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Texas Instruments LM2575HVSX-3.3/NOPB
- Part No.:
- LM2575HVSX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575HVSX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:166
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Product details
Overview
LM2575HVSX-3.3/NOPB 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 operation, ±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 LM2575HVSX-3.3/NOPB datasheet, LM2575HVSX-3.3/NOPB pinout, LM2575HVSX-3.3/NOPB application, or LM2575HVSX-3.3/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options for high-input-voltage DC-DC conversion designs.
Technical Context
The LM2575HVSX-3.3/NOPB implements a fixed-frequency PWM buck topology with internal 52 kHz oscillator, N-channel DMOS output switch, and built-in error amplifier with 1.23V reference. It operates in continuous conduction mode and supports duty cycles up to 98%, enabling regulation from 4.75V to 60V input down to stable 3.3V output.
Control logic includes TTL-compatible ON/OFF pin (1.4V VIH min, 1.2V VIL max), 50 μA standby current when disabled, and automatic foldback during overload via oscillator frequency reduction to ~18 kHz. Protection features are cycle-by-cycle current limit (1.7–3.2A peak), thermal shutdown at 150°C junction temperature, and output short-circuit robustness.
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 rail for 3.3V logic without external feedback network) |
| Input Voltage Range | 4.75V to 60V (supports wide-range industrial, automotive, and telecom inputs without pre-regulation) |
| Output Current | 1A continuous (sufficient for FPGA I/O banks, microcontroller cores, or sensor subsystems) |
| Switching Frequency | 52 kHz ±10% (enables use of low-cost, high-saturation-current inductors; reduces EMI filtering complexity vs MHz converters) |
| Efficiency | 75% at 12VIN/3.3VOUT/1A (reduces heat sink requirements versus linear regulators; enables TO-263 operation without forced air) |
| Thermal Resistance | θJA = 37°C/W (DDPAK/TO-263 package with ≥1 in² copper area; enables 1A operation at ≤70°C ambient without heatsink) |
| Shutdown Current | 50 μA typical (supports low-power system sleep modes; compatible with battery-backed applications) |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and safe short-circuit recovery (eliminates need for external fault-handling circuitry) |
Pinout & Package
LM2575HVSX-3.3/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring exposed thermal pad for enhanced heat dissipation. Pin 1 is Input, Pin 2 is Output, Pin 3 is Ground, Pin 4 is Feedback (internally tied to 3.3V output), and Pin 5 is ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage supply | Accepts 4.75–60V DC; requires local 100 μF/75V aluminum electrolytic bypass capacitor |
| Pin 2 (OUT) | Regulated output | Delivers 3.3V/1A; connects to catch diode anode and output filter inductor |
| Pin 3 (GND) | Power and signal ground | Common return for input/output capacitors, feedback network, and thermal pad; must be low-inductance connection |
| Pin 4 (FEEDBACK) | Internal voltage sense node | Internally connected to 3.3V output; no external resistor required (fixed-output configuration) |
| Pin 5 (ON/OFF) | Enable/disable control | TTL-compatible input; <1.2V disables regulator (50 μA standby); >1.4V enables normal operation |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input capability | 60V absolute maximum input enables direct connection to 48V telecom, 36V industrial, or unregulated AC/DC outputs |
| Integrated protection | Thermal shutdown + cycle-by-cycle current limit eliminate need for external current-sense resistors or thermal sensors |
| Minimal external parts | Only four components required: input cap, output cap, catch diode, and inductor - simplifies BOM and layout |
| Standard inductor compatibility | Optimized for off-the-shelf 330 μH inductors (e.g., Pulse PE-52627), reducing design iteration time |
| Low-ESR capacitor support | Stable with standard aluminum electrolytics (no requirement for expensive polymer or tantalum types) |
| TTL shutdown interface | Direct connection to microcontroller GPIO without level-shifting; 50 μA standby current preserves battery life |
Applications
| Industrial Power Supply | Automotive Control Unit |
|---|---|
|
Use Scenario: Converting 24V vehicle battery or 48V telecom bus to clean 3.3V for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3V rail with input transient immunity up to 60V. Use Value: Eliminates need for cascaded pre-regulator + LDO; maintains regulation during cold-crank (6.5V) and load-dump (60V) events per ISO 7637-2. |
Use Scenario: Powering infotainment SoC I/O domains and sensor interfaces in engine control modules. IC Role / Device Role / Timing Role: High-reliability DC-DC converter delivering 3.3V at 1A with thermal shutdown for under-hood environments. Use Value: Operates continuously at 125°C junction temperature; withstands 150°C peak during thermal stress without latch-off. |
| Programmable Logic Controller | Remote IoT Sensor Node |
|
Use Scenario: Generating 3.3V rail from 24V DC field bus for PLC digital I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Main power stage converting wide-input industrial supply into stable logic voltage with ripple <50 mVpp. Use Value: Delivers 75% efficiency at full load, reducing board-level heat accumulation in sealed enclosures. |
Use Scenario: Battery-powered environmental sensor hub requiring ultra-low standby power and wide-input flexibility. IC Role / Device Role / Timing Role: Enable-controlled buck regulator supporting deep-sleep mode with 50 μA quiescent current. Use Value: Enables >5-year battery life in lithium-thionyl chloride systems by minimizing idle power loss. |
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 | TO-220 package; 40V max input; higher θJA (65°C/W); no exposed thermal pad | Suitable for lower-power, non-space-constrained designs with <40V input; requires heatsink above ~500 mA | Select when mechanical mounting constraints favor through-hole or when input voltage never exceeds 40V |
| LM2596SX-3.3 | Higher 3A output current; 40V max input; 150 kHz switching; improved efficiency (85% @ 12V→3.3V) | Better suited for higher-load applications or where smaller magnetics are needed; lacks 60V HV rating | Choose when >1A output or higher efficiency is required, and input stays below 40V |
Compared with LM2575HVSX-3.3/NOPB, LM2575T-3.3 trades high-voltage capability for simpler thermal management in legacy through-hole layouts, while LM2596SX-3.3 offers higher current and efficiency but sacrifices the 60V input margin critical for industrial surge immunity.
Availability
LM2575HVSX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, and programmable logic controllers requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2575HVSX-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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2575HV product line was designed specifically for industrial, automotive, and telecom applications demanding robust 60V-input DC-DC regulation with minimal external components and proven thermal resilience.
FAQ
What is the maximum input voltage rating for LM2575HVSX-3.3/NOPB?
The LM2575HVSX-3.3/NOPB supports a maximum input voltage of 60V, as specified in its Absolute Maximum Ratings and Operating Ratings. This high-voltage capability allows direct use with 48V telecom systems, 36V industrial buses, and automotive load-dump conditions without external pre-regulation. The device maintains regulation across the full 4.75V to 60V range while delivering 3.3V ±4% output accuracy.
Does LM2575HVSX-3.3/NOPB require external feedback resistors?
No, LM2575HVSX-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its internal feedback network is factory-trimmed to 3.3V, and Pin 4 (FEEDBACK) is internally connected to the output. This eliminates resistor selection, placement, and tolerance errors - reducing BOM count and improving long-term stability compared to adjustable versions like LM2575HV-ADJ.
What package type is used by LM2575HVSX-3.3/NOPB?
LM2575HVSX-3.3/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (TI package code KTT0005B), featuring an exposed thermal pad for superior heat dissipation. Its θJA is 37°C/W with ≥1 in² PCB copper area, enabling 1A continuous operation at up to 70°C ambient without a heatsink - a key advantage over TO-220 variants like LM2575T-3.3.
How does the ON/OFF pin function on LM2575HVSX-3.3/NOPB?
The ON/OFF pin (Pin 5) of LM2575HVSX-3.3/NOPB provides TTL-compatible enable control: applying <1.2V disables the regulator, reducing quiescent current to 50 μA typical; applying >1.4V enables normal operation. This allows direct interfacing with microcontroller GPIOs for power sequencing or low-power sleep modes without external level shifters or pull-up resistors.
What protection features are integrated into LM2575HVSX-3.3/NOPB?
LM2575HVSX-3.3/NOPB integrates thermal shutdown (activates at 150°C junction temperature), cycle-by-cycle current limiting (1.7–3.2A peak), and safe short-circuit recovery. Unlike many buck controllers, it does not require external current-sense resistors or thermal sensors. These protections operate autonomously and restore normal regulation after fault clearance - enhancing system reliability in harsh environments.
LM2575HVSX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2575HVSX-3.3/NOPB FAQ
1.How can I place an order for LM2575HVSX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVSX-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 LM2575HVSX-3.3/NOPB reliable?
The price and inventory of LM2575HVSX-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 LM2575HVSX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575HVSX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVSX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVSX-3.3/NOPB?
LM2575HVSX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVSX-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 LM2575HVSX-3.3/NOPB?
For technical support, including LM2575HVSX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVSX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2575HVSX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575HVSX-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 LM2575HVSX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575HVSX-3.3/NOPB?
All LM2575HVSX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVSX-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 LM2575HVSX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2575HVSX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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