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onsemi LM2575D2T-5G
- Part No.:
- LM2575D2T-5G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-5G.pdf
- Description:
- IC REG BUCK 5V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,598
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Product details
Overview
LM2575D2T-5G from onsemi is a monolithic step-down (buck) switching regulator IC delivering a fixed 5.0 V output at up to 1.0 A, with 4.75 V to 40 V input range, 52 kHz internal oscillator, 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 inputs.
For engineers reviewing the LM2575D2T-5G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed ±4% output voltage tolerance over line/load/temperature, TTL-compatible ON/OFF control with 80 µA standby current, and D2PAK (TO-263) package suitability for medium-power board-level regulation without heatsink under typical conditions.
Technical Context
The LM2575D2T-5G implements a voltage-mode controlled buck topology with an internal 1.0 A NPN switch, 1.23 V bandgap reference, and error amplifier driving a 52 kHz fixed-frequency oscillator. Its feedback loop senses output voltage via internal resistor divider (fixed 5 V version), enabling regulation without external programming resistors.
Protection architecture includes cycle-by-cycle peak current limiting (typ. 2.3 A at 25°C), thermal shutdown activation above ~150°C junction temperature, and built-in 3.1 V internal regulator powering control circuitry - all operating independently of external components.
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, and 8–40 V input - ensures stable logic supply across automotive and industrial temperature ranges. |
| Max Output Current | 1.0 A continuous - supports microcontroller cores, sensors, and peripheral ICs without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 5 V, 12 V, 24 V, and 36 V nominal bus systems, including battery-backed or wide-range industrial inputs. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 330 µH) with minimal EMI filtering. |
| Efficiency | 77% at 12 VIN, 5 V/1.0 A - reduces thermal load vs. linear regulators; eliminates need for heatsink in many PCB layouts with moderate airflow. |
| Standby Quiescent Current | 80 µA typical at 25°C when ON/OFF pin = 5 V - enables low-power system sleep modes without auxiliary LDOs. |
| Thermal Resistance | Junction-to-case 5.0°C/W - allows direct heatsink mounting via exposed tab (Pin 3) for sustained 1 A operation at elevated ambient temperatures. |
Pinout & Package
D2PAK (TO-263) package with exposed metal tab thermally and electrically connected to Pin 3 (GND); requires minimum copper area for thermal dissipation and single-point grounding per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF/50 V) placed adjacent to minimize switching noise coupling. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5 V; saturation voltage ≤1.2 V at 1.0 A - contributes directly to dropout and efficiency; PCB copper area must be minimized to reduce EMI coupling. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and inductor; exposed tab connection enables thermal path to heatsink or internal ground plane. |
| 4 - Feedback | Regulation sense node | Internally tied to 5 V divider; not user-accessible in fixed-output version - eliminates external resistor errors and layout sensitivity. |
| 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 operation - supports microcontroller-controlled power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5 V output with no external resistors | Eliminates BOM cost, layout complexity, and temperature drift associated with feedback networks - improves long-term output stability. |
| Integrated thermal shutdown and current limit | Protects against overload, short-circuit, and ambient overheating without external sensing circuitry - ensures robust field reliability. |
| 52 kHz fixed-frequency operation | Enables predictable EMI spectrum and compatibility with standard low-cost power inductors rated for ≥50 kHz - simplifies magnetics selection. |
| TTL-compatible ON/OFF pin | Allows direct interfacing with 3.3 V or 5 V logic without level shifters - supports low-power system states and dynamic power management. |
| Moisture Sensitivity Level 1 | Zero floor-life restrictions and no bake requirement before reflow - streamlines SMT manufacturing and inventory handling. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Regulating 12 V or 24 V vehicle battery or industrial bus to clean 5 V for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled 5 V rail with fault protection. Use Value: Delivers 1.0 A at 77% efficiency from 12 V input, eliminating heatsink while meeting AEC-Q100 temperature requirements via internal thermal shutdown. |
Use Scenario: Powering MCU, EEPROM, and discrete drivers in door module or lighting control unit with intermittent load profiles. IC Role / Device Role / Timing Role: System-level 5 V regulator with ON/OFF pin synchronized to vehicle ignition state. Use Value: 80 µA standby current enables <100 µA system sleep current; fixed 5 V output avoids calibration drift in harsh thermal environments. |
| Point-of-Sale Terminal DC/DC Stage | Industrial Sensor Transmitter Supply |
Use Scenario: Converting 24 V factory floor supply to 5 V for ARM-based payment processor and display interface. IC Role / Device Role / Timing Role: High-reliability, low-component-count buck regulator supporting CE/FCC emissions compliance. Use Value: 52 kHz switching frequency simplifies EMI filter design; D2PAK package enables mechanical robustness and thermal margin in enclosed enclosures. |
Use Scenario: Generating stable 5 V from 12–36 V loop-powered or battery-operated sensor nodes (e.g., pressure, temperature). IC Role / Device Role / Timing Role: Primary regulation stage preceding precision analog front-end and ADC reference. Use Value: ±4% output tolerance ensures consistent sensor excitation and reference accuracy across full industrial temperature range (−40°C to +125°C). |
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-5G | TO-220 package (Case 314D), higher RJA (65°C/W), same electrical specs | Better suited for prototyping or low-volume assemblies with vertical heatsinking; less compact than D2PAK | Select when mechanical mounting constraints favor through-hole or when legacy TO-220 footprint is required. |
| MP1584EN-LF-Z | 4.5–28 V input, 1.5 A output, 1.5 MHz switching, adjustable only, smaller SO-8 package | Higher frequency enables smaller passive components but increases EMI sensitivity and reduces efficiency at high input voltages | Prefer for space-constrained designs with <28 V input and where adjustable output or higher switching frequency justifies redesign effort. |
Compared with LM2575T-5G, the LM2575D2T-5G offers lower thermal resistance and surface-mount compatibility; compared with MP1584EN-LF-Z, it provides wider input range, fixed 5 V simplicity, and proven ruggedness in high-noise industrial environments - making it optimal for cost-sensitive, thermally demanding 5 V buck applications.
Availability
LM2575D2T-5G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and point-of-sale terminal power supplies requiring stable component supply, long lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575D2T-5G 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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a robust, low-component-count buck regulator family targeting cost-sensitive industrial and automotive applications where reliability, thermal resilience, and ease of implementation outweigh ultra-high efficiency or miniaturization demands.
FAQ
What is the maximum input voltage rating for the LM2575D2T-5G?
The LM2575D2T-5G has an absolute maximum input voltage rating of 45 V, with recommended operating input range of 4.75 V to 40 V. Exceeding 45 V risks permanent damage to the internal NPN switch and control circuitry, as specified in the Absolute Maximum Ratings table of the official datasheet.
Does the LM2575D2T-5G require external feedback resistors to set the output voltage?
No - the LM2575D2T-5G is the fixed 5.0 V output variant, with internal resistor divider network permanently configured for 5 V regulation. Unlike the adjustable LM2575ADJ, it does not require external R1/R2 resistors, simplifying design and improving output accuracy and temperature stability.
Can the LM2575D2T-5G operate without a heatsink?
Yes, the LM2575D2T-5G can operate without an external heatsink under typical conditions: at 12 V input, 5 V/1.0 A output, and 25°C ambient, its power dissipation (~0.7 W) and low RJC (5.0°C/W) allow safe junction temperatures. However, heatsinking is recommended for sustained 1 A loads above 40°C ambient or with >24 V input.
What is the purpose of the ON/OFF pin (Pin 5) on the LM2575D2T-5G?
The ON/OFF pin (Pin 5) provides TTL-compatible enable/disable control: applying ≥2.2 V disables the regulator, reducing total input current to ~80 µA; applying ≤1.2 V enables normal operation. This feature supports power sequencing, low-power sleep modes, and system-level fault recovery in the LM2575D2T-5G.
Is the LM2575D2T-5G pin-compatible with other LM2575 variants like the LM2575T-5G?
No - the LM2575D2T-5G uses a D2PAK (TO-263) package with 5 leads and exposed thermal tab, while the LM2575T-5G uses TO-220 (Case 314D) with different lead spacing and thermal pad configuration. Though functionally identical, they are not mechanically or layout-compatible; PCB redesign is required for substitution.
LM2575D2T-5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- 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-5G FAQ
1.How can I place an order for LM2575D2T-5G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-5G 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-5G reliable?
The price and inventory of LM2575D2T-5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-5G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-5G?
LM2575D2T-5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-5G 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-5G?
For technical support, including LM2575D2T-5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-5G requirements.
6.How does Aetrix verify that LM2575D2T-5G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-5G 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-5G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-5G?
All LM2575D2T-5G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-5G, 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-5G part is unused and in its original packaging.
Return procedure for LM2575D2T-5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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