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Texas Instruments LM2575HVS-3.3
- Part No.:
- LM2575HVS-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575HVS-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,847
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Product details
Overview
LM2575HVS-3.3 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 5-lead surface-mount DDPAK/TO-263 package, delivering a fixed 3.3V output with ±4% tolerance over 4.75–60V input and 0.2–1A load. It integrates a 52 kHz oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible shutdown control - designed for high-efficiency DC/DC conversion in space-constrained industrial power rails.
For engineers reviewing the LM2575HVS-3.3 datasheet, LM2575HVS-3.3 pinout, LM2575HVS-3.3 application, or LM2575HVS-3.3 equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases, and two technically documented alternative parts - all grounded in TI's SNVS106E datasheet and official package documentation (KTT0005B).
Technical Context
The LM2575HVS-3.3 implements a fixed-frequency (52 kHz) pulse-width modulation (PWM) buck topology with internal NPN switch, feedback comparator, and oscillator. Its HV variant supports up to 60V input, enabling direct regulation from unregulated 48V telecom or industrial bus rails without pre-regulation.
It uses external components - Schottky catch diode, power inductor, and bulk input/output capacitors - to form a complete switching regulator. The feedback loop references an internal 1.23V bandgap, with output accuracy maintained across −40°C to +125°C junction temperature and full load range.
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 for 3.3V microcontrollers and FPGAs without external resistive divider. |
| Input Voltage Range | 4.75V to 60V - supports wide-input applications including automotive cold-crank (≥4.5V), 24V/48V industrial systems, and PoE-powered equipment. |
| Output Current | 1A continuous - sufficient to power multiple low-power ICs or single-core embedded processors without external pass devices. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current inductors (e.g., PE-52627) and simplifies EMI filtering versus higher-frequency alternatives. |
| Efficiency | 75% at VIN = 12V, IOUT = 1A - reduces thermal load vs. linear regulators; eliminates need for heatsink in many ambient conditions. |
| Thermal Resistance | θJA = 37°C/W (with ≥1 in² PCB copper) - enables reliable operation at full load up to +125°C junction temperature with proper layout. |
| Shutdown Current | 50 μA typical - allows low-power standby modes in battery-backed or energy-sensitive systems. |
Pinout & Package
LM2575HVS-3.3 is housed in a 5-lead DDPAK/TO-263 surface-mount package (TI package code KTT0005B), featuring an exposed thermal pad for enhanced heat dissipation. Mounting requires soldering the tab to ≥1 in² of PCB copper area to achieve θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input (VIN) | Unregulated DC input supply | Accepts 4.75–60V; must be bypassed with ≥47 μF aluminum electrolytic capacitor near the pin to suppress switching transients. |
| 2 - Output (VOUT) | Regulated 3.3V switching node | Drives external inductor and catch diode; connects to output capacitor (≥330 μF) and load; high dI/dt node requiring short, wide traces. |
| 3 - Ground (GND) | Power and signal reference | Common return for internal circuitry, feedback network, and external components; must tie directly to thermal pad and low-impedance ground plane. |
| 4 - Feedback (FB) | Output voltage sensing input | Internally referenced to 1.23V; unused in fixed-output versions (LM2575HVS-3.3); left open or connected to VOUT per datasheet guidance. |
| 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 - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A NPN switch | Eliminates need for external MOSFET or transistor, reducing BOM count and layout complexity in compact power supplies. |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and compatibility with standard off-the-shelf inductors optimized for 52 kHz operation. |
| Cycle-by-cycle current limit | Protects against short-circuit and overload faults by limiting peak switch current to 1.7–3.2A, preventing device destruction. |
| Thermal shutdown | Automatically disables regulation if junction temperature exceeds ~150°C, allowing safe cooldown before auto-recovery. |
| Wide-input HV rating | 60V max input enables direct connection to 48V systems or rectified AC lines without front-end buck pre-regulator. |
Applications
| Industrial PLC I/O Module Power | Telecom Line Card Pre-Regulator |
|---|---|
|
Use Scenario: Powers isolated digital I/O channels and sensor interfaces in DIN-rail mounted programmable logic controllers operating from 24V or 48V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying FPGA configuration, MCU core, and level-shifted communication peripherals. Use Value: Delivers 1A at 3.3V with 75% efficiency and no heatsink required - reducing module size and thermal management overhead. |
Use Scenario: Generates stable 3.3V rail for Ethernet PHYs, packet processors, and memory on carrier-grade line cards fed from −48V telecom supply. IC Role / Device Role / Timing Role: High-input-voltage buck converter stepping −48V (rectified) down to 3.3V with robust fault protection. Use Value: Withstands 60V max input and includes thermal/current limiting - ensuring reliability during hot-swap and surge events. |
| Medical Point-of-Care Device Supply | Automotive Body Control Module (BCM) |
|
Use Scenario: Provides clean 3.3V power to ARM-based microcontrollers and touch-screen controllers in portable diagnostic instruments powered by 12V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Main DC/DC regulator supporting cold-crank operation (down to 4.75V input) and low-noise analog subsystems via proper filtering. Use Value: Maintains regulation during engine start (battery dip to ~6V) and achieves <1% output ripple with recommended 330 μF output capacitor. |
Use Scenario: Supplies 3.3V to CAN transceivers, LIN controllers, and EEPROM in vehicle body electronics modules connected to 12V battery with load-dump transients. IC Role / Device Role / Timing Role: Robust buck regulator with 60V input rating and integrated protection - handles ISO 7637-2 pulse 5a (load dump) when paired with TVS. Use Value: Eliminates need for discrete 60V-rated MOSFET and gate driver, reducing component count while meeting AEC-Q200 stress requirements. |
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 through-hole package; 40V max input; θJA = 65°C/W (no heatsink); same 52 kHz frequency and 1A rating. | Preferred for prototyping, manual assembly, or legacy board designs with through-hole footprints; less suitable for high-density SMT layouts. | Select LM2575T-3.3 only when mechanical mounting or thermal budget permits larger package and lower power density. |
| LM2596S-3.3 | Higher 150 kHz switching frequency; 40V max input; improved efficiency (~85% at 12V→3.3V/1A); different pinout and external compensation. | Better suited for designs requiring smaller inductors/capacitors or tighter output ripple; not drop-in compatible due to different FB network and layout rules. | Choose LM2596S-3.3 when upgrading for size reduction or efficiency gain - but expect redesign of magnetics, compensation, and PCB layout. |
Compared with LM2575T-3.3, LM2575HVS-3.3 offers superior thermal performance in SMT form and 60V input support; compared with LM2596S-3.3, it trades higher frequency for proven ruggedness, simpler design, and direct compatibility with legacy LM2575 layouts and inductor families.
Availability
LM2575HVS-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, medical diagnostics equipment, and automotive BCMs requiring stable component supply with long lifecycle visibility and traceable sourcing.
Supply support for LM2575HVS-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 and embedded processing technologies, with decades of expertise in power management ICs and industrial-grade reliability.
The LM2575HV product line was engineered for high-input-voltage DC/DC conversion in harsh environments - targeting applications where 48V, 24V, or rectified AC-derived rails demand robust, integrated buck regulation without external high-voltage switches.
FAQ
What is the maximum input voltage rating for LM2575HVS-3.3?
The LM2575HVS-3.3 supports a maximum input voltage of 60V, as specified in the Absolute Maximum Ratings table of TI's SNVS106E datasheet. This HV rating distinguishes it from standard LM2575 variants (40V max) and enables direct regulation from 48V industrial or telecom supplies without pre-regulation stages.
Does LM2575HVS-3.3 require an external feedback resistor network?
No - the LM2575HVS-3.3 is a fixed-output version with internal feedback divider set for 3.3V. Pin 4 (FB) is not connected internally for this variant and should be left unconnected per TI's application guidance in Figure 25 of SNVS106E.
What package type does LM2575HVS-3.3 use, and how is thermal performance achieved?
The LM2575HVS-3.3 uses a 5-lead DDPAK/TO-263 surface-mount package (TI package code KTT0005B) with an exposed thermal pad. Thermal resistance is rated at θJA = 37°C/W when mounted on ≥1 in² of PCB copper area - critical for sustaining 1A output at +125°C ambient.
Can LM2575HVS-3.3 be used in automotive applications with cold-crank conditions?
Yes - the LM2575HVS-3.3 operates down to 4.75V input and is rated for −40°C to +125°C junction temperature. Its 60V absolute maximum input also accommodates load-dump transients when paired with appropriate TVS protection, making it viable for body electronics in 12V automotive systems.
What is the typical efficiency of LM2575HVS-3.3 at full load?
At VIN = 12V, IOUT = 1A, the LM2575HVS-3.3 delivers typical efficiency of 75%, as measured per the test conditions in TI's SNVS106E Electrical Characteristics table. Efficiency rises with higher input-to-output voltage ratios (e.g., 88% at 15V→12V) and falls at low VIN or light loads.
LM2575HVS-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:
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2575HVS-3.3 FAQ
1.How can I place an order for LM2575HVS-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVS-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 LM2575HVS-3.3 reliable?
The price and inventory of LM2575HVS-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 LM2575HVS-3.3 is usually 5 days.
3.What payment methods are accepted for LM2575HVS-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVS-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVS-3.3?
LM2575HVS-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVS-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 LM2575HVS-3.3?
For technical support, including LM2575HVS-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVS-3.3 requirements.
6.How does Aetrix verify that LM2575HVS-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2575HVS-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 LM2575HVS-3.3 meets industry standards.
7.What is the process for return or replacement of LM2575HVS-3.3?
All LM2575HVS-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVS-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 LM2575HVS-3.3 part is unused and in its original packaging.
Return procedure for LM2575HVS-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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