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Texas Instruments LM2575HVT-3.3/LF03
- Part No.:
- LM2575HVT-3.3/LF03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575HVT-3.3/LF03.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,120
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Product details
Overview
LM2575HVT-3.3/LF03 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 fixed-frequency internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575HVT-3.3/LF03 datasheet, LM2575HVT-3.3/LF03 pinout, LM2575HVT-3.3/LF03 application, or LM2575HVT-3.3/LF03 equivalent, key selection criteria include its HV input capability (up to 60V), TO-220-5 package thermal performance (θJA = 45°C/W with 4 in² copper), 1A continuous output, TTL-compatible shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575HVT-3.3/LF03 implements a fixed-frequency pulse-width modulation (PWM) buck topology with an integrated N-channel DMOS power switch, internal frequency compensation, and a precision 1.23V feedback reference. Its control loop maintains regulation across 4.75V–60V input while delivering up to 1A at 3.3V with ≤±4% total output error.
It features cycle-by-cycle current limiting (1.7–3.2A peak), thermal shutdown at ~150°C junction temperature, and TTL-level ON/OFF control with 50μA standby current. The device operates in continuous conduction mode (CCM) and supports simple layout with 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, 0.2–1A load, −40°C to +125°C |
| Input Voltage Range | 4.75V to 60V - enables direct regulation from 48V telecom, 36V industrial, or unregulated AC/DC rails |
| Output Current | 1A continuous - sufficient for powering microcontrollers, FPGAs, and interface ICs without external pass devices |
| Switching Frequency | 52 kHz fixed - allows use of low-cost, high-saturation-current toroidal inductors (e.g., PE-52627) |
| Efficiency | 75% at 12VIN/3.3VOUT/1A - reduces thermal load vs. linear regulators; no heatsink required with proper PCB copper |
| Shutdown Current | 50 μA typical - enables low-power standby modes in battery-backed or energy-sensitive systems |
| Thermal Resistance | θJA = 45°C/W (TO-220-5, 4 in² copper) - supports 1A operation at ambient up to +85°C without forced air |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and safe short-circuit recovery - eliminates need for external fault management circuitry |
Pinout & Package
LM2575HVT-3.3/LF03 is housed in a 5-lead TO-220 package (package code NDH0005D) with exposed tab electrically connected to Pin 2 (Output). The package supports vertical mounting with ½-inch leads soldered to PCB copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Main power input | Accepts 4.75–60V DC; requires local 100 μF/75V aluminum electrolytic bypass |
| 2 - Output | Regulated output & thermal pad | Delivers 3.3V/1A; tab must be soldered to ≥4 in² copper pour for θJA = 45°C/W |
| 3 - Ground | Power and signal reference | Single-point ground connection required; ties to input/output capacitor negatives and feedback network |
| 4 - Feedback | Voltage sense input | Internally referenced to 1.23V; unused in fixed-output versions (internally tied to output) |
| 5 - ON/OFF | TTL-compatible enable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces IQ to 50 μA |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input support | 60V max input enables single-stage conversion from 48V systems without pre-regulation |
| Minimal external parts count | Only 4 components required: input cap, output cap, Schottky catch diode, and inductor - accelerates design and reduces BOM cost |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or thermal runaway |
| TTL-compatible shutdown | 50 μA standby current and clean output disable allow seamless integration into microcontroller-controlled power sequencing |
| Standard inductor compatibility | Optimized for widely available 330 μH inductors (e.g., PE-52627) - avoids custom magnetics and supply-chain risk |
| Precision output tolerance | ±4% over full line/load/temperature ensures reliable operation of 3.3V logic without post-regulation LDOs |
Applications
| Industrial Power Supplies | Telecom Line Cards |
|---|---|
|
Use Scenario: Converting 48V backplane voltage to 3.3V for FPGA configuration and peripheral interfaces in modular telecom equipment. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3V rail with fast transient response to digital load steps. Use Value: Eliminates need for inefficient two-stage conversion (48V → 5V → 3.3V); achieves >75% efficiency at full load with no heatsink. |
Use Scenario: Generating stable 3.3V for Ethernet PHYs, SFP modules, and control logic on carrier-grade line cards operating in extended temperature environments. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with built-in thermal and overcurrent protection for unattended field deployment. Use Value: Withstands 60V input surges per GR-1089 and maintains ±4% regulation across −40°C to +85°C ambient. |
| On-Board Embedded Systems | Efficient Pre-Regulator for Linear Regulators |
|
Use Scenario: Providing primary 3.3V rail for ARM Cortex-M7 microcontrollers, ADCs, and communication peripherals in factory automation controllers. IC Role / Device Role / Timing Role: Main system power regulator with TTL shutdown enabling coordinated power-down sequences via MCU GPIO. Use Value: Reduces board heat by >60% versus LM317-based solutions; simplifies thermal design with TO-220-5 package and 45°C/W θJA. |
Use Scenario: Stepping down 24V industrial bus to ~4.5V before feeding low-noise LDOs for analog sensor front-ends or RF sections. IC Role / Device Role / Timing Role: High-efficiency pre-regulator minimizing power loss upstream of noise-sensitive linear regulators. Use Value: Delivers 1A at 75–88% efficiency depending on input, reducing LDO thermal stress and enabling smaller LDO packages. |
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), same TO-220-5 package, identical pinout and electrical specs except input rating | Suitable for 24V or lower input systems; not rated for 48V telecom or industrial transients | Select LM2575T-3.3 only when input never exceeds 40V; LM2575HVT-3.3/LF03 provides margin for surge immunity and future-proofing. |
| LM2596S-3.3 | Higher 63V input rating, 150 kHz switching, adjustable soft-start, but requires external compensation and has different pinout | Better ripple/noise performance and higher efficiency at light loads; not drop-in compatible due to different footprint and control scheme | Choose LM2596S-3.3 for new designs prioritizing EMI reduction and tighter load regulation; LM2575HVT-3.3/LF03 offers proven simplicity and legacy design continuity. |
Compared with LM2575T-3.3, LM2575HVT-3.3/LF03 adds 20V input headroom critical for 48V systems, while LM2596S-3.3 trades ease-of-use for higher frequency and improved light-load behavior - making LM2575HVT-3.3/LF03 optimal for rugged, cost-sensitive industrial buck conversion where layout simplicity and surge robustness are paramount.
Availability
LM2575HVT-3.3/LF03 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, embedded control units, and factory automation systems requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2575HVT-3.3/LF03 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 expertise in high-reliability power conversion ICs.
The LM2575HV product line was designed specifically for industrial and telecom applications demanding wide-input-voltage buck regulation with minimal external components and robust fault protection - targeting replacement of linear regulators in space- and thermally-constrained environments.
FAQ
What is the maximum input voltage rating for LM2575HVT-3.3/LF03?
The LM2575HVT-3.3/LF03 supports a maximum input voltage of 60V, confirmed in the Absolute Maximum Ratings table of the official TI datasheet (SNVS106E). This HV rating distinguishes it from the standard LM2575 series (40V max) and enables direct regulation from 48V telecom or industrial bus voltages without pre-regulation stages. Operation above 60V risks permanent damage.
Does LM2575HVT-3.3/LF03 require an external feedback resistor network?
No, LM2575HVT-3.3/LF03 does not require external feedback resistors. As a fixed-output version, its feedback node (Pin 4) is internally connected to the output, eliminating the need for R1/R2 divider networks. This simplifies layout and improves stability versus adjustable variants - a key design advantage confirmed in the "Fixed Output Voltage Versions" application diagram (Figure 25) of the TI datasheet.
What thermal performance can be expected from LM2575HVT-3.3/LF03 in a TO-220-5 package?
When mounted vertically with ½-inch leads soldered to approximately 4 square inches of PCB copper, LM2575HVT-3.3/LF03 achieves θJA = 45°C/W (per datasheet Section 6.5). This allows full 1A output at ambient temperatures up to +85°C without forced airflow or external heatsinks - a critical advantage over standard TO-220 variants with θJA = 65°C/W.
Can LM2575HVT-3.3/LF03 be used in synchronous rectification configurations?
No, LM2575HVT-3.3/LF03 is not designed for synchronous rectification. It integrates a single N-channel DMOS power switch and requires an external Schottky catch diode (e.g., SR103 or MBR340) as specified in Figure 25 of the TI datasheet. The controller lacks gate-drive outputs for a second MOSFET, and its architecture is optimized for diode-based asynchronous operation.
What is the standby current consumption of LM2575HVT-3.3/LF03 during shutdown?
LM2575HVT-3.3/LF03 draws 50 μA typical quiescent current when the ON/OFF pin (Pin 5) is pulled low (<0.8V), as specified in the Electrical Characteristics table (ISTBY parameter). This ultra-low standby current enables energy-efficient power sequencing in battery-backed or always-on systems - verified across temperature and process corners in TI's production test flow.
LM2575HVT-3.3/LF03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- 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/LF03 FAQ
1.How can I place an order for LM2575HVT-3.3/LF03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVT-3.3/LF03 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/LF03 reliable?
The price and inventory of LM2575HVT-3.3/LF03 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/LF03 is usually 5 days.
3.What payment methods are accepted for LM2575HVT-3.3/LF03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVT-3.3/LF03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVT-3.3/LF03?
LM2575HVT-3.3/LF03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVT-3.3/LF03 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/LF03?
For technical support, including LM2575HVT-3.3/LF03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVT-3.3/LF03 requirements.
6.How does Aetrix verify that LM2575HVT-3.3/LF03 is sourced from the original manufacturer or authorized distributors?
All LM2575HVT-3.3/LF03 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/LF03 meets industry standards.
7.What is the process for return or replacement of LM2575HVT-3.3/LF03?
All LM2575HVT-3.3/LF03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVT-3.3/LF03, 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/LF03 part is unused and in its original packaging.
Return procedure for LM2575HVT-3.3/LF03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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