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Microchip Technology LM2575-3.3YWM
- Part No.:
- LM2575-3.3YWM
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575-3.3YWM.pdf
- Description:
- IC REG BUCK 3.3V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,349
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Product details
Overview
LM2575-3.3YWM from Micrel is a fixed-output 3.3V, 1A step-down (buck) switching regulator with 52kHz fixed-frequency operation, ±3% output voltage tolerance over line/load conditions, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 4V to 40V input and delivers high-efficiency regulation for embedded power rails in industrial control modules.
For engineers reviewing the LM2575-3.3YWM datasheet, LM2575-3.3YWM pinout, LM2575-3.3YWM application, or LM2575-3.3YWM equivalent, key selection criteria include input voltage range, guaranteed 1A output current, SOIC-24 package thermal resistance (100°C/W), standby current (<200µA), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575-3.3YWM integrates a 52kHz oscillator, error amplifier with 1.23V internal reference, PWM comparator, and 1A NPN switch driver in a monolithic IC. Its feedback loop uses a fixed-resistor divider network tied to the FB pin, eliminating external compensation components.
Protection circuitry includes thermal shutdown triggered at ~150°C junction temperature and peak current limiting set to 1.7–3.2A. The ON/OFF pin supports logic-level shutdown with <200µA standby current when pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over 0.2–1A load and 8–40V input - ensures stable microcontroller core rail without trimming. |
| Max Output Current | 1A continuous - supports single-rail digital subsystems including ARM Cortex-M peripherals. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial supplies, automotive battery transients, and unregulated DC sources. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) with minimal EMI filtering. |
| Efficiency | 75% at 12VIN/3.3VOUT/1A - reduces thermal load vs. linear regulators; no heatsink required in many PCB layouts. |
| Standby Current | <200µA - enables low-power sleep modes in battery-backed or energy-sensitive applications. |
| Thermal Resistance | θJA = 100°C/W (SOIC-24) - defines maximum power dissipation (1.25W) before thermal shutdown at 85°C ambient. |
Pinout & Package
LM2575-3.3YWM is housed in a 24-pin wide SOIC (WM) package with exposed thermal pad (pin 13 connected to GND). Pin assignments are identical across all fixed-output WM variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 | No Connect (NC) | Unused pins; must remain unconnected per datasheet - no internal function or tie requirement. |
| 13 | Power Ground (PWR GND) | Main return path for switch current; requires direct connection to large copper pour for thermal conduction. |
| 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 | No Connect (NC) | Unused pins; electrically isolated - no routing or soldering needed. |
| VIN (Pin 16) | Input Supply | Accepts 4–40V unregulated DC; requires ≥100µF bulk capacitor placed within 5mm of pin. |
| OUT (Pin 23) | Switched Output | Drives external catch diode and inductor; peak voltage reaches VIN during switch-off - select Schottky diode rated ≥45V. |
| GND (Pin 13) | Signal & Power Ground | Single-point ground reference for FB, ON/OFF, and internal regulator - separate from high-current PWR GND traces. |
| ON/OFF (Pin 15) | Enable Control | Active-low logic input; <0.8V = ON, >2.4V = OFF - compatible with 3.3V/5V GPIO without level shift. |
| FB (Pin 14) | Feedback Input | Internally tied to 3.3V output via factory-trimmed resistor network - not accessible for adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V Output | Factory-trimmed resistor network eliminates external feedback components - reduces BOM count and layout sensitivity. |
| Integrated Protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or poor heatsinking. |
| Low External Part Count | Requires only four external components: input cap, output cap, inductor, and catch diode - accelerates design validation. |
| Wide Input Range | 4V–40V operation supports 5V USB-derived, 12V industrial, and 24V PLC power buses without pre-regulation. |
| SOIC-24 Thermal Performance | 100°C/W θJA enables 1A operation at 85°C ambient with minimal PCB copper - avoids TO-220 mechanical constraints. |
Applications
| Industrial Sensor Node | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Powering 3.3V microcontrollers, ADCs, and RS-485 transceivers in DIN-rail mounted sensor hubs operating from 24V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V field supply to clean 3.3V logic rail with ripple <100mVPP. Use Value: Eliminates need for discrete linear regulator + heatsink; maintains regulation during 40V load-dump transients. | Use Scenario: Generating local 3.3V supply for FPGA configuration memory and digital isolators in modular PLC backplanes. IC Role / Device Role / Timing Role: Point-of-load converter delivering 1A with fast transient response to handle FPGA configuration current spikes. Use Value: 75% efficiency minimizes board-level heat accumulation in densely packed chassis; ON/OFF pin enables firmware-controlled power sequencing. |
| Medical Diagnostic Handheld | Automotive Body Control Module (BCM) |
Use Scenario: Providing regulated 3.3V for touch controller, BLE radio, and display driver in battery-powered portable diagnostics equipment. IC Role / Device Role / Timing Role: Main system regulator operating from 7.4V Li-ion pack (2S) with automatic low-power mode during standby. Use Value: <200µA standby current extends battery life between measurements; 4V minimum input supports discharge down to 3.2V/cell. | Use Scenario: Powering CAN transceivers and microcontroller peripherals in under-hood BCMs exposed to 12V battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Robust buck stage maintaining 3.3V output during cranking events where input drops to 6V for 100ms. Use Value: Guaranteed 1A output at 6VIN ensures uninterrupted CAN communication; thermal shutdown prevents latch-up in high-ambient environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-3.3WU | TO-263-5 package (θJA ≈ 45°C/W); same electrical specs; bent leads for surface-mount reflow. | Better thermal performance for high-ambient or high-duty-cycle use; requires different footprint and stencil. | Select when board space allows larger footprint and thermal management demands lower junction rise. |
| LM2596-3.3 | 150kHz switching frequency; higher efficiency (~85% at 12VIN/3.3VOUT); requires external compensation. | Enables smaller inductors/caps but increases EMI filtering complexity; not drop-in compatible due to different pinout and feedback architecture. | Choose for new designs prioritizing size/efficiency over legacy compatibility; not suitable for direct replacement. |
Compared with LM2575-3.3YWM, LM2575-3.3WU offers superior thermal handling in compact layouts, while LM2596-3.3 trades simplicity for higher frequency and efficiency - neither is pin-compatible, requiring PCB redesign.
Availability
LM2575-3.3YWM is available at Aetrix Electronics and suitable for industrial automation, medical handheld devices, and automotive body electronics requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LM2575-3.3YWM 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 simple, robust buck regulator family targeting cost-sensitive industrial and embedded systems where reliability, minimal external components, and wide input range outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2575-3.3YWM?
The absolute maximum input voltage for LM2575-3.3YWM is 45V, but the recommended operating range is 4V to 40V. Exceeding 40V may trigger internal protection or reduce long-term reliability. The device sustains full 1A output capability across this entire range, making it suitable for 24V industrial buses with transient overvoltage tolerance.
Does LM2575-3.3YWM require an external feedback resistor network?
No, LM2575-3.3YWM does not require external feedback resistors. It is a fixed-output variant with internal resistor division calibrated to deliver 3.3V ±3%. The FB pin is internally connected and inaccessible - unlike adjustable versions such as LM2575, which require external R1/R2.
Can LM2575-3.3YWM be used in a negative-output (inverting) configuration?
Yes, LM2575-3.3YWM can be configured as a positive-to-negative inverting buck-boost converter per Micrel Application Note AN-8. This requires repositioning the inductor and diode, using the IC's ground pin as the negative output reference, and ensuring the input source is floating relative to system ground - a valid topology for generating –3.3V rails.
What is the thermal resistance (θJA) of LM2575-3.3YWM in its SOIC-24 package?
The junction-to-ambient thermal resistance (θJA) for LM2575-3.3YWM in the 24-pin wide SOIC package is 100°C/W, measured with approximately 1 square inch of PCB copper surrounding the leads. This value assumes no additional heatsinking; adding copper area or thermal vias lowers effective θJA and improves power handling.
Is LM2575-3.3YWM RoHS compliant?
Yes, LM2575-3.3YWM is RoHS compliant with the "high-melting solder" exemption, as confirmed in the Micrel ordering information table. It meets EU Directive 2011/65/EU requirements for lead-free packaging and restricted substances, supporting environmentally aligned manufacturing processes.
LM2575-3.3YWM 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):
- 3.3V
- 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
LM2575-3.3YWM FAQ
1.How can I place an order for LM2575-3.3YWM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-3.3YWM 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 LM2575-3.3YWM reliable?
The price and inventory of LM2575-3.3YWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-3.3YWM is usually 5 days.
3.What payment methods are accepted for LM2575-3.3YWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-3.3YWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-3.3YWM?
LM2575-3.3YWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-3.3YWM 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 LM2575-3.3YWM?
For technical support, including LM2575-3.3YWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-3.3YWM requirements.
6.How does Aetrix verify that LM2575-3.3YWM is sourced from the original manufacturer or authorized distributors?
All LM2575-3.3YWM 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 LM2575-3.3YWM meets industry standards.
7.What is the process for return or replacement of LM2575-3.3YWM?
All LM2575-3.3YWM units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-3.3YWM, 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 LM2575-3.3YWM part is unused and in its original packaging.
Return procedure for LM2575-3.3YWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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