.0 A, adjustable-output step-down (buck) switching regulator in D2PAK (TO-263) package, featuring 52 kHz fixed-frequency operation, ±4% output voltage accuracy over line/load/temperature, cycle-by-cycle current limiting, and thermal shutdown. It delivers regulated DC output from 1.23 V to 37 V with input range 7.0–40 V, widely used in industrial power supplies and battery-charged systems.

For engineers reviewing the LM2576D2T-ADJR4 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, internal 1.23 V reference tolerance (±2% over 0 °C to 125 °C), 80 µA standby quiescent current under TTL shutdown, and D2PAK thermal resistance (R_JC = 5.0 °C/W).

Technical Context

The LM2576D2T-ADJR4 implements a voltage-mode controlled buck converter with an integrated 3.0 A NPN switch, 52 kHz oscillator, and error amplifier referenced to a 1.23 V bandgap. Its feedback pin directly connects to the external resistor divider, enabling precise output programming without internal voltage division.

Protection architecture includes cycle-by-cycle peak-current limiting (typ. 5.8 A at 25 °C), thermal shutdown activation at T_J ≥ 150 °C, and TTL-compatible ON/OFF control with 1.4 V threshold. The device operates across −40 °C to +125 °C junction temperature and supports stable regulation down to 1.23 V output using external R1/R2.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Guaranteed 3.0 A continuous load capability - enables single-regulator solutions for mid-power embedded systems without external current boosting.
Input Voltage Range	7.0 V to 40 V - supports wide-range unregulated inputs including 12 V/24 V industrial rails and automotive battery-derived supplies.
Feedback Reference	1.23 V ±2% (0 °C to 125 °C) - sets minimum programmable output voltage and defines accuracy of externally scaled outputs.
Oscillator Frequency	52 kHz ±10% (−40 °C to +125 °C) - fixed frequency simplifies EMI filtering and enables use of standard off-the-shelf inductors optimized for 50–60 kHz.
Standby Quiescent Current	80 µA typical at 25 °C - allows low-power shutdown mode suitable for battery-backed or energy-conscious applications.
Saturation Voltage	1.5 V typical at I_OUT = 3.0 A - determines conduction loss in high-duty-cycle operation and impacts minimum dropout capability.
Thermal Resistance (Junction-to-Case)	5.0 °C/W - enables direct heatsink mounting via exposed tab (Pin 3), supporting >2 W dissipation with modest heatsinking.

Pinout & Package

D2PAK (TO-263) package with exposed metal tab thermally and electrically connected to Pin 3 (GND). Heatsink surface must be isolated from other circuit potentials except ground. Moisture Sensitivity Level (MSL) = 1 - no floor life limitation; suitable for standard reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vin	Positive input supply	Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR aluminum electrolytic bypass capacitor placed near pin.
2 - Output	Emiter of internal NPN switch	Switching 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/output capacitors, feedback network, and heatsink interface; single-point grounding recommended.
4 - Feedback	Error amplifier non-inverting input	Direct connection point for external R1/R2 divider; high-impedance node (I_b ≤ 100 nA) requiring short trace routing near IC.
5 - ON/OFF	TTL-compatible enable/disable control	Logic-high (>2.2 V) disables regulator and reduces I_Q to 80 µA; open or logic-low (<1.2 V) enables operation.

Key Features

Feature	Design Value
Adjustable output range	1.23 V to 37 V via two-resistor divider - eliminates need for multiple fixed-voltage SKUs and supports custom rail generation.
Internal protection	Cycle-by-cycle current limit + thermal shutdown - prevents damage during overload, short-circuit, or inadequate heatsinking without external circuitry.
Low standby current	80 µA typical shutdown current - extends battery life in portable equipment and enables remote wake-up via microcontroller GPIO.
Standard inductor compatibility	Optimized for 52 kHz operation - allows use of widely available, cost-effective pulse inductors (e.g., Pulse PE-92108, Renco RL2444).
Robust ESD rating	2.0 kV HBM - ensures handling survivability during manufacturing and board assembly without special ESD precautions.

Applications

Industrial Power Supply	Automotive Battery Charger
Use Scenario: On-board 5 V/3.3 V logic supply in PLC modules powered from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V nominal input to stable 5 V output for microcontroller, I/O drivers, and communication interfaces. Use Value: Delivers full 3.0 A at >77% efficiency (Vin = 12 V), reducing thermal load versus linear regulators and eliminating need for large heatsinks.	Use Scenario: Constant-current/constant-voltage stage in 12 V lead-acid battery charger with microcontroller supervision. IC Role / Device Role / Timing Role: Adjustable buck controller set to 13.8 V float voltage, dynamically reconfigured via DAC-controlled feedback resistors. Use Value: ±4% output accuracy ensures precise battery voltage regulation; ON/OFF pin enables charge termination and sleep mode coordination.
Embedded System Pre-regulator	POS Terminal Power Management
Use Scenario: Intermediate 5 V rail feeding low-dropout linear regulators for noise-sensitive analog sensors and ADCs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 12 V or 24 V system input before final LDO conditioning. Use Value: Reduces power dissipation in downstream LDOs by lowering input-to-output differential; 52 kHz switching avoids audible noise in consumer-facing devices.	Use Scenario: Multi-rail power solution in retail point-of-sale terminals requiring 12 V for printer, 5 V for display, and 3.3 V for processor. IC Role / Device Role / Timing Role: Configurable buck regulator generating 12 V output (via R1/R2), with secondary converters derived from same input bus. Use Value: Single-component solution for primary rail reduces BOM count; D2PAK package supports automated optical inspection and reliable thermal performance in compact enclosures.

Industrial Power Supply

Automotive Battery Charger

Use Scenario: On-board 5 V/3.3 V logic supply in PLC modules powered from 24 V DC bus.

IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V nominal input to stable 5 V output for microcontroller, I/O drivers, and communication interfaces.

Use Value: Delivers full 3.0 A at >77% efficiency (Vin = 12 V), reducing thermal load versus linear regulators and eliminating need for large heatsinks.

Use Scenario: Constant-current/constant-voltage stage in 12 V lead-acid battery charger with microcontroller supervision.

IC Role / Device Role / Timing Role: Adjustable buck controller set to 13.8 V float voltage, dynamically reconfigured via DAC-controlled feedback resistors.

Use Value: ±4% output accuracy ensures precise battery voltage regulation; ON/OFF pin enables charge termination and sleep mode coordination.

Embedded System Pre-regulator

POS Terminal Power Management

Use Scenario: Intermediate 5 V rail feeding low-dropout linear regulators for noise-sensitive analog sensors and ADCs.

IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 12 V or 24 V system input before final LDO conditioning.

Use Value: Reduces power dissipation in downstream LDOs by lowering input-to-output differential; 52 kHz switching avoids audible noise in consumer-facing devices.

Use Scenario: Multi-rail power solution in retail point-of-sale terminals requiring 12 V for printer, 5 V for display, and 3.3 V for processor.

IC Role / Device Role / Timing Role: Configurable buck regulator generating 12 V output (via R1/R2), with secondary converters derived from same input bus.

Use Value: Single-component solution for primary rail reduces BOM count; D2PAK package supports automated optical inspection and reliable thermal performance in compact enclosures.

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	Higher 63 kHz switching frequency; lower 1.23 V reference tolerance (±1.5%); 3.0 A rated but derated above 85 °C ambient.	Better ripple suppression due to higher frequency; less suitable for high-temperature industrial enclosures without forced air.	Prefer LM2576D2T-ADJR4 when operating above 85 °C or where proven long-term reliability in legacy designs is required.
MP1584EN-LF-Z	4.5–28 V input range; 3 A output; 1.22 V reference; requires external compensation; smaller SO-8EP package.	Not pin-compatible; needs additional loop compensation components; limited to lower input voltages.	Select MP1584EN-LF-Z only if space-constrained layout and <28 V input allow; otherwise LM2576D2T-ADJR4 offers broader input range and simpler design.

Compared with LM2596S-ADJ and MP1584EN-LF-Z, the LM2576D2T-ADJR4 provides superior thermal robustness (150 °C max T_J, R_JC = 5.0 °C/W), wider 7–40 V input support, and mature qualification history-making it preferred for industrial and automotive-adjacent applications demanding field-proven reliability.

Availability

LM2576D2T-ADJR4 is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, and embedded pre-regulators requiring stable component supply, long-lifecycle support, and consistent thermal performance across temperature extremes.

Supply support for LM2576D2T-ADJR4 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The LM2576 series was designed as a rugged, easy-to-use monolithic buck regulator targeting cost-sensitive, high-reliability power conversion in industrial controls, telecom infrastructure, and legacy embedded systems where simplicity and thermal resilience are critical.

FAQ

What is the maximum input voltage rating for LM2576D2T-ADJR4?

The LM2576D2T-ADJR4 has a maximum supply voltage rating of 45 V, with recommended operating input range of 7.0 V to 40 V per datasheet specifications. Exceeding 45 V may cause permanent damage. For reliable operation at 40 V input, ensure sufficient derating margin and verify thermal performance under worst-case load conditions for the LM2576D2T-ADJR4.

How do I calculate output voltage for LM2576D2T-ADJR4?

The LM2576D2T-ADJR4 output voltage is set by external resistors R1 and R2 using V_OUT = 1.23 V × (1 + R2/R1). R1 should be between 1.0 kΩ and 5.0 kΩ; 1% metal film resistors are recommended for stability. For example, R1 = 1.2 kΩ and R2 = 4.98 kΩ yields 6.24 V output. This formula applies directly to the LM2576D2T-ADJR4 because its feedback pin connects to the error amplifier input without internal division.

Does LM2576D2T-ADJR4 require a heatsink?

The LM2576D2T-ADJR4 can operate without a heatsink at moderate loads and ambient temperatures, but thermal design must account for power dissipation: P_D ≈ (V_IN − V_OUT) × I_OUT × (1 − η). With R_JC = 5.0 °C/W and R_JA = 70 °C/W (D2PAK), a heatsink is strongly recommended for continuous 3.0 A operation above 25 °C ambient - especially at high input-output differentials. The exposed tab of the LM2576D2T-ADJR4 must be thermally connected to the heatsink.

What diode is recommended for use with LM2576D2T-ADJR4?

onsemi recommends Schottky diodes such as MBR360 (40 V, 3.0 A) or MBR340 (40 V, 3.0 A) for the LM2576D2T-ADJR4 catch diode. These provide low forward voltage (~0.5 V), fast recovery, and adequate surge current rating. Diode reverse voltage must exceed 1.25 × V_IN(MAX); for 40 V max input, ≥50 V rating is advised. The LM2576D2T-ADJR4 datasheet explicitly lists MBR360 in Figure 15 and Table 1.

Is LM2576D2T-ADJR4 RoHS and REACH compliant?

Yes, the LM2576D2T-ADJR4 is Pb-Free and RoHS-compliant per onsemi's packaging documentation. It meets EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 requirements. The "R4" suffix in LM2576D2T-ADJR4 denotes RoHS-compliant packaging. Full compliance documentation, including substance declarations, is available in onsemi's official product change notices and material content reports for the LM2576D2T-ADJR4.

LM2576D2T-ADJR4 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: D2PAK-5

LM2576D2T-ADJR4 FAQ

1.How can I place an order for LM2576D2T-ADJR4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2576D2T-ADJR4 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-ADJR4 reliable?

The price and inventory of LM2576D2T-ADJR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-ADJR4 is usually 5 days.

3.What payment methods are accepted for LM2576D2T-ADJR4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-ADJR4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2576D2T-ADJR4?

LM2576D2T-ADJR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2576D2T-ADJR4 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-ADJR4?

For technical support, including LM2576D2T-ADJR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-ADJR4 requirements.

6.How does Aetrix verify that LM2576D2T-ADJR4 is sourced from the original manufacturer or authorized distributors?

All LM2576D2T-ADJR4 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-ADJR4 meets industry standards.

7.What is the process for return or replacement of LM2576D2T-ADJR4?

All LM2576D2T-ADJR4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-ADJR4, 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-ADJR4 part is unused and in its original packaging.

Return procedure for LM2576D2T-ADJR4:

1.Submit a request within 90 days.

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

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