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Microchip Technology LM2575-12YN
- Part No.:
- LM2575-12YN
- Manufacturer:
- Microchip Technology
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575-12YN.pdf
- Description:
- IC REG BUCK 12V 1A 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,470
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Product details
Overview
LM2575-12YN from Micrel Inc. is a fixed-output 12V, 1A step-down (buck) switching regulator in TO-220 package with 52kHz fixed-frequency operation, ±3% output voltage tolerance over line/load, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575-12YN datasheet, LM2575-12YN pinout, LM2575-12YN application, or LM2575-12YN equivalent, key selection criteria include input voltage range (4–40V), guaranteed 1A output, 88% typical efficiency at 12V/1A, ON/OFF control with <200µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575-12YN integrates a 52kHz oscillator, error amplifier, bandgap reference (1.23V), PWM comparator, and 1A NPN switch with saturation voltage ≤1.4V. Its feedback loop is internally compensated and configured for fixed 12V output via internal resistor divider - no external FB network required.
It features cycle-by-cycle current limiting (1.3–3.2A peak), thermal shutdown activation at ~150°C junction temperature, and ON/OFF logic control with VIH ≥2.4V and VIL ≤0.8V. Standby quiescent current is guaranteed ≤200µA when ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±3% over 0.2–1A load and 15–40V input - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Max Output Current | 1A continuous - supports moderate-power loads such as microcontrollers, sensors, or interface ICs without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial, automotive, or battery-derived supplies including 24V nominal systems. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) and simplifies EMI filtering design. |
| Efficiency | 88% typical at VIN=25V, VOUT=12V, IOUT=1A - reduces thermal load vs. linear regulators and often eliminates need for heatsink. |
| Standby Current | <200µA - enables low-power sleep modes in battery-backed or energy-conscious systems via ON/OFF pin control. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents device failure during overload, short-circuit, or ambient overheating. |
Pinout & Package
LM2575-12YN is housed in a 5-pin TO-220 package with exposed tab (pin 3) electrically connected to GND. The package provides low thermal resistance (θJA = 65°C/W, no heatsink; 45°C/W with 4 in² copper) and vertical mounting capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Unregulated input supply connection | Accepts 4–40V DC; requires ≥100µF bulk capacitance close to pin for stability and EMI suppression. |
| 2: OUTPUT | Switched output node | Drives external catch diode (e.g., MBR360) and inductor; peak voltage reaches VIN during switch-off. |
| 3: GND | Power and signal ground reference | Common return for input cap, output cap, and feedback path; tab is GND - must be thermally and electrically tied to PCB ground plane. |
| 4: FEEDBACK | Internal voltage sense input | Internally connected to 12V divider - left unconnected; not used in fixed-output variants. |
| 5: ON/OFF | Logic-controlled enable/disable input | Drive ≥2.4V to enable; ≤0.8V to disable (ISTBY ≤200µA); open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external resistor divider - reduces BOM count, layout area, and calibration drift risk. |
| 52kHz fixed-frequency oscillator | Enables predictable EMI spectrum and consistent inductor sizing across designs using industry-standard 330µH parts. |
| Integrated current limiting & thermal shutdown | Provides autonomous fault recovery without external sensing or protection ICs - improves system reliability. |
| ON/OFF logic control | Supports system-level power sequencing and low-power sleep states with sub-200µA quiescent draw. |
| Only 4 external components required | Reduces design time and bill-of-materials: input cap, output cap, inductor, and catch diode - no compensation network needed. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
|
Use Scenario: Converting 24V factory bus to stable 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 12V at up to 1A with line/load regulation ≤±3%. Use Value: Replaces linear regulators to eliminate heat sink requirements and reduce board space by >50% in DIN-rail mounted enclosures. |
Use Scenario: Providing clean 12V power to ARM-based industrial gateways operating in extended temperature environments. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with thermal shutdown protecting against enclosure overheating during summer operation. Use Value: Maintains regulation across –40°C to +85°C ambient while sustaining 88% efficiency at full load - minimizing thermal derating. |
| Automotive Subsystem Supply | Test Equipment Power Module |
|
Use Scenario: Deriving 12V from vehicle battery (9–16V nominal, up to 40V load dump) for infotainment display backlight drivers. IC Role / Device Role / Timing Role: Input-tolerant buck regulator with built-in current limit and thermal protection for transient-heavy automotive environments. Use Value: Withstands 40V transients without latch-up and recovers autonomously after overtemperature events - no manual reset required. |
Use Scenario: Generating 12V for benchtop oscilloscope auxiliary rails where low-noise and fast transient response are critical. IC Role / Device Role / Timing Role: High-efficiency switching regulator with 100µs load transient recovery (1A ↔ 0.5A) and minimal output ripple. Use Value: Delivers stable 12V under dynamic loads while maintaining <100mV output deviation - avoids false triggering in sensitive analog circuits. |
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 (D²PAK) package with lower θJA (45°C/W with 1 in² copper) and surface-mount footprint. | Better thermal performance in compact SMT layouts; requires reflow-compatible PCB design and no through-hole mounting. | Select LM2575-12WU for space-constrained, high-density boards where thermal management favors SMT over TO-220. |
| LM2576-12 | Higher 3A output rating, 52kHz frequency, but requires external compensation and has higher quiescent current (5mA vs. <200µA). | Used where future load growth or parallel operation is anticipated; less suitable for ultra-low-power standby modes. | Choose LM2576-12 only if >1A output headroom or enhanced ruggedness (e.g., higher current limit) is required - otherwise LM2575-12YN offers simpler design and lower IQ. |
Compared with LM2575-12WU, the LM2575-12YN offers identical regulation and protection but requires through-hole assembly and delivers slightly higher thermal resistance. Against LM2576-12, it trades output current headroom for lower standby power and reduced external component count - ideal for cost- and power-sensitive 1A applications.
Availability
LM2575-12YN is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, and automotive subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM2575-12YN 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 power management, analog, and mixed-signal ICs before its acquisition by Microchip Technology in 2015. Its legacy products 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 programmability.
FAQ
What is the maximum input voltage rating for the LM2575-12YN?
The LM2575-12YN has an absolute maximum input voltage of 45V, with recommended operating range from 4V to 40V. Exceeding 40V continuously may trigger internal protection or degrade long-term reliability; for 40V+ transients (e.g., automotive load dump), external clamping is advised. The LM2575-12YN maintains regulation and protection integrity within its specified 4–40V window.
Does the LM2575-12YN require external feedback resistors to set the output voltage?
No - the LM2575-12YN is a fixed-output variant with internal resistor divider configured for 12V. Pin 4 (FEEDBACK) is unused and must be left unconnected. This eliminates tuning errors and component drift, distinguishing it from adjustable versions like LM2575 or LM2575-ADJ. The LM2575-12YN delivers factory-trimmed 12V ±3% without external components on the FB pin.
Can the LM2575-12YN be used in negative-output (inverting) configurations?
Yes - the LM2575-12YN can be configured as a positive-to-negative inverting buck-boost converter per Micrel Application Note AN-5. In this topology, the IC regulates the magnitude of the negative output (e.g., –12V) using the same internal 12V reference. However, the LM2575-12YN itself remains a positive-output device; inversion requires external component reconfiguration, not internal capability.
What thermal performance can be expected from the LM2575-12YN in a standard TO-220 mount?
In a vertical TO-220 mount with 1/2" leads in socket or minimal PCB copper, the LM2575-12YN has θJA = 65°C/W. With ~4 in² of copper surrounding leads, θJA drops to 45°C/W. At 1A/12V output (88% efficient), power dissipation is ~1.6W - resulting in ~70°C rise above ambient with no heatsink. The LM2575-12YN's thermal shutdown activates at ~150°C junction temperature, providing robust margin.
Is the LM2575-12YN RoHS compliant and lead-free?
Yes - the "Y" suffix in LM2575-12YN indicates Pb-free/RoHS-compliant packaging per Micrel's ordering information. It uses lead-free terminations and meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for standard reflow profiles. The LM2575-12YN is suitable for modern environmentally regulated manufacturing without exemption requests.
LM2575-12YN 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:
- 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:
- Through Hole
- Supplier Device Package:
- 16-DIP
LM2575-12YN FAQ
1.How can I place an order for LM2575-12YN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12YN 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 LM2575-12YN reliable?
The price and inventory of LM2575-12YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12YN is usually 5 days.
3.What payment methods are accepted for LM2575-12YN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-12YN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-12YN?
LM2575-12YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12YN 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 LM2575-12YN?
For technical support, including LM2575-12YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12YN requirements.
6.How does Aetrix verify that LM2575-12YN is sourced from the original manufacturer or authorized distributors?
All LM2575-12YN 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 LM2575-12YN meets industry standards.
7.What is the process for return or replacement of LM2575-12YN?
All LM2575-12YN units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12YN, 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 LM2575-12YN part is unused and in its original packaging.
Return procedure for LM2575-12YN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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