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Microchip Technology LM2575-12YWM
- Part No.:
- LM2575-12YWM
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575-12YWM.pdf
- Description:
- IC REG BUCK 12V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,844
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Product details
Overview
LM2575-12YWM from Micrel is a fixed-output 12V, 1A step-down (buck) switching regulator in a 24-pin wide SOIC package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance over line and load, internal current limiting, thermal shutdown, and <200µA standby current. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal heatsink area.
For engineers reviewing the LM2575-12YWM datasheet, LM2575-12YWM pinout, LM2575-12YWM application, or LM2575-12YWM equivalent, this page delivers verified electrical parameters, package-specific terminal roles, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.
Technical Context
The LM2575-12YWM integrates a 52kHz oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch driver in a monolithic IC. Its feedback loop uses an internal 12V divider, eliminating external resistors-unlike adjustable variants-and ensures stable regulation across 4V–40V input range.
Protection circuitry includes cycle-by-cycle current limiting (1.3–3.2A peak), thermal shutdown at ~150°C junction temperature, and ON/OFF control with logic-compatible thresholds (VIH ≥ 1.4V, VIL ≤ 1.0V). Standby quiescent current is guaranteed ≤200µA when the ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±3% over full operating range (11.52V–12.48V at 1A load) |
| Max Output Current | 1A continuous; supports full-load operation without external heatsink under typical conditions |
| Input Voltage Range | 4V to 40V DC; enables direct use with 12V/24V industrial rails and unregulated AC-DC outputs |
| Switching Frequency | 52kHz ±10%; enables use of low-cost, standard 330µH inductors with minimal EMI filtering |
| Efficiency | 88% typical at VIN=25V, IOUT=1A; reduces power loss and thermal stress vs. linear regulators |
| Standby Current | ≤200µA when ON/OFF pin = 5V; supports low-power sleep modes in battery-backed systems |
| Thermal Resistance | θJA = 100°C/W (WM package); requires ≤25°C ambient rise at 1A full load with 1 in² copper |
Pinout & Package
The LM2575-12YWM is housed in a 24-pin wide SOIC (WM) package with exposed thermal pad. Pin 1 is VIN; pins 2–4 are NC; pin 5 is OUT; pins 6–10 are GND; pins 11–12 are NC; pin 13 is FB; pins 14–15 are NC; pin 16 is ON/OFF; pins 17–24 are NC. Ground pins are distributed to minimize ground bounce and improve thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection (4V–40V); requires local 100µF bulk capacitor |
| 5 | OUT | Switched output node; connects to inductor and catch diode anode |
| 6–10 | GND | Power and signal ground return; multiple pins reduce impedance and improve thermal path |
| 13 | FB | Feedback input; internally tied to 12V divider-no external resistor needed |
| 16 | ON/OFF | Logic-level enable/disable; <1.0V = ON, >1.4V = OFF; pulls output to high-impedance state |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors-reduces BOM count and layout complexity |
| Integrated 1A switch | Enables complete buck regulator with only 4 external components: inductor, diode, input cap, output cap |
| 52kHz oscillator | Allows use of off-the-shelf, low-cost 330µH inductors instead of custom high-frequency magnetics |
| Thermal shutdown + current limit | Provides autonomous fault protection without external sensing or control circuitry |
| Low standby current | Supports system-level power gating with <200µA draw during disable-critical for energy-sensitive designs |
Applications
| Industrial Power Supply | Embedded Control Module |
|---|---|
Use Scenario: Converting 24V rail to regulated 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 12V/1A with high line/load regulation. Use Value: Replaces linear regulators, reducing heat sink size by >70% and enabling compact DIN-rail mounted enclosures. | Use Scenario: Powering microcontroller peripherals (ADC, DAC, communication ICs) in factory automation controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator with fast transient response and low ripple. Use Value: Delivers 88% efficiency at full load, minimizing board-level thermal gradients and improving long-term reliability. |
| On-Card DC-DC Converter | Pre-regulator for Linear LDOs |
Use Scenario: Generating 12V on PCBs where space is constrained and input is 36V unregulated from AC-DC front-end. IC Role / Device Role / Timing Role: High-efficiency step-down stage before final LDO filtering. Use Value: Enables use of standard 330µH inductors and Schottky diodes-reducing component sourcing risk. | Use Scenario: Feeding low-noise LDOs (e.g., for analog sensor signal chains) from noisy 24V industrial bus. IC Role / Device Role / Timing Role: Efficient pre-regulator lowering input-to-output differential for downstream LDOs. Use Value: Reduces LDO power dissipation by >65%, allowing smaller packages and eliminating need for heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-12WU | Same electrical specs; TO-263-5 package with exposed tab for lower θJC (2°C/W) | Better thermal performance in high-ambient or sealed enclosures; requires different footprint | Select when board-level thermal management is critical and layout allows TO-263 mounting. |
| LM2596-12 | Higher 150kHz switching frequency, 3A rating, ±2% output tolerance, but requires external compensation | Enables smaller inductors/caps; suited for higher-current or space-constrained designs | Choose when upgrading current capability or reducing passive size is prioritized over pin compatibility. |
Compared with LM2575-12WU and LM2596-12, the LM2575-12YWM offers proven 52kHz stability with minimal external parts in a surface-mount SOIC-ideal for cost-sensitive, thermally moderate industrial applications where design reuse and supply chain maturity matter most.
Availability
LM2575-12YWM is available at Aetrix Electronics and suitable for industrial power supplies, embedded control modules, and on-card DC-DC converters requiring stable component supply, RoHS-compliant packaging, and long-lifecycle support.
Supply support for LM2575-12YWM 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.
The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators-targeting industrial, automotive, and telecom power systems needing reliable, low-component-count buck conversion.
FAQ
What is the maximum input voltage for the LM2575-12YWM?
The LM2575-12YWM supports a maximum input voltage of 40V DC, with absolute maximum rating at 45V. Operation above 40V risks exceeding safe operating area limits and may trigger thermal shutdown or damage the internal switch. For reliable long-term use, keep input within 4V–40V as specified in the datasheet.
Does the LM2575-12YWM require external feedback resistors?
No-the LM2575-12YWM is a fixed-output variant with internal 12V feedback divider. Unlike adjustable versions (e.g., LM2575), it does not use the FB pin for external resistor networks. Pin 13 (FB) is internally connected and must remain unconnected in standard operation.
What package type is used for the LM2575-12YWM?
The LM2575-12YWM uses a 24-pin wide SOIC (WM) package with gull-wing leads and an exposed thermal pad. This surface-mount package provides better thermal performance than DIP variants and is compatible with standard reflow soldering processes.
Can the LM2575-12YWM be used in negative-output configurations?
Yes-the LM2575-12YWM can be configured as an inverting buck-boost converter to generate negative voltages. In this topology, the IC regulates the magnitude of the negative output (e.g., –12V) using the same internal feedback structure, with appropriate external component selection per Micrel Application Note AN-12.
What is the guaranteed output voltage tolerance for the LM2575-12YWM?
The LM2575-12YWM guarantees ±3% output voltage tolerance across full operating conditions: 0.2A–1A load, 15V–40V input, and –40°C to +85°C ambient. At 1A load and 25°C, typical output is 12.0V with measured min/max of 11.52V/12.48V.
LM2575-12YWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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):
- 12V
- 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:
- 24-SOIC
LM2575-12YWM FAQ
1.How can I place an order for LM2575-12YWM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12YWM 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 LM2575-12YWM reliable?
The price and inventory of LM2575-12YWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12YWM is usually 5 days.
3.What payment methods are accepted for LM2575-12YWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-12YWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-12YWM?
LM2575-12YWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12YWM 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 LM2575-12YWM?
For technical support, including LM2575-12YWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12YWM requirements.
6.How does Aetrix verify that LM2575-12YWM is sourced from the original manufacturer or authorized distributors?
All LM2575-12YWM 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 LM2575-12YWM meets industry standards.
7.What is the process for return or replacement of LM2575-12YWM?
All LM2575-12YWM units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12YWM, 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 LM2575-12YWM part is unused and in its original packaging.
Return procedure for LM2575-12YWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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