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

onsemi LM2575D2T-12R4

Name: LM2575D2T-12R4
Brand: onsemi
SKU: LM2575D2T-12R4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2575D2T-12R4

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: LM2575D2T-12R4.pdf

Description:: IC REG BUCK 12V 1A D2PAK-5

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Product details

Overview

LM2575D2T-12R4 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 12 V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and wide 4.75 V to 40 V input range. It integrates a 1.0 A switch, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in industrial power supplies, battery chargers, and on-card DC-DC conversion.

For engineers reviewing the LM2575D2T-12R4 datasheet, pinout, applications, or equivalent options, key selection considerations include guaranteed 1.0 A load capability at 12 V, no external compensation required, D2PAK (TO-263) package thermal performance (R_JC = 5.0 °C/W), and compatibility with standard off-the-shelf inductors (e.g., 330 µH).

Technical Context

The LM2575D2T-12R4 implements a voltage-mode controlled buck converter with a fixed 52 kHz oscillator, internal 1.235 V bandgap reference, and error amplifier driving a 1.0 A NPN switch. Regulation is achieved by comparing feedback voltage (internally derived from 12 V output) against the reference and adjusting duty cycle via PWM comparator.

It features built-in protection: cycle-by-cycle current limiting (typ. 2.3 A peak), thermal shutdown (T_J > 150 °C), and low-quiescent standby mode (80 µA typ.) enabled via TTL-level ON/OFF pin. The device operates across −40 °C to +125 °C junction temperature and requires only four external components: input capacitor, output capacitor, catch diode (e.g., 1N5819), and inductor.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 12 V ±4% over full line (4.75–40 V), load (0.2–1.0 A), and temperature (−40 to +125 °C) - ensures stable rail for downstream logic or analog circuitry without trimming.
Max Output Current	1.0 A continuous - supports moderate-power loads such as microcontrollers, sensors, or interface ICs without external current boosting.
Input Voltage Range	4.75 V to 40 V - accommodates 12 V/24 V industrial buses, automotive battery variations (cold crank to load dump), and unregulated wall adapters.
Switching Frequency	52 kHz (±10% over 0–125 °C) - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) and reduces EMI compared to higher-frequency alternatives.
Efficiency	88% typical at V_IN = 15 V, I_OUT = 1.0 A - minimizes power loss and heat generation, often eliminating need for heatsink in ambient ≤50 °C.
Quiescent Current	5.0 mA typical (11 mA max) in active mode; 80 µA typical in shutdown - enables low-power standby operation in battery-backed systems.
Thermal Resistance	R_JC = 5.0 °C/W - allows direct heatsinking via PCB copper pour or external heatsink attached to exposed tab (Pin 3), critical for sustained 1.0 A operation.

Pinout & Package

D2PAK (TO-263-5) package with exposed metal tab thermally and electrically connected to Pin 3 (GND). Heatsink surface must be soldered to large copper area for thermal management. Moisture Sensitivity Level (MSL) = 1 - no bake required before reflow.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vin	Positive input supply	Accepts 4.75–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF/50 V) placed adjacent to minimize switching noise and voltage transients.
2 - Output	Emitter of internal NPN switch	Delivers regulated 12 V; saturation voltage ≤1.2 V at 1.0 A - contributes to dropout and efficiency; PCB copper area must be minimized to reduce EMI coupling.
3 - GND	Circuit ground reference	Common return for input/output capacitors, catch diode, and feedback network; also connects to heatsink tab - single-point grounding recommended.
4 - Feedback	Internal voltage divider tap	Internally connected to fixed 12 V divider; not user-accessible - eliminates external resistor network required in adjustable versions.
5 - ON/OFF	TTL-compatible enable/disable control	Logic-high (>2.2 V) disables regulator (I_Q ≈ 80 µA); logic-low (<1.2 V) enables - supports system-level power sequencing and sleep modes.

Key Features

Feature	Design Value
Fixed 12 V output	Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across temperature and load.
Integrated 1.0 A switch	Reduces external component count and simplifies design - no external MOSFET or driver needed for ≤1.0 A applications.
Thermal shutdown + current limit	Provides autonomous fault protection during overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure without external circuitry.
52 kHz fixed-frequency operation	Enables predictable EMI filtering and compatibility with low-cost, high-current inductors optimized for this frequency (e.g., Renco RL1952, Pulse PE-52627).
TTL shutdown with 80 µA standby	Supports low-power system states - e.g., MCU-controlled sleep mode in portable or remote-sensor applications without auxiliary LDO.

Applications

Industrial Power Supply	Battery Charger Front-End
Use Scenario: Converting 24 V DC bus to stable 12 V for PLC I/O modules, motor drivers, or fieldbus interfaces in factory automation. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and robust 12 V rail with built-in fault protection. Use Value: Delivers full 1.0 A at 88% efficiency with no heatsink required below 50 °C ambient - reduces system size and thermal design complexity.	Use Scenario: Pre-regulating variable-input (15–30 V) battery charger output to fixed 12 V for charging lead-acid or LiFePO₄ battery banks. IC Role / Device Role / Timing Role: Constant-voltage stage ensuring precise 12 V delivery despite input ripple and load transients. Use Value: ±4% output tolerance and 52 kHz switching enable tight voltage control and predictable filter design - critical for battery longevity.
On-Card DC-DC Conversion	Linear Regulator Pre-Regulator
Use Scenario: Generating local 12 V from a higher intermediate rail (e.g., 28 V) on embedded computing boards with space-constrained layouts. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete switcher designs - integrated switch and control logic. Use Value: D2PAK package with exposed thermal tab allows direct PCB heatsinking - achieves 1.0 A output in <1 cm² footprint without external FET or controller.	Use Scenario: Reducing 24 V input to ~15 V before feeding a linear regulator (e.g., LM7812) to minimize its power dissipation and thermal stress. IC Role / Device Role / Timing Role: Efficient pre-regulator lowering dropout voltage seen by downstream linear regulator. Use Value: 88% efficiency at 1.0 A cuts pre-regulator losses by >70% vs. resistive dropper - extends linear regulator lifetime and enables smaller heatsinks.

Industrial Power Supply

Battery Charger Front-End

Use Scenario: Converting 24 V DC bus to stable 12 V for PLC I/O modules, motor drivers, or fieldbus interfaces in factory automation.

IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and robust 12 V rail with built-in fault protection.

Use Value: Delivers full 1.0 A at 88% efficiency with no heatsink required below 50 °C ambient - reduces system size and thermal design complexity.

Use Scenario: Pre-regulating variable-input (15–30 V) battery charger output to fixed 12 V for charging lead-acid or LiFePO₄ battery banks.

IC Role / Device Role / Timing Role: Constant-voltage stage ensuring precise 12 V delivery despite input ripple and load transients.

Use Value: ±4% output tolerance and 52 kHz switching enable tight voltage control and predictable filter design - critical for battery longevity.

On-Card DC-DC Conversion

Linear Regulator Pre-Regulator

Use Scenario: Generating local 12 V from a higher intermediate rail (e.g., 28 V) on embedded computing boards with space-constrained layouts.

IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete switcher designs - integrated switch and control logic.

Use Value: D2PAK package with exposed thermal tab allows direct PCB heatsinking - achieves 1.0 A output in <1 cm² footprint without external FET or controller.

Use Scenario: Reducing 24 V input to ~15 V before feeding a linear regulator (e.g., LM7812) to minimize its power dissipation and thermal stress.

IC Role / Device Role / Timing Role: Efficient pre-regulator lowering dropout voltage seen by downstream linear regulator.

Use Value: 88% efficiency at 1.0 A cuts pre-regulator losses by >70% vs. resistive dropper - extends linear regulator lifetime and enables smaller heatsinks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2575T-12	TO-220-5 package (Case 314D); R_JA = 65 °C/W vs. 70 °C/W for D2PAK; identical electrical specs.	Requires external heatsink for 1.0 A continuous operation; less suitable for high-density PCBs.	Select when mechanical mounting constraints favor TO-220 or legacy board compatibility is required.
LM2596-12	Higher 150 kHz switching frequency; 3.0 A output rating; requires different inductor (e.g., 47–100 µH); ±2% output tolerance.	Better transient response and smaller magnetics, but higher EMI and more complex layout due to faster edges.	Select when higher current, tighter regulation, or smaller inductor size is prioritized - verify EMI compliance and layout rigor.

Compared with LM2575T-12, the LM2575D2T-12R4 offers superior thermal resistance to case (R_JC = 5.0 °C/W) enabling higher power density; versus LM2596-12, it trades higher frequency for lower EMI and simpler magnetics design - ideal for cost-sensitive, noise-sensitive industrial applications.

Availability

LM2575D2T-12R4 is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LM2575D2T-12R4 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The LM2575 series was designed as a simple, robust, and cost-effective monolithic buck regulator family targeting applications where minimal external components, high reliability, and wide input range outweigh the need for ultra-high efficiency or ultra-small size.

FAQ

What is the maximum input voltage for the LM2575D2T-12R4?

The LM2575D2T-12R4 supports a maximum input voltage of 40 V under normal operating conditions, with absolute maximum rating of 45 V. Operation above 40 V risks exceeding safe operating area limits and may trigger thermal shutdown or cause permanent damage. For reliable 12 V output, input should remain within 4.75 V to 40 V per datasheet specifications.

Does the LM2575D2T-12R4 require an external feedback resistor network?

No, the LM2575D2T-12R4 does not require external feedback resistors. As a fixed-output version, its internal resistor divider is factory-trimmed to deliver 12 V ±4%. Pin 4 (Feedback) is internally connected and not accessible - unlike the adjustable LM2575-ADJ, which requires external R1/R2 to set V_OUT.

Can the LM2575D2T-12R4 operate without a heatsink?

Yes, the LM2575D2T-12R4 can operate without an external heatsink under light-to-moderate loads and ambient temperatures ≤50 °C, thanks to its 88% typical efficiency at 1.0 A and low R_JC = 5.0 °C/W. However, sustained 1.0 A operation at high ambient or poor PCB copper area requires thermal vias and ≥2 in² of 2-oz copper connected to Pin 3 (GND/tab) for reliable junction temperature control.

What type of catch diode is recommended for the LM2575D2T-12R4?

A Schottky diode rated for ≥3.0 A peak current and ≥30 V reverse voltage is recommended - such as the 1N5819 (3 A, 40 V) or MBR340 (3 A, 40 V). Schottky diodes minimize forward voltage drop (V_F ≈ 0.4–0.5 V), improving efficiency and reducing thermal stress on both diode and LM2575D2T-12R4 compared to standard PN rectifiers.

Is the LM2575D2T-12R4 pin-compatible with other LM2575 variants?

The LM2575D2T-12R4 shares identical pinout (Vin, Output, GND, Feedback, ON/OFF) and package outline (D2PAK-5) with other D2T-suffix LM2575 variants (e.g., LM2575D2T-5R4, LM2575D2T-ADJR4), enabling direct substitution in fixed-output designs. However, it is not pin-compatible with TO-220 (T-suffix) or TO-263-3 (no ON/OFF pin) variants due to differing pin count and function mapping.

LM2575D2T-12R4 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

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4.75V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 12V

Voltage - Output (Max):: -

Current - Output:: 1A

Frequency - Switching:: 52kHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK-5

LM2575D2T-12R4 FAQ

1.How can I place an order for LM2575D2T-12R4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2575D2T-12R4 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 LM2575D2T-12R4 reliable?

The price and inventory of LM2575D2T-12R4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-12R4 is usually 5 days.

3.What payment methods are accepted for LM2575D2T-12R4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-12R4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2575D2T-12R4?

LM2575D2T-12R4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2575D2T-12R4 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 LM2575D2T-12R4?

For technical support, including LM2575D2T-12R4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-12R4 requirements.

6.How does Aetrix verify that LM2575D2T-12R4 is sourced from the original manufacturer or authorized distributors?

All LM2575D2T-12R4 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 LM2575D2T-12R4 meets industry standards.

7.What is the process for return or replacement of LM2575D2T-12R4?

All LM2575D2T-12R4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-12R4, 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 LM2575D2T-12R4 part is unused and in its original packaging.

Return procedure for LM2575D2T-12R4:

1.Submit a request within 90 days.

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

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