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onsemi LM2575T-015
- Part No.:
- LM2575T-015
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-015.pdf
- Description:
- IC REG BUCK 15V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
LM2575T-015 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 15 V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and wide 4.75 V to 40 V input range. It integrates a 1.0 A NPN switch, error amplifier, oscillator, and thermal/current protection - used in battery chargers, industrial power supplies, and embedded DC-DC conversion where efficiency exceeds linear regulators.
For engineers reviewing the LM2575T-015 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A output capability, fixed 15 V output without external feedback resistors, TO-220-5 package with heatsink-connected ground pin, and built-in cycle-by-cycle current limiting and thermal shutdown.
Technical Context
The LM2575T-015 implements a voltage-mode controlled buck converter with a fixed 52 kHz oscillator and internal 1.23 V bandgap reference. Its output stage uses an integrated NPN transistor switch with typical 1.0 V saturation voltage at 1.0 A, enabling high-efficiency operation across 4.75–40 V input while maintaining ±4% output regulation under full load and temperature.
It features TTL-compatible ON/OFF control (1.4 V threshold), 80 µA standby quiescent current when disabled, and self-protecting behavior: under overload, oscillator frequency drops to ~18 kHz and duty cycle reduces to ~2%, lowering average dissipation without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over −40°C to +125°C, 0.2–1.0 A load, and 18–40 V input - eliminates need for external feedback divider. |
| Output Current | Guaranteed 1.0 A continuous - supports medium-power loads without external pass devices or heatsinking in many cases. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 12 V/24 V industrial rails, automotive battery transients, and unregulated wall adapters. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, standard inductors (e.g., 330 µH) and simplifies EMI filtering. |
| Efficiency | 88% typical at 18 V input, 1.0 A load - significantly reduces thermal load vs. linear regulators, often eliminating heatsinks. |
| Protection Features | Cycle-by-cycle current limiting (1.4–3.2 A peak), thermal shutdown, and 80 µA standby current - ensures robust fault recovery without external circuitry. |
| Quiescent Current | 5.0–9.0 mA active, 15–200 µA in shutdown - suitable for low-power standby modes in battery-backed systems. |
Pinout & Package
LM2575T-015 is housed in a TO-220-5 package (Case 314D), with Pin 3 (GND) electrically connected to the metal heatsink tab for low-impedance thermal and grounding path. The package requires no isolation pad when mounted to a heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 15 V; PCB copper area must be minimized to reduce EMI coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and heatsink - must be single-point grounded per layout guidelines. |
| 4 - Feedback | Regulation sense input | Internally tied to 15 V output via precision resistor divider; not accessible externally in fixed-output versions. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible: ≤1.2 V = ON, ≥2.2 V = OFF; draws only 15–30 µA when disabled - enables low-power system sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors and associated layout sensitivity - reduces BOM count and improves long-term stability. |
| Integrated 1.0 A NPN switch | Enables complete buck regulator with only 4 external components (diode, inductor, input/output caps) - accelerates design and lowers footprint. |
| 52 kHz fixed-frequency operation | Allows use of off-the-shelf, low-cost 330 µH inductors and simplifies EMI compliance testing versus variable-frequency alternatives. |
| Thermal shutdown + current limit | Self-protecting under short-circuit or overload - prevents device destruction and enables automatic recovery without system-level intervention. |
| TTL shutdown with 80 µA standby | Supports microcontroller-driven power sequencing and battery-aware sleep states - critical for portable and energy-sensitive applications. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
|
Use Scenario: Converting 24 V rail to stable 15 V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 15 V bias for analog front-ends and digital logic. Use Value: Delivers 1.0 A at 88% efficiency - reduces heat buildup in enclosed enclosures and avoids forced-air cooling requirements. |
Use Scenario: Pre-regulating variable 18–36 V automotive or lead-acid battery voltage to fixed 15 V for charging circuitry in smart battery packs. IC Role / Device Role / Timing Role: Constant-voltage pre-regulator upstream of linear charge controllers - handles wide input swings and transient surges. Use Value: Withstands 40 V max input and includes thermal shutdown - protects downstream charge ICs during battery connection faults or overvoltage events. |
| On-Card DC-DC Conversion | Negative Voltage Generator (Buck-Boost) |
|
Use Scenario: Generating local 15 V rail on a dense PCB for op-amp biasing, ADC references, or relay drivers in telecom line cards. IC Role / Device Role / Timing Role: Compact, self-contained buck converter minimizing board space and simplifying layout with minimal external parts. Use Value: TO-220-5 package with heatsink tab allows direct mounting to chassis - achieves thermal performance comparable to SMT solutions with easier assembly. |
Use Scenario: Configured as inverting buck-boost to generate −15 V from +24 V supply for dual-rail op-amps in test equipment. IC Role / Device Role / Timing Role: Core switching element in non-isolated inverting topology - leverages fixed 15 V internal reference for predictable gain. Use Value: Fixed 15 V feedback ratio enables accurate −15 V output without trimming; 52 kHz frequency ensures stable loop response with standard magnetics. |
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-15 | Higher 60 V max input rating (vs. 40 V); otherwise identical pinout, specs, and 15 V output. | Suitable for 48 V telecom or PoE-powered systems where input transients exceed 40 V. | Select when input voltage may exceed 40 V - same PCB layout but improved surge margin. |
| LM2596T-15 | 3.0 A output, 150 kHz switching, adjustable feedback (requires external resistors even for 15 V), different pinout. | Higher current and frequency support smaller magnetics but require redesign of feedback network and layout. | Choose for >1.0 A loads or tighter ripple/noise budgets - not drop-in; requires new schematic and layout. |
Compared with LM2575HVT-15, the LM2575T-015 offers lower cost and proven reliability in 40 V-class systems; compared with LM2596T-15, it provides simpler implementation and better thermal behavior at 1.0 A, though with lower current headroom and larger inductor size.
Availability
LM2575T-015 is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, on-card DC-DC conversion, and negative voltage generator designs requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LM2575T-015 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 supplier focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.
The LM2575 series was designed for simple, high-efficiency step-down conversion in cost-sensitive industrial, automotive, and consumer applications - prioritizing minimal external components, robust protection, and ease of layout.
FAQ
What is the maximum input voltage rating for LM2575T-015?
The LM2575T-015 has an absolute maximum input voltage of 45 V, with recommended operating maximum of 40 V. Exceeding 40 V risks violating the specified operating ratings and may degrade long-term reliability. The device includes internal protection, but sustained operation above 40 V is not guaranteed per datasheet specifications.
Does LM2575T-015 require external feedback resistors to set its output voltage?
No - the LM2575T-015 is a fixed-output variant with internal resistor divider configured for 15 V. Unlike the adjustable LM2575-ADJ, it does not use external R1/R2 resistors; Pin 4 (Feedback) is internally connected and not user-accessible for programming.
Can LM2575T-015 be used in a negative-output (inverting) configuration?
Yes - the LM2575T-015 can be configured as a buck-boost inverter to generate −15 V from a positive input. The datasheet explicitly lists "Positive to Negative Converters (Buck-Boost)" as an application, and the fixed 15 V reference enables predictable inversion ratio without external feedback tuning.
What thermal considerations apply to LM2575T-015 in TO-220-5 package?
The LM2575T-015 TO-220-5 package has RθJC = 5.0°C/W and RθJA = 65°C/W. With 88% efficiency at 18 V/1.0 A, power dissipation is ~2 W - requiring either a modest heatsink or careful PCB copper pour on Pin 3 (GND/heatsink tab) to maintain junction temperature below 125°C under worst-case ambient.
Is LM2575T-015 RoHS compliant and halogen-free?
Yes - the LM2575T-015 is a Pb-free device with Moisture Sensitivity Level (MSL) 1, and meets RoHS Directive 2011/65/EU. The datasheet confirms "These are Pb−Free Devices" and specifies halogen-free material content per industry standards.
LM2575T-015 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):
- 15V
- 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-015 FAQ
1.How can I place an order for LM2575T-015 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-015 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-015 reliable?
The price and inventory of LM2575T-015 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-015 is usually 5 days.
3.What payment methods are accepted for LM2575T-015?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-015 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-015?
LM2575T-015 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-015 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-015?
For technical support, including LM2575T-015 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-015 requirements.
6.How does Aetrix verify that LM2575T-015 is sourced from the original manufacturer or authorized distributors?
All LM2575T-015 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-015 meets industry standards.
7.What is the process for return or replacement of LM2575T-015?
All LM2575T-015 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-015, 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-015 part is unused and in its original packaging.
Return procedure for LM2575T-015:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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