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Texas Instruments LM2575S-15
- Part No.:
- LM2575S-15
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-15.pdf
- Description:
- IC REG BUCK 15V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
LM2575S-15 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-263 (DDPAK) package, delivering a fixed 15V output with ±4% tolerance across 18V–40V input and 0.2A–1A load. It integrates PWM controller, power switch, and protection circuitry, enabling high-efficiency DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2575S-15 datasheet, LM2575S-15 pinout, LM2575S-15 application, or LM2575S-15 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply support for volume procurement and BOM continuity.
Technical Context
The LM2575S-15 implements a fixed-frequency (52 kHz) current-mode buck topology with internal 1.23V reference, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control. Its integrated N-channel MOSFET switch features 0.9V typical saturation voltage at 1A, enabling efficient operation without external gate drivers.
Designed for minimal external components, it requires only one inductor, one Schottky catch diode, and two electrolytic capacitors - eliminating need for loop compensation networks or external frequency programming. Input voltage range is 18V to 40V (non-HV version), supporting stable 15V output under line and load regulation per JEDEC JESD47.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±4% over 0.2A–1A load and 18V–40V input - ensures stable rail for analog front-ends or logic interfaces without trimming. |
| Switching Frequency | 52 kHz fixed internal oscillator - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) and reduces EMI filtering complexity. |
| Max Output Current | 1A continuous - supports single-rail powering of microcontrollers, sensors, or op-amp stages without derating at 25°C ambient. |
| Efficiency | 88% at VIN = 18V, IOUT = 1A - reduces thermal load vs. linear regulators; eliminates need for heatsink in TO-263 package with ≥1 in² copper area. |
| Thermal Resistance | θJA = 37°C/W (TO-263, 1 in² copper) - enables 1A operation up to +85°C ambient without forced air or external heatsink. |
| Standby Current | 50 µA typical in shutdown (ON/OFF pin = 5V) - suitable for battery-backed systems requiring ultra-low quiescent power. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit (1.7–3.0A peak) - prevents latch-up during overload or short-circuit events without external sensing. |
Pinout & Package
LM2575S-15 uses a 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), with exposed thermal pad electrically connected to Pin 2 (Output). The package supports high-power dissipation via PCB copper thermal spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 18–40V; requires local 47–100 µF aluminum electrolytic bypass capacitor within 5 mm of pin. |
| 2 - Output | Regulated 15V DC output | Power switch drain node; connects to inductor and output capacitor; thermal pad tied to this pin for heat transfer. |
| 3 - Ground | Power and signal reference | Common return for input cap, output cap, feedback network, and ON/OFF control; must be low-inductance connection. |
| 4 - Feedback | Voltage sense input | Internally compares to 1.23V reference; unused in fixed-output versions - left open or grounded per TI layout guidelines. |
| 5 - ON/OFF | TTL-compatible enable control | Drives internal bias circuits; <1.0V disables regulator (50 µA standby); >2.2V enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch | N-channel MOSFET with 0.9V VDS(sat) at 1A - eliminates external transistor and driver, reducing board area and component count. |
| Fixed 15V output | No external resistors required - simplifies layout, improves long-term stability, and avoids resistor tolerance drift in output voltage. |
| 52 kHz oscillator | Internal fixed frequency - removes need for timing capacitor/resistor; ensures consistent EMI profile and inductor selection across production lots. |
| TTL shutdown | 50 µA standby current with logic-level control - enables seamless integration into microcontroller-controlled power sequencing without level shifters. |
| Thermal & current protection | Auto-recovery thermal shutdown + cycle-by-cycle current limit - sustains reliability in unattended industrial environments without system-level watchdog intervention. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: Providing clean 15V for PLC I/O modules operating from 24V DC bus with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V bus to isolated 15V analog supply with tight line/load regulation. Use Value: Delivers 1A at 88% efficiency with no heatsink needed - reduces enclosure size and thermal management cost in DIN-rail mounted systems. |
Use Scenario: Generating 15V for FPGA configuration circuitry and analog sensor interface in edge AI gateway. IC Role / Device Role / Timing Role: On-board pre-regulator feeding low-noise LDOs; enabled/disabled via MCU GPIO for power domain control. Use Value: 50 µA shutdown current extends battery backup runtime; 52 kHz switching avoids interference with RF comms bands. |
| Test Equipment Power | Motor Drive Auxiliary Supply |
Use Scenario: Stable 15V rail for precision DACs and op-amps in portable multimeters and calibrators. IC Role / Device Role / Timing Role: High-accuracy voltage source with ±4% output tolerance and low ripple (<1% of VOUT). Use Value: Fixed 15V eliminates resistor network errors; TO-263 thermal performance maintains regulation accuracy across 0–70°C operating range. |
Use Scenario: Powering gate drivers and logic in 24V/48V BLDC motor controllers where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Auxiliary DC/DC converter supplying isolated 15V for half-bridge driver ICs and current sense amplifiers. Use Value: Integrated current limiting protects against shoot-through faults; thermal shutdown prevents damage during stall conditions. |
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 | Same electrical specs but in through-hole TO-220 package (θJA = 45°C/W); no exposed thermal pad. | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred. | Select when thermal budget allows higher junction rise or when legacy board layouts require TO-220 footprint. |
| LM2596S-15 | Higher 3A rating, 150 kHz switching, improved efficiency (≥92%), but requires different inductor/capacitor values and layout. | Better suited for higher-current or space-constrained designs needing smaller magnetics and lower output ripple. | Choose when upgrading from LM2575S-15 for increased load headroom or tighter EMI control - not drop-in compatible. |
Compared with LM2575T-15, the LM2575S-15 offers superior thermal performance in surface-mount applications; compared with LM2596S-15, it trades higher current capability for proven robustness, simpler design, and lower EMI sensitivity in noisy industrial environments.
Availability
LM2575S-15 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, test equipment power, and motor drive auxiliary supplies requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LM2575S-15 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 ICs, with decades of expertise in switching regulator design and manufacturing.
The LM2575 series was engineered as a drop-in replacement for linear regulators in medium-power applications, targeting cost-sensitive industrial, automotive, and consumer systems requiring high efficiency and minimal external components.
FAQ
What is the maximum input voltage for LM2575S-15?
The LM2575S-15 supports a maximum input voltage of 40V under normal operating conditions. This is specified for the standard LM2575-N family (not the HV variant). Exceeding 40V risks permanent damage, as absolute maximum rating is 45V - operation above 40V is outside guaranteed specifications and not recommended for reliable long-term use of the LM2575S-15.
Does LM2575S-15 require an external feedback resistor network?
No, the LM2575S-15 does not require an external feedback resistor network. As a fixed-output 15V version, its feedback divider is fully internal. Pin 4 (Feedback) is not connected in standard operation and should be left open or grounded per TI's layout recommendations - unlike the adjustable LM2575-ADJ, the LM2575S-15 delivers 15V without any external resistors.
What package type is used by LM2575S-15?
The LM2575S-15 uses a 5-lead surface-mount DDPAK/TO-263 package (TI package code KTT0005B), featuring an exposed thermal pad that must be soldered to a minimum 1 in² copper area on the PCB for optimal thermal performance. This differs from the TO-220 (LM2575T-15) and SOIC (LM2575M-15) variants.
Can LM2575S-15 be used in synchronous rectification designs?
No, the LM2575S-15 cannot be used in synchronous rectification designs. It employs an internal N-channel MOSFET switch paired with an external Schottky catch diode - it lacks a second integrated switch or gate drive outputs required for synchronous operation. Designs requiring synchronous rectification must use dedicated controllers like the TPS5430 or LM2678 instead of the LM2575S-15.
What is the typical efficiency of LM2575S-15 at full load?
The LM2575S-15 achieves 88% typical efficiency at VIN = 18V, VOUT = 15V, and IOUT = 1A - measured under standard test conditions per SNVS106E. Efficiency varies with input voltage and load; it drops to ~75% at VIN = 40V/1A due to higher switching and conduction losses, and rises slightly at lighter loads.
LM2575S-15 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):
- 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 FAQ
1.How can I place an order for LM2575S-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-15 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 reliable?
The price and inventory of LM2575S-15 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 is usually 5 days.
3.What payment methods are accepted for LM2575S-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-15?
LM2575S-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-15 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?
For technical support, including LM2575S-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-15 requirements.
6.How does Aetrix verify that LM2575S-15 is sourced from the original manufacturer or authorized distributors?
All LM2575S-15 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 meets industry standards.
7.What is the process for return or replacement of LM2575S-15?
All LM2575S-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-15, 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 part is unused and in its original packaging.
Return procedure for LM2575S-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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