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onsemi LM2575D2T-012
- Part No.:
- LM2575D2T-012
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-012.pdf
- Description:
- IC REG BUCK 12V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,946
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Product details
Overview
LM2575D2T-012 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 12 V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 15 V to 40 V input and is used in on-card DC-DC conversion for industrial power supplies.
For engineers reviewing the LM2575D2T-012 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A load capability, fixed 12 V output without external feedback resistors, D2PAK (TO-263) package thermal performance, and compatibility with standard 330 µH inductors and Schottky catch diodes.
Technical Context
The LM2575D2T-012 integrates a 1.0 A NPN bipolar switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and TTL-compatible ON/OFF control. Its fixed-output architecture eliminates external feedback components, simplifying design versus adjustable versions.
It employs voltage-mode PWM control with cycle-by-cycle current limiting and thermal shutdown. The internal 3.1 V regulator powers bias circuitry, and the ON/OFF pin enables logic-level shutdown with 80 µA standby current at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over −40°C to +125°C, 15 V ≤ Vin ≤ 40 V, 0.2 A ≤ IOUT ≤ 1.0 A - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Max Output Current | 1.0 A continuous - supports moderate-power loads such as microcontrollers, sensors, or interface ICs without external current boosting. |
| Input Voltage Range | 15 V to 40 V - compatible with 24 V industrial bus, automotive battery systems (with transient protection), and unregulated AC/DC outputs. |
| Oscillator Frequency | 52 kHz ±10% (−40°C to +125°C) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 88% at Vin = 15 V, IOUT = 1.0 A - significantly exceeds linear regulators under same conditions, minimizing heat dissipation and eliminating need for large heatsinks. |
| Standby Quiescent Current | 80 µA typical at 25°C when ON/OFF pin ≥ 2.4 V - enables ultra-low-power shutdown mode for battery-backed or energy-sensitive systems. |
| Saturation Voltage | 1.2 V max at IOUT = 1.0 A, −40°C to +125°C - defines minimum dropout (VIN − VOUT) required for regulation; mandates ≥15 V input for reliable 12 V output. |
Pinout & Package
D2PAK (TO-263) package with exposed thermal pad (terminal 6) electrically connected to Pin 3 (GND); requires PCB copper area for thermal conduction and mechanical anchoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 15–40 V unregulated DC; must be bypassed with low-ESR capacitor (e.g., 100 µF/50 V) placed adjacent to pin to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Delivers regulated 12 V; PCB trace area must be minimized to reduce coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, inductor, and catch diode; single-point grounding recommended to avoid ground loops. |
| 4 - Feedback | Output voltage sense (not used in fixed version) | Internally connected to 12 V divider; left unconnected in LM2575D2T-012 - no external resistor network required. |
| 5 - ON/OFF | Logic-controlled enable/disable | Drives regulator into low-power shutdown when ≥2.4 V applied; connects to GND or ≤0.8 V for normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors and associated layout sensitivity, reducing BOM count and improving long-term stability. |
| Integrated protection | Cycle-by-cycle current limiting and thermal shutdown prevent damage during overload, short-circuit, or elevated ambient temperature conditions. |
| TTL-compatible ON/OFF | Enables direct interfacing with microcontroller GPIO or system power sequencers without level-shifting circuitry. |
| Standard inductor support | Optimized for widely available 330 µH inductors (e.g., Renco RL1952, Pulse PE-52627), simplifying sourcing and qualification. |
| Moisture Sensitivity Level 1 | Allows unlimited floor life before reflow; no baking required prior to assembly - reduces manufacturing overhead. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V vehicle battery or factory 24 V DC bus to stable 12 V for MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and protected 12 V rail. Use Value: Delivers 1.0 A at 88% efficiency, reducing thermal load in sealed enclosures and enabling compact heatsink-free designs. |
Use Scenario: Powering microcontroller-based lighting, door lock, and window lift modules in passenger vehicles. IC Role / Device Role / Timing Role: Fixed-output buck converter meeting AEC-Q100 requirements for robustness and temperature range. Use Value: Withstand 40 V load-dump transients when paired with input TVS, and maintain regulation across −40°C to +125°C junction temperature. |
| On-Card DC-DC Converter | Pre-regulator for Linear Regulators |
|
Use Scenario: Generating local 12 V supply directly on PCBs hosting analog front-ends or mixed-signal ASICs. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator minimizing external component count to four (inductor, diode, input/output caps). Use Value: Reduces board space vs. discrete solutions while maintaining low output ripple (<1% with 330 µF output cap) and fast transient response. |
Use Scenario: Stepping down 24 V or 36 V intermediate rail to ~13.5 V before LDOs that require minimal dropout. IC Role / Device Role / Timing Role: High-efficiency pre-regulator lowering power dissipation in downstream linear regulators. Use Value: Enables 1.5 V headroom for LDOs instead of 10+ V, cutting total system power loss by >60% versus direct 24 V-to-3.3 V linear regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-12 | TO-220 package (Case 314D), higher RJA (65°C/W vs. 70°C/W), identical electrical specs. | Requires mechanical heatsink for >0.7 A continuous load at 50°C ambient; less suitable for high-density SMT layouts. | Select LM2575T-12 only when through-hole assembly or legacy footprint compatibility is required. |
| LM2596S-12 | Higher switching frequency (150 kHz), lower quiescent current (5 mA vs. 5–9 mA), but no built-in thermal shutdown latch. | Better suited for size-constrained designs needing smaller inductors/caps; lacks fault-holdoff behavior during sustained overload. | Choose LM2596S-12 when board area is critical and thermal management is externally controlled; verify fault recovery behavior in safety-critical systems. |
Compared with LM2575T-12, the LM2575D2T-012 offers superior thermal resistance in surface-mount form, while LM2596S-12 trades integrated protection for higher frequency and smaller passives - making LM2575D2T-012 optimal for rugged, thermally constrained industrial applications requiring proven fault resilience.
Availability
LM2575D2T-012 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM2575D2T-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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2575 series was designed as a cost-optimized, easy-to-use monolithic buck regulator family targeting applications where simplicity, reliability, and wide input range outweigh ultra-high efficiency or miniaturization demands.
FAQ
What is the maximum input voltage rating for LM2575D2T-012?
The absolute maximum input voltage for LM2575D2T-012 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 during transients, especially when combined with high output current or elevated temperature. Always include input transient suppression (e.g., TVS diode) if used in automotive or industrial environments with potential load-dump events.
Does LM2575D2T-012 require external feedback resistors to set its output voltage?
No, LM2575D2T-012 does not require external feedback resistors. It is a fixed-output variant with internal resistor divider configured for 12 V. Pin 4 (Feedback) is internally connected and must remain unconnected in circuit layout - adding external components here will disrupt regulation and may cause instability or overvoltage.
Can LM2575D2T-012 be used without a heatsink?
Yes, LM2575D2T-012 can operate without an external heatsink under typical conditions: at 1.0 A load, 25°C ambient, and 15 V input, junction temperature rise is ~70°C (using RJA = 70°C/W), resulting in ~95°C - within the 150°C maximum. However, at 40 V input or >50°C ambient, thermal margin shrinks; PCB copper area under the exposed pad is mandatory for reliable operation.
What type of catch diode is recommended for LM2575D2T-012?
A Schottky diode rated for ≥3.0 A peak current and ≥30 V reverse voltage is recommended for LM2575D2T-012, such as the 1N5822 or MBR340. Schottky diodes minimize forward voltage drop (typically 0.4–0.5 V), improving efficiency and reducing thermal stress on both the diode and LM2575D2T-012. Fast-recovery PN diodes like UF4007 are acceptable but reduce efficiency by ~3–5%.
Is LM2575D2T-012 RoHS compliant and lead-free?
Yes, LM2575D2T-012 is a Pb-free device per the datasheet note "These are Pb−Free Devices" and complies with RoHS Directive 2011/65/EU. It uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1, allowing standard reflow profiles without preconditioning.
LM2575D2T-012 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2575D2T-012 FAQ
1.How can I place an order for LM2575D2T-012 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-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 LM2575D2T-012 reliable?
The price and inventory of LM2575D2T-012 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-012 is usually 5 days.
3.What payment methods are accepted for LM2575D2T-012?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-012 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-012?
LM2575D2T-012 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-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 LM2575D2T-012?
For technical support, including LM2575D2T-012 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-012 requirements.
6.How does Aetrix verify that LM2575D2T-012 is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-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 LM2575D2T-012 meets industry standards.
7.What is the process for return or replacement of LM2575D2T-012?
All LM2575D2T-012 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-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 LM2575D2T-012 part is unused and in its original packaging.
Return procedure for LM2575D2T-012:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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