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onsemi LM2575T-012
- Part No.:
- LM2575T-012
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-012.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,337
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Product details
Overview
LM2575T-012 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 12 V output, ±4% tolerance over line and load, 4.75–40 V input range, and 52 kHz internal oscillator frequency - used in industrial power supplies, battery chargers, and embedded DC-DC conversion stages.
For engineers reviewing the LM2575T-012 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A output capability, thermal shutdown protection, TTL-compatible ON/OFF control, and compatibility with standard off-the-shelf inductors (e.g., 330 µH) without requiring external compensation.
Technical Context
The LM2575T-012 integrates a 1.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and cycle-by-cycle current limiting. Its fixed-output architecture eliminates external feedback resistors, simplifying design versus adjustable variants.
It operates in continuous conduction mode with typical efficiency of 88% at 15 V input / 1.0 A load, uses an external catch diode (e.g., 1N5819), and relies on external LC filter components for ripple suppression and stability - no external frequency programming or compensation network required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±4% over −40°C to +125°C junction temperature, 15–40 V input, 0.2–1.0 A load. |
| Output current | Guaranteed 1.0 A DC output with internal current limiting and thermal shutdown protection. |
| Input voltage range | 4.75 V to 40 V DC - supports wide-input industrial and automotive pre-regulation applications. |
| Oscillator frequency | 52 kHz fixed (±10% over temperature) - enables predictable EMI filtering and standard inductor selection. |
| Efficiency | 88% typical at Vin = 15 V, IOUT = 1.0 A - significantly higher than linear regulators, reducing heatsink requirements. |
| Quiescent current | 5.0–9.0 mA operating; 15–200 µA standby when ON/OFF pin ≥2.4 V - enables low-power shutdown mode. |
| Saturation voltage | 1.0–1.3 V at 1.0 A - defines minimum dropout and impacts conduction loss and thermal design. |
Pinout & Package
LM2575T-012 is housed in a TO-220-5 (Case 314D) package with exposed heatsink surface electrically connected to Pin 3 (GND). The package supports direct mounting to heatsinks and meets MSL Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local 100 µF/50 V input 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 circuitry. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, inductor, and catch diode; single-point grounding recommended. |
| 4 - Feedback | Internal voltage sense node | Internally tied to 12 V divider - not accessible; unused in fixed-output versions (no external resistor connection). |
| 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. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors - reduces BOM count and layout sensitivity vs. adjustable versions. |
| Integrated 1.0 A switch | Reduces external component count; avoids discrete transistor selection, gate drive, and protection design. |
| Thermal shutdown + current limit | Self-protecting under overload or short-circuit - prevents device destruction without external sensing circuitry. |
| 52 kHz fixed-frequency operation | Enables consistent EMI filter design and use of standardized, low-cost inductors (e.g., Renco RL1952, Pulse PE-52627). |
| TTL shutdown interface | Allows microcontroller or system-level power sequencing with <200 µA standby current - suitable for battery-backed systems. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
|
Use Scenario: Converting 24 V rail to stable 12 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 12 V DC output. Use Value: Delivers full 1.0 A at 88% efficiency, minimizing heat generation and eliminating need for forced-air cooling in enclosed enclosures. |
Use Scenario: Pre-regulating 36 V lead-acid charger input down to 12 V before linear post-regulation and charge control. IC Role / Device Role / Timing Role: High-efficiency buck converter handling variable input during bulk charging phase. Use Value: Maintains regulation across 15–40 V input range while sustaining 1.0 A output - extends usable input voltage window vs. linear solutions. |
| On-Card DC-DC Conversion | Automotive Accessory Power |
|
Use Scenario: Generating local 12 V from 28 V vehicle supply for infotainment display backlight drivers. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator integrated directly onto host PCB. Use Value: TO-220 package allows direct heatsink attachment; MSL Level 1 rating supports standard reflow assembly. |
Use Scenario: Powering USB-C PD accessories (e.g., dashcams) from 12 V automotive battery with transient ride-through. IC Role / Device Role / Timing Role: Input-filtered buck stage tolerant of load-dump and cold-crank conditions (4.75–40 V). Use Value: Withstands 45 V absolute max input and −40°C to +125°C operation - meets automotive ambient requirements without derating. |
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 | Higher input voltage rating: 60 V max vs. 40 V; otherwise identical pinout, output, and features. | Required for 48 V telecom or industrial systems where input may exceed 40 V during transients. | Select LM2575HVT-12 only if input can exceed 40 V; otherwise LM2575T-012 offers cost and thermal advantage. |
| MP1584EN-LF-Z | 40 V max input, 3 A output, 1.5 MHz switching, smaller SO-8 package - no TO-220 heatsink option. | Preferred for space-constrained designs needing >1 A or higher efficiency at light loads; lacks integrated heatsink interface. | Choose MP1584EN-LF-Z for compact, high-frequency designs; retain LM2575T-012 for proven thermal performance and ease of heatsinking. |
Compared with LM2575HVT-12 and MP1584EN-LF-Z, the LM2575T-012 provides optimal balance of ruggedness, thermal manageability via TO-220, and design simplicity for 12 V/1 A industrial applications - without requiring high-frequency layout expertise or ultra-wide input compliance.
Availability
LM2575T-012 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 traceable sourcing.
Supply support for LM2575T-012 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 power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a cost-optimized, easy-to-use monolithic buck regulator family targeting board-level power conversion where simplicity, reliability, and thermal robustness outweigh ultra-high efficiency or miniaturization demands.
FAQ
What is the maximum input voltage rating for the LM2575T-012?
The LM2575T-012 has an absolute maximum input voltage rating of 45 V, with recommended continuous operation up to 40 V. Exceeding 45 V risks permanent damage. For applications with potential transients above 40 V - such as 48 V systems - the LM2575HVT-12 (60 V rated) is the appropriate alternative. The LM2575T-012 datasheet specifies 4.75–40 V as the functional operating range.
Does the LM2575T-012 require external feedback resistors?
No, the LM2575T-012 does not require external feedback resistors. It is a fixed-output variant with internal resistor divider set for 12 V, so Pin 4 (Feedback) is internally connected and not accessible for adjustment. This eliminates tuning complexity and improves stability versus adjustable versions like the LM2575ADJ, where resistor selection directly affects output accuracy and temperature drift.
Can the LM2575T-012 be used in automotive applications?
Yes - the LM2575T-012 operates across −40°C to +125°C junction temperature and supports input voltages compatible with 12 V and 24 V automotive systems (4.75–40 V). While not AEC-Q100 qualified itself, its NCV2575-12 automotive-grade counterpart is certified. For non-safety-critical accessory power (e.g., infotainment peripherals), the LM2575T-012 is widely deployed with proper input filtering.
What is the purpose of the ON/OFF pin (Pin 5) on the LM2575T-012?
Pin 5 (ON/OFF) provides TTL-compatible enable/disable control: applying ≥2.4 V disables the regulator, reducing quiescent current to ~80 µA; applying ≤1.0 V enables normal operation. This allows precise system-level power sequencing, sleep-mode control, or fault-initiated shutdown - without requiring external MOSFETs or logic-level translators. The LM2575T-012's low standby current makes it suitable for battery-powered standby circuits.
Which inductor value is recommended for the LM2575T-012 in a standard 12 V output design?
A 330 µH inductor is the standard recommendation for the LM2575T-012 at 1.0 A output, per Figure 19 (Inductor Value Selection Guide) and typical application circuit (Figure 14). Validated part numbers include Renco RL1952, Pulse PE-52627, and Coilcraft DO5022P-334. Inductor saturation current must exceed 1.7 A peak (per datasheet current limit spec), and DCR should be minimized to preserve efficiency.
LM2575T-012 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-012 FAQ
1.How can I place an order for LM2575T-012 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-012 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-012 reliable?
The price and inventory of LM2575T-012 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-012 is usually 5 days.
3.What payment methods are accepted for LM2575T-012?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-012 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-012?
LM2575T-012 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-012 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-012?
For technical support, including LM2575T-012 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-012 requirements.
6.How does Aetrix verify that LM2575T-012 is sourced from the original manufacturer or authorized distributors?
All LM2575T-012 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-012 meets industry standards.
7.What is the process for return or replacement of LM2575T-012?
All LM2575T-012 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-012, 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-012 part is unused and in its original packaging.
Return procedure for LM2575T-012:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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