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Texas Instruments LM2575HVS-3.3/NOPB
- Part No.:
- LM2575HVS-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575HVS-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
LM2575HVS-3.3/NOPB 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/NOPB datasheet, LM2575HVS-3.3/NOPB pinout, LM2575HVS-3.3/NOPB application, or LM2575HVS-3.3/NOPB equivalent, this device serves as a drop-in replacement for linear regulators in 3.3V distributed power systems where thermal management and board area are critical constraints.
Technical Context
The LM2575HVS-3.3/NOPB implements a fixed-frequency, pulse-width modulation (PWM) buck topology with internal NPN switch, feedback comparator, and 1.23V reference. Its 52 kHz oscillator enables predictable EMI filtering and compatibility with standard off-the-shelf inductors rated for ≥52 kHz operation.
It operates across −40°C to +125°C junction temperature, supports up to 60V input via HV-series process, and delivers regulated 3.3V output with line regulation ≤0.5% and load regulation ≤1% under full operating conditions. Standby current is 50 μA typical when the ON/OFF pin is pulled high.
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 feedback resistors. |
| Input Voltage Range | 4.75V to 60V - supports wide-input industrial, automotive, and telecom power buses including 24V, 36V, and 48V nominal systems. |
| Output Current | 1A continuous - sufficient to power multiple low-power ICs or a single mid-range MCU with peripherals. |
| Switching Frequency | 52 kHz fixed - simplifies EMI filter design and enables use of low-cost, high-saturation-current power inductors (e.g., 330 μH). |
| Efficiency | 75% at VIN = 12V, IOUT = 1A - reduces heat generation by >50% versus comparable linear regulators, eliminating need for heatsinks in many applications. |
| Thermal Resistance | θJA = 37°C/W (with ≥1 in² PCB copper) - enables compact thermal layout without external heatsink under typical 1A loads. |
| Shutdown Current | 50 μA typical - allows ultra-low-power system sleep modes while retaining fast wake-up capability. |
Pinout & Package
LM2575HVS-3.3/NOPB uses a 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring an exposed thermal pad for enhanced PCB heat dissipation. The package measures 10.16 mm × 8.42 mm × 4.57 mm and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 4.75–60V; requires local 100 μF/75V aluminum electrolytic bypass capacitor placed within 5 mm. |
| 2 - Output | Regulated 3.3V DC output | Drives 1A load; connects to 330 μF/25V output capacitor and catch diode anode; sensitive to trace inductance. |
| 3 - Ground | Power and signal reference | Must be connected directly to thermal pad and low-impedance ground plane; shared return for input/output capacitors and diode cathode. |
| 4 - Feedback | Internal voltage sense node | Internally tied to 3.3V output; not accessible externally - eliminates external resistor divider and associated layout sensitivity. |
| 5 - ON/OFF | TTL-compatible enable control | Pull ≥2.2V to enable; ≤0.8V to enter 50 μA standby; open-circuit defaults to enabled; no pull-up required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A NPN switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and layout complexity. |
| Fixed 3.3V output with no external resistors | Guarantees precise 3.3V rail for modern digital logic without calibration or trimming components. |
| 52 kHz fixed-frequency oscillator | Enables deterministic EMI behavior and compatibility with low-cost, high-current inductors optimized for 50–100 kHz. |
| Thermal shutdown + current limit protection | Prevents damage during overload, short-circuit, or inadequate heatsinking - self-recovering after fault removal. |
| DDPAK/TO-263 thermal pad | Provides 37°C/W junction-to-ambient thermal resistance with 1 in² PCB copper, enabling 1A operation without heatsink. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: Converting 24V or 48V factory bus to 3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3V supply with high noise immunity and thermal robustness. Use Value: Delivers 1A at 75%+ efficiency, reducing board temperature rise by >20°C versus linear alternatives and enabling conformal coating in harsh environments. |
Use Scenario: Powering ARM Cortex-M4 microcontrollers, Ethernet PHYs, and SPI peripherals on compact edge-node PCBs. IC Role / Device Role / Timing Role: Single-chip 3.3V DC/DC converter replacing multi-component linear solutions to meet tight board area budgets. Use Value: Fixed-output architecture eliminates feedback resistor placement errors and improves long-term output stability over temperature (±4% max deviation). |
| Telecom Line Card | Test Equipment Power |
Use Scenario: Generating 3.3V from 48V backplane in modular base station cards requiring high reliability and low standby power. IC Role / Device Role / Timing Role: High-voltage input buck regulator with TTL shutdown enabling remote power cycling and hot-swap compliance. Use Value: 50 μA standby current and 60V input rating support energy-efficient sleep modes and transient-tolerant operation during hot insertion. |
Use Scenario: Providing clean, stable 3.3V for precision ADCs, DACs, and FPGA configuration in benchtop instruments. IC Role / Device Role / Timing Role: Low-noise switching regulator with fixed frequency and integrated compensation for repeatable measurement accuracy. Use Value: 52 kHz switching frequency avoids interference with common audio and RF test bands, and enables simple LC filtering to meet <10 mVpp ripple 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/NOPB | TO-220 package; 40V max input; θJA = 65°C/W (no thermal pad); same electrical specs. | Suitable for prototyping or low-volume through-hole assembly; requires heatsink above ~0.5A. | Select when manual soldering, breadboarding, or legacy through-hole layout is required. |
| MP1584EN-LF-Z | 4.5–28V input; 3A output; 1.5 MHz switching; smaller SOIC-8 package; no HV rating. | Better suited for compact consumer electronics with lower input voltage; lacks 60V tolerance and industrial temp range. | Choose for space-constrained designs below 28V input where higher frequency and current headroom are needed. |
Compared with LM2575T-3.3/NOPB, LM2575HVS-3.3/NOPB offers superior thermal performance and 60V input capability in surface-mount form; versus MP1584EN-LF-Z, it trades higher frequency for rugged HV operation and proven industrial reliability - making it optimal for 24–48V industrial systems demanding long-term stability.
Availability
LM2575HVS-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, and telecom line cards requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2575HVS-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 industrial and telecom applications requiring wide-input voltage operation (up to 60V), robust thermal performance, and minimal external component count in switching DC/DC regulation.
FAQ
What is the maximum input voltage rating for LM2575HVS-3.3/NOPB?
The LM2575HVS-3.3/NOPB supports a maximum input voltage of 60V, as confirmed in the Absolute Maximum Ratings table of the official TI datasheet (SNVS106E). This HV rating distinguishes it from standard LM2575 variants (45V max) and enables direct use in 48V telecom and industrial power systems without pre-regulation.
Does LM2575HVS-3.3/NOPB require external feedback resistors to set the output voltage?
No, LM2575HVS-3.3/NOPB does not require external feedback resistors. It is a fixed-output variant with the 3.3V regulation internally trimmed and verified across temperature and load - the Feedback (pin 4) is not accessible and is permanently connected to the internal reference node.
What package type and thermal characteristics does LM2575HVS-3.3/NOPB use?
LM2575HVS-3.3/NOPB uses a 5-lead DDPAK/TO-263 package (KTT0005B) with an exposed thermal pad. With ≥1 in² of PCB copper connected to the pad, its junction-to-ambient thermal resistance is 37°C/W - enabling 1A continuous operation without an external heatsink under typical ambient conditions.
Can LM2575HVS-3.3/NOPB be used in synchronous rectification configurations?
No, LM2575HVS-3.3/NOPB cannot be used in synchronous rectification configurations. It integrates only a single NPN power switch and requires an external Schottky catch diode (e.g., SR103 or MBR340) - it lacks a second switch or gate drive outputs necessary for synchronous operation.
What is the typical efficiency of LM2575HVS-3.3/NOPB at 1A output current?
The typical efficiency of LM2575HVS-3.3/NOPB is 75% at VIN = 12V and IOUT = 1A, as specified in the Electrical Characteristics table for the 3.3V version. Efficiency increases with higher input-to-output voltage ratios - e.g., reaching ~88% at VIN = 15V for the 12V variant - but remains consistent with the 3.3V part's published data points.
LM2575HVS-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:
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2575HVS-3.3/NOPB FAQ
1.How can I place an order for LM2575HVS-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVS-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 LM2575HVS-3.3/NOPB reliable?
The price and inventory of LM2575HVS-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 LM2575HVS-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575HVS-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVS-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575HVS-3.3/NOPB?
LM2575HVS-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVS-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 LM2575HVS-3.3/NOPB?
For technical support, including LM2575HVS-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVS-3.3/NOPB requirements.
6.How does Aetrix verify that LM2575HVS-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575HVS-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 LM2575HVS-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575HVS-3.3/NOPB?
All LM2575HVS-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVS-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 LM2575HVS-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2575HVS-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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