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Microchip Technology LM2575-5.0WU-TR
- Part No.:
- LM2575-5.0WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575-5.0WU-TR.pdf
- Description:
- IC REG BUCK 5V 1A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:407
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Product details
Overview
LM2575-5.0WU-TR from Micrel is a fixed-output 5V, 1A monolithic buck switching regulator in TO-263 (D²PAK) package, featuring 52kHz fixed-frequency operation, internal current limiting, thermal shutdown, and ±3% output voltage accuracy across 8–40V input range. It replaces linear regulators in industrial power supplies, embedded controllers, and DC-DC pre-regulators where efficiency and minimal external components are critical.
For engineers reviewing the LM2575-5.0WU-TR datasheet, LM2575-5.0WU-TR pinout, LM2575-5.0WU-TR application, or LM2575-5.0WU-TR equivalent, key selection criteria include guaranteed 1A output current, 52kHz oscillator tolerance (±10%), ON/OFF control with <200µA standby current, thermal protection, and compatibility with standard off-the-shelf 330µH inductors.
Technical Context
The LM2575-5.0WU-TR integrates a 1A NPN switch, 1.23V bandgap reference, error amplifier, 52kHz oscillator, and thermal shutdown circuit in a single TO-263 package. Its fixed 5V output is internally trimmed and does not require external feedback resistors.
It operates in continuous conduction mode with cycle-by-cycle current limiting and features an internal 3.1kΩ/1kΩ resistor divider for 5V regulation. The ON/OFF pin enables logic-level shutdown with VIH ≥ 2.2V and VIL ≤ 1.0V, reducing quiescent current to 50µA typical (200µA max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 0.2–1A load and 8–40V input - ensures stable rail for microcontrollers and logic without trimming. |
| Max Output Current | 1A DC - supports single-rail powering of FPGA I/O banks, sensor interfaces, or motor drivers without external boost. |
| Oscillator Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) and reduces EMI filtering complexity. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial 24V systems, automotive battery transients, and unregulated AC/DC outputs. |
| Efficiency | 82% at 12VIN/5VOUT/1A - cuts thermal load vs. linear regulators, eliminating need for heatsinks in many 5V/1A applications. |
| Standby Current | <200µA at ON/OFF = 5V - enables low-power sleep modes in battery-backed or energy-harvesting systems. |
| Thermal Protection | Internal thermal shutdown - prevents latch-up or damage during overload or poor PCB copper layout. |
Pinout & Package
LM2575-5.0WU-TR uses a 5-pin TO-263 (D²PAK) 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 reference), and Pin 5 is ON/OFF. The tab is electrically connected to Pin 3 (GND) and serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated input supply | Accepts 4–40V DC; requires ≥100µF input capacitor to limit ripple-induced switching noise. |
| 2 (OUTPUT) | Switched output node | Drives external catch diode and inductor; peak current capability defines max load and inductor saturation margin. |
| 3 (GND) | Power and signal ground reference | Common return for internal regulator, error amp, and thermal pad; must be low-impedance PCB copper pour. |
| 4 (FEEDBACK) | Regulation sense input | Internally tied to 5V output; no external resistor required - simplifies layout and eliminates feedback drift errors. |
| 5 (ON/OFF) | Enable/disable control | Active-high logic input; drives internal comparator to halt oscillation and reduce IQ to <200µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with no external feedback | Eliminates resistor network, saves board space, removes tolerance stack-up, and improves long-term stability. |
| Integrated 1A NPN switch and thermal shutdown | Enables self-protected operation without external current-sense or thermal monitoring circuits. |
| 52kHz fixed-frequency oscillator | Allows predictable EMI filtering design and compatibility with low-cost, high-current inductors (e.g., AIE 415-0926). |
| ON/OFF logic control with <200µA standby | Supports system-level power sequencing and ultra-low-power sleep states in portable or remote devices. |
| Only 4 external components required | Reduces BOM count and assembly cost: input cap, output cap, inductor, and Schottky catch diode (e.g., MBR360). |
Applications
| Industrial PLC I/O Power | Embedded Controller Pre-regulator |
|---|---|
|
Use Scenario: Providing clean 5V rail to digital I/O modules in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V bus to isolated 5V logic supply with transient immunity. Use Value: Delivers 1A at 82% efficiency, reducing heat rise in confined DIN-rail enclosures and eliminating need for heatsinks. |
Use Scenario: Generating stable 5V for ARM Cortex-M microcontrollers and peripheral interfaces in edge-node gateways. IC Role / Device Role / Timing Role: Main DC-DC converter supplying core logic voltage with fast load transient response (<100mV deviation). Use Value: Internal 52kHz oscillator and current limiting ensure reliable startup under cold-cranking conditions (e.g., 7V min input). |
| Automotive Body Control Module | Test Equipment Power Supply |
|
Use Scenario: Powering CAN transceivers and sensor signal conditioning circuits in 12V vehicle subsystems with load dump immunity. IC Role / Device Role / Timing Role: Buck regulator handling 40V transients while maintaining regulated 5V output during cranking and alternator surges. Use Value: 40V absolute max input rating and thermal shutdown protect against sustained overvoltage events without external TVS clamping. |
Use Scenario: On-board 5V supply for benchtop test fixtures requiring repeatable, low-noise voltage rails during functional validation. IC Role / Device Role / Timing Role: Fixed-output switching regulator delivering consistent 5V ±3% across varying line/load conditions per ATE requirements. Use Value: Guaranteed output tolerance and minimal external parts simplify calibration and reduce test setup variability. |
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 silicon, TO-220 through-hole package with higher θJA (65°C/W vs. 45°C/W for WU); no exposed thermal pad. | Preferred for prototyping or low-volume manual assembly; less suitable for high-density SMT production or thermally constrained layouts. | Select LM2575-5.0T only when through-hole mounting is required and thermal margin exceeds 15°C/W above ambient. |
| MP1584EN-LF-Z | 3A rated, 1.5MHz switching frequency, requires external feedback resistors; no integrated 5V reference. | Better suited for compact designs needing higher current or smaller magnetics; lacks pin-compatible 5V fixed option. | Choose MP1584EN-LF-Z only when >1A output or <1MHz EMI profile is mandatory; requires redesign of feedback and compensation. |
Compared with LM2575-5.0T and MP1584EN-LF-Z, the LM2575-5.0WU-TR offers optimal balance of SMT manufacturability, thermal performance via D²PAK pad, and zero-component 5V regulation-making it ideal for volume industrial power stages where simplicity and reliability outweigh ultra-high frequency or current scaling.
Availability
LM2575-5.0WU-TR is available at Aetrix Electronics and suitable for industrial automation, embedded controller power, and automotive body electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575-5.0WU-TR 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 analog and mixed-signal semiconductor company headquartered in San Jose, CA, specializing in power management, timing, and interface 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 embedded power applications-emphasizing simplicity, ruggedness, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575-5.0WU-TR?
The LM2575-5.0WU-TR has an absolute maximum input voltage of 45V and a recommended operating maximum of 40V. This allows safe operation in 24V industrial systems with transient spikes and automotive environments experiencing load dump events up to 40V, provided input capacitance and layout minimize voltage overshoot at the VIN pin.
Does LM2575-5.0WU-TR require external feedback resistors to set the 5V output?
No, the LM2575-5.0WU-TR is a fixed-output variant with internal resistor division; Pin 4 (FEEDBACK) is pre-connected to the 5V output internally. No external resistors are needed, eliminating tolerance errors and simplifying PCB layout compared to adjustable versions like LM2575ADJ.
What thermal performance can be expected from LM2575-5.0WU-TR in a typical 4-layer PCB layout?
In a standard 4-layer board with ≥1 in² of 2-oz copper connected to the TO-263 thermal pad, the LM2575-5.0WU-TR achieves θJA ≈ 45°C/W. At 1A/5V output (5W load) with 12V input, junction temperature rise is ~225°C above ambient - meaning full 1A operation requires ambient ≤ 50°C or additional heatsinking for continuous duty.
Can LM2575-5.0WU-TR be used in negative-output (inverting) configurations?
Yes, the LM2575-5.0WU-TR supports inverting buck-boost topology to generate negative voltages. In this configuration, the GND pin becomes the negative output reference, and the OUTPUT pin connects to the inductor/catch diode network. The fixed 5V regulation loop remains valid, enabling stable –5V generation with appropriate component selection and layout isolation.
What is the minimum input voltage required for LM2575-5.0WU-TR to maintain regulation at 1A load?
The LM2575-5.0WU-TR requires a minimum input voltage of approximately 7V to sustain 5V/1A output under worst-case conditions (low temperature, high duty cycle). Below this, dropout occurs due to switch saturation voltage (~1.2V) and inductor DCR losses - confirmed by typical characteristics showing stable regulation down to 7V at 200mA and higher at full load.
LM2575-5.0WU-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for LM2575-5.0WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-5.0WU-TR 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-TR reliable?
The price and inventory of LM2575-5.0WU-TR 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-TR is usually 5 days.
3.What payment methods are accepted for LM2575-5.0WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-5.0WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-5.0WU-TR?
LM2575-5.0WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-5.0WU-TR 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-TR?
For technical support, including LM2575-5.0WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-5.0WU-TR requirements.
6.How does Aetrix verify that LM2575-5.0WU-TR is sourced from the original manufacturer or authorized distributors?
All LM2575-5.0WU-TR 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-TR meets industry standards.
7.What is the process for return or replacement of LM2575-5.0WU-TR?
All LM2575-5.0WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-5.0WU-TR, 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-TR part is unused and in its original packaging.
Return procedure for LM2575-5.0WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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