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Texas Instruments LM2575S-15/NOPB
- Part No.:
- LM2575S-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-15/NOPB.pdf
- Description:
- IC REG BUCK 15V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LM2575S-15/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 15V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 18V to 40V input and delivers stable 15V power for industrial control rails and embedded power subsystems.
For engineers reviewing the LM2575S-15/NOPB datasheet, LM2575S-15/NOPB pinout, LM2575S-15/NOPB application, or LM2575S-15/NOPB equivalent, this device serves as a high-efficiency replacement for linear regulators in medium-power DC-DC conversion where compact size, minimal external components (only 4 required), and robust fault protection are critical.
Technical Context
The LM2575S-15/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single TO-263 (DDPAK) package. Its fixed-frequency 52 kHz operation enables predictable EMI filtering and compatibility with standard off-the-shelf inductors rated for ≥1.15 A DC and 52 kHz.
It uses voltage-mode control with internal frequency compensation and requires no external loop compensation. The ON/OFF pin supports TTL-compatible shutdown with 50 μA standby current, while the feedback node is internally connected to set 15V output - eliminating external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over 0.2–1 A load, 18–40 V input, −40°C to +125°C junction temperature |
| Max Output Current | 1 A continuous; limited by thermal resistance (θJA = 37°C/W with 1 in² copper) and internal 2.2 A peak current limit |
| Switching Frequency | 52 kHz fixed; enables use of low-cost, high-saturation-current inductors and simplifies EMI filter design |
| Input Voltage Range | 18 V to 40 V DC; minimum dropout defined by duty cycle limit (98%) and saturation voltage (0.9 V typical) |
| Efficiency | 88% at VIN = 18 V, IOUT = 1 A; reduces heat sink requirements versus linear regulators |
| Quiescent Current | 5 mA operating; drops to 50 μA in TTL shutdown mode - suitable for low-power standby states |
| Protection Features | Thermal shutdown, cycle-by-cycle current limiting, and safe short-circuit recovery without latch-up |
Pinout & Package
LM2575S-15/NOPB is housed in a 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), featuring an exposed thermal pad for enhanced heat dissipation. The package measures 10.16 mm × 8.38 mm × 4.57 mm and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input (VIN) | Main DC input supply connection | Accepts 18–40 V; requires local 100 μF/75 V aluminum electrolytic bypass capacitor |
| 2 - Output (VOUT) | Regulated 15 V switching output | Drives external inductor and catch diode; connects to 330 μF/25 V output capacitor |
| 3 - Ground (GND) | Power and signal reference plane | Must be tied directly to PCB ground plane; shared return for internal circuits and thermal pad |
| 4 - Feedback (FB) | Internal voltage sense node | Internally connected to 15 V divider; no external components required for fixed-output version |
| 5 - ON/OFF | Digital enable/disable control | TTL-compatible: <1.0 V = ON, >2.2 V = OFF; draws ≤12 μA when active, 50 μA in standby |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external resistor network - reduces BOM count, layout sensitivity, and temperature drift |
| Only 4 external components required | Inductor, catch diode, input capacitor, output capacitor - accelerates design-in and lowers system cost |
| Integrated thermal shutdown | Automatically disables switching above 150°C junction temperature and recovers autonomously on cooldown |
| 52 kHz fixed-frequency oscillator | Enables consistent EMI signature and simplifies input/output filter design using standardized passive components |
| TTL shutdown capability | Supports microcontroller-controlled power sequencing with <50 μA standby current - ideal for battery-backed systems |
Applications
| Industrial Power Rails | Embedded System Pre-Regulation |
|---|---|
|
Use Scenario: Providing clean 15 V bias for analog front-ends, op-amps, and sensor signal conditioning in PLC modules. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator delivering regulated 15 V from unregulated 24 V industrial bus. Use Value: Replaces linear regulators to eliminate heat sink requirements and improve efficiency from ~40% to 88% at 1 A load. |
Use Scenario: Generating 15 V intermediate rail for downstream LDOs powering FPGA I/O banks or MCU peripherals. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stage preceding low-noise linear regulation. Use Value: Reduces total power loss and thermal load on PCB while maintaining tight output tolerance (±4%) across wide input range. |
| On-Card Switching Supplies | Positive-to-Negative Converter |
|
Use Scenario: Local 15 V generation on dense digital boards where space and thermal management are constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck converter with integrated switch and protection. Use Value: Achieves 1 A output in TO-263 footprint with only four passives - avoids discrete MOSFET+controller complexity. |
Use Scenario: Configured in inverting buck-boost topology to generate −15 V from +24 V input for op-amp dual supplies. IC Role / Device Role / Timing Role: Core switching controller reconfigured with inverted inductor/diode path. Use Value: Leverages same 52 kHz timing and protection features - eliminates need for separate inverting controller IC. |
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-15 | TO-220 through-hole package; θJA = 45°C/W (with 4 in² copper); no exposed thermal pad | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred | Select LM2575T-15 when board-level reflow is unavailable or thermal demands are lower than 1 A continuous. |
| LM2575HVS-15 | Wider 18–60 V input range; higher 63 V absolute max input rating; identical pinout and 15 V output | Required for 48 V telecom or industrial systems where input transients exceed 40 V | Choose LM2575HVS-15 when input voltage may reach 56 V during surge or hold-up conditions. |
Compared with LM2575T-15 and LM2575HVS-15, the LM2575S-15/NOPB offers superior thermal performance in surface-mount layouts due to its TO-263 thermal pad, while retaining full functional compatibility with the standard LM2575 family - enabling drop-in substitution where board space and thermal density are prioritized.
Availability
LM2575S-15/NOPB is available at Aetrix Electronics and suitable for industrial control systems, embedded power subsystems, and programmable logic controller (PLC) designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for LM2575S-15/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 LM2575 series was designed specifically for cost-sensitive, medium-power DC-DC applications demanding simplicity, ruggedness, and minimal external components - targeting industrial, automotive, and consumer power supplies.
FAQ
What is the maximum input voltage for LM2575S-15/NOPB?
The LM2575S-15/NOPB supports a maximum operating input voltage of 40 V DC. Its absolute maximum rating is 45 V, but sustained operation above 40 V violates the specified operating conditions and risks out-of-spec behavior or premature failure. For 48 V nominal systems, TI recommends the LM2575HVS-15 variant instead.
Does LM2575S-15/NOPB require external feedback resistors?
No, the LM2575S-15/NOPB does not require external feedback resistors. As a fixed-output version, its internal resistor divider sets the regulated output to 15 V. Pin 4 (FB) is internally connected and must remain unconnected - adding external components will disrupt regulation and is not supported.
Can LM2575S-15/NOPB be used in a buck-boost (inverting) configuration?
Yes, the LM2575S-15/NOPB can be configured as a positive-to-negative converter using the standard buck-boost topology shown in TI's application notes. In this mode, it generates −15 V from a positive input, retaining its 52 kHz switching frequency, current limiting, and thermal protection - though output current capability is reduced by diode and inductor losses.
What is the thermal resistance (θJA) of LM2575S-15/NOPB under standard PCB conditions?
The LM2575S-15/NOPB has a junction-to-ambient thermal resistance (θJA) of 37°C/W when mounted on a PCB with 1 square inch of copper area thermally connected to its exposed DDPAK pad. With less copper (e.g., 0.5 in²), θJA rises to 50°C/W - design must verify junction temperature stays below 125°C under worst-case load and ambient conditions.
Is LM2575S-15/NOPB pin-compatible with other LM2575 variants?
Yes, the LM2575S-15/NOPB shares identical pinout and electrical behavior with all other LM2575-S (TO-263) variants, including LM2575S-5.0/NOPB and LM2575S-ADJ/NOPB. This allows direct substitution within the same package footprint, provided the output voltage requirement matches the fixed version selected.
LM2575S-15/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):
- 40V
- Voltage - Output (Min/Fixed):
- 15V
- 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)
LM2575S-15/NOPB FAQ
1.How can I place an order for LM2575S-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-15/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 LM2575S-15/NOPB reliable?
The price and inventory of LM2575S-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575S-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-15/NOPB?
LM2575S-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-15/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 LM2575S-15/NOPB?
For technical support, including LM2575S-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-15/NOPB requirements.
6.How does Aetrix verify that LM2575S-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575S-15/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 LM2575S-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575S-15/NOPB?
All LM2575S-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-15/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 LM2575S-15/NOPB part is unused and in its original packaging.
Return procedure for LM2575S-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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