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Microchip Technology LM2575YN
- Part No.:
- LM2575YN
- Manufacturer:
- Microchip Technology
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575YN.pdf
- Description:
- IC REG BUCK ADJ 1A 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,293
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Product details
Overview
LM2575YN from Micrel is a monolithic 1A step-down (buck) switching regulator in TO-220 package, featuring fixed 5V output, 52kHz internal oscillator, ±3% output voltage tolerance at 5V, 4V–40V input range, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575YN datasheet, LM2575YN pinout, LM2575YN application, or LM2575YN equivalent, key selection criteria include guaranteed 1A output current, fixed-frequency operation for predictable EMI filtering, ON/OFF control with <200µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575YN implements a fixed-frequency PWM buck topology with internal 1.23V bandgap reference, error amplifier, and 52kHz oscillator driving a 1A NPN switch. Feedback is taken directly from the output via resistor divider for fixed versions or externally configured for adjustable variants - though LM2575YN is a fixed 5V part.
Protection functions include thermal shutdown triggered at ~150°C junction temperature and peak current limiting at 1.7–3.2A, ensuring robust operation under overload or short-circuit conditions without external circuitry.
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 logic supply without trimming. |
| Max Output Current | 1A continuous - supports microcontroller, sensor, and peripheral rails without derating at 25°C. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial, automotive, and battery-backed systems. |
| Oscillator Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors and simplifies EMI filter design. |
| Efficiency | 82% typical at 12VIN/5VOUT/1A - reduces thermal load vs. linear regulators, often eliminating heatsink need. |
| Standby Current | <200µA when ON/OFF pin = 5V - enables low-power sleep modes in battery-operated equipment. |
| Thermal Shutdown | Active at ~150°C junction - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
LM2575YN uses a 5-pin TO-220 package with exposed tab (pin 3) electrically connected to GND, optimized for vertical mounting with heatsink interface. Thermal resistance θJA is 65°C/W (no heatsink) or 45°C/W (with 4 in² PCB copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Unregulated input supply | Accepts 4–40V DC; requires ≥100µF bulk capacitor close to pin for stability. |
| 2: OUTPUT | Switched output node | Drives external catch diode and inductor; peak current up to 3.2A during switching. |
| 3: GND | Power and signal ground | Common return for internal switch, error amp, and thermal sensor; tab is GND-connected. |
| 4: FEEDBACK | Output voltage sense | Internally tied to 5V reference; unused in fixed-output LM2575YN (not connected externally). |
| 5: ON/OFF | Enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<1.0V) disables output and reduces IQ to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Eliminates external feedback resistors - reduces BOM count and layout sensitivity. |
| Integrated current limit | Peak detection at 1.7–3.2A prevents switch failure during startup or short-circuit events. |
| Internal frequency compensation | Enables stable loop response with only 4 external components - no compensation network required. |
| ON/OFF logic control | Allows system-level power sequencing and low-quiescent-power sleep without external MOSFET. |
| Thermal shutdown protection | Self-resetting shutdown at ~150°C protects device and PCB during thermal overload or airflow loss. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: Converting 24V factory bus to clean 5V for PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/1A with line/load regulation ≤±3%. Use Value: Replaces LM7805-based linear solution, cutting heat dissipation by >75% and enabling compact enclosure design. | Use Scenario: Powering ARM Cortex-M4 MCU and SPI peripherals in edge gateway. IC Role / Device Role / Timing Role: Main 5V system rail generator with ON/OFF control synchronized to host processor sleep states. Use Value: Achieves <200µA standby current during deep-sleep mode while maintaining fast wake-up response. |
| Automotive Body Control | Test Equipment Power |
Use Scenario: Deriving 5V from 12V vehicle battery for door module microcontrollers. IC Role / Device Role / Timing Role: Input-transient-tolerant buck converter handling cold-crank (4V) and load-dump (40V) conditions. Use Value: Operates across full automotive input range without external TVS or pre-regulator, reducing component count. | Use Scenario: Providing stable 5V for benchtop DMM front-end analog circuitry. IC Role / Device Role / Timing Role: Low-noise, high-PSRR pre-regulator feeding LDOs that supply precision ADC references. Use Value: Delivers 82% efficiency at 1A, minimizing self-heating that could drift measurement accuracy. |
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 | Same electrical specs and TO-220 package; non-RoHS compliant version with leaded finish. | No difference in function or layout; differs only in material compliance and solderability profile. | Select LM2575T-5.0 only if RoHS exemption applies or legacy assembly process requires leaded solder. |
| MP1584EN-LF-Z | Higher 1.5A rating, 1.5MHz switching, smaller SOIC-8 package; requires external compensation. | Better suited for space-constrained designs needing higher current or faster transient response. | Choose MP1584EN-LF-Z when board area is critical or >1A load is anticipated; LM2575YN remains optimal for cost-sensitive, thermally managed 1A applications. |
Compared with LM2575T-5.0, LM2575YN offers identical performance with RoHS compliance; versus MP1584EN-LF-Z, it trades higher frequency and current for simpler design, lower EMI filter cost, and proven thermal robustness in TO-220 form factor.
Availability
LM2575YN is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, and automotive body electronics requiring stable component supply with long lifecycle visibility.
Supply support for LM2575YN 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 acquired by Microchip Technology in 2015, known for high-reliability power management and timing solutions.
The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial and embedded power conversion, emphasizing simplicity, thermal resilience, and minimal external component count.
FAQ
What is the maximum input voltage for LM2575YN?
The LM2575YN supports a maximum input voltage of 40V under normal operating conditions, with an absolute maximum rating of 45V. Exceeding 40V may cause premature thermal shutdown or reduced reliability. The device is commonly used in 24V industrial systems and automotive applications where input transients must be managed externally.
Does LM2575YN require external compensation components?
No, LM2575YN does not require external compensation components. Its internal frequency compensation network is fully integrated, allowing stable operation with only four external parts: input capacitor, output capacitor, inductor, and catch diode. This eliminates tuning effort and improves design reproducibility across production batches.
Can LM2575YN be used in negative-output configurations?
Yes, LM2575YN can be configured as a negative-output buck-boost converter by repositioning the inductor and diode - a documented application in the original Micrel datasheet. In this topology, it generates a regulated -5V output from a positive input, useful for op-amp biasing or dual-rail sensor interfaces.
What is the thermal resistance of LM2575YN in TO-220 package?
The LM2575YN in TO-220 package has a junction-to-ambient thermal resistance (θJA) of 65°C/W with minimal PCB copper, or 45°C/W when mounted on 4 in² of copper area. The exposed tab is internally connected to GND, enabling direct heatsink attachment for continuous 1A operation at elevated ambient temperatures.
Is LM2575YN pin-compatible with LM2575-5.0BT?
Yes, LM2575YN and LM2575-5.0BT share identical pinout, electrical specifications, and TO-220 package dimensions. The "Y" suffix denotes RoHS-compliant packaging with lead-free finish and high-melting-point solder exemption, while "B" indicates standard leaded finish - both are mechanically and electrically interchangeable in existing layouts.
LM2575YN 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:
- 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:
- Through Hole
- Supplier Device Package:
- 16-DIP
LM2575YN FAQ
1.How can I place an order for LM2575YN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575YN 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 LM2575YN reliable?
The price and inventory of LM2575YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575YN is usually 5 days.
3.What payment methods are accepted for LM2575YN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575YN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575YN?
LM2575YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575YN 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 LM2575YN?
For technical support, including LM2575YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575YN requirements.
6.How does Aetrix verify that LM2575YN is sourced from the original manufacturer or authorized distributors?
All LM2575YN 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 LM2575YN meets industry standards.
7.What is the process for return or replacement of LM2575YN?
All LM2575YN units undergo pre-shipment inspection (PSI). If there is an issue with LM2575YN, 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 LM2575YN part is unused and in its original packaging.
Return procedure for LM2575YN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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