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

Microchip Technology LM2575-5.0YN

Name: LM2575-5.0YN
Brand: Microchip Technology
SKU: LM2575-5.0YN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2575-5.0YN

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: LM2575-5.0YN.pdf

Description:: IC REG BUCK 5V 1A 16DIP

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Product details

Overview

LM2575-5.0YN from Micrel is a fixed-output 5.0V, 1A step-down (buck) switching regulator in a 5-pin TO-220 package, operating at 52kHz with ±3% output voltage tolerance, 4V–40V input range, and integrated thermal shutdown and cycle-by-cycle current limiting - used in on-card DC/DC conversion for industrial power supplies.

For engineers reviewing the LM2575-5.0YN datasheet, LM2575-5.0YN pinout, LM2575-5.0YN application, or LM2575-5.0YN equivalent, key selection criteria include guaranteed 1A output current, fixed 5V output without external feedback resistors, TO-220 thermal performance (θ_JA = 65°C/W), and compatibility with standard 330µH inductors and Schottky catch diodes.

Technical Context

The LM2575-5.0YN integrates a 52kHz oscillator, fixed-gain error amplifier, 1.23V bandgap reference, and 1A NPN switch driver in a monolithic buck topology. Its internal compensation eliminates need for external loop components, and ON/OFF control enables <200µA standby current via logic-level pin 5.

It uses voltage-mode PWM control with cycle-by-cycle current limiting and thermal shutdown. The fixed 5.0V output is internally trimmed - no external feedback network required - and regulation is maintained across 0.2A–1A load and 8V–40V input per spec limits.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0V ±3% over full temperature and load range - eliminates feedback resistor design and layout sensitivity.
Max Output Current	1A continuous - supports mid-power embedded rails without external current boosting.
Input Voltage Range	4V to 40V - accommodates wide-input industrial, automotive, and telecom supply buses.
Switching Frequency	52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) with minimal EMI filtering.
Efficiency	82% typical at 12V_IN/5V_OUT/1A - reduces thermal load vs. linear regulators, often eliminating heatsinks.
Standby Current	<200µA when ON/OFF pin = 5V - enables low-power sleep modes in battery-backed systems.
Protection Features	Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or ambient overheating.

Pinout & Package

Package: 5-pin TO-220 (vertical mount, tab connected to GND). Thermal resistance θ_JA = 65°C/W (no heatsink), θ_JC = 2°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1: VIN	Unregulated input supply	Accepts 4V–40V DC; requires ≥100µF bulk capacitor close to pin for stability.
2: OUTPUT	Switched output node	Drives external inductor; connects to cathode of Schottky catch diode (e.g., MBR360).
3: GND	Power ground reference	Common return for input cap, output cap, and feedback network; single-point grounding critical.
4: FEEDBACK	Internal 5.0V reference monitor	Internally tied to 5.0V output - not externally accessible; unused in fixed-version operation.
5: ON/OFF	Logic-controlled enable	Active-high: ≥2.2V = ON; ≤1.0V = OFF; draws ≤30µA in active state, ≤200µA in shutdown.

Key Features

Feature	Design Value
Fixed 5.0V output	Eliminates external feedback resistors and associated layout errors or drift - simplifies BOM and validation.
Integrated current limiting	Peak current limit of 2.2A (min 1.7A) protects against short-circuit faults without external sensing components.
Thermal shutdown	Activates at ~150°C junction temperature and auto-recovers after cooldown - prevents permanent silicon damage.
Low external part count	Requires only 4 components: input cap, output cap, inductor, and Schottky diode - accelerates prototyping and reduces board area.
52kHz fixed-frequency operation	Enables predictable EMI filtering and compatibility with off-the-shelf 330µH inductors rated for ≥1.5A saturation current.

Applications

Industrial Power Rails	Embedded Control Boards
Use Scenario: Converting 24V factory bus to stable 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator supplying logic power to microcontrollers and digital isolators. Use Value: Delivers 1A at 82% efficiency with no heatsink needed, reducing system size and thermal management complexity.	Use Scenario: On-board DC/DC conversion for FPGA or ARM-based edge controllers with tight space constraints. IC Role / Device Role / Timing Role: Fixed-output step-down regulator powering core logic and peripherals from unregulated 12V or 24V inputs. Use Value: Eliminates external feedback network, improving long-term output accuracy and reducing component count by two resistors.
Telecom Line Cards	Test Equipment Power Supplies
Use Scenario: Generating 5V rail from -48V backplane via isolated flyback stage followed by local regulation. IC Role / Device Role / Timing Role: Post-regulator ensuring tight 5V tolerance despite upstream converter ripple and load transients. Use Value: ±3% output tolerance and fast load transient response (<100µs recovery) maintain digital IC timing margins.	Use Scenario: Bench-top instrument power subsystem requiring reliable, low-noise 5V for analog front-ends and DACs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-dropout linear regulators to achieve ultra-low noise. Use Value: Reduces heat dissipation vs. linear solution, enabling compact chassis design without forced-air cooling.

Industrial Power Rails

Embedded Control Boards

Use Scenario: Converting 24V factory bus to stable 5V for PLC I/O modules and sensor interfaces.

IC Role / Device Role / Timing Role: Primary buck regulator supplying logic power to microcontrollers and digital isolators.

Use Value: Delivers 1A at 82% efficiency with no heatsink needed, reducing system size and thermal management complexity.

Use Scenario: On-board DC/DC conversion for FPGA or ARM-based edge controllers with tight space constraints.

IC Role / Device Role / Timing Role: Fixed-output step-down regulator powering core logic and peripherals from unregulated 12V or 24V inputs.

Use Value: Eliminates external feedback network, improving long-term output accuracy and reducing component count by two resistors.

Telecom Line Cards

Test Equipment Power Supplies

Use Scenario: Generating 5V rail from -48V backplane via isolated flyback stage followed by local regulation.

IC Role / Device Role / Timing Role: Post-regulator ensuring tight 5V tolerance despite upstream converter ripple and load transients.

Use Value: ±3% output tolerance and fast load transient response (<100µs recovery) maintain digital IC timing margins.

Use Scenario: Bench-top instrument power subsystem requiring reliable, low-noise 5V for analog front-ends and DACs.

IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-dropout linear regulators to achieve ultra-low noise.

Use Value: Reduces heat dissipation vs. linear solution, enabling compact chassis design without forced-air cooling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2575-5.0WT	Same electrical specs; RoHS-compliant "W" grade with high-melting solder exemption; identical TO-220 package.	No functional difference - intended for same industrial and telecom applications requiring lead-free compliance.	Select LM2575-5.0WT if RoHS-6 compliance with exemption is mandated; otherwise LM2575-5.0YN is functionally identical.
LM2596-5.0	Higher 3A rating, 150kHz switching frequency, tighter ±2% output tolerance, but requires external feedback resistors even in fixed versions.	Better suited for higher-current or space-constrained designs where smaller inductors are preferred, but adds resistor layout complexity.	Choose LM2596-5.0 only if >1A output or higher efficiency at light loads is required; LM2575-5.0YN offers simpler implementation for 1A fixed-voltage needs.

Compared with LM2575-5.0WT, the LM2575-5.0YN shares identical electrical behavior and thermal performance but lacks RoHS-6 certification; versus LM2596-5.0, it trades higher current capability and frequency for lower external part count and proven robustness in legacy industrial designs.

Availability

LM2575-5.0YN is available at Aetrix Electronics and suitable for industrial power rails, embedded control boards, and telecom line cards requiring stable component supply, long-lifecycle support, and TO-220 mechanical compatibility.

Supply support for LM2575-5.0YN 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

Micrel Inc. was a U.S.-based semiconductor company specializing in power management, analog, and mixed-signal ICs before its acquisition by Microchip Technology in 2015.

The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial and telecom power supplies - emphasizing simplicity, thermal resilience, and minimal external component count.

FAQ

What is the maximum input voltage rating for the LM2575-5.0YN?

The LM2575-5.0YN has an absolute maximum input voltage of 45V, with recommended operating range up to 40V. Exceeding 45V risks permanent damage to the internal switch and protection circuitry. For reliable operation across temperature extremes, keep VIN ≤ 40V and ensure input transient suppression per Micrel's layout guidelines.

Does the LM2575-5.0YN require external feedback resistors to set the output voltage?

No - the LM2575-5.0YN is a fixed-output variant with internal 5.0V regulation. Unlike adjustable versions (e.g., LM2575), it does not use pins 4 (FB) for external resistor networks. Pin 4 is internally connected to the regulated output, so no external components are needed to configure the 5.0V rail.

Can the LM2575-5.0YN be used in a negative-output (inverting) configuration?

Yes - the LM2575-5.0YN supports inverting buck-boost topology to generate negative voltages. In this mode, the device regulates the magnitude of the negative output (e.g., –5V) using the same internal 5.0V reference. Layout must follow Micrel's Figure 1B guidance, including proper grounding and catch diode orientation.

What thermal performance can be expected from the LM2575-5.0YN in a TO-220 package without a heatsink?

With no heatsink and standard PCB mounting (1/2" leads in socket or minimal copper), the LM2575-5.0YN has θ_JA = 65°C/W. At 1A output and 12V input, power dissipation is ~1.4W, resulting in ~91°C rise above ambient - acceptable up to +35°C ambient. For higher ambient or sustained 1A loads, a small heatsink or increased copper area is recommended.

Is the LM2575-5.0YN pin-compatible with other members of the LM2575 family in the same package?

Yes - all LM2575 variants (e.g., LM2575-3.3YN, LM2575-12YN, LM2575-5.0BT) share identical 5-pin TO-220 pinout: VIN (1), OUTPUT (2), GND (3), FB (4), ON/OFF (5). This allows direct substitution between fixed-output versions without PCB changes, provided input/output capacitors and inductor ratings match the new voltage/current requirements.

LM2575-5.0YN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 16-DIP (0.300", 7.62mm)

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):: 5V

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:: 16-DIP

LM2575-5.0YN FAQ

1.How can I place an order for LM2575-5.0YN through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2575-5.0YN 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 LM2575-5.0YN reliable?

The price and inventory of LM2575-5.0YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-5.0YN is usually 5 days.

3.What payment methods are accepted for LM2575-5.0YN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-5.0YN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM2575-5.0YN?

LM2575-5.0YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2575-5.0YN 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 LM2575-5.0YN?

For technical support, including LM2575-5.0YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-5.0YN requirements.

6.How does Aetrix verify that LM2575-5.0YN is sourced from the original manufacturer or authorized distributors?

All LM2575-5.0YN 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 LM2575-5.0YN meets industry standards.

7.What is the process for return or replacement of LM2575-5.0YN?

All LM2575-5.0YN units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-5.0YN, 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 LM2575-5.0YN part is unused and in its original packaging.

Return procedure for LM2575-5.0YN:

1.Submit a request within 90 days.

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

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