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onsemi LM2575D2T-5R4G
- Part No.:
- LM2575D2T-5R4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-5R4G.pdf
- Description:
- IC REG BUCK 5V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,688
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Product details
Overview
LM2575D2T-5R4G from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 5.0 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 8.0 V to 40 V input and is used in on-card DC-DC conversion for industrial power supplies.
For engineers reviewing the LM2575D2T-5R4G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A load capability, D2PAK (TO-263) package thermal performance, 52 kHz fixed-frequency operation, and TTL-compatible ON/OFF control with 80 µA standby current.
Technical Context
The LM2575D2T-5R4G implements a voltage-mode controlled buck converter with an internal 1.0 A NPN switch, 1.23 V bandgap reference, and error amplifier driving a PWM comparator. Its 52 kHz oscillator sets fixed switching frequency, enabling predictable EMI filtering and inductor selection using standard off-the-shelf parts.
Protection architecture includes cycle-by-cycle current limiting (1.4–3.2 A peak), thermal shutdown at ~150°C junction temperature, and logic-controlled shutdown via Pin 5 (ON/OFF), which reduces quiescent current to 15–400 µA depending on temperature. Feedback is internally connected for fixed 5.0 V output - no external resistors required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over −40°C to +125°C, 0.2–1.0 A load, 8–40 V input - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Output Current | 1.0 A continuous - supports single-rail power for FPGA I/O banks, sensor signal chains, or motor driver logic sections. |
| Input Voltage Range | 8.0 V to 40 V - accommodates wide-input industrial 12/24 V systems and battery-backed applications with voltage sag. |
| Switching Frequency | 52 kHz (±10% over temp) - enables use of low-cost, high-saturation-current toroidal inductors (e.g., 330 µH) with minimal core loss. |
| Efficiency | 77% typical at 12 VIN, 1.0 A, 5 VOUT - reduces thermal load vs. linear regulators; often eliminates heatsink in ≤1 W dissipation designs. |
| Standby Quiescent Current | 80 µA typical at 25°C when ON/OFF pin ≥2.2 V - enables low-power sleep modes in battery-operated equipment. |
| Thermal Resistance | Junction-to-case 5.0°C/W - requires direct heatsink contact to Pin 3 (GND tab) for >0.7 A continuous operation at 70°C ambient. |
Pinout & Package
D2PAK (TO-263-5) package with exposed metal tab (Pin 3) electrically connected to GND and thermally coupled to heatsink surface. Requires solder pad thermal relief and minimum 1.5 cm² copper area for rated current derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 8–40 V unregulated DC; requires low-ESR 100 µF input capacitor placed within 5 mm to minimize switching noise injection. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5.0 V; PCB copper area must be minimized to reduce coupling into sensitive analog/feedback paths. |
| 3 - GND | Circuit ground / heatsink connection | Common return for input/output capacitors and catch diode; exposed tab must be soldered to large thermal pad for thermal management. |
| 4 - Feedback | Internal voltage divider tap | Internally tied to 5.0 V output - no external resistor network needed; unused for fixed-output versions. |
| 5 - ON/OFF | Logic-level shutdown control | TTL-compatible: ≤1.2 V = ON, ≥2.2 V = OFF; draws only 15–30 µA when held high, enabling microcontroller-driven power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and temperature drift errors in cost-sensitive designs. |
| Integrated protection | Cycle-by-cycle current limit + thermal shutdown prevent damage during short-circuit or overload - no external sensing components required. |
| 52 kHz fixed oscillator | Enables consistent EMI filter design and compatibility with standardized inductor families (e.g., Renco RL1952, Pulse PE-52627). |
| TTL shutdown interface | Allows clean power gating with 3.3 V or 5 V logic without level-shifting - supports low-power system states in embedded controllers. |
| D2PAK thermal performance | 5.0°C/W junction-to-case resistance enables 1.0 A operation up to 70°C ambient with minimal heatsinking - superior to TO-220 alternatives. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powers digital isolators, CAN transceivers, and GPIO buffers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying isolated communication interfaces and sensor front-ends. Use Value: Delivers 1.0 A at 77% efficiency from 24 V bus, reducing heat buildup in confined DIN-rail enclosures without forced air. |
Use Scenario: Supplies 5 V rail to microcontroller peripherals including LIN transceivers, LED drivers, and window lift sensors. IC Role / Device Role / Timing Role: Main DC-DC converter for body electronics subsystems requiring automotive-grade reliability. Use Value: Withstands 40 V load-dump transients and operates down to −40°C; MSL-1 moisture rating simplifies reflow assembly. |
| Point-of-Sale Terminal Power | Medical Infusion Pump Logic Supply |
|
Use Scenario: Generates clean 5 V for touchscreen controllers, thermal printers, and secure element ICs in retail kiosks. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 12 V adapter input, decoupled from noisy AC-DC stage. Use Value: Fixed 5.0 V output eliminates calibration drift; 80 µA shutdown current extends battery backup runtime during idle periods. |
Use Scenario: Provides isolated 5 V logic power for pump motor control MCU and display interface in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical auxiliary supply meeting IEC 60601-1 creepage/clearance requirements via board layout isolation. Use Value: Thermal shutdown prevents fault propagation; ±4% output tolerance ensures reliable ADC reference and timing circuit operation. |
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-5.0 | TO-220-5 package; higher RJA (65°C/W); same electrical specs and pinout. | Suitable for lower-current (<0.7 A), non-heatsinked, or through-hole prototyping use cases. | Select when mechanical mounting constraints favor vertical TO-220 or when thermal budget allows larger case size. |
| MP1584EN-LF-Z | 4.5–28 V input; 1.5 A output; 1.4 MHz switching; requires external feedback resistors. | Better suited for compact, high-efficiency designs where board space is limited and higher frequency permits smaller magnetics. | Choose for new designs needing higher current or smaller solution size - not drop-in compatible due to different pinout and control scheme. |
Compared with LM2575T-5.0, LM2575D2T-5R4G offers superior thermal performance in surface-mount layouts; versus MP1584EN-LF-Z, it trades higher frequency and current for proven ruggedness, simpler design, and fixed-output convenience in industrial environments.
Availability
LM2575D2T-5R4G is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, and medical device logic rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575D2T-5R4G 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2575 series was designed as a robust, low-component-count buck regulator family targeting cost-sensitive, high-reliability industrial and automotive power conversion - emphasizing simplicity, thermal resilience, and built-in protection.
FAQ
What is the maximum input voltage for LM2575D2T-5R4G?
The absolute maximum input voltage for LM2575D2T-5R4G 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 under transient conditions, especially during load dump events common in automotive applications. The device maintains regulation from 8.0 V to 40 V input while delivering full 1.0 A output.
Does LM2575D2T-5R4G require external feedback resistors?
No, LM2575D2T-5R4G does not require external feedback resistors. As a fixed 5.0 V output version, its internal resistor divider is factory-trimmed and connected directly to the error amplifier - Pin 4 (Feedback) is internally tied to the output. External resistors are only needed for the adjustable variant (LM2575ADJ).
How is thermal management handled on LM2575D2T-5R4G?
LM2575D2T-5R4G uses the D2PAK package with Pin 3 (GND) as an exposed metal tab thermally connected to the die. Effective thermal management requires soldering this tab to ≥1.5 cm² of 2-oz copper with thermal vias to inner ground planes. Junction-to-case resistance is 5.0°C/W; without heatsinking, continuous 1.0 A operation is limited to ≤50°C ambient.
Can LM2575D2T-5R4G be used in automotive applications?
Yes, LM2575D2T-5R4G meets key automotive requirements: it operates from −40°C to +125°C junction temperature, withstands 40 V input (covering 12 V system load dump), and is available in AEC-Q100 qualified variants (NCV2575D2T-5R4G). While LM2575D2T-5R4G itself is not automotive-grade, its identical electrical behavior and packaging make it suitable for non-safety-critical body electronics with proper system-level validation.
What catch diode is recommended for LM2575D2T-5R4G?
The datasheet recommends the 1N5819 Schottky diode for LM2575D2T-5R4G - rated at 1.0 A average forward current and 40 V PIV. Its low forward voltage (~0.45 V) minimizes conduction loss and improves efficiency. For higher reliability, the MBR140 or SS14 are direct replacements with tighter VF tolerance and enhanced surge capability.
LM2575D2T-5R4G 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):
- 5V
- 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-5R4G FAQ
1.How can I place an order for LM2575D2T-5R4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-5R4G 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-5R4G reliable?
The price and inventory of LM2575D2T-5R4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-5R4G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-5R4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-5R4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-5R4G?
LM2575D2T-5R4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-5R4G 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-5R4G?
For technical support, including LM2575D2T-5R4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-5R4G requirements.
6.How does Aetrix verify that LM2575D2T-5R4G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-5R4G 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-5R4G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-5R4G?
All LM2575D2T-5R4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-5R4G, 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-5R4G part is unused and in its original packaging.
Return procedure for LM2575D2T-5R4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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