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onsemi LM2575D2T-012G
- Part No.:
- LM2575D2T-012G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-012G.pdf
- Description:
- IC REG BUCK 12V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
LM2575D2T-012G 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 wide 4.75 V to 40 V input range - used in industrial power supplies, battery chargers, and on-card DC-DC conversion.
For engineers reviewing the LM2575D2T-012G datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (D2PAK), confirmed thermal shutdown and cycle-by-cycle current limiting, exact feedback reference voltage (1.23 V), standby current (80 µA), and validated alternative parts for fixed 12 V buck designs.
Technical Context
The LM2575D2T-012G integrates a 1.0 A NPN switch, 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and TTL-compatible ON/OFF control. Its fixed-output architecture eliminates external feedback resistors, simplifying design versus adjustable variants.
It operates in continuous conduction mode with cycle-by-cycle current limiting and thermal shutdown protection. The internal switch saturation voltage is 1.0 V typical at 1.0 A, enabling high efficiency (88% at 15 VIN/1.0 A) without heatsink under moderate loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over −40°C to +125°C, 0.2–1.0 A load, 15–40 V input - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Output Current | 1.0 A guaranteed - supports mid-power applications like motor drivers or sensor modules without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 12 V automotive batteries (with cold-crank margin), industrial 24 V rails, and wide-input off-line pre-regulators. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) with minimal EMI filtering. |
| Efficiency | 88% typical at 15 VIN, 1.0 A load - reduces thermal load vs. linear regulators; often eliminates need for heatsink in enclosed enclosures. |
| Standby Quiescent Current | 80 µA typical at 25°C when ON/OFF pin = 5 V - enables low-power sleep modes in battery-backed systems. |
| Thermal Protection | Internal thermal shutdown - prevents permanent damage during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
D2PAK (TO-263) package (Case 936A), surface-mount, heatsink pad (terminal 6) internally connected to Pin 3 (GND); requires minimum 1-in² copper pour for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR 100 µF input capacitor placed within 5 mm 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 analog sections. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and feedback network; single-point grounding recommended. |
| 4 - Feedback | Internal voltage sense node | Internally tied to 12 V divider; not accessible - no external resistor connection required for fixed-output operation. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator, reducing input current to ~80 µA; logic-low (<1.2 V) enables regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity - ideal for cost-sensitive volume designs. |
| Integrated 1.0 A switch | Removes need for external MOSFET and driver; simplifies thermal design with known RDS(on)-equivalent saturation (1.0 V). |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with standard off-the-shelf inductors (e.g., Renco RL1952, Pulse PE-52627). |
| TTL shutdown with 80 µA standby | Supports system-level power sequencing and battery conservation - compatible with microcontroller GPIO without level shifting. |
| Full protection suite | Cycle-by-cycle current limiting + thermal shutdown + output short-circuit recovery - ensures robustness in field-deployed equipment. |
Applications
| Industrial Power Supply | Battery Charger Control |
|---|---|
|
Use Scenario: Providing clean 12 V rail for PLC I/O modules operating from 24 V factory bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V input to isolated 12 V logic supply. Use Value: 88% efficiency minimizes heat rise in sealed enclosures; ±4% tolerance ensures reliable MCU reset behavior across temperature. |
Use Scenario: Charging 12 V lead-acid battery from variable solar panel output (18–36 V). IC Role / Device Role / Timing Role: Constant-voltage stage regulator maintaining 13.8 V float charge (via external resistor scaling). Use Value: Wide 4.75–40 V input handles MPPT fluctuations; thermal shutdown prevents battery overheat during fault conditions. |
| On-Card DC-DC Conversion | Pre-Regulator for Linear LDOs |
|
Use Scenario: Generating local 12 V from 48 V backplane in telecom line cards. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator feeding downstream point-of-load converters. Use Value: D2PAK package allows direct mounting to metal chassis for passive cooling; 52 kHz frequency avoids audio-band noise. |
Use Scenario: Reducing 24 V supply to 15 V before low-noise linear regulator for RF front-end biasing. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing power dissipation in downstream LDO. Use Value: 1.0 V saturation drop enables >10 V input-output differential; 88% efficiency cuts total thermal load by >50% vs. linear solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-12 | TO-220 package (Case 314D), same electrical specs, higher RJA (65°C/W vs. 70°C/W), requires mechanical heatsink for >0.7 A continuous. | Preferred for prototyping or low-volume through-hole assembly; less suitable for automated SMT production. | Select when manual assembly, thermal testing, or legacy board compatibility is required. |
| MP1584EN-LF-Z | 4.5–28 V input, 1.5 A output, 1.4 MHz switching, adjustable only - requires external feedback resistors and smaller inductor (4.7 µH). | Better for space-constrained designs needing higher efficiency at light loads; not pin-compatible or functionally drop-in. | Choose for new designs prioritizing size/efficiency trade-offs; not a replacement without layout and component changes. |
Compared with LM2575D2T-012G, LM2575T-12 offers identical regulation but demands heatsinking above 700 mA, while MP1584EN-LF-Z enables compact layouts at higher frequency but sacrifices fixed-output simplicity and automotive-grade qualification.
Availability
LM2575D2T-012G is available at Aetrix Electronics and suitable for industrial power supplies, battery charger control circuits, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM2575D2T-012G 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 is a global semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, and automotive-qualified components.
The LM2575 series was designed for simple, robust, high-efficiency step-down conversion in industrial, automotive, and consumer power systems - emphasizing minimal external parts and intrinsic fault protection.
FAQ
What is the maximum input voltage rating for LM2575D2T-012G?
The absolute maximum input voltage for LM2575D2T-012G is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V may trigger internal protection or degrade long-term reliability. LM2575D2T-012G maintains regulation and thermal safety up to 40 V with proper input capacitance and thermal management.
Does LM2575D2T-012G require an external feedback resistor network?
No. LM2575D2T-012G is a fixed-output variant with internal resistor divider set for 12 V; Pin 4 (Feedback) is not user-accessible and must remain unconnected. External resistors are only required for the adjustable LM2575ADJ version - using them with LM2575D2T-012G would disrupt regulation.
What is the thermal resistance (RJA) of LM2575D2T-012G in its D2PAK package?
LM2575D2T-012G in the D2PAK (Case 936A) package has a junction-to-ambient thermal resistance (RJA) of 70°C/W, measured per Figure 34 in the datasheet under standard JEDEC test conditions. Actual RJA improves significantly with ≥1 in² copper pour connected to the exposed heatsink pad (Pin 3/GND).
Can LM2575D2T-012G be used in automotive applications?
Yes - the NCV2575 variant is AEC-Q100 qualified and PPAP capable, but LM2575D2T-012G is the commercial-grade part. While it shares identical electrical specs and MSL1 moisture rating, LM2575D2T-012G lacks automotive-specific qualification documentation and screening. For production automotive use, specify NCV2575D2T-012G instead.
What catch diode is recommended for LM2575D2T-012G in a 1.0 A application?
The datasheet recommends the 1N5819 Schottky diode (30 V, 1 A) for LM2575D2T-012G at full 1.0 A load. Its low forward voltage (~0.45 V) minimizes conduction loss and improves efficiency. For higher reliability or surge margin, the 1N5822 (3.0 A, 40 V) or MBR140 (40 V, 1.4 A) are validated alternatives with same footprint compatibility.
LM2575D2T-012G 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-012G FAQ
1.How can I place an order for LM2575D2T-012G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-012G 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-012G reliable?
The price and inventory of LM2575D2T-012G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-012G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-012G?
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4.How is shipping managed for LM2575D2T-012G?
LM2575D2T-012G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-012G 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-012G?
For technical support, including LM2575D2T-012G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-012G requirements.
6.How does Aetrix verify that LM2575D2T-012G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-012G 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-012G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-012G?
All LM2575D2T-012G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-012G, 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-012G part is unused and in its original packaging.
Return procedure for LM2575D2T-012G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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