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

Texas Instruments LM2575T-15/NOPB

Name: LM2575T-15/NOPB
Brand: Texas Instruments
SKU: LM2575T-15/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2575T-15/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-220-5

Datasheet:: LM2575T-15/NOPB.pdf

Description:: IC REG BUCK 15V 1A TO220-5

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Product details

Overview

LM2575T-15/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 15V output, 40V maximum input voltage, 52 kHz fixed-frequency oscillator, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.

For engineers reviewing the LM2575T-15/NOPB datasheet, LM2575T-15/NOPB pinout, LM2575T-15/NOPB application, or LM2575T-15/NOPB equivalent, key selection criteria include output voltage tolerance (±4%), TO-220 package thermal resistance (65°C/W), standby current (50 μA), and compatibility with standard off-the-shelf inductors.

Technical Context

The LM2575T-15/NOPB implements a fixed-frequency PWM buck topology with internal NPN switch, feedback comparator, and oscillator. Its control loop uses voltage-mode regulation referenced to a 1.23V internal bandgap, requiring no external compensation.

It operates across −40°C to +125°C junction temperature, supports TTL-compatible shutdown via Pin 5, and delivers regulated 15V output with line regulation of ±0.2% and load regulation of ±0.5% under specified conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 15V ±4% over full operating range - ensures stable rail for analog front-ends and microcontroller peripherals.
Max Input Voltage	40V - supports 24V industrial bus inputs with margin for transients.
Output Current	1A continuous - sufficient for powering FPGA I/O banks or sensor signal chains.
Oscillator Frequency	52 kHz ±10% - enables use of low-cost, high-saturation-current toroidal inductors.
Efficiency	88% at VIN=18V, IOUT=1A - reduces thermal load vs. linear regulators in enclosed enclosures.
Standby Current	50 μA typical - enables low-power sleep modes in battery-backed systems.
Thermal Resistance	65°C/W (Junction-to-Ambient, TO-220, no heatsink) - defines minimum copper area required for thermal compliance.

Pinout & Package

LM2575T-15/NOPB is housed in a 5-lead TO-220 package (Package Number NDH0005D) with exposed tab electrically connected to Pin 2 (Output). The tab serves as primary heat path and must be thermally coupled to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1 (Input)	Power input	Accepts 4.75–40V DC; requires local 100 μF/75V electrolytic bypass capacitor.
2 (Output)	Regulated output & power ground reference	Delivers 15V/1A; connects to exposed tab for thermal conduction; ties to output capacitor negative.
3 (Ground)	Circuit ground	Separate low-noise ground return for feedback network; must be star-connected near IC.
4 (Feedback)	Voltage sense input	Internally referenced to 1.23V; unused in fixed-output versions - left open.
5 (ON/OFF)	TTL shutdown control	Drives output OFF when pulled ≥2.2V; draws ≤30 μA in shutdown - enables system-level power sequencing.

Key Features

Feature	Design Value
Integrated thermal shutdown	Activates at 150°C junction temperature and auto-recovers - eliminates need for external thermal cutoff.
Cycle-by-cycle current limiting	Peak switch current limited to 1.7–3.2A - protects against short-circuit faults without latch-up.
Fixed-frequency oscillator	52 kHz operation - simplifies EMI filtering design and avoids audio-band noise.
Requires only 4 external components	Inductor, catch diode, input cap, output cap - reduces BOM count and layout complexity.
TTL-compatible shutdown	50 μA standby current with logic-level control - enables microcontroller-driven power management.

Applications

Industrial Power Supply	Microcontroller Power Rail
Use Scenario: 24V DC field bus powering programmable logic controllers with isolated I/O modules. IC Role / Device Role / Timing Role: Primary 15V step-down regulator delivering clean, efficient power to analog signal conditioning circuits. Use Value: 88% efficiency at 1A reduces heat sink size by >70% versus 78M15 linear regulator, enabling compact DIN-rail enclosure designs.	Use Scenario: Embedded control board for HVAC actuators using ARM Cortex-M4 MCU with 15V analog peripherals. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying stable 15V rail for op-amps and ADC reference buffers. Use Value: ±4% output tolerance and <0.5% load regulation ensure consistent sensor measurement accuracy across 0–1A load variation.
On-Card Switching Regulator	Positive-to-Negative Converter
Use Scenario: PCB-mounted auxiliary supply on motor drive board generating 15V for gate drivers and isolation bias. IC Role / Device Role / Timing Role: Compact, self-contained buck stage replacing discrete transistor-based regulators. Use Value: TO-220 package with 65°C/W θJA allows direct mounting to 4-in² copper pour - eliminates separate heatsink and mounting hardware.	Use Scenario: Bipolar supply generation for op-amp circuits requiring ±15V rails from single 24V input. IC Role / Device Role / Timing Role: Buck-boost configured as inverting regulator (using LM2575T-15/NOPB in standard topology with inverted output). Use Value: 52 kHz fixed frequency enables predictable filter design for clean −15V output with <100 mVpp ripple using standard 330 μH inductor.

Industrial Power Supply

Microcontroller Power Rail

Use Scenario: 24V DC field bus powering programmable logic controllers with isolated I/O modules.

IC Role / Device Role / Timing Role: Primary 15V step-down regulator delivering clean, efficient power to analog signal conditioning circuits.

Use Value: 88% efficiency at 1A reduces heat sink size by >70% versus 78M15 linear regulator, enabling compact DIN-rail enclosure designs.

Use Scenario: Embedded control board for HVAC actuators using ARM Cortex-M4 MCU with 15V analog peripherals.

IC Role / Device Role / Timing Role: Fixed-output buck converter supplying stable 15V rail for op-amps and ADC reference buffers.

Use Value: ±4% output tolerance and <0.5% load regulation ensure consistent sensor measurement accuracy across 0–1A load variation.

On-Card Switching Regulator

Positive-to-Negative Converter

Use Scenario: PCB-mounted auxiliary supply on motor drive board generating 15V for gate drivers and isolation bias.

IC Role / Device Role / Timing Role: Compact, self-contained buck stage replacing discrete transistor-based regulators.

Use Value: TO-220 package with 65°C/W θJA allows direct mounting to 4-in² copper pour - eliminates separate heatsink and mounting hardware.

Use Scenario: Bipolar supply generation for op-amp circuits requiring ±15V rails from single 24V input.

IC Role / Device Role / Timing Role: Buck-boost configured as inverting regulator (using LM2575T-15/NOPB in standard topology with inverted output).

Use Value: 52 kHz fixed frequency enables predictable filter design for clean −15V output with <100 mVpp ripple using standard 330 μH inductor.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2575HVT-15/NOPB	60V max input (vs. 40V), same 15V output, identical pinout and package	Suitable for 48V telecom or automotive cold-crank environments where input may exceed 40V	Select when input transient immunity beyond 40V is required; otherwise LM2575T-15/NOPB offers cost advantage.
LM2596T-15	Higher 3A output current, 150 kHz switching frequency, different pinout (TO-220-5 vs. TO-220-5 but non-interchangeable)	Supports higher load currents and smaller passive components; not drop-in compatible due to different feedback and shutdown behavior	Choose for >1A loads or space-constrained designs needing smaller inductors; requires full schematic and layout revision.

Compared with LM2575HVT-15/NOPB, the LM2575T-15/NOPB trades input voltage headroom for lower cost and established qualification in industrial controls; versus LM2596T-15, it provides proven reliability at 1A with simpler EMI filtering but lacks scalability for higher current demands.

Availability

LM2575T-15/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM2575T-15/NOPB 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 leader specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability power conversion ICs.

The LM2575 series was designed as a robust, easy-to-use replacement for linear regulators in cost-sensitive industrial and consumer power applications - emphasizing simplicity, thermal resilience, and minimal external component count.

FAQ

What is the maximum input voltage rating for LM2575T-15/NOPB?

The LM2575T-15/NOPB has an absolute maximum input voltage of 45V, but its specified operating range is 4.75V to 40V. Operation above 40V risks exceeding electrical specifications and is not guaranteed; for 48V systems, TI recommends the LM2575HVT-15/NOPB variant rated up to 60V input.

Does LM2575T-15/NOPB require external compensation components?

No, the LM2575T-15/NOPB integrates full frequency compensation and requires no external compensation network. Its voltage-mode control architecture with fixed 52 kHz oscillator and internal error amplifier eliminates the need for external capacitors or resistors in the feedback loop - a key simplification versus adjustable switching controllers.

Can LM2575T-15/NOPB be used in a buck-boost configuration to generate negative output?

Yes, the LM2575T-15/NOPB can be configured as a buck-boost inverter to generate −15V from a positive input, using the standard application circuit shown in TI's SNVS106E datasheet Figure 32. This requires reversing input/output capacitor polarity and using a grounded inductor - the IC itself does not change, but layout and component ratings must follow inverting topology guidelines.

What is the thermal resistance (θ_JA) of LM2575T-15/NOPB in its TO-220 package?

The LM2575T-15/NOPB in the 5-lead TO-220 package (NDH0005D) has a junction-to-ambient thermal resistance of 65°C/W when mounted vertically on a PCB with minimal copper area, and 45°C/W with ~4 in² of copper surrounding the leads. These values assume no external heatsink and define minimum PCB copper requirements for safe 1A operation at maximum ambient temperature.

Is the feedback pin (Pin 4) used in LM2575T-15/NOPB?

No, the feedback pin (Pin 4) is not connected internally in the fixed-output LM2575T-15/NOPB variant and must be left unconnected (open). It is only functional in the adjustable version (LM2575T-ADJ); connecting it in the 15V fixed version may cause regulation instability or damage due to unintended bias paths.

LM2575T-15/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: SIMPLE SWITCHER®

Package/Case:: TO-220-5

Packaging:: Tube

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 4V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 15V

Voltage - Output (Max):: -

Current - Output:: 1A

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

LM2575T-15/NOPB FAQ

1.How can I place an order for LM2575T-15/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2575T-15/NOPB 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 LM2575T-15/NOPB reliable?

The price and inventory of LM2575T-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-15/NOPB is usually 5 days.

3.What payment methods are accepted for LM2575T-15/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-15/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2575T-15/NOPB?

LM2575T-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2575T-15/NOPB 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 LM2575T-15/NOPB?

For technical support, including LM2575T-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-15/NOPB requirements.

6.How does Aetrix verify that LM2575T-15/NOPB is sourced from the original manufacturer or authorized distributors?

All LM2575T-15/NOPB 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 LM2575T-15/NOPB meets industry standards.

7.What is the process for return or replacement of LM2575T-15/NOPB?

All LM2575T-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-15/NOPB, 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 LM2575T-15/NOPB part is unused and in its original packaging.

Return procedure for LM2575T-15/NOPB:

1.Submit a request within 90 days.

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

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