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

Microchip Technology LM2575-5.0WU

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

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Part No.:: LM2575-5.0WU

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - DC DC Switching Regulators

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

Datasheet:: LM2575-5.0WU.pdf

Description:: IC REG BUCK 5V 1A TO263-5

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Product details

Overview

LM2575-5.0WU from Micrel is a fixed-output 5V, 1A monolithic buck switching regulator in TO-263 package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance over line/load/temperature, internal current limiting, thermal shutdown, and ON/OFF control. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.

For engineers reviewing the LM2575-5.0WU datasheet, LM2575-5.0WU pinout, LM2575-5.0WU application, or LM2575-5.0WU equivalent, key selection criteria include input voltage range (4–40V), guaranteed 1A output, 82% typical efficiency at 12V_IN/5V_OUT/1A, thermal resistance θ_JA = 45°C/W (with 4 in² copper), and TO-263 package compatibility with surface-mount thermal management.

Technical Context

The LM2575-5.0WU integrates a 52kHz oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch driver in a single TO-263 package. Its feedback loop is internally compensated, eliminating need for external compensation networks.

It operates in continuous conduction mode with cycle-by-cycle current limiting (1.7–3.2A peak) and thermal shutdown activation at T_J ≥ 150°C. The ON/OFF pin accepts TTL-compatible logic levels (V_IL ≤ 1.0V, V_IH ≥ 2.2V) and reduces quiescent current to ≤200µA in standby.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 5.0V ±3% over 0.2–1A load and 8–40V input, enabling stable rail generation without external resistors.
Max Output Current	Guaranteed 1A DC output with internal current limit protection, supporting medium-power embedded systems.
Input Voltage Range	4V to 40V DC, allowing direct use with 12V/24V industrial buses and unregulated AC-DC outputs.
Switching Frequency	52kHz ±10%, enabling use of low-cost, standard 330µH inductors and reducing EMI filtering complexity.
Efficiency	82% typical at 12V_IN, 5V_OUT, 1A load-reducing heat dissipation vs. linear regulators and eliminating heatsinks in many cases.
Thermal Resistance	θ_JA = 45°C/W with ~4 in² PCB copper, enabling reliable operation up to +125°C junction temperature.
Standby Current	≤200µA when ON/OFF pin is high, supporting low-power sleep modes in battery-backed or energy-conscious designs.

Pinout & Package

LM2575-5.0WU uses a 5-pin TO-263 (surface-mount) package with exposed thermal pad. Pin 1 is VIN, Pin 2 is OUTPUT, Pin 3 is GND, Pin 4 is FEEDBACK (internally connected to 5V regulation node), and Pin 5 is ON/OFF. The tab is electrically connected to Pin 3 (GND).

Pin/Terminal	Circuit Role	Design Meaning
1 - VIN	Unregulated input supply connection	Accepts 4–40V DC; requires local 100µF input capacitor to suppress ripple and support peak current demands.
2 - OUTPUT	Switched output node driving external inductor	Connects to catch diode anode and inductor; carries pulsed 1A current-requires short, low-inductance PCB trace.
3 - GND	Power and signal ground reference	Common return for internal circuitry, thermal pad, and external capacitors; must be tied to large copper area for thermal performance.
4 - FB	Feedback input (internal connection)	Internally tied to 5V output; not externally accessible-no resistor divider required for fixed 5V operation.
5 - ON/OFF	Logic-controlled enable/disable input	Drives internal regulator into <200µA standby when pulled ≥2.2V; pulls low (<1.0V) to activate switching operation.

Key Features

Feature	Design Value
Fixed 5V output	Eliminates external feedback resistors-reduces BOM count, layout area, and calibration risk in cost-sensitive applications.
52kHz fixed-frequency oscillator	Enables predictable EMI spectrum and simplifies filter design using off-the-shelf 330µH inductors and standard electrolytic capacitors.
Internal current limiting & thermal shutdown	Provides autonomous fault protection without external sensing-ensures robustness during overload, short-circuit, or ambient overheating.
ON/OFF logic control	Supports system-level power sequencing and low-power states via simple microcontroller GPIO, reducing system standby consumption.
TO-263 thermal package	Delivers 45°C/W junction-to-ambient thermal resistance with standard PCB copper-enabling compact, heatsink-free 1A designs.

Applications

Industrial Power Supply	Embedded Controller Board
Use Scenario: Converting 24V DC bus to regulated 5V for PLC I/O modules operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean 5V to microcontrollers, sensors, and digital logic. Use Value: Delivers 1A at 82% efficiency with no heatsink needed, reducing board size and improving reliability over linear alternatives.	Use Scenario: On-board power conversion for ARM-based edge computing modules powered from 12V wall adapters or PoE injectors. IC Role / Device Role / Timing Role: Main 5V rail generator with ON/OFF control synchronized to host processor sleep/wake cycles. Use Value: Standby current <200µA extends battery backup runtime; TO-263 package supports automated SMT assembly and thermal performance.
Automotive Body Control Unit	Test & Measurement Equipment
Use Scenario: Regulating 12V vehicle battery (9–16V nominal, up to 40V load dump) to stable 5V for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Input-stage buck converter preceding LDOs, handling wide input transients and load variations. Use Value: 40V absolute max input rating and thermal shutdown protect against automotive load-dump events without external clamping.	Use Scenario: Providing isolated 5V bias for analog front-end circuits in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-noise LDOs, minimizing heat-induced drift in precision measurement paths. Use Value: Fixed 5V output eliminates resistor tolerance errors; ±3% regulation ensures consistent ADC reference stability across operating conditions.

Industrial Power Supply

Embedded Controller Board

Use Scenario: Converting 24V DC bus to regulated 5V for PLC I/O modules operating in factory environments with wide ambient temperature swings.

IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean 5V to microcontrollers, sensors, and digital logic.

Use Value: Delivers 1A at 82% efficiency with no heatsink needed, reducing board size and improving reliability over linear alternatives.

Use Scenario: On-board power conversion for ARM-based edge computing modules powered from 12V wall adapters or PoE injectors.

IC Role / Device Role / Timing Role: Main 5V rail generator with ON/OFF control synchronized to host processor sleep/wake cycles.

Use Value: Standby current <200µA extends battery backup runtime; TO-263 package supports automated SMT assembly and thermal performance.

Automotive Body Control Unit

Test & Measurement Equipment

Use Scenario: Regulating 12V vehicle battery (9–16V nominal, up to 40V load dump) to stable 5V for MCU and CAN transceivers.

IC Role / Device Role / Timing Role: Input-stage buck converter preceding LDOs, handling wide input transients and load variations.

Use Value: 40V absolute max input rating and thermal shutdown protect against automotive load-dump events without external clamping.

Use Scenario: Providing isolated 5V bias for analog front-end circuits in portable multimeters and data loggers.

IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-noise LDOs, minimizing heat-induced drift in precision measurement paths.

Use Value: Fixed 5V output eliminates resistor tolerance errors; ±3% regulation ensures consistent ADC reference stability across operating conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2575-5.0T	Same electrical specs but in through-hole TO-220 package (θ_JA = 65°C/W); no exposed thermal pad.	Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred.	Select LM2575-5.0T only if TO-220 mechanical fit or hand-solderability is required; LM2575-5.0WU offers superior thermal performance in production SMT.
MP1584EN-LF-Z	40V input, 3A output, 1.5MHz switching frequency; requires external feedback resistors and compensation.	Better suited for space-constrained designs needing higher current or smaller magnetics, but increases design complexity.	Choose MP1584EN-LF-Z only when >1A output or >500kHz operation is mandatory; LM2575-5.0WU provides simpler, proven 1A solution with zero external feedback parts.

Compared with LM2575-5.0T, the LM2575-5.0WU delivers lower thermal resistance and automated assembly compatibility; compared with MP1584EN-LF-Z, it trades higher frequency and current for plug-and-play simplicity and reduced component count in fixed 5V applications.

Availability

LM2575-5.0WU is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and automotive body control units requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for LM2575-5.0WU 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 analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. It emphasized rugged, easy-to-use integrated power ICs.

The LM2575 product line was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators-targeting cost-sensitive industrial, automotive, and embedded applications where simplicity and thermal performance matter.

FAQ

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

The LM2575-5.0WU has an absolute maximum input voltage rating of 45V, with recommended continuous operation up to 40V. This allows safe use with 24V industrial buses and accommodates automotive load-dump transients. Exceeding 45V risks permanent damage to the internal switch and control circuitry, regardless of duration or duty cycle.

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

No, the LM2575-5.0WU does not require external feedback resistors. It is a fixed-output variant with internal feedback network configured for 5.0V ±3%. Pin 4 (FB) is internally connected to the regulated output node-leaving it unconnected or floating is correct per datasheet guidance. Adding external resistors would disrupt regulation.

What thermal performance can be expected from the LM2575-5.0WU in a standard PCB layout?

With approximately 4 square inches of 2-oz copper connected to the TO-263 thermal pad, the LM2575-5.0WU achieves θ_JA = 45°C/W. At full 1A load and 12V input, junction temperature rise is ~37°C above ambient-well within the –40°C to +125°C operating range. No external heatsink is required under these conditions.

Can the LM2575-5.0WU be used in negative-output (inverting) configurations?

Yes, the LM2575-5.0WU supports inverting buck-boost topology to generate negative voltages. The datasheet includes a verified application circuit converting positive input to regulated negative output (e.g., –5V). Component selection-including Schottky catch diode and proper inductor polarity-is critical to avoid latch-up or regulation failure.

Is the LM2575-5.0WU RoHS compliant and lead-free?

Yes, the LM2575-5.0WU is RoHS compliant and lead-free, manufactured under Micrel's "Y" suffix designation (as indicated in the Ordering Information table). It meets EU Directive 2011/65/EU requirements and uses high-melting-point solder exemption per JEDEC J-STD-609.

LM2575-5.0WU Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

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:: Surface Mount

Supplier Device Package:: TO-263-5

LM2575-5.0WU FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your LM2575-5.0WU 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 LM2575-5.0WU?

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

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

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

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

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

Return procedure for LM2575-5.0WU:

1.Submit a request within 90 days.

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

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