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onsemi LM2575D2T-3.3R4G
- Part No.:
- LM2575D2T-3.3R4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-3.3R4G.pdf
- Description:
- IC REG BUCK 3.3V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,364
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Product details
Overview
LM2575D2T-3.3R4G from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current at fixed 3.3 V with ±4% output voltage tolerance, 52 kHz internal oscillator frequency, and wide 4.75 V to 40 V input range - used in embedded power supplies requiring high efficiency over linear regulators.
For engineers reviewing the LM2575D2T-3.3R4G datasheet, pinout, applications, or equivalent options, key selection considerations include thermal shutdown protection, TTL-compatible ON/OFF control, cycle-by-cycle current limiting, and D2PAK (TO-263) package suitability for medium-power board-level DC-DC conversion.
Technical Context
The LM2575D2T-3.3R4G integrates a 1.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and thermal/current protection circuitry. Its fixed-output architecture eliminates external feedback resistors, simplifying design versus adjustable versions.
It operates in continuous conduction mode with typical 75% efficiency at 12 V input / 1.0 A load, and features an internal 3.1 V regulator powering control logic. Standby quiescent current is 80 µA when ON/OFF pin is high, enabling low-power system sleep modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over line/load/temperature - ensures stable logic supply without trimming. |
| Max Output Current | 1.0 A continuous - supports microcontroller cores, FPGAs, and peripheral rails in industrial controllers. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 5 V, 12 V, 24 V, and unregulated battery or adapter inputs. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 330 µH). |
| Efficiency | 75% typ. at Vin = 12 V, Iout = 1.0 A - reduces thermal load vs. linear regulators, often eliminating heatsinks. |
| Quiescent Current | 5.0–9.0 mA active, 80 µA standby - supports low-power wake-on-event architectures. |
| Protection Features | Cycle-by-cycle current limit + thermal shutdown - prevents damage during short-circuit or overload faults. |
Pinout & Package
LM2575D2T-3.3R4G uses the D2PAK (TO-263-5) package (Case 936A), with exposed heatsink pad electrically connected to Pin 3 (GND) for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤1.2 V at 1.0 A - impacts dropout and efficiency at low VIN. |
| 3 - GND | Circuit ground reference | Common return for control logic, feedback, and power path; tied to heatsink surface for thermal conduction. |
| 4 - Feedback | Regulation sense input | Internally connected to 3.3 V divider; unused in fixed-version - must be left open or grounded per layout guidelines. |
| 5 - ON/OFF | Logic-enable control | TTL-compatible: ≤1.0 V = ON, ≥2.2 V = OFF; draws only 80 µA in shutdown - enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external resistor network - reduces BOM count and layout sensitivity vs. adjustable variants. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with standard inductor families (e.g., Renco RL1952, Pulse PE-52627). |
| TTL shutdown capability | Supports microcontroller GPIO control of power rail - critical for battery-powered devices needing deep-sleep modes. |
| Thermal + current limiting | Self-protecting under fault: no external circuitry needed for safe operation across ambient temperatures (−40°C to +125°C). |
| D2PAK package | High thermal performance (RθJC = 5.0°C/W) with surface-mount footprint - balances power density and manufacturability. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers and CAN transceivers from 24 V vehicle or factory bus. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator supplying MCU, level shifters, and communication PHYs. Use Value: High efficiency (≥75%) minimizes heat buildup in sealed enclosures; wide input range tolerates load-dump transients up to 40 V. |
Use Scenario: Generating 3.3 V for microcontroller, EEPROM, and sensor interfaces in door module or lighting controller. IC Role / Device Role / Timing Role: Main system regulator meeting AEC-Q100 requirements via NCV-series qualification path. Use Value: Built-in thermal shutdown and current limit ensure robustness against wiring faults or connector shorts in harsh environments. |
| Medical Point-of-Care Device | Networking Edge Router Board |
|
Use Scenario: Providing clean, regulated 3.3 V to ARM Cortex-M based patient monitor subsystems powered by Li-ion or AC adapter. IC Role / Device Role / Timing Role: Secondary DC-DC stage stepping down 5 V or 12 V intermediate rail to logic voltage. Use Value: Low 80 µA standby current extends battery runtime during idle periods without compromising startup time. |
Use Scenario: On-card power conversion for FPGA configuration, PHYs, and management MCU in compact Ethernet switches. IC Role / Device Role / Timing Role: Compact, high-current buck converter replacing discrete MOSFET+controller solutions. Use Value: D2PAK package allows >1 A delivery with minimal PCB area; fixed 3.3 V eliminates feedback trace routing noise susceptibility. |
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-3.3G | TO-220-5 package (Case 314D); higher RθJA (65°C/W) vs. D2PAK's 70°C/W; identical electrical specs. | Better suited for through-hole prototyping or low-volume assemblies with heatsink mounting. | Select when mechanical mounting constraints favor TO-220 or legacy board compatibility is required. |
| MP1584EN-LF-Z | 4.5–28 V input, 1.5 A output, 1.5 MHz switching; requires external feedback resistors; smaller SOIC-8 package. | Higher frequency enables smaller magnetics but increases EMI filtering complexity and sensitivity to layout. | Choose for space-constrained designs where 1.5 A and 1.5 MHz operation justify added design effort and component count. |
Compared with LM2575T-3.3G, the LM2575D2T-3.3R4G offers superior thermal resistance in surface-mount form; versus MP1584EN-LF-Z, it trades higher frequency for simpler design, proven reliability, and wider input range - ideal for cost-sensitive, thermally demanding industrial applications.
Availability
LM2575D2T-3.3R4G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LM2575D2T-3.3R4G 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 drop-in replacement for linear regulators in medium-power DC-DC applications - emphasizing simplicity, ruggedness, and minimal external component count for rapid power supply implementation.
FAQ
What is the maximum input voltage rating for LM2575D2T-3.3R4G?
The absolute maximum input voltage for LM2575D2T-3.3R4G is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating guaranteed performance limits, especially under high-temperature conditions. The device includes internal protection, but sustained operation above 40 V may reduce reliability. LM2575D2T-3.3R4G is rated for continuous operation from 4.75 V to 40 V.
Does LM2575D2T-3.3R4G require an external feedback resistor network?
No, LM2575D2T-3.3R4G is a fixed-output version with internal resistor divider set to 3.3 V; Pin 4 (Feedback) is not connected to the output and must be left unconnected or grounded per layout guidelines. Unlike the adjustable LM2575-ADJ, this part eliminates external R1/R2 components - reducing BOM cost and layout sensitivity while maintaining ±4% output accuracy across temperature and load.
What thermal performance can be expected from LM2575D2T-3.3R4G in a standard 2-layer PCB?
With 1 in² copper pour connected to the exposed heatsink pad (Pin 3/GND), LM2575D2T-3.3R4G achieves ~45°C/W junction-to-ambient thermal resistance - significantly better than the datasheet's 70°C/W (Figure 34) for minimal copper. At 1.0 A and 12 V input, dissipation is ~1.1 W; this yields ~50°C rise above ambient, typically within safe operating limits without a heatsink. LM2575D2T-3.3R4G's RθJC = 5.0°C/W enables efficient heat transfer to the PCB.
Can LM2575D2T-3.3R4G be used in automotive applications?
Yes - the LM2575D2T-3.3R4G is manufactured in onsemi's automotive-qualified process flow and shares design heritage with the NCV2575 series (AEC-Q100 qualified). While LM2575D2T-3.3R4G itself carries commercial temperature grading (−40°C to +125°C), its architecture, protection features, and robustness make it widely deployed in non-safety-critical automotive modules such as infotainment power supplies and body control units - provided system-level validation confirms compliance.
What is the purpose of the ON/OFF pin (Pin 5) on LM2575D2T-3.3R4G?
Pin 5 provides TTL-compatible enable/disable control: driving it ≥2.2 V shuts down the regulator, reducing total input current to ~80 µA; pulling it ≤1.0 V activates regulation. This allows precise system-level power sequencing, battery-saving sleep modes, or fault-initiated shutdown. The pin draws only 30 µA when high, making it compatible with standard MCU GPIOs without buffering. LM2575D2T-3.3R4G supports both active-high and active-low logic configurations via external pull-up/down.
LM2575D2T-3.3R4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 3.3V
- 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-3.3R4G FAQ
1.How can I place an order for LM2575D2T-3.3R4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-3.3R4G 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-3.3R4G reliable?
The price and inventory of LM2575D2T-3.3R4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-3.3R4G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-3.3R4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-3.3R4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-3.3R4G?
LM2575D2T-3.3R4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-3.3R4G 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-3.3R4G?
For technical support, including LM2575D2T-3.3R4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-3.3R4G requirements.
6.How does Aetrix verify that LM2575D2T-3.3R4G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-3.3R4G 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-3.3R4G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-3.3R4G?
All LM2575D2T-3.3R4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-3.3R4G, 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-3.3R4G part is unused and in its original packaging.
Return procedure for LM2575D2T-3.3R4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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