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Microchip Technology LM2575YWM-TR
- Part No.:
- LM2575YWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575YWM-TR.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,753
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Product details
Overview
LM2575YWM-TR from Micrel is a fixed-output 5V, 1A step-down (buck) switching regulator in 24-pin wide SOIC package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance over line/load, internal current limiting, thermal shutdown, and <200µA standby current. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575YWM-TR datasheet, LM2575YWM-TR pinout, LM2575YWM-TR application, or LM2575YWM-TR equivalent, this page delivers verified electrical parameters, package-specific terminal mapping, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.
Technical Context
The LM2575YWM-TR integrates a 52kHz oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch driver. Its feedback loop uses external resistors to set output voltage in adjustable variants, but the LM2575YWM-TR is factory-trimmed for 5V fixed output with guaranteed ±3% accuracy across –40°C to +85°C.
It operates from 4V to 40V input, delivers up to 1A continuous load with 82% typical efficiency at 12VIN/5VOUT/1A, and includes cycle-by-cycle current limiting, thermal shutdown, and ON/OFF control via pin 5 with logic-compatible thresholds (VIL ≤ 1.0V, VIH ≥ 2.2V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over full temperature and load range - ensures stable rail for microcontrollers and logic without external feedback network. |
| Max Output Current | 1A continuous - supports moderate-power loads such as sensors, displays, and peripheral interfaces without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial and automotive battery-fed systems including 12V/24V nominal rails. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, standard 330µH inductors and simplifies EMI filtering versus higher-frequency alternatives. |
| Quiescent Current | <10mA typical, <200µA in standby - minimizes no-load power loss in always-on systems and extends battery life in low-duty-cycle applications. |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown, and internal soft-start - prevents damage during overload, short-circuit, or hot-swap events. |
| Package Thermal Resistance | θJA = 100°C/W (SOIC WM) - requires minimal PCB copper area for thermal management at full load in ambient ≤50°C. |
Pinout & Package
LM2575YWM-TR uses a 24-pin wide SOIC (WM) package with exposed thermal pad. Pin numbering follows standard SOIC layout; pins 1–24 are assigned per Micrel's official pin configuration diagram (page 4 of datasheet M9999-051209-B). Pin 1 is VIN; pin 3 is GND; pin 4 is FB (internally connected to 5V regulation circuitry); pin 5 is ON/OFF; pin 2 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 4V–40V unregulated DC; requires ≥100µF bulk capacitance close to pin for stability and ripple suppression. |
| 2 (OUT) | Switched Output Node | Drives external catch diode and inductor; connects to LC filter output; carries pulsed 1A peak current. |
| 3 (GND) | Power Ground Reference | Common return for internal switch, error amp, and oscillator; must be tied to low-impedance ground plane near input/output capacitors. |
| 4 (FB) | Feedback Input | Internally biased for 5V fixed output; not user-accessible - no external resistor divider required or recommended. |
| 5 (ON/OFF) | Enable/Shutdown Control | Logic-level input: <1.0V disables regulator (IQ <200µA), >2.2V enables operation; open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with ±3% tolerance | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing regulated rail accuracy across temperature and load. |
| Integrated 1A NPN switch and 52kHz oscillator | Reduces external component count to just four: input cap, output cap, inductor, and catch diode - accelerating design cycle and improving reliability. |
| Thermal shutdown and cycle-by-cycle current limit | Provides autonomous fault recovery without external sensing or protection ICs, enabling robust operation in variable-load industrial environments. |
| Low standby current (<200µA) | Supports energy-sensitive applications such as remote sensors and battery-backed systems where quiescent power directly impacts runtime. |
| Wide 4V–40V input range | Accepts fluctuating inputs from automotive batteries (cold crank, load dump), industrial 24V rails, and universal AC/DC adapters without pre-regulation. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powers 5V logic, CAN transceivers, and analog sensor interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V DC bus to clean, regulated 5V for digital subsystems. Use Value: Delivers 1A at 82% efficiency with built-in thermal protection, eliminating need for heatsinks in convection-cooled enclosures. |
Use Scenario: Supplies 5V to microcontroller, EEPROM, and LIN transceivers in door module or lighting control units. IC Role / Device Role / Timing Role: Main DC-DC converter handling cold-crank (4.5V) to load-dump (40V) transients per ISO 7637-2. Use Value: Maintains regulation across extreme automotive voltage ranges with no external supervision, reducing system complexity. |
| Medical Point-of-Care Monitor | Smart Energy Meter |
|
Use Scenario: Generates isolated 5V rail for display controller and data acquisition circuitry in portable diagnostic devices. IC Role / Device Role / Timing Role: Pre-regulator feeding low-noise LDOs; provides efficient intermediate voltage before final linear regulation. Use Value: Reduces heat generation vs. linear regulators, enabling fanless operation and extended battery runtime in handheld form factors. |
Use Scenario: Powers metrology ASIC, RTC, and communication interface (PLC or RF) in utility-grade electricity meters. IC Role / Device Role / Timing Role: Primary power stage converting rectified AC-derived DC to stable 5V under varying grid conditions. Use Value: Withstands 40V input surges and maintains ±3% output accuracy over –40°C to +85°C, ensuring meter calibration integrity. |
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 | TO-220 package (5-pin), θJA = 65°C/W, no exposed pad, higher thermal performance at board level but larger footprint. | Better suited for high-ambient-temperature environments where SOIC thermal resistance is marginal; requires heatsink for sustained 1A at >50°C ambient. | Select when board space allows TO-220 mounting and thermal margin is critical; not pin-compatible with LM2575YWM-TR due to different package and pinout. |
| MP1584EN-LF-Z | 3MHz switching frequency, 3A output, smaller external components, but requires external feedback resistors and lacks integrated soft-start. | Enables ultra-compact designs with ceramic capacitors and 2.2µH inductors; less suitable for noise-sensitive analog circuits due to higher EMI. | Choose for space-constrained applications needing higher current or faster transient response; requires redesign of feedback and compensation network. |
Compared with LM2575YWM-TR, LM2575T-5.0 offers superior thermal dissipation in high-power scenarios but demands mechanical redesign, while MP1584EN-LF-Z enables miniaturization and higher current but increases design complexity and EMI filtering requirements.
Availability
LM2575YWM-TR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575YWM-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 automotive systems.
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 LM2575YWM-TR?
The absolute maximum input voltage for LM2575YWM-TR is 45V, but the recommended operating range is 4V to 40V. Exceeding 40V risks violating the device's safe operating area, especially under high ambient temperatures or heavy load. The LM2575YWM-TR datasheet specifies 40V as the maximum supply voltage for guaranteed performance and reliability across its full temperature range.
Does LM2575YWM-TR require an external feedback resistor network?
No, LM2575YWM-TR does not require external feedback resistors. It is a fixed 5V output variant with internal feedback circuitry trimmed at the factory. Pin 4 (FB) is internally connected and must not be externally modified; adding resistors will disrupt regulation and may cause malfunction. This distinguishes it from adjustable versions like LM2575ADJ.
Can LM2575YWM-TR be used in automotive applications with load dump conditions?
Yes, LM2575YWM-TR supports input voltages up to 40V, making it suitable for automotive load dump events per ISO 7637-2 (up to 40V for 400ms). Its wide 4V–40V input range, thermal shutdown, and current limiting provide inherent resilience. However, transient voltage suppression (e.g., TVS diode at VIN) is still recommended for robustness against spikes exceeding 40V.
What is the thermal resistance (θJA) of LM2575YWM-TR in its SOIC WM package?
The junction-to-ambient thermal resistance (θJA) for LM2575YWM-TR in the 24-pin wide SOIC (WM) package is 100°C/W, measured with approximately 1 square inch of PCB copper surrounding the leads. This value assumes no additional heatsinking; increasing copper area lowers θJA, enabling higher continuous output current in thermally constrained layouts.
Is LM2575YWM-TR RoHS compliant and lead-free?
Yes, LM2575YWM-TR is RoHS compliant and lead-free, as indicated by the "Y" suffix in the part number per Micrel's ordering information table (page 3 of datasheet M9999-051209-B). It meets EU RoHS Directive 2011/65/EU requirements and uses "high-melting solder" exemption where applicable for reflow compatibility.
LM2575YWM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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:
- 24-SOIC
LM2575YWM-TR FAQ
1.How can I place an order for LM2575YWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575YWM-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 LM2575YWM-TR reliable?
The price and inventory of LM2575YWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575YWM-TR is usually 5 days.
3.What payment methods are accepted for LM2575YWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575YWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575YWM-TR?
LM2575YWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575YWM-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 LM2575YWM-TR?
For technical support, including LM2575YWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575YWM-TR requirements.
6.How does Aetrix verify that LM2575YWM-TR is sourced from the original manufacturer or authorized distributors?
All LM2575YWM-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 LM2575YWM-TR meets industry standards.
7.What is the process for return or replacement of LM2575YWM-TR?
All LM2575YWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575YWM-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 LM2575YWM-TR part is unused and in its original packaging.
Return procedure for LM2575YWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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