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Texas Instruments LM2575S-ADJ
- Part No.:
- LM2575S-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
LM2575S-ADJ from Texas Instruments is a monolithic step-down (buck) switching voltage regulator IC delivering up to 1A output current with adjustable output voltage ranging from 1.23V to 37V, ±4% tolerance, operating from 40V input and featuring internal 52 kHz oscillator, thermal shutdown, and cycle-by-cycle current limiting - used in on-card DC/DC conversion for industrial power supplies.
For engineers reviewing the LM2575S-ADJ datasheet, LM2575S-ADJ pinout, LM2575S-ADJ application, or LM2575S-ADJ equivalent, this page provides verified technical context, confirmed package mapping (TO-263/DDPAK), validated pin functions, real-world application constraints, and two rigorously cross-checked alternative parts for adjustable 1A buck regulation.
Technical Context
The LM2575S-ADJ implements a fixed-frequency (52 kHz) pulse-width modulation (PWM) buck topology with integrated N-channel DMOS switch, internal frequency compensation, and feedback-controlled duty cycle adjustment via external resistor divider. It operates in continuous conduction mode and includes built-in cycle-by-cycle current limiting and thermal shutdown.
Its feedback pin (Pin 4) senses a precise 1.23V reference, enabling output voltage programming across 1.23V–37V using two external resistors. Standby mode is activated via TTL-compatible ON/OFF pin (Pin 5), drawing only 50 μA typical quiescent current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A maximum continuous - supports mid-power embedded systems without external pass transistor. |
| Input Voltage Range | 40V max (non-HV version) - compatible with 24V/36V industrial rails and unregulated AC/DC outputs. |
| Output Voltage Range | 1.23V to 37V adjustable - set by external R1/R2 divider; no fixed-voltage variants required. |
| Feedback Reference | 1.23V ±1.2% (min/max over temp) - determines output accuracy and sets minimum resolvable VOUT step. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 330–470 µH). |
| Efficiency | 77% at 12VIN/5VOUT/1A - reduces thermal load vs. linear regulators; eliminates need for large heatsinks. |
| Thermal Resistance | θJA = 37°C/W (DDPAK/TO-263, 1 in² copper) - enables 1A operation at ambient ≤70°C without forced air. |
Pinout & Package
LM2575S-ADJ is housed in a 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), with exposed thermal pad for enhanced heat dissipation. Pin numbering follows standard TO-263 orientation (viewed from top, tab left, pins right-to-left: 1–5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input (VIN) | Main power input | Accepts 4.75V–40V DC; requires ≥100 µF input capacitor near pin for stability and EMI suppression. |
| 2 - Output (VOUT) | Switch node / power output | Drives external catch diode and inductor; high dv/dt node requiring short PCB trace routing. |
| 3 - Ground (GND) | Power and signal reference | Must connect directly to thermal pad and low-impedance ground plane to ensure thermal performance and noise immunity. |
| 4 - Feedback (FB) | Voltage sense input | Compares divided output voltage to 1.23V internal reference; sensitive node requiring shortest possible trace to R1/R2 divider. |
| 5 - ON/OFF | Digital enable control | TTL-compatible shutdown input; <1.0V disables regulator (50 µA standby); >2.2V enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A DMOS switch | Eliminates need for external MOSFET and driver; simplifies layout and reduces BOM count. |
| Fixed 52 kHz oscillator | Enables predictable EMI filtering and consistent inductor selection across designs. |
| TTL shutdown with 50 µA standby | Supports low-power sleep modes in battery-backed or energy-conscious systems. |
| Cycle-by-cycle current limit | Protects against short-circuit and overload without latch-up; allows automatic recovery. |
| Thermal shutdown + internal compensation | Ensures safe operation under sustained overload; removes need for external compensation network. |
Applications
| Industrial Power Supply | Embedded Control Board |
|---|---|
Use Scenario: Converting 24V rail to 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC power to microcontroller and peripherals. Use Value: Delivers 1A at 77–88% efficiency, reducing board-level heat generation and enabling compact enclosure design. |
Use Scenario: On-card DC/DC conversion for FPGA or ARM-based edge controllers with variable core voltage needs. IC Role / Device Role / Timing Role: Adjustable-output step-down regulator supporting multiple voltage domains via resistor reconfiguration. Use Value: 1.23V–37V range accommodates diverse SoC requirements without redesigning power stage. |
| Test Equipment Power | LED Driver Pre-regulator |
Use Scenario: Stable mid-current supply for portable multimeters and handheld analyzers powered from rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping down 7.4V–12.6V battery voltage to fixed 5V for analog front-end and display logic. Use Value: 52 kHz switching avoids audible noise; thermal shutdown prevents damage during extended bench testing. |
Use Scenario: Constant-voltage pre-stage feeding constant-current LED drivers in signage or architectural lighting. IC Role / Device Role / Timing Role: Buck converter supplying 12V–24V to downstream LED driver ICs, improving overall system efficiency. Use Value: High efficiency (>88% at 12VOUT) minimizes thermal stress on adjacent LED driver components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable 1A buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Higher 150 kHz switching frequency; 3A output rating; wider 4.5–40V input range; requires smaller inductor (47–100 µH). | Better suited for space-constrained designs needing higher current or lower output ripple; not drop-in due to different pinout and compensation. | Select LM2596S-ADJ when board area is limited or >1A output is anticipated; verify loop stability with new LC values. |
| MP1584EN-LF-Z | 2A output; 1.5 MHz switching; integrated soft-start; tighter 1.22V ±1% feedback reference; requires external compensation. | Enables ultra-compact designs with ceramic output capacitors; higher frequency increases sensitivity to layout parasitics. | Choose MP1584EN-LF-Z for high-density consumer electronics; avoid in noise-sensitive analog systems without added filtering. |
Compared with LM2575S-ADJ, LM2596S-ADJ offers higher current headroom and smaller magnetics but demands revised PCB layout and compensation, while MP1584EN-LF-Z delivers superior regulation accuracy and integration at the cost of increased design complexity and EMI management effort.
Availability
LM2575S-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded control boards, test equipment, and LED driver pre-regulators requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575S-ADJ 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 reliable, high-volume power IC design.
The LM2575 series was engineered as a robust, easy-to-use replacement for linear regulators in medium-power DC/DC conversion - targeting cost-sensitive industrial, instrumentation, and telecom applications where thermal simplicity and minimal external parts are critical.
FAQ
What is the maximum input voltage rating for LM2575S-ADJ?
The LM2575S-ADJ has an absolute maximum input voltage of 45V and a recommended operating maximum of 40V. Exceeding 40V risks violating the device's specified operating ratings and may trigger thermal shutdown or reduce long-term reliability. The HV variant (LM2575HVS-ADJ) supports up to 60V input, but LM2575S-ADJ must remain within its 40V limit for guaranteed performance.
How do I calculate the output voltage for LM2575S-ADJ?
The output voltage of LM2575S-ADJ is set by two external resistors (R1 and R2) using the formula VOUT = 1.23V × (1 + R2/R1), where R1 connects from FB to GND and R2 connects from VOUT to FB. R1 should be between 1 kΩ and 5 kΩ; typical values use 2.0 kΩ (R1) and 6.12 kΩ (R2) for 5V. The LM2575S-ADJ relies on its internal 1.23V reference, so resistor tolerance and temperature coefficient directly impact output accuracy.
Does LM2575S-ADJ require an external diode, and what type is recommended?
Yes, LM2575S-ADJ requires an external Schottky catch diode connected from VOUT (Pin 2) to GND. Recommended parts include MBR340 (3A, 40V) or SR103 (3A, 30V), selected for low forward voltage (<0.5V) and fast recovery to minimize conduction loss and switching stress. The diode must handle peak currents up to 3.2A (LM2575S-ADJ current limit) and reverse voltage exceeding the input voltage.
What thermal considerations apply to LM2575S-ADJ in TO-263 package?
LM2575S-ADJ in TO-263 (DDPAK) achieves θJA = 37°C/W with ≥1 in² copper area connected to its thermal pad. Without adequate copper, junction temperature can exceed 125°C at 1A load and 50°C ambient. Designers must solder the exposed pad fully, use thermal vias to inner ground planes, and avoid enclosing the device in sealed enclosures without airflow - all critical for sustained LM2575S-ADJ reliability.
Can LM2575S-ADJ be synchronized to an external clock?
No, LM2575S-ADJ does not support external clock synchronization. Its 52 kHz oscillator is fully internal and fixed-frequency; there is no SYNC pin or frequency-adjust capability. For designs requiring synchronization (e.g., to avoid beat frequencies in multi-rail systems), alternatives like MP1584EN-LF-Z or TPS54302 must be considered - LM2575S-ADJ operates autonomously and cannot be slaved to an external timing source.
LM2575S-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- 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-ADJ FAQ
1.How can I place an order for LM2575S-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-ADJ 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-ADJ reliable?
The price and inventory of LM2575S-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575S-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-ADJ?
LM2575S-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-ADJ 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-ADJ?
For technical support, including LM2575S-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-ADJ requirements.
6.How does Aetrix verify that LM2575S-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575S-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575S-ADJ?
All LM2575S-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2575S-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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