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onsemi LM2575T-15G
- Part No.:
- LM2575T-15G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-15G.pdf
- Description:
- IC REG BUCK 15V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,022
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Product details
Overview
LM2575T-15G from onsemi is a monolithic step-down (buck) switching regulator IC delivering fixed 15 V output at up to 1.0 A, with ±4% output voltage tolerance over line and load, 4.75–40 V input range, and 52 kHz internal oscillator frequency. It integrates a 1.0 A power switch, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in industrial power supplies, battery chargers, and embedded DC-DC conversion stages.
For engineers reviewing the LM2575T-15G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The LM2575T-15G implements a voltage-mode controlled buck converter architecture with an internal 52 kHz oscillator, fixed 15 V feedback reference derived from a 1.235 V bandgap, and integrated 1.0 A NPN power switch. Its error amplifier compares feedback voltage against internal reference to adjust duty cycle via PWM comparator and driver stage.
Protection includes cycle-by-cycle current limiting (1.4–3.2 A peak), thermal shutdown (TJ ≥ 150°C), and low-quiescent standby mode (80 µA typical). The device operates across −40°C to +125°C junction temperature and supports simple external component count: only input capacitor, output capacitor, catch diode (e.g., 1N5819), and inductor (e.g., 330 µH) required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full line/load/temperature range - ensures stable rail for analog front-ends or microcontroller peripherals without external feedback resistors. |
| Max Output Current | 1.0 A continuous - sufficient to power FPGA I/O banks, sensor signal chains, or small motor drivers without heatsink under typical conditions. |
| Input Voltage Range | 4.75 V to 40 V - supports wide-input industrial 24 V systems, automotive battery-supplied designs (with transient protection), and universal AC/DC adapter outputs. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current toroidal inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% typical at 18 VIN, 1.0 A, 15 VOUT - minimizes thermal load versus linear regulators; dissipation ~1.8 W enables TO-220 operation without heatsink at moderate ambient. |
| Standby Quiescent Current | 80 µA typical when ON/OFF pin ≥2.4 V - allows low-power system sleep modes while retaining fast wake-up capability (<100 µs). |
| Saturation Voltage | 1.0 V typical at 1.0 A, 25°C - defines minimum dropout: requires ≥16 V input for reliable 15 V output under full load. |
Pinout & Package
LM2575T-15G uses TO-220 package (Case 314D), with heatsink surface electrically connected to Pin 3 (GND). Mounting tab must be isolated from chassis ground unless GND reference is shared.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF/50 V) placed within 5 mm to minimize switching noise coupling. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤1.3 V limits minimum input for regulation; PCB copper area must be minimized to reduce EMI coupling into sensitive circuits. |
| 3 - GND | Circuit ground reference | Common return for input cap, output cap, and feedback network; single-point grounding recommended to avoid ground bounce in high-di/dt paths. |
| 4 - Feedback | Regulation sense node | Internally tied to 15 V divider; not accessible - no external resistor network needed; pin left unconnected in fixed-output variants. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (≥2.4 V) disables regulator, reducing input current to ~80 µA; logic-low (≤1.0 V) enables operation; compatible with microcontroller GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors and layout sensitivity - reduces BOM count and improves long-term output stability vs. adjustable versions. |
| Integrated 1.0 A switch | Removes need for external MOSFET and gate driver - simplifies thermal design and reduces footprint in space-constrained industrial modules. |
| Thermal shutdown + current limit | Self-protecting under overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure during validation or field operation. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filter design using standard off-the-shelf inductors and capacitors - avoids variable-frequency jitter complications. |
| TTL shutdown interface | Direct connection to 3.3 V or 5 V logic without level-shifting - supports system-level power sequencing and low-power sleep states. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
|
Use Scenario: Converts 24 VDC factory bus to stable 15 V for PLC I/O modules and analog sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated 15 V rail with line/load regulation <±0.5% and ripple <150 mVpp. Use Value: Replaces inefficient 7815 linear regulators - cuts board-level heat by >70% and eliminates mandatory heatsinks in enclosed enclosures. |
Use Scenario: Steps down 28 V aircraft battery or 36 V Li-ion pack to 15 V intermediate bus for charging circuitry and fuel gauging ICs. IC Role / Device Role / Timing Role: Pre-regulator before linear post-regulator; handles wide input transients (up to 40 V) while maintaining tight output tolerance. Use Value: Maintains regulation during cold-cranking dips (down to 4.75 V) and load-dump surges - ensures charger controller remains operational. |
| On-Card DC-DC Conversion | Positive-to-Negative Converter |
|
Use Scenario: Generates local 15 V rail on a dense FPGA carrier board where space prohibits external DC-DC modules. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using TO-220 footprint and only four passive components. Use Value: Achieves 88% efficiency at 1 A with <1.0 cm² PCB area - outperforms comparable modules in cost and thermal density. |
Use Scenario: Configured as inverting buck-boost to generate −15 V from +24 V supply for op-amp biasing in precision instrumentation. IC Role / Device Role / Timing Role: Switching controller operating in inverted topology; leverages same 52 kHz timing and protection features. Use Value: Delivers clean, regulated negative rail without requiring dedicated inverting IC - reduces component count and layout complexity. |
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 | Extended input range: 4.75–60 V; otherwise identical pinout, specs, and thermal behavior. | Suitable for 48 V telecom or railway systems where input may exceed 40 V; not required for standard 24 V industrial use. | Select LM2575HVT-15 only if VIN can exceed 40 V; otherwise LM2575T-15G offers optimal cost/performance balance. |
| MP1584EN-LF-Z | Higher frequency (1.5 MHz), smaller external components, but requires external feedback resistors and lacks built-in thermal shutdown latch. | Better suited for ultra-compact designs; less robust in sustained overload due to absence of latched thermal protection. | Choose MP1584EN-LF-Z when board space is critical and thermal management is actively controlled; LM2575T-15G preferred for ruggedized, maintenance-free deployments. |
Compared with LM2575HVT-15, the LM2575T-15G trades 20 V input headroom for lower cost and identical performance in 24 V systems; compared with MP1584EN-LF-Z, it sacrifices PCB area reduction for integrated protection and fixed-output simplicity - making it ideal for reliability-first industrial power rails.
Availability
LM2575T-15G is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575T-15G 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 cost-sensitive, high-reliability buck conversion in industrial, automotive (NCV variant), and embedded systems - prioritizing minimal external components, robust protection, and wide-input operation.
FAQ
What is the maximum input voltage rating for LM2575T-15G?
The absolute maximum input voltage for LM2575T-15G is 45 V, but the recommended operating maximum is 40 V per datasheet specifications. Operation above 40 V risks exceeding safe junction temperature or violating guaranteed performance limits - always include input transient suppression (e.g., TVS diode) if surge conditions exceed 40 V. LM2575T-15G must never be operated continuously at 45 V.
Does LM2575T-15G require external feedback resistors?
No, LM2575T-15G is a fixed-output version with internal resistor divider set for 15 V; Pin 4 (Feedback) is internally connected and must remain unconnected in circuit layout. External resistors are only required for the adjustable LM2575ADJ variant - adding them to LM2575T-15G will disrupt regulation and cause output deviation.
Can LM2575T-15G be used in a negative-output configuration?
Yes, LM2575T-15G can be configured as a positive-to-negative buck-boost converter per Figure 1 in the datasheet, generating −15 V from a positive input. This requires repositioning the inductor and diode, grounding the output capacitor's positive terminal, and referencing feedback to the negative rail - but LM2575T-15G itself remains unchanged and fully functional in this topology.
What thermal considerations apply to LM2575T-15G in TO-220 package?
LM2575T-15G has RθJA = 65°C/W (TO-220, Case 314D). At 1.0 A output and 24 V input, dissipation is ~1.8 W - resulting in ~117°C rise above ambient. A minimum 25 cm² copper pour on the GND-connected tab is recommended; derate output current above 60°C ambient. Heatsink mounting is optional below 500 mA load.
Is LM2575T-15G pin-compatible with other LM2575 fixed-output variants?
Yes, all LM2575 fixed-output versions (3.3 V, 5 V, 12 V, 15 V) share identical TO-220 (T suffix) and D2PAK (D2T suffix) packages, pinout, and electrical interface - allowing direct substitution in existing layouts when only output voltage differs. No PCB changes are required, though inductor and diode ratings should be verified for new input/output conditions.
LM2575T-15G 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-15G FAQ
1.How can I place an order for LM2575T-15G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-15G 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-15G reliable?
The price and inventory of LM2575T-15G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-15G is usually 5 days.
3.What payment methods are accepted for LM2575T-15G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-15G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-15G?
LM2575T-15G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-15G 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-15G?
For technical support, including LM2575T-15G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-15G requirements.
6.How does Aetrix verify that LM2575T-15G is sourced from the original manufacturer or authorized distributors?
All LM2575T-15G 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-15G meets industry standards.
7.What is the process for return or replacement of LM2575T-15G?
All LM2575T-15G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-15G, 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-15G part is unused and in its original packaging.
Return procedure for LM2575T-15G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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