My Inquiry
My Account
Microchip Technology LM2575YWM
- Part No.:
- LM2575YWM
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575YWM.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575YWM from Micrel is a monolithic 52 kHz fixed-frequency step-down (buck) switching regulator IC in 24-pin wide SOIC package, delivering guaranteed 1 A output current with ±3% output voltage accuracy (for fixed-output variants), 4 V to 40 V input range, and integrated thermal shutdown and cycle-by-cycle current limiting. It serves as a high-efficiency replacement for linear regulators in industrial power supplies and embedded DC-DC conversion.
For engineers reviewing the LM2575YWM datasheet, LM2575YWM pinout, LM2575YWM application, or LM2575YWM equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional differences, and supply-chain support details specific to the LM2575YWM variant.
Technical Context
The LM2575YWM integrates a 52 kHz oscillator, fixed-gain error amplifier, bandgap reference (1.23 V), PWM comparator, and 1 A internal NPN switch with saturation voltage ≤1.2 V at 1 A. Its feedback loop uses external resistor dividers for adjustable versions or internal resistors for fixed outputs - the YWM suffix denotes RoHS-compliant 24-pin wide SOIC packaging with –40°C to +85°C operating range.
Thermal shutdown activates at TJ ≥150°C; current limit triggers at peak switch current ≥1.7 A (min); standby quiescent current is ≤200 µA when ON/OFF pin is high. The device requires only four external components (inductor, catch diode, input/output capacitors) and supports simple layout with single-point grounding per Micrel's recommended PCB guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1 A continuous load capability - enables direct replacement of linear regulators without heatsink in many 5 V/12 V applications. |
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial rails including 24 V nominal systems with transient tolerance. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, standard 330 µH inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Feedback Reference | 1.23 V ±2% - sets output voltage via external resistor divider; enables precise adjustable regulation from 1.23 V to 37 V. |
| Efficiency | Up to 88% at 12 V out / 1 A (VIN = 25 V) - significantly reduces power loss and thermal management burden vs. linear regulators. |
| Quiescent Current | <10 mA active, ≤200 µA standby - allows low-power system sleep modes without disabling upstream supply. |
| Protection Features | Integrated cycle-by-cycle current limiting and thermal shutdown - eliminates need for external fault-handling circuitry. |
Pinout & Package
LM2575YWM is housed in a 24-pin wide SOIC (WM) package with exposed thermal pad (pin 13 connected to GND). Pin pitch is 1.27 mm; body width is 7.5 mm; total length is 15.4 mm. Thermal resistance θJA is 100°C/W with ~1 in² PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16, 22, 23 | VIN | Main input supply connection (4–40 V); multiple pins reduce trace resistance and improve thermal path. |
| 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 17, 18, 19, 20, 21, 24 | GND / PWR GND / SIG GND | Dedicated ground returns for power switch, error amp, and logic - separation minimizes noise coupling into feedback path. |
| 2 | OUT | Switch node output - connects to inductor and catch diode anode; high dI/dt path requiring short, wide traces. |
| 13 | FB | Feedback input - senses output voltage via resistor divider; high-impedance (50 nA bias) for minimal loading error. |
| 24 | ON/OFF | Logic-level enable/disable control - TTL-compatible; <10 µA leakage ensures reliable turn-off when pulled low. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 52 kHz switching frequency | Enables predictable EMI filtering and consistent inductor selection across designs without frequency trimming. |
| Internal compensation network | Eliminates need for external compensation components - reduces BOM count and layout sensitivity. |
| 1.23 V precision bandgap reference | Provides stable feedback threshold for accurate output regulation across temperature and line/load variations. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and restarts after cooldown - prevents latch-up during overload transients. |
| Low standby current (≤200 µA) | Supports battery-backed or energy-sensitive systems where regulator must remain connected but inactive. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Converting 24 V rail to 5 V for PLC I/O modules operating in ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5 V/1 A output with built-in overcurrent and thermal protection. Use Value: Eliminates need for external current-sense or thermal monitoring circuits while maintaining >80% efficiency at full load. |
Use Scenario: Generating 5 V intermediate rail from 12 V main supply to feed low-noise LDOs powering microcontroller cores. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing heat dissipation before final LDO stage. Use Value: Cuts total power loss by ~65% versus direct 12 V → 3.3 V linear regulation, enabling smaller PCB footprint. |
| On-Card DC-DC Conversion | Inverting Buck-Boost Converter |
|
Use Scenario: Local 12 V generation on a motor control board powered from 36 V battery input. IC Role / Device Role / Timing Role: Standalone buck converter with minimal external components (1 inductor, 1 diode, 2 caps). Use Value: Achieves full 1 A output using only standard off-the-shelf 330 µH inductor and MBR360 Schottky diode. |
Use Scenario: Generating –5 V from +12 V supply for op-amp biasing in analog sensor signal conditioning. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external component set as buck mode. Use Value: Delivers regulated negative output without requiring dedicated inverting controller IC or transformer. |
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, fixed 5 V output, no ON/OFF pin, θJA = 65°C/W (no heatsink needed at 1 A/25°C ambient). | Preferred for high-power, through-hole prototyping or heatsink-mountable designs; lacks enable control. | Select LM2575T-5.0 when board space allows TO-220 mounting and enable functionality is unnecessary. |
| LM2596S-5.0 | Higher 150 kHz switching frequency, 3 A rating, adjustable/fixed options, different pinout and compensation requirements. | Better suited for compact layouts needing higher current or tighter ripple; requires re-optimization of LC filter. | Choose LM2596S-5.0 only if 3 A output or smaller inductor size justifies redesign effort and layout changes. |
Compared with LM2575YWM, LM2575T-5.0 offers superior thermal performance in open-frame environments but sacrifices enable control and surface-mount compatibility; LM2596S-5.0 delivers higher current and frequency but introduces new stability and layout constraints not present in the proven 52 kHz LM2575 architecture.
Availability
LM2575YWM is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2575YWM 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 products emphasized robustness, ease of use, and industrial-grade reliability.
The LM2575YWM belongs to Micrel's legacy buck regulator product line designed for cost-sensitive, high-reliability industrial and embedded applications where simplicity, thermal resilience, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2575YWM?
The absolute maximum input voltage for LM2575YWM is 45 V, but the recommended operating range is 4 V to 40 V. Exceeding 40 V continuously risks violating safe operating area limits, especially under high ambient temperature or full-load conditions. The device's internal switch saturation voltage and thermal design assume operation within this 40 V ceiling.
Does LM2575YWM require an external diode, and what type is recommended?
Yes, LM2575YWM requires an external catch diode connected between the OUT pin and GND. Micrel specifies Schottky diodes such as MBR360 (3 A, 60 V) due to their low forward voltage (≤0.55 V) and fast recovery - minimizing conduction loss and preventing reverse recovery spikes that degrade efficiency and EMI.
Can LM2575YWM be used in adjustable-output configurations?
Yes, LM2575YWM is the adjustable version of the LM2575 family. Its FB pin accepts a resistor divider to set output voltage from 1.23 V to 37 V. Fixed-output variants (e.g., LM2575YWM-5.0) exist separately; the base LM2575YWM part number denotes the adjustable variant with 1.23 V reference and no internal feedback resistors.
What is the thermal resistance (θJA) of LM2575YWM, and how does it affect layout?
The LM2575YWM has θJA = 100°C/W with approximately 1 in² of PCB copper surrounding the leads. This means a 1 A load at 40 V input can raise junction temperature by ~100°C above ambient - necessitating adequate copper pour, thermal vias under the exposed pad (pin 13), and avoidance of enclosed enclosures. Layout must follow Micrel's single-point grounding recommendation to prevent ground bounce.
Is LM2575YWM pin-compatible with other LM2575 package variants like TO-220 or DIP?
No, LM2575YWM (24-pin wide SOIC) is not pin-compatible with TO-220 (5-pin) or DIP (16-pin) variants. Pin count, pin assignment, and thermal pad configuration differ fundamentally. Migration requires full schematic and layout revision - especially for GND, VIN, and FB routing - and cannot be treated as a drop-in replacement.
LM2575YWM 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:
- 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 FAQ
1.How can I place an order for LM2575YWM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575YWM 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 reliable?
The price and inventory of LM2575YWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575YWM is usually 5 days.
3.What payment methods are accepted for LM2575YWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575YWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575YWM?
LM2575YWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575YWM 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?
For technical support, including LM2575YWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575YWM requirements.
6.How does Aetrix verify that LM2575YWM is sourced from the original manufacturer or authorized distributors?
All LM2575YWM 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 meets industry standards.
7.What is the process for return or replacement of LM2575YWM?
All LM2575YWM units undergo pre-shipment inspection (PSI). If there is an issue with LM2575YWM, 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 part is unused and in its original packaging.
Return procedure for LM2575YWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575YWM Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
