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Texas Instruments LM2575HVSX-3.3
- Part No.:
- LM2575HVSX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575HVSX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,813
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Product details
Overview
LM2575HVSX-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 fixed-frequency internal oscillator, and integrated thermal shutdown and cycle-by-cycle current limiting. It delivers ±4% output voltage accuracy across 4.75–60V input and 0.2–1A load, enabling compact, high-efficiency DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2575HVSX-3.3 datasheet, LM2575HVSX-3.3 pinout, LM2575HVSX-3.3 application, or LM2575HVSX-3.3 equivalent, key selection considerations include its HV-rated input range, TO-263 (DDPAK) package thermal performance (θJA = 37°C/W with 1 in² copper), 1.23V feedback reference, and compatibility with standard off-the-shelf inductors and Schottky catch diodes.
Technical Context
The LM2575HVSX-3.3 implements a fixed-frequency pulse-width modulation (PWM) buck topology with internal NPN switch, requiring only four external components: input capacitor, output capacitor, catch diode, and power inductor. Its 52 kHz oscillator enables predictable EMI filtering and eliminates need for external timing components.
Control architecture includes voltage-mode feedback via an internal 1.23V reference, cycle-by-cycle peak current limiting (1.7–3.2A), and thermal shutdown at 150°C junction temperature. The ON/OFF pin supports TTL-compatible shutdown with 50 μA standby current, enabling low-power system management.
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 rail generation without trimming resistors. |
| Max Input Voltage | 60V - supports wide-input industrial, automotive, and telecom applications without external pre-regulation. |
| Output Current | 1A continuous - sufficient to power microcontrollers, FPGAs, and peripheral ICs directly. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and simplifies EMI filter design. |
| Efficiency | 75% at 12VIN/1A - reduces thermal load vs. linear regulators; no heatsink required under typical conditions. |
| Thermal Resistance | θJA = 37°C/W (with 1 in² PCB copper) - enables high-power density layouts in space-constrained designs. |
| Standby Current | 50 μA typical - allows deep sleep modes in battery-backed or energy-sensitive systems. |
Pinout & Package
LM2575HVSX-3.3 is housed in a 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring exposed thermal pad for enhanced heat dissipation. Pin 1 is VIN, Pin 2 is OUTPUT, Pin 3 is GND, Pin 4 is FEEDBACK (not connected in fixed-output versions), and Pin 5 is ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 4.75–60V DC; requires local 100 μF/75V aluminum electrolytic bypass capacitor. |
| 2 (OUTPUT) | Switched output node | Drives inductor and catch diode; connects to output filter capacitor and load; carries pulsed 1A current. |
| 3 (GND) | Power and signal ground | Common return for internal circuitry, switch emitter, and external components; must be low-inductance connection. |
| 4 (FEEDBACK) | Voltage sense input | Internally tied to 3.3V output; left unconnected in fixed-output variants - not used for regulation. |
| 5 (ON/OFF) | Enable/disable control | TTL-compatible shutdown: <0.8V = OFF (50 μA IQ), >2.2V = ON; open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Protects against sustained overload or poor heatsinking by disabling switch above 150°C junction temperature. |
| Cycle-by-cycle current limit | Prevents MOSFET failure during short-circuit or startup by clamping peak switch current to 1.7–3.2A. |
| Fixed 52 kHz oscillator | Eliminates external timing components and ensures consistent switching behavior across temperature and voltage. |
| TTL-compatible enable | Allows direct interfacing with microcontroller GPIOs or logic-level control signals without level-shifting. |
| Wide-input compatibility | Supports 60V max input - suitable for 48V industrial buses, PoE-powered equipment, and unregulated AC/DC outputs. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting 24–48V factory bus voltage to clean 3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC/DC buck regulator providing isolated, regulated logic rail with high line regulation (±0.2%) and low ripple. Use Value: Eliminates need for bulky linear regulators and external heat sinks while maintaining ±4% output accuracy across wide input transients. | Use Scenario: On-board power for ARM Cortex-M4 MCU, Ethernet PHY, and SPI peripherals in edge gateway hardware. IC Role / Device Role / Timing Role: Single-chip 3.3V power source with integrated protection, replacing multi-component discrete solutions. Use Value: Reduces BOM count by 4 parts (vs. controller + external MOSFET + driver + protection), lowering layout complexity and cost. |
| Telecom Remote Unit | Test Equipment Auxiliary Rail |
Use Scenario: Generating 3.3V from 48V telecom battery backup during AC mains failure. IC Role / Device Role / Timing Role: High-reliability, HV-input buck converter with thermal and overcurrent fault tolerance. Use Value: Sustains operation down to 4.75V input while delivering full 1A load - critical for uninterrupted service during brownouts. | Use Scenario: Providing stable 3.3V bias for precision ADC references and DAC buffers in automated test systems. IC Role / Device Role / Timing Role: Low-noise, well-regulated auxiliary supply decoupled from main system rails. Use Value: Achieves <1% load regulation and <0.5% line regulation - preserves measurement accuracy under varying load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-3.3 | TO-220 package; 40V max input; θJA = 65°C/W (no heatsink); same 52 kHz frequency and 1A rating. | Suitable for lower-power, through-hole prototyping or legacy board upgrades where HV input is unnecessary. | Select when 40V input suffices and manual assembly or socketing is preferred over surface-mount reflow. |
| LM2596S-3.3 | 1.5A output; 40V max input; 150 kHz switching; adjustable feedback divider; different pinout and layout requirements. | Better suited for higher-current or space-constrained designs needing improved efficiency at light loads. | Choose for new designs requiring >1A capability or higher switching frequency to reduce inductor size - but requires PCB redesign. |
Compared with LM2575T-3.3, LM2575HVSX-3.3 adds 20V input headroom and superior thermal performance; compared with LM2596S-3.3, it trades higher current and frequency for proven HV robustness and simpler external component count.
Availability
LM2575HVSX-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, telecom remote units, and test equipment auxiliary rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2575HVSX-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 expertise in high-reliability power conversion ICs.
The LM2575HV product line was designed specifically for industrial, telecom, and automotive applications demanding extended input voltage range (up to 60V), robust thermal protection, and minimal external component count - targeting cost-sensitive, high-volume power supply designs.
FAQ
What is the maximum input voltage rating for LM2575HVSX-3.3?
The LM2575HVSX-3.3 supports a maximum input voltage of 60V, as specified in the Absolute Maximum Ratings table of the official TI datasheet (SNVS106E). This HV rating distinguishes it from standard LM2575 variants (40V max) and enables direct use with 48V industrial buses, PoE+ sources, and unregulated rectified inputs without pre-regulation stages. Operation above 60V risks permanent damage.
Does LM2575HVSX-3.3 require external feedback resistors to set its output voltage?
No, LM2575HVSX-3.3 does not require external feedback resistors. It is a fixed-output variant with the 3.3V regulation internally configured; the FEEDBACK (Pin 4) is not connected in this version and must remain unattached. External resistors are only needed for the adjustable (ADJ) versions like LM2575HVSX-ADJ, where R1 and R2 set VOUT = 1.23V × (1 + R2/R1).
What package type and thermal characteristics does LM2575HVSX-3.3 use?
LM2575HVSX-3.3 uses a 5-lead DDPAK/TO-263 surface-mount package (TI package code KTT0005B) with an exposed thermal pad. Its junction-to-ambient thermal resistance is 37°C/W when mounted on 1 in² of PCB copper, significantly lower than the TO-220 version (65°C/W), enabling higher power density and reduced need for external heatsinks in compact industrial designs.
Can LM2575HVSX-3.3 be used in synchronous rectification configurations?
No, LM2575HVSX-3.3 cannot be used in synchronous rectification configurations. It integrates only a single NPN bipolar transistor as the main switch and requires an external Schottky or fast-recovery diode (e.g., MBR340 or SR103) as the catch diode. Synchronous operation would require a second actively controlled switch - a feature absent in the LM2575 architecture and reserved for newer families like LM2678 or TPS5430.
What is the typical efficiency of LM2575HVSX-3.3 at full 1A load?
The typical efficiency of LM2575HVSX-3.3 is 75% at 12V input and 1A output load, per the Electrical Characteristics table in the TI datasheet (SNVS106E). Efficiency varies with input voltage and load - e.g., it reaches ~88% at 15VIN/1A for the 12V variant - but for LM2575HVSX-3.3, 75% represents the validated baseline under standard test conditions with recommended external components.
LM2575HVSX-3.3 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:
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2575HVSX-3.3 FAQ
1.How can I place an order for LM2575HVSX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVSX-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 LM2575HVSX-3.3 reliable?
The price and inventory of LM2575HVSX-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 LM2575HVSX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2575HVSX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVSX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVSX-3.3?
LM2575HVSX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVSX-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 LM2575HVSX-3.3?
For technical support, including LM2575HVSX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVSX-3.3 requirements.
6.How does Aetrix verify that LM2575HVSX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2575HVSX-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 LM2575HVSX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2575HVSX-3.3?
All LM2575HVSX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVSX-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 LM2575HVSX-3.3 part is unused and in its original packaging.
Return procedure for LM2575HVSX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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