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Texas Instruments LM2575HVT-3.3/NOPB
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- Part No.:
- LM2575HVT-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2575HVT-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:269
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Product details
Overview
LM2575HVT-3.3/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, delivering a fixed 3.3V output with ±4% tolerance across 4.75–60V input range, 0.2–1A load, and −40°C to +125°C junction temperature. It integrates oscillator, PWM controller, and 3.3V reference for compact, heat-sink-free power conversion in industrial and embedded systems.
For engineers reviewing the LM2575HVT-3.3/NOPB datasheet, LM2575HVT-3.3/NOPB pinout, LM2575HVT-3.3/NOPB application, or LM2575HVT-3.3/NOPB equivalent, key selection factors include its 60V max input rating, 52 kHz fixed-frequency operation, TTL shutdown capability, thermal/current protection, and compatibility with standard off-the-shelf inductors - critical for robust DC/DC design in high-input-voltage environments.
Technical Context
The LM2575HVT-3.3/NOPB implements a current-mode controlled buck topology with internal 52 kHz oscillator, cycle-by-cycle current limiting, and thermal shutdown. Its feedback loop uses a precision 1.23V reference and requires no external compensation due to integrated frequency compensation.
It operates in continuous conduction mode (CCM) with up to 98% duty cycle, enabling low-dropout operation down to ~4.75V input for 3.3V output. The HV variant supports 60V maximum input voltage - 20V higher than standard LM2575 - making it suitable for unregulated 48V rail and automotive battery-supplied applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full operating range (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 or 36V industrial rails without pre-regulation |
| Output Current | 1A continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs without external pass devices |
| Switching Frequency | 52 kHz fixed - simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors |
| Efficiency | 75% at 12VIN/3.3VOUT/1A - reduces thermal load vs. linear regulators; no heatsink required under typical conditions |
| Shutdown Current | 50 μA typical - enables ultra-low-power standby in battery-backed or energy-sensitive systems |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents latch-up during overload or poor heatsinking |
Pinout & Package
LM2575HVT-3.3/NOPB is housed in a 5-lead TO-220 package (Package Number NDH0005D), with the tab electrically connected to Pin 2 (Output) and thermally coupled to the PCB copper for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Voltage supply input | Accepts 4.75–60V; requires local 100 μF/75V aluminum electrolytic bypass capacitor |
| 2 - Output | Regulated 3.3V output & power switch source | Connected to inductor and output capacitor; tab is internally tied to this pin for thermal conduction |
| 3 - Ground | Power and signal reference | Single-point ground connection essential for noise immunity and stable regulation |
| 4 - Feedback | Output voltage sensing node | Internally tied to 3.3V output; not accessible - fixed-output version has internal resistor divider |
| 5 - ON/OFF | TTL-compatible enable/disable 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 absolute max input - eliminates need for external pre-regulator in 48V systems |
| Integrated Protection | Cycle-by-cycle current limit + thermal shutdown - ensures safe operation under short-circuit or overtemperature |
| Minimal External Components | Only 4 components required: input cap, output cap, inductor, catch diode - accelerates layout and validation |
| TTL-Compatible Shutdown | 50 μA standby current with logic-level control - enables system-level power sequencing and low-power sleep modes |
| Standard Inductor Compatibility | Optimized for common 330 μH inductors (e.g., PE-52627) - avoids custom magnetics and reduces BOM cost |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Converting 24–48V vehicle battery or factory bus to stable 3.3V for MCU and sensors. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3V rail with transient resilience. Use Value: 60V input rating withstands load-dump transients; thermal shutdown prevents failure during under-hood overheating. |
Use Scenario: Powering CAN transceivers, LIN nodes, and microcontrollers in door modules or lighting ECUs. IC Role / Device Role / Timing Role: On-board DC/DC converter replacing linear regulators to reduce heat and improve efficiency. Use Value: 75% efficiency at 1A cuts power loss by >2W vs. LDO; TTL shutdown enables deep-sleep current reduction. |
| Telecom Line Cards | Programmable Logic Controllers (PLCs) |
|
Use Scenario: Generating 3.3V from -48V nominal telecom supply (with appropriate input polarity handling). IC Role / Device Role / Timing Role: Pre-regulator stage feeding downstream point-of-load converters or LDOs. Use Value: Wide input range accommodates -48V ±15% variation and surge conditions; fixed 3.3V output simplifies downstream design. |
Use Scenario: Providing reliable 3.3V for FPGA configuration, I/O drivers, and real-time controllers in harsh factory environments. IC Role / Device Role / Timing Role: Main system regulator with fault tolerance for continuous operation in industrial settings. Use Value: Internal current limiting and thermal protection ensure uptime during motor startup surges or ambient temperature spikes. |
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/NOPB | Max input voltage 40V (vs. 60V); same pinout, package, and 3.3V output spec | Not suitable for 48V+ input rails or load-dump tolerant designs | Select only when input stays ≤40V and cost sensitivity outweighs HV margin |
| LM2596S-3.3 | Higher 3A output current, 150 kHz switching, SO-8 package; no built-in thermal shutdown | Requires external thermal management; better for higher-current, space-constrained layouts | Choose when >1A load or smaller footprint is needed, and board-level thermal design is feasible |
Compared with LM2575T-3.3/NOPB, LM2575HVT-3.3/NOPB adds 20V input headroom critical for 48V systems; versus LM2596S-3.3, it trades current capacity and frequency for integrated protection and proven reliability in legacy industrial designs.
Availability
LM2575HVT-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2575HVT-3.3/NOPB 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 series was designed specifically for ruggedized DC/DC conversion in high-input-voltage environments - targeting industrial, automotive, and telecom applications where input transients, wide voltage ranges, and long-term stability are mandatory.
FAQ
What is the maximum input voltage rating for LM2575HVT-3.3/NOPB?
The LM2575HVT-3.3/NOPB supports a maximum input voltage of 60V, confirmed in the Absolute Maximum Ratings table of the official TI datasheet (SNVS106E). This distinguishes it from the standard LM2575 (40V max) and enables direct regulation from 48V systems, including those subject to load-dump transients. Operation above 60V risks permanent damage.
Does LM2575HVT-3.3/NOPB require external compensation components?
No, LM2575HVT-3.3/NOPB includes internal frequency compensation and is designed for stable operation with only four external components: input capacitor, output capacitor, inductor, and catch diode. The fixed-output architecture eliminates the need for external feedback resistors or compensation networks - verified in the Typical Application schematic (Figure 25) and Block Diagram section of the TI datasheet.
Can LM2575HVT-3.3/NOPB be used in adjustable-output configurations?
No, LM2575HVT-3.3/NOPB is a fixed-output variant with internal 3.3V feedback divider. It does not expose the feedback pin (Pin 4 is internally connected), unlike the LM2575HV-ADJ version. Attempting to modify output voltage externally will not function and may violate specifications. For adjustable output, select LM2575HV-ADJ/NOPB instead.
What thermal performance can be expected from LM2575HVT-3.3/NOPB in a TO-220 package?
In a standard TO-220 mount with ~4 in² copper area, LM2575HVT-3.3/NOPB achieves θJA = 45°C/W (per datasheet Section 6.5). At 1A output and 12V input, typical power dissipation is ~1.8W, resulting in ~81°C junction rise above ambient - well within the 125°C max TJ limit. No external heatsink is required under these conditions.
Is LM2575HVT-3.3/NOPB RoHS compliant and lead-free?
Yes, LM2575HVT-3.3/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' part numbering convention. TI's official product folder and packaging documentation confirm Pb-free matte tin lead finish and compliance with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609.
LM2575HVT-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- 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):
- 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/NOPB FAQ
1.How can I place an order for LM2575HVT-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVT-3.3/NOPB 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/NOPB reliable?
The price and inventory of LM2575HVT-3.3/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575HVT-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVT-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVT-3.3/NOPB?
LM2575HVT-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVT-3.3/NOPB 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/NOPB?
For technical support, including LM2575HVT-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVT-3.3/NOPB requirements.
6.How does Aetrix verify that LM2575HVT-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575HVT-3.3/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575HVT-3.3/NOPB?
All LM2575HVT-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVT-3.3/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM2575HVT-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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