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onsemi LM2575T-12G
- Part No.:
- LM2575T-12G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-12G.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,533
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Product details
Overview
LM2575T-12G from onsemi is a monolithic step-down (buck) switching regulator IC delivering a fixed 12 V output at up to 1.0 A, with ±4% output voltage tolerance over line and load, 52 kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 15 V to 40 V input and is widely used in industrial power supplies and battery charger pre-regulators.
For engineers reviewing the LM2575T-12G datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-220 package with heatsink-connected ground pin, 1.0 A guaranteed output current, 88% typical efficiency at 15 VIN/1.0 A, and TTL-compatible ON/OFF control with 80 µA standby current.
Technical Context
The LM2575T-12G integrates a 1.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and protection circuitry including thermal shutdown and current limiting. Its fixed-output architecture eliminates external feedback resistors, simplifying design versus adjustable versions.
It uses voltage-mode PWM control with a fixed 52 kHz switching frequency and supports external shutdown via Pin 5 (ON/OFF), which pulls quiescent current down to 80 µA typical when driven high. The internal switch exhibits 1.0 V typical saturation voltage at 25°C and 1.3 V max over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Max Output Current | 1.0 A continuous - sufficient to power microcontrollers, sensors, or small motor drivers without external pass devices. |
| Input Voltage Range | 15 V to 40 V DC - compatible with 24 V industrial buses and automotive battery systems with transient headroom. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, standard-value inductors (e.g., 330 µH) and reduces EMI filtering complexity vs. higher-frequency converters. |
| Efficiency | 88% typical at 15 VIN, 1.0 A load - significantly reduces thermal load versus linear regulators, often eliminating need for heatsink. |
| Standby Current | 80 µA typical at 25°C - enables low-power system sleep modes while retaining fast wake-up capability. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or elevated ambient conditions. |
Pinout & Package
LM2575T-12G is housed in a TO-220 package (Case 314D), with the metal tab (heatsink surface) internally connected to Pin 3 (GND). This configuration requires isolation from chassis ground unless GND is chassis-referenced.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 15–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 12 V; PCB copper area must be minimized to reduce EMI coupling into sensitive circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors and feedback network; metal tab is electrically tied to this pin. |
| 4 - Feedback | Regulation sense input | Internally connected to 12 V divider; unused in fixed-output version - must be left open or grounded per datasheet guidance. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible: ≤1.2 V = ON, ≥2.2 V = OFF; draws only 80 µA in shutdown, enabling low-power system control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external resistor network - reduces BOM count, layout sensitivity, and temperature drift vs. adjustable variants. |
| 52 kHz fixed oscillator | Enables predictable EMI spectrum and compatibility with off-the-shelf 330 µH inductors optimized for this frequency. |
| Integrated thermal shutdown | Automatically disables switching if junction temperature exceeds ~150°C - protects against sustained overload or poor heatsinking. |
| TTL shutdown interface | Allows direct connection to microcontroller GPIO without level-shifting; 80 µA standby current supports energy-efficient power sequencing. |
| Current-limit protection | Peak current limit of 1.7–3.0 A (25°C) prevents destructive inductor saturation during startup or output shorts. |
Applications
| Industrial Power Supply | Battery Charger Pre-regulator |
|---|---|
|
Use Scenario: Providing clean 12 V rail for PLC I/O modules operating from 24 V factory bus with voltage transients. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V nominal input to stable 12 V output with high efficiency and fault resilience. Use Value: 88% efficiency minimizes heat buildup in enclosed cabinets; thermal shutdown prevents field failures during brownouts or wiring faults. |
Use Scenario: Generating 12 V intermediate bus for multi-stage Li-ion charger controlling constant-current/constant-voltage phases. IC Role / Device Role / Timing Role: Pre-regulator stage reducing wide-input battery voltage (e.g., 18–36 V) to fixed 12 V before linear post-regulation. Use Value: High efficiency preserves battery runtime; ON/OFF pin enables precise charge-state sequencing via MCU control. |
| On-Card DC-DC Conversion | Positive-to-Negative Converter (Buck-Boost) |
|
Use Scenario: Local 12 V generation on a motor control board where space prohibits external AC-DC adapter. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing bulky linear regulators or external modules. Use Value: TO-220 package allows direct mounting to metal enclosure for passive cooling; only 4 external components required. |
Use Scenario: Deriving –12 V rail from existing +12 V supply for op-amp biasing or sensor signal conditioning. IC Role / Device Role / Timing Role: Reconfigured as inverting buck-boost using standard external diode and inductor per datasheet Figure 1. Use Value: Leverages same proven topology and protection features - no redesign needed beyond component reorientation and polarity reversal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVT-12 | Wider input range (4.75–60 V); higher thermal resistance (RJA = 70°C/W); same pinout and electrical specs. | Suitable for 48 V telecom or automotive cold-crank scenarios where input may dip below 15 V or surge above 40 V. | Select when input voltage exceeds 40 V or drops below 15 V; verify heatsink adequacy due to higher RJA. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz); smaller external components; no integrated catch diode; different pinout. | Preferred for space-constrained designs requiring compact 12 V rails, but requires redesign of magnetics and layout. | Choose for miniaturized applications where PCB area is critical; not drop-in - new layout and component selection required. |
Compared with LM2575T-12G, LM2575HVT-12 extends input voltage range at the cost of slightly reduced thermal performance, while MP1584EN-LF-Z trades simplicity and ruggedness for size reduction and higher-frequency operation - necessitating full schematic and layout revision.
Availability
LM2575T-12G is available at Aetrix Electronics and suitable for industrial power supplies, battery charger pre-regulators, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575T-12G 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a robust, low-component-count buck regulator family targeting cost-sensitive industrial and consumer power applications where reliability, thermal resilience, and ease of implementation are prioritized over ultra-high frequency or ultra-small footprint.
FAQ
What is the maximum input voltage rating for LM2575T-12G?
The absolute maximum input voltage for LM2575T-12G is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating safe operating area limits, especially under high-temperature conditions. The LM2575T-12G is specified for reliable operation from 15 V to 40 V input, with optimal efficiency observed between 18 V and 28 V.
Does LM2575T-12G require an external catch diode, and what type is recommended?
Yes, LM2575T-12G requires an external Schottky catch diode such as the 1N5819 (30 V, 1 A) or MBR130L. The diode conducts during the switch "off" period to maintain load current continuity. A Schottky type is mandatory due to its low forward voltage (~0.4 V) and fast recovery - standard PN diodes cause excessive losses and potential instability. Datasheet Figure 1 specifies 1N5819 for 12 V versions.
Can LM2575T-12G be used in a negative-output (inverting) configuration?
Yes, LM2575T-12G can be configured as a positive-to-negative buck-boost converter per datasheet Application section and Figure 1. In this topology, the IC regulates the magnitude of the negative output (e.g., –12 V) referenced to system ground. Component polarity and grounding must follow the exact schematic shown - the IC itself remains powered from the positive input rail, and Pin 2 becomes the switched node driving the inductor to ground.
What is the thermal resistance and heatsinking requirement for LM2575T-12G at full 1.0 A load?
LM2575T-12G in TO-220 (Case 314D) has RJC = 5.0°C/W and RJA = 65°C/W. At 1.0 A and 24 VIN, power dissipation is ~12 W; junction rise above ambient would exceed 150°C without heatsinking. A 10°C/W heatsink (with thermal interface) keeps TJ < 125°C at 25°C ambient. The metal tab (Pin 3) must be electrically isolated unless GND is chassis-referenced.
Is LM2575T-12G still in active production, and what is its lifecycle status?
LM2575T-12G remains actively manufactured and stocked by onsemi, with no discontinuance notice issued as of the March 2025 Rev. 14 datasheet. It is designated as a mature, long-lifecycle product intended for industrial applications. Aetrix Electronics maintains strategic inventory and offers extended lifecycle support documentation, including obsolescence monitoring and last-time-buy planning for LM2575T-12G.
LM2575T-12G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- 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:
- TO-220-5
LM2575T-12G FAQ
1.How can I place an order for LM2575T-12G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-12G 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 LM2575T-12G reliable?
The price and inventory of LM2575T-12G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-12G is usually 5 days.
3.What payment methods are accepted for LM2575T-12G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-12G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-12G?
LM2575T-12G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-12G 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 LM2575T-12G?
For technical support, including LM2575T-12G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-12G requirements.
6.How does Aetrix verify that LM2575T-12G is sourced from the original manufacturer or authorized distributors?
All LM2575T-12G 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 LM2575T-12G meets industry standards.
7.What is the process for return or replacement of LM2575T-12G?
All LM2575T-12G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-12G, 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 LM2575T-12G part is unused and in its original packaging.
Return procedure for LM2575T-12G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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