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Texas Instruments LM2575SX-5.0/NOPB
- Part No.:
- LM2575SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575SX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,507
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Product details
Overview
LM2575SX-5.0/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 5.0V output, 52 kHz internal oscillator, ±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 LM2575SX-5.0/NOPB datasheet, LM2575SX-5.0/NOPB pinout, LM2575SX-5.0/NOPB application, or LM2575SX-5.0/NOPB equivalent, this page delivers verified technical context, TO-263 package details, real-world design values for efficiency, dropout, and quiescent current, and two validated alternative parts with functional and application-level distinctions.
Technical Context
The LM2575SX-5.0/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 use of standard off-the-shelf inductors and reduces EMI compared to higher-frequency alternatives.
It operates across 8V–40V input range, delivers up to 1A continuous output at 5.0V ±4%, and features TTL-compatible ON/OFF control with 50 μA standby current. Protection includes thermal shutdown, current limit (2.2A peak), and output short-circuit resilience via frequency foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 0.2–1A load and 8–40V input - ensures stable logic rail without external resistive divider. |
| Max Output Current | 1A continuous - supports microcontroller, FPGA I/O, or sensor subsystems without derating at 25°C ambient. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) and simplifies EMI filtering. |
| Efficiency | 77% at 12VIN/5VOUT/1A - reduces heat sink requirements versus linear regulators; typical dissipation <1.3W. |
| Quiescent Current | 5 mA operating / 50 μA standby - enables low-power sleep modes in battery-backed or always-on systems. |
| Duty Cycle Range | 5%–98% - supports wide input-to-output ratios (e.g., 40V→5V) while maintaining regulation under light loads. |
| Thermal Resistance | θJA = 37°C/W (DDPAK/TO-263, 1 in² copper) - allows 1A operation up to +85°C ambient without forced air. |
Pinout & Package
LM2575SX-5.0/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), with exposed thermal pad for enhanced heat transfer. The package measures 10.16 mm × 8.89 mm × 4.57 mm and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Voltage supply input | Accepts 8–40V DC; requires ≥47 µF low-ESR aluminum electrolytic capacitor placed within 5 mm. |
| 2 - Output | Switched output node | Drives external catch diode and LC filter; connects directly to inductor and output capacitor anode. |
| 3 - Ground | Power and signal reference | Must be tied to thermal pad and PCB ground plane; serves as return for internal switch and feedback circuitry. |
| 4 - Feedback | Regulation sense input | Internally connected to 5.0V output; not user-accessible - fixed-voltage version omits external resistor network. |
| 5 - ON/OFF | Enable/disable control | TTL-compatible: ≤0.8V = OFF (50 μA standby), ≥2.2V = ON; open-drain compatible with microcontroller GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NPN power switch | Eliminates need for external MOSFET driver; saturation voltage ≤0.9V at 1A enables high efficiency at low VIN. |
| Internal frequency compensation | Permits stable operation with only 4 external components (input cap, output cap, inductor, catch diode) - no loop tuning required. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating; auto-recovery on cooldown - no latch-up or manual reset needed. |
| Standard inductor compatibility | Optimized for 330 µH (5V output); eliminates custom magnetics - Pulse PE-52627, AIE 415-0926, and Renco RL1952 are drop-in options. |
| TTL shutdown interface | Enables system-level power sequencing: microcontroller can disable LM2575SX-5.0/NOPB before entering deep sleep, cutting total system IQ to <100 μA. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powers 5V logic rails for digital I/O expanders, ADC references, and optocoupler interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 1A with <1% ripple; provides clean, regulated supply independent of 24V bus fluctuations. Use Value: Replaces LM7805 linear regulator, reducing board temperature rise by >40°C and eliminating need for heatsink in enclosed enclosures. |
Use Scenario: Supplies 5V to microcontroller peripherals (CAN transceivers, LIN drivers, EEPROM) in body control units with 9–16V battery input. IC Role / Device Role / Timing Role: Pre-regulator stepping down battery voltage prior to LDOs; handles cold-crank (6.5V) and load-dump (40V) transients via wide input range. Use Value: Maintains regulation during 12V battery dips to 7V, ensuring uninterrupted MCU operation without brownout resets. |
| Medical Point-of-Care Device | Networking Edge Router Board |
|
Use Scenario: Generates isolated 5V rail for USB host controller and sensor interface in portable diagnostic equipment powered by Li-ion battery pack. IC Role / Device Role / Timing Role: Main DC-DC converter in compact 2-layer PCB layout; operates in discontinuous conduction mode at light loads for low standby power. Use Value: Achieves 77% efficiency at full load and 50 μA shutdown current - extends single-charge runtime by >3 hours versus linear solution. |
Use Scenario: Provides 5V core power to Ethernet PHYs and management microcontrollers on small-form-factor edge routers with limited thermal budget. IC Role / Device Role / Timing Role: High-current point-of-load regulator mounted near PHY ICs; uses TO-263 thermal pad for direct copper pour conduction. Use Value: Delivers 1A with <37°C/W junction-to-ambient rise - keeps PHY junction temperature within spec even at 70°C ambient. |
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-5.0 | Same architecture and specs, but in through-hole TO-220 package (θJA = 65°C/W); no exposed thermal pad. | Preferred for prototyping, low-volume assembly, or legacy through-hole designs where reflow isn't available. | Select LM2575T-5.0 when manual soldering or socket-based testing is required; avoid for high-density SMT production. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but lower max current (3A vs 1A) and no built-in thermal shutdown latch. | Better suited for space-constrained consumer electronics; less robust for industrial overload conditions. | Choose MP1584EN-LF-Z only if board area is critical and thermal stress is managed externally; LM2575SX-5.0/NOPB remains superior for ruggedized designs. |
Compared with LM2575T-5.0, LM2575SX-5.0/NOPB offers 43% lower thermal resistance and automated reflow compatibility; versus MP1584EN-LF-Z, it trades higher-frequency size reduction for proven fault protection and simpler magnetics selection in industrial environments.
Availability
LM2575SX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical diagnostics equipment, and networking edge hardware requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575SX-5.0/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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and communications markets.
The LM2575 series was designed as a robust, easy-to-use replacement for linear regulators in medium-power DC-DC conversion, emphasizing reliability, minimal external parts, and broad input voltage tolerance for harsh environments.
FAQ
What is the maximum input voltage rating for LM2575SX-5.0/NOPB?
The LM2575SX-5.0/NOPB has an absolute maximum input voltage of 45V and an operating maximum of 40V. This allows reliable operation across wide industrial input ranges, including 24V systems with transient spikes. Exceeding 40V during normal operation risks violating the specified ±4% output accuracy and may trigger thermal shutdown under sustained overload.
Does LM2575SX-5.0/NOPB require an external feedback resistor network?
No. The LM2575SX-5.0/NOPB is the fixed 5.0V output variant - its feedback node (Pin 4) is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves accuracy, and removes resistor tolerance and temperature drift as error sources. Only adjustable versions (e.g., LM2575SX-ADJ) require external R1/R2.
Can LM2575SX-5.0/NOPB be used in a negative-output (buck-boost) configuration?
Yes - the LM2575SX-5.0/NOPB datasheet explicitly lists "Positive to Negative Converter (Buck-Boost)" as a supported application. When wired per Figure 32 in SNVS106E, it generates a regulated -5V output from a positive input, using the same external components as the standard buck configuration plus polarity-reversed output capacitor and diode.
What is the minimum recommended output capacitance for LM2575SX-5.0/NOPB?
The datasheet specifies a minimum of 100 µF aluminum electrolytic capacitor rated for ≥20V. Using 330 µF (as in the typical application circuit) reduces output ripple to ~1% of 5V (≈50 mVpp) and improves load transient response. Lower values risk instability or excessive ripple, especially under 1A step loads.
Is LM2575SX-5.0/NOPB pin-compatible with other LM2575 variants in the same package?
Yes - all LM2575 variants in the DDPAK/TO-263 package (e.g., LM2575SX-3.3/NOPB, LM2575SX-12/NOPB, LM2575SX-ADJ/NOPB) share identical pinout, footprint, and thermal pad layout. This enables design reuse and BOM flexibility: only the output voltage and feedback configuration differ between variants.
LM2575SX-5.0/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):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- 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)
LM2575SX-5.0/NOPB FAQ
1.How can I place an order for LM2575SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575SX-5.0/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 LM2575SX-5.0/NOPB reliable?
The price and inventory of LM2575SX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575SX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575SX-5.0/NOPB?
LM2575SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575SX-5.0/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 LM2575SX-5.0/NOPB?
For technical support, including LM2575SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2575SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575SX-5.0/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 LM2575SX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575SX-5.0/NOPB?
All LM2575SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575SX-5.0/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 LM2575SX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2575SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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