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Microchip Technology LM2575WU-TR
- Part No.:
- LM2575WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575WU-TR.pdf
- Description:
- IC REG BUCK ADJ 1A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,822
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Product details
Overview
LM2575WU-TR from Micrel is an adjustable 1A step-down (buck) switching regulator in TO-263-5 package, featuring a fixed 52kHz oscillator, internal current limiting, thermal shutdown, and ±2% feedback voltage accuracy over –40°C to +85°C. It operates from 4V to 40V input and delivers 1.23V–37V output, enabling compact, high-efficiency DC/DC conversion in industrial power supplies.
For engineers reviewing the LM2575WU-TR datasheet, LM2575WU-TR pinout, LM2575WU-TR application, or LM2575WU-TR equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with functional differences, and supply support for production ramp-up.
Technical Context
The LM2575WU-TR integrates a 52kHz fixed-frequency oscillator, bandgap reference (1.23V), error amplifier, PWM comparator, and 1A NPN switch driver in a monolithic IC. Its internal cycle-by-cycle current limit and thermal shutdown provide fault protection without external sensing circuitry.
It uses external feedback resistors to set output voltage, with guaranteed ±2% feedback voltage tolerance across temperature and load. Standby quiescent current is ≤200µA when ON/OFF pin is high, enabling low-power shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1A continuous output - supports single-rail loads like microcontrollers, sensors, or logic without derating at full ambient range. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial rails (e.g., 12V/24V/36V systems) and battery-backed applications down to 4V. |
| Feedback Voltage | 1.23V ±2% - enables precise output setting from 1.23V to 37V using two external resistors; tolerance directly impacts output accuracy. |
| Oscillator Frequency | 52kHz ±10% - fixed frequency simplifies EMI filtering and allows use of standard off-the-shelf inductors (e.g., 330µH). |
| Efficiency | Typically >80% at 1A - reduces thermal load vs. linear regulators; eliminates need for heatsink in many 5V/12V applications. |
| Standby Current | ≤200µA - enables low-power system sleep modes; critical for battery-powered devices requiring long standby duration. |
| Protection Features | Cycle-by-cycle current limit + thermal shutdown - prevents damage during short-circuit or overload without external circuitry. |
Pinout & Package
LM2575WU-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, 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) | Input Power Supply | Accepts 4V–40V unregulated DC; requires ≥100µF input capacitance near pin for stability and ripple suppression. |
| 2 (OUTPUT) | Switch Node / Power Output | Drives external catch diode and inductor; high dI/dt node - layout must minimize trace inductance to reduce ringing. |
| 3 (GND) | Power Ground / Thermal Pad | Common return for internal circuits and thermal dissipation path; must be connected to large PCB copper area for thermal performance. |
| 4 (FB) | Feedback Input | High-impedance (≤100nA bias) node monitoring output via resistor divider; sensitive to noise - route away from switching nodes. |
| 5 (ON/OFF) | Enable/Shutdown Control | Logic-level input: <0.8V = ON, >2.4V = OFF; pulls internal switch gate low to halt oscillation and reduce IQ to ≤200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 52kHz oscillator | Enables predictable EMI profile and compatibility with standardized inductors - eliminates need for external timing components. |
| Internal current limit & thermal shutdown | Provides self-protection under fault conditions without external sensing - reduces BOM count and improves reliability in harsh environments. |
| ±2% feedback voltage accuracy | Ensures tight output regulation across temperature and line/load variations - critical for powering precision analog or mixed-signal circuits. |
| Low standby current (≤200µA) | Supports energy-efficient system architectures with deep-sleep states - extends battery life in portable instrumentation and remote sensors. |
| TO-263-5 package with thermal pad | Delivers superior thermal performance vs. TO-220 in space-constrained PCBs - junction-to-case θJC = 2°C/W enables higher power density. |
Applications
| Industrial Power Supply | Embedded Microcontroller Rail |
|---|---|
|
Use Scenario: Converting 24V factory bus to stable 5V for PLC I/O modules operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V/1A output with built-in fault protection and thermal management. Use Value: Eliminates need for external current sense or thermal cutoff; TO-263 thermal pad ensures reliable operation without heatsink. |
Use Scenario: Generating 3.3V for ARM Cortex-M4 MCU, peripherals, and ADC in battery-powered edge sensor node. IC Role / Device Role / Timing Role: Adjustable buck converter configured for 3.3V output, controlled via ON/OFF pin for system-level power gating. Use Value: ≤200µA standby current extends battery life; ±2% feedback accuracy maintains ADC reference stability. |
| On-Card DC/DC Converter | Negative Voltage Generator |
|
Use Scenario: Local 12V-to-5V conversion on a dense FPGA carrier board where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact surface-mount buck regulator replacing linear LDO to reduce heat and improve efficiency. Use Value: TO-263 footprint saves board area vs. TO-220; 80%+ efficiency cuts board-level thermal load by >2W. |
Use Scenario: Generating –5V rail from +12V input for op-amp biasing in analog front-end of medical signal conditioner. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2575WU-TR with external inductor and diode. Use Value: Leverages same control architecture and protection features as standard buck mode - no additional IC required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-5.0 | Fixed 5V output, TO-220-5 package, ±3% output tolerance, no FB pin. | Eliminates feedback resistor network but lacks output flexibility; higher thermal resistance (θJA = 65°C/W) limits power density. | Select when 5V output is fixed and board space permits through-hole mounting. |
| MP1584EN-LF-Z | 34V input, 1.5A output, 1.5MHz switching, SOIC-8, ±1.5% feedback accuracy. | Higher frequency enables smaller magnetics but increases EMI sensitivity; requires external compensation. | Select when size reduction is critical and design team can manage higher-frequency layout constraints. |
Compared with LM2575WU-TR, LM2575T-5.0 trades adjustability and thermal performance for simplicity and cost, while MP1584EN-LF-Z offers higher integration and frequency at the expense of added design complexity and reduced fault-protection transparency.
Availability
LM2575WU-TR is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller rails, and on-card DC/DC converters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM2575WU-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 semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Its legacy power ICs remain widely deployed in industrial and telecom infrastructure.
The LM2575 series was designed as a drop-in high-efficiency replacement for three-terminal linear regulators, targeting cost-sensitive, thermally constrained applications where simplicity and reliability outweigh advanced feature sets.
FAQ
What is the maximum input voltage rating for LM2575WU-TR?
The absolute maximum input voltage for LM2575WU-TR is 45V, but the recommended operating range is 4V to 40V per the datasheet. Exceeding 40V risks violating safe operating area limits under transient conditions, especially at elevated temperatures. For designs with potential 42V automotive surges, external clamping or pre-regulation is advised before LM2575WU-TR input.
Does LM2575WU-TR require an external diode, and what type is recommended?
Yes, LM2575WU-TR requires an external Schottky catch diode connected between OUTPUT and GND. The datasheet specifies MBR360 (3A, 60V) or 1N5822 (3A, 40V) - both selected for low forward voltage (<0.55V) and fast recovery to minimize conduction loss and reverse-recovery spikes. Using a standard PN diode degrades efficiency and may cause instability.
Can LM2575WU-TR be used in an inverting buck-boost configuration?
Yes, LM2575WU-TR supports inverting buck-boost topology to generate negative output voltages. The functional diagram and typical applications section confirm this capability using the same pinout and control architecture. Output polarity reverses, but feedback loop, current limit, and thermal protection remain fully functional - no modification to LM2575WU-TR itself is needed.
What is the thermal resistance (θJA) of LM2575WU-TR in standard PCB layout?
LM2575WU-TR in TO-263-5 has a typical junction-to-ambient thermal resistance (θJA) of 45°C/W when mounted on 1 square inch of 2-oz copper. This value assumes direct connection of the exposed thermal pad to the copper plane. Without proper pad connection or insufficient copper area, θJA degrades significantly - up to 80°C/W - risking thermal shutdown at full 1A load.
How does the ON/OFF pin function, and what logic levels enable shutdown?
The ON/OFF pin of LM2575WU-TR controls device enable state: ≤0.8V (typically grounded) enables regulation; ≥2.4V (e.g., pulled to VIN or logic high) disables switching and reduces quiescent current to ≤200µA. The pin draws ≤30µA in either state, making it compatible with microcontroller GPIO without level-shifting. No external pull-up is required for default-on operation.
LM2575WU-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- 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
LM2575WU-TR FAQ
1.How can I place an order for LM2575WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575WU-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 LM2575WU-TR reliable?
The price and inventory of LM2575WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575WU-TR is usually 5 days.
3.What payment methods are accepted for LM2575WU-TR?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575WU-TR?
LM2575WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575WU-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 LM2575WU-TR?
For technical support, including LM2575WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575WU-TR requirements.
6.How does Aetrix verify that LM2575WU-TR is sourced from the original manufacturer or authorized distributors?
All LM2575WU-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 LM2575WU-TR meets industry standards.
7.What is the process for return or replacement of LM2575WU-TR?
All LM2575WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575WU-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 LM2575WU-TR part is unused and in its original packaging.
Return procedure for LM2575WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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