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onsemi LM2575T-5G
- Part No.:
- LM2575T-5G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-5G.pdf
- Description:
- IC REG BUCK 5V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:385
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Product details
Overview
LM2575T-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% output voltage tolerance over line and load, 52 kHz internal oscillator, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 8.0 V to 40 V input and is widely used in industrial power supplies and embedded system pre-regulation.
For engineers reviewing the LM2575T-5G datasheet, pinout, applications, or equivalent options, this page delivers verified specifications, validated pin functions, confirmed thermal and protection behavior, and real-world design context for reliable integration into DC-DC buck converter circuits.
Technical Context
The LM2575T-5G implements a voltage-mode controlled buck topology with an internal 1.0 A NPN switch, fixed 52 kHz oscillator, and 1.23 V bandgap reference feeding an error amplifier. Its feedback loop is internally configured for 5.0 V output-no external resistors required-unlike the adjustable version.
It features TTL-compatible ON/OFF control (1.4 V typical threshold), 80 µA standby quiescent current, and self-protecting behaviors: thermal shutdown triggers at ~150°C junction temperature, while overload reduces oscillator frequency to ~18 kHz to limit average power dissipation.
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 8.0–40 V input - ensures stable logic supply without trimming. |
| Max Output Current | 1.0 A continuous - supports moderate-power microcontrollers, sensors, and peripheral rails without external boost stages. |
| Input Voltage Range | 8.0 V to 40 V - accommodates 12 V/24 V industrial buses and automotive battery variations (with external transient suppression). |
| 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) and simplifies EMI filtering. |
| Efficiency | 77% typical at 12 VIN, 1.0 A, 5 VOUT - significantly exceeds linear regulators under same conditions, reducing thermal load. |
| Quiescent Current | 5.0 mA typical (11 mA max over temp) - enables low-noise operation in always-on subsystems without excessive idle loss. |
| Standby Current | 80 µA typical when ON/OFF pin ≥2.4 V - allows microcontroller-controlled power gating with negligible battery drain. |
Pinout & Package
LM2575T-5G uses the TO-220-5 (Case 314D) package with heatsink surface electrically connected to Pin 3 (GND). The exposed tab provides low thermal resistance (RJC = 5.0°C/W) and must be mounted to a heatsink or copper pour for >0.5 A continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 8.0–40 V unregulated DC; requires local 100 µF/50 V electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5.0 V; saturation voltage ≤1.2 V at 1.0 A - dictates minimum dropout and conduction loss. |
| 3 - GND | Circuit ground reference | Common return for input cap, output cap, catch diode cathode, and heatsink; single-point grounding critical for stability. |
| 4 - Feedback | Internal voltage sense node | Internally tied to 5.0 V divider - no external connection needed; floating or miswiring causes regulation failure. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.4 V) disables regulator, dropping input current to ~80 µA; logic-low (<1.0 V) enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity versus adjustable versions. |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during short-circuit or overload events without external circuitry. |
| Low-component design | Requires only four external parts: input cap, output cap, catch diode (e.g., 1N5819), and inductor - accelerates prototyping. |
| High efficiency at medium loads | 77% typical at full 1.0 A load enables compact thermal design vs. linear regulators, especially with >12 V input. |
| TTL shutdown interface | Direct compatibility with 3.3 V/5 V microcontrollers for power sequencing and sleep-mode control without level-shifting. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Providing clean 5 V rail from noisy 24 V factory bus to PLC I/O modules. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator converting unregulated 24 V to isolated 5 V logic supply. Use Value: Delivers 1.0 A with <±4% regulation despite input ripple and load steps, eliminating need for post-LDO filtering. |
Use Scenario: Generating 5 V intermediate rail for MCU core and peripherals from higher-voltage battery pack. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping down 12–36 V battery voltage before low-noise LDOs. Use Value: 77% efficiency at 1 A reduces heat rise in sealed enclosures, extending battery runtime vs. linear solutions. |
| On-Card Switching Regulator | Power Supply for Battery Chargers |
|
Use Scenario: Local 5 V generation on motor drive PCB where space prohibits external AC-DC adapter. IC Role / Device Role / Timing Role: Compact, self-contained buck converter with minimal external footprint (TO-220 + 4 passives). Use Value: TO-220 package allows direct heatsinking to chassis, enabling 1 A output in <2 cm² board area. |
Use Scenario: Charging circuit for 3S Li-ion pack requiring regulated 5 V auxiliary rail for fuel gauge and USB interface. IC Role / Device Role / Timing Role: Dedicated 5 V supply independent of main charging path, ensuring stable communication during charge cycles. Use Value: 80 µA shutdown current prevents parasitic drain when charger is off, preserving battery state-of-charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVT-5G | Wider input range (4.75–60 V) and higher junction temperature rating (150°C); otherwise identical pinout, function, and specs. | Suitable for 48 V telecom or automotive cold-crank scenarios where input may exceed 40 V. | Select when input voltage can transiently exceed 40 V or ambient temperature exceeds 125°C. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but requires external compensation and lacks integrated thermal foldback. | Better suited for space-constrained designs needing sub-1 mm height; less robust under sustained overload. | Choose for compact portable devices; avoid in high-reliability industrial systems where LM2575T-5G's proven fault protection is critical. |
Compared with LM2575HVT-5G, the LM2575T-5G trades input voltage headroom for cost and legacy design compatibility; compared with MP1584EN-LF-Z, it prioritizes ruggedness and simplicity over miniaturization-making it ideal for fixed-output, thermally demanding, or long-lifecycle applications.
Availability
LM2575T-5G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and on-card switching regulators requiring stable component supply, long-term lifecycle support, and proven thermal reliability.
Supply support for LM2575T-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 focused on energy-efficient power management, analog, and sensor technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a rugged, low-component-count buck regulator family for cost-sensitive industrial and embedded applications where reliability, thermal resilience, and ease of design outweigh ultra-high frequency or ultra-small size requirements.
FAQ
What is the maximum input voltage for the LM2575T-5G?
The absolute maximum input voltage for the LM2575T-5G is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating the guaranteed performance limits, particularly under high-temperature conditions. For designs requiring >40 V input, the LM2575HVT-5G variant (60 V max) is the appropriate alternative. The LM2575T-5G itself must remain within 8.0–40 V for full specification compliance.
Does the LM2575T-5G require external feedback resistors?
No, the LM2575T-5G does not require external feedback resistors. It is a fixed-output version with internal resistor division set for 5.0 V, and Pin 4 (Feedback) is internally connected - leaving it unconnected or tying it externally will disrupt regulation. This distinguishes it from the LM2575ADJ, which relies on external R1/R2 for output programming. The LM2575T-5G's design eliminates tuning complexity and improves stability by removing external feedback path sensitivity.
Can the LM2575T-5G be used without a heatsink?
The LM2575T-5G can operate without an external heatsink at light loads (<300 mA) and ambient temperatures <50°C, thanks to its 65°C/W junction-to-ambient thermal resistance in TO-220-5 package. However, at full 1.0 A load with 24 V input, power dissipation exceeds 1.5 W - requiring a heatsink or substantial copper pour to maintain junction temperature below 125°C. Thermal shutdown activates at ~150°C, so derating is essential for continuous operation. The LM2575T-5G's GND-connected tab must be soldered to thermal plane for effective conduction.
What diode is recommended for use with the LM2575T-5G?
The datasheet specifies the 1N5819 Schottky diode as the standard catch diode for the LM2575T-5G in typical applications. It offers 1.0 A average current rating, 40 V reverse voltage, and low forward voltage (~0.45 V), minimizing conduction loss and improving efficiency. For higher reliability or elevated temperature operation, alternatives like MBR140 or SB140 are acceptable. The LM2575T-5G's internal switch timing and voltage stress profile are validated with this diode type - substituting slower or higher-VF diodes degrades efficiency and may cause instability.
How does the ON/OFF pin function on the LM2575T-5G?
The ON/OFF pin (Pin 5) of the LM2575T-5G enables logic-level shutdown: applying ≥2.4 V disables the internal switch, reducing total input current to ~80 µA; applying ≤1.0 V enables normal regulation. The threshold is TTL-compatible and does not require pull-up/down resistors. This feature allows precise power sequencing in multi-rail systems and zero-load battery preservation. Unlike enable pins on newer regulators, the LM2575T-5G's ON/OFF pin directly gates the oscillator - making it fully compatible with microcontroller GPIOs without additional drivers.
LM2575T-5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2575T-5G FAQ
1.How can I place an order for LM2575T-5G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-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 LM2575T-5G reliable?
The price and inventory of LM2575T-5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-5G is usually 5 days.
3.What payment methods are accepted for LM2575T-5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-5G?
LM2575T-5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-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 LM2575T-5G?
For technical support, including LM2575T-5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-5G requirements.
6.How does Aetrix verify that LM2575T-5G is sourced from the original manufacturer or authorized distributors?
All LM2575T-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 LM2575T-5G meets industry standards.
7.What is the process for return or replacement of LM2575T-5G?
All LM2575T-5G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-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 LM2575T-5G part is unused and in its original packaging.
Return procedure for LM2575T-5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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