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onsemi LM2575D2T-005
- Part No.:
- LM2575D2T-005
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
LM2575D2T-005.pdf
- Description:
- IC REG SW 1A 5V STEPDOWN D2PAK
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Inventory:2,361
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Product details
Overview
LM2575D2T-005 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 5.0 V fixed output at up to 1.0 A, with ±4% output voltage tolerance over line/load/temperature, 52 kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting. It serves as a high-efficiency primary DC-DC converter in industrial power supplies and embedded systems requiring stable 5 V rail generation from unregulated 8–40 V inputs.
For engineers reviewing the LM2575D2T-005 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, confirmed pin functions, real-world design meaning of key specs, and two validated alternative parts for 5 V buck conversion where input voltage exceeds 8 V and efficiency >77% is required.
Technical Context
The LM2575D2T-005 integrates a 1.0 A NPN switch, 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and TTL-compatible ON/OFF control logic. Its fixed 5.0 V output is internally trimmed-no external feedback resistors required-enabling minimal BOM count with only four external components: input capacitor, output capacitor, catch diode, and inductor.
It operates in continuous conduction mode with internal current limiting (1.4–3.2 A peak) and thermal shutdown. The 52 kHz switching frequency balances EMI performance and inductor size, while the 1.0 V typical saturation voltage (Vsat) directly determines conduction loss under full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±4% over −40°C to +125°C, 0.2–1.0 A load, 8–40 V input - ensures stable 5 V rail without trimming or calibration. |
| Max Output Current | 1.0 A DC - supports single-rail microcontroller, sensor, or logic subsystems without external boost. |
| Input Voltage Range | 4.75 V to 40 V - accommodates wide-input industrial, automotive, or battery-derived supplies (e.g., 12 V nominal with transients). |
| Switching Frequency | 52 kHz (±10% over temp) - enables use of low-cost, standard 330 µH inductors with predictable EMI filtering requirements. |
| Efficiency | 77% at 12 VIN, 1.0 A, 5 VOUT - reduces thermal load vs. linear regulators; often eliminates heatsink in <1 W dissipation designs. |
| Standby Current | 80 µA typical at ON/OFF = 5 V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Saturation Voltage | 1.0 V typical at 1.0 A - defines minimum dropout (VIN − VOUT) needed for regulation; impacts thermal design at high ILOAD. |
Pinout & Package
D2PAK (TO-263) package, case 936A, with heatsink surface electrically connected to Pin 3 (GND). Requires PCB copper area for thermal management per datasheet Figure 34.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR bypass capacitor (≥100 µF) placed adjacent to pin to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5 V; PCB trace area must be minimized to reduce coupling into sensitive analog or feedback paths. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and thermal pad; single-point grounding recommended to avoid ground loops. |
| 4 - Feedback | Output voltage sense input | Internally tied to 5 V divider; not accessible in fixed-output versions - no external resistor connection required. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.4 V) disables regulator (80 µA standby); logic-low (<0.8 V) enables - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors - reduces component count, layout complexity, and temperature drift uncertainty. |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown - prevents damage during short-circuit or overload without external circuitry. |
| 52 kHz oscillator | Enables use of off-the-shelf, low-cost 330 µH inductors (e.g., Renco RL1952, Pulse PE-52627) with predictable core loss and size. |
| TTL shutdown | 80 µA standby current with logic-level control - supports low-power states in portable or always-on embedded devices. |
| Wide input range | 4.75–40 V operation - supports direct connection to 12 V/24 V industrial buses, automotive batteries, or wide-range AC-DC outputs. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
|
Use Scenario: Generating 5 V rail from 24 V factory bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing clean, regulated 5 V to microcontroller, ADC, and digital isolators. Use Value: 77% efficiency at 1.0 A reduces heat rise in enclosed enclosures; 40 V max input withstands 24 V bus transients per IEC 61000-4-5. |
Use Scenario: On-board 5 V supply for ARM Cortex-M4-based edge node with CAN and Ethernet interfaces. IC Role / Device Role / Timing Role: Main DC-DC converter powering SoC core, peripherals, and interface PHYs from 12 V input. Use Value: Fixed 5 V output avoids feedback resistor tolerance stack-up; D2PAK thermal pad enables reliable 1 A operation without heatsink. |
| Battery Charger Auxiliary Rail | Test Equipment Power Module |
|
Use Scenario: Providing isolated 5 V logic supply in lithium-ion battery charger using flyback primary side. IC Role / Device Role / Timing Role: Secondary-side buck regulator converting 12 V auxiliary winding output to stable 5 V for MCU and display. Use Value: 80 µA shutdown current extends standby time; ±4% output tolerance ensures accurate ADC reference and USB compliance. |
Use Scenario: Modular 5 V/1 A power stage in benchtop multimeter or signal generator with multiple voltage rails. IC Role / Device Role / Timing Role: High-reliability, field-serviceable DC-DC module replacing aging linear regulators. Use Value: MSL Level 1 moisture rating simplifies assembly; TO-263 package allows manual rework and thermal inspection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-5.0 | TO-220 package (case 314D), same electrical specs, higher RJA (65°C/W vs. 70°C/W), requires heatsink above ~0.5 A. | Preferred for prototyping or low-volume boards with through-hole assembly; less suitable for high-density SMT layouts. | Select when mechanical mounting or manual heatsinking is preferred over surface-mount thermal pads. |
| MP1584EN-LF-Z | 4.5–28 V input, 52 kHz, 3 A output, adjustable via external resistors; smaller SO-8 package, no integrated thermal pad. | Higher current capability and smaller footprint, but requires feedback network and lacks 40 V input margin. | Select when board space is constrained and input stays ≤28 V; verify stability with MP1584-specific compensation. |
Compared with LM2575T-5.0, the LM2575D2T-005 offers superior thermal performance in SMT layouts due to its exposed D2PAK thermal pad, while MP1584EN-LF-Z trades input voltage headroom for higher current and smaller size-making LM2575D2T-005 optimal for rugged 24/40 V industrial 5 V rails.
Availability
LM2575D2T-005 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, battery charger auxiliary rails, and test equipment power modules requiring stable component supply with long-term lifecycle support.
Supply support for LM2575D2T-005 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 industrial and embedded applications where simplicity, reliability, and wide input range outweigh ultra-high efficiency or ultra-small footprint requirements.
FAQ
What is the maximum input voltage rating for LM2575D2T-005?
The absolute maximum input voltage for LM2575D2T-005 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. The LM2575D2T-005 is rated for continuous operation from 4.75 V to 40 V, making it suitable for 24 V industrial buses with transient spikes.
Does LM2575D2T-005 require external feedback resistors to set the 5 V output?
No, LM2575D2T-005 does not require external feedback resistors. It is the fixed 5.0 V version of the LM2575 family, with internal resistor divider and reference trimming. Pin 4 (Feedback) is internally connected and not user-accessible-only the adjustable version (LM2575-ADJ) uses external R1/R2.
What is the thermal resistance (RJA) of LM2575D2T-005 in its D2PAK package?
The thermal resistance from junction to ambient (RJA) for LM2575D2T-005 in the D2PAK (case 936A) package is 70°C/W, as specified in Figure 34 of the datasheet. This value assumes standard JEDEC 2S2P board layout; actual performance improves significantly with adequate copper pour connected to the exposed thermal pad (Pin 3/GND).
Can LM2575D2T-005 be used in automotive applications?
LM2575D2T-005 is not AEC-Q100 qualified. For automotive use, onsemi offers the NCV2575D2T-005 - the automotive-grade variant with PPAP capability and extended qualification. The LM2575D2T-005 is rated for −40°C to +125°C junction temperature but lacks automotive-specific stress testing and documentation.
What catch diode is recommended for LM2575D2T-005 in a 1 A application?
The datasheet recommends the 1N5819 Schottky diode (30 V, 1 A) for LM2575D2T-005 at 1 A load. Its low forward voltage (~0.45 V) minimizes conduction loss and improves efficiency. For higher reliability or elevated temperature operation, the 1N5822 (3 A, 40 V) or MBR140 (40 V, 1 A) are valid alternatives with improved surge rating.
LM2575D2T-005 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
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- Output Type:
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- Number of Outputs:
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- Voltage - Input (Min):
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- Voltage - Input (Max):
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- Voltage - Output (Min/Fixed):
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- Voltage - Output (Max):
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- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
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- Supplier Device Package:
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LM2575D2T-005 FAQ
1.How can I place an order for LM2575D2T-005 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-005 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-005 reliable?
The price and inventory of LM2575D2T-005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-005 is usually 5 days.
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4.How is shipping managed for LM2575D2T-005?
LM2575D2T-005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-005 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-005?
For technical support, including LM2575D2T-005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-005 requirements.
6.How does Aetrix verify that LM2575D2T-005 is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-005 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-005 meets industry standards.
7.What is the process for return or replacement of LM2575D2T-005?
All LM2575D2T-005 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-005, 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-005 part is unused and in its original packaging.
Return procedure for LM2575D2T-005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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