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Texas Instruments LM2575HVT-3.3
- Part No.:
- LM2575HVT-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2575HVT-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
LM2575HVT-3.3 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 3.3V output, 60V maximum input voltage rating, 52 kHz internal oscillator, and thermal shutdown/current limit protection. It drives 1A loads with ±4% output voltage tolerance across 4.75–60V input and 0.2–1A load conditions, used in industrial power supplies and embedded system pre-regulation.
For engineers reviewing the LM2575HVT-3.3 datasheet, LM2575HVT-3.3 pinout, LM2575HVT-3.3 application, or LM2575HVT-3.3 equivalent, key selection criteria include high-voltage input capability (60V), TO-220 package thermal performance (θJA = 45°C/W with 4 in² copper), fixed-output simplicity, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575HVT-3.3 integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single TO-220 package. Its fixed-frequency (52 kHz) current-mode architecture enables stable regulation without external compensation while supporting wide input range operation.
It uses cycle-by-cycle current limiting and thermal shutdown for fault protection, and features TTL-compatible ON/OFF control with 50 μA standby current. The device operates over −40°C to +125°C junction temperature and requires only four external components: input capacitor, output capacitor, catch diode, and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 4.75–60V input and 0.2–1A load - ensures stable logic supply under wide-line and load variation. |
| Max Input Voltage | 60V - supports 48V industrial bus, automotive cold-crank, and high-voltage DC distribution systems. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs without external pass devices. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 75% at 12VIN/1A - minimizes heat generation compared to linear regulators, reducing or eliminating need for heatsinks. |
| Standby Current | 50 μA typical - enables low-power shutdown mode for battery-backed or energy-sensitive applications. |
| Thermal Resistance | θJA = 45°C/W (with 4 in² PCB copper) - defines achievable power dissipation limit (≈1.1W) before thermal shutdown triggers. |
Pinout & Package
LM2575HVT-3.3 is housed in a 5-lead TO-220 package (package number NDH0005D) with exposed tab electrically connected to Pin 2 (Output). The tab serves as primary thermal path and must be soldered to ≥4 in² of PCB copper for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 4.75–60V; requires local 100 μF/75V aluminum electrolytic bypass capacitor. |
| 2 - Output | Regulated 3.3V switching node | Drives inductor and output capacitor; tab connection provides thermal conduction path to PCB. |
| 3 - Ground | Power and signal reference | Must be connected to low-impedance ground plane; shared with input/output capacitor grounds per layout guidelines. |
| 4 - Feedback | Output voltage sensing | Internally tied to 3.3V divider; not accessible - fixed-output version has no external feedback network. |
| 5 - ON/OFF | TTL-compatible enable control | Logic high (>2.2V) enables regulation; logic low (<0.8V) disables output and reduces quiescent current to 50 μA. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input support | 60V max input enables direct interface with 48V telecom, industrial, and automotive systems without pre-scaling. |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or ambient overheating. |
| Minimal external parts | Only four components required - simplifies BOM, reduces layout area, and improves reliability versus multi-chip solutions. |
| Standard inductor compatibility | Optimized for widely available 330 μH inductors (e.g., PE-52627), eliminating custom magnetics procurement. |
| TTL shutdown interface | 50 μA standby current and logic-level control allow seamless integration into microcontroller-managed power sequencing. |
Applications
| Industrial Power Supply | Embedded System Pre-Regulator |
|---|---|
Use Scenario: Converting 24V or 48V factory floor DC bus to clean 3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V at up to 1A with line/load regulation better than ±4%. Use Value: Eliminates need for bulky linear regulators and heatsinks while maintaining immunity to input voltage transients up to 60V. | Use Scenario: Providing stable 3.3V rail to ARM Cortex-M microcontrollers and associated peripherals in edge IoT gateways. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter operating at 52 kHz to minimize EMI and simplify filter design. Use Value: Enables reliable operation across −40°C to +85°C ambient with built-in thermal protection and low 50 μA shutdown current. |
| On-Card Switching Regulator | Positive-to-Negative Converter |
Use Scenario: Local point-of-load conversion on dense PCBs where space constraints prohibit external DC/DC modules. IC Role / Device Role / Timing Role: Monolithic buck regulator requiring only discrete inductor, diode, and two capacitors - total footprint < 1.5 cm². Use Value: Reduces solution size by >50% versus three-terminal linear regulators while improving efficiency from ~30% to 75%. | Use Scenario: Generating −3.3V rail from +12V supply for analog front-end biasing or op-amp dual supplies. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external component set as buck mode. Use Value: Leverages identical LM2575HVT-3.3 inventory for both positive and negative rails, simplifying procurement and design reuse. |
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-3.3 | 40V max input (vs. 60V); identical pinout, package, and electrical specs otherwise. | Not suitable for >40V input systems (e.g., 48V industrial buses, automotive cold-crank). | Select LM2575HVT-3.3 when input may exceed 40V; LM2575T-3.3 suffices for ≤40V applications with cost sensitivity. |
| LM2596-3.3 | Higher 3A output current, 150 kHz switching frequency, and improved efficiency (up to 92%), but requires different inductor and layout. | Supports higher load currents and tighter ripple requirements; not drop-in compatible due to different frequency and compensation. | Choose LM2596-3.3 for >1A loads or where higher efficiency/size ratio is critical; LM2575HVT-3.3 preferred for legacy designs and 60V robustness. |
Compared with LM2575T-3.3, LM2575HVT-3.3 adds 20V input headroom essential for industrial 48V systems; versus LM2596-3.3, it trades higher current and efficiency for proven 60V ruggedness and simpler 52 kHz magnetics selection.
Availability
LM2575HVT-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card switching regulators, and positive-to-negative converter designs requiring stable component supply and long-term manufacturability.
Supply support for LM2575HVT-3.3 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability power conversion ICs.
The LM2575HV product line was designed for industrial and automotive applications demanding extended input voltage range (up to 60V), robust thermal performance, and minimal external component count in fixed-output buck regulation.
FAQ
What is the maximum input voltage rating for LM2575HVT-3.3?
The LM2575HVT-3.3 supports a maximum input voltage of 60V, confirmed in the Absolute Maximum Ratings table of the official TI datasheet (SNVS106E). This exceeds the 40V limit of standard LM2575 variants and enables use in 48V industrial systems, automotive battery monitoring, and high-voltage DC distribution where transient spikes occur. Operation above 60V risks permanent damage.
Does LM2575HVT-3.3 require an external feedback resistor network?
No, LM2575HVT-3.3 does not require external feedback resistors. As a fixed-output variant, its 3.3V regulation is implemented internally - Pin 4 (Feedback) is not accessible and is pre-connected to the internal voltage divider. This eliminates tuning complexity and component count versus adjustable versions like LM2575HV-ADJ, making LM2575HVT-3.3 ideal for cost- and space-constrained applications.
What thermal performance can be expected from LM2575HVT-3.3 in a TO-220 package?
LM2575HVT-3.3 achieves θJA = 45°C/W when mounted vertically on a PCB with approximately 4 square inches of copper area surrounding its leads and tab - per TI's thermal characterization (SNVS106E, page 7). This allows ~1.1W of power dissipation before reaching 125°C junction temperature at 25°C ambient. Without adequate copper, θJA degrades to 65°C/W, limiting usable output power.
Can LM2575HVT-3.3 be used in a buck-boost (inverting) configuration?
Yes, LM2575HVT-3.3 can be configured as a positive-to-negative converter (buck-boost topology), as explicitly listed in the Applications section of the TI datasheet. The same external components - inductor, diode, and capacitors - are reused with modified connections. Output polarity reverses while maintaining 3.3V magnitude, enabling dual-rail analog circuits without adding a second regulator IC.
What is the standby current consumption of LM2575HVT-3.3 in shutdown mode?
The LM2575HVT-3.3 draws 50 μA typical standby current when the ON/OFF pin is pulled low (<0.8V), as specified in the Electrical Characteristics table (page 7, ISTBY parameter). This ultra-low quiescent current enables energy-efficient power sequencing in battery-powered or always-on systems. Maximum standby current is 500 μA across temperature and process variations.
LM2575HVT-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2575HVT-3.3 FAQ
1.How can I place an order for LM2575HVT-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVT-3.3 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 LM2575HVT-3.3 reliable?
The price and inventory of LM2575HVT-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575HVT-3.3 is usually 5 days.
3.What payment methods are accepted for LM2575HVT-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVT-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVT-3.3?
LM2575HVT-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVT-3.3 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 LM2575HVT-3.3?
For technical support, including LM2575HVT-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVT-3.3 requirements.
6.How does Aetrix verify that LM2575HVT-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2575HVT-3.3 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 LM2575HVT-3.3 meets industry standards.
7.What is the process for return or replacement of LM2575HVT-3.3?
All LM2575HVT-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVT-3.3, 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 LM2575HVT-3.3 part is unused and in its original packaging.
Return procedure for LM2575HVT-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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