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Texas Instruments LM2575IN
- Part No.:
- LM2575IN
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575IN.pdf
- Description:
- IC REG BUCK ADJ 1A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
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Product details
Overview
LM2575IN from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220-5 package, delivering fixed 5V output with ±4% tolerance, 52 kHz fixed-frequency operation, and integrated thermal shutdown/current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575IN datasheet, LM2575IN pinout, LM2575IN application, or LM2575IN equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for volume procurement and BOM continuity.
Technical Context
The LM2575IN implements a current-mode controlled buck topology with internal 52 kHz oscillator, cycle-by-cycle peak current limiting, and thermal shutdown. Its feedback loop uses a precision 1.23V reference and requires only two external resistors for adjustable versions - though LM2575IN is fixed 5V, eliminating R1/R2.
It operates across 8V–40V input range, sustains 1A continuous output current, and achieves up to 77% efficiency at 12VIN/5VOUT/1A. Standby current is 50 μA typical when TTL-shutdown enabled via pin 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over full temperature and load range - ensures stable logic rail without trimming. |
| Max Input Voltage | 40V - supports 24V industrial bus inputs with margin for transients. |
| Output Current | 1A continuous - drives microcontrollers, sensors, and peripheral ICs directly. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, standard inductors (e.g., PE-52627) without EMI filtering complexity. |
| Efficiency | 77% at 12VIN, 5VOUT, 1A - reduces thermal load vs. linear regulators; no heatsink required below ~0.5A. |
| Quiescent Current | 5 mA typical - enables low-power standby modes; drops to 50 μA in TTL shutdown. |
| Thermal Shutdown | Activates at TJ ≥150°C - protects against sustained overload or poor PCB copper layout. |
Pinout & Package
LM2575IN is supplied in a 5-lead TO-220 package (package code NDH0005D), with tab electrically connected to Pin 2 (Output). Mounting requires thermal interface to heatsink or copper pour for >0.5A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Voltage input (8–40V) | Connects to bulk input capacitor (≥47 μF); sensitive to trace inductance - keep short and wide. |
| 2 - Output | Regulated 5V switch-node | Drives inductor and catch diode; also connects to TO-220 tab - must be isolated from chassis ground unless referenced. |
| 3 - Ground | Power and signal reference | Single-point connection point for input cap, output cap, and feedback network; critical for noise control. |
| 4 - Feedback | Output voltage sensing | Internally tied to 5V divider for fixed version - not accessible; unused but must remain unconnected. |
| 5 - ON/OFF | TTL-compatible enable | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces IQ to 50 μA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A power switch | Eliminates need for external MOSFET and driver; simplifies layout and reduces BOM count. |
| Fixed-frequency PWM control | 52 kHz operation allows predictable EMI filtering and avoids audio-band noise in sensitive analog circuits. |
| TTL shutdown capability | Enables system-level power sequencing and low-power sleep states without external logic. |
| Thermal + current protection | Auto-recovering shutdown prevents damage during overload, short-circuit, or inadequate heatsinking. |
| 4-component solution | Requires only input cap, inductor, catch diode, and output cap - ideal for space-constrained industrial PCBs. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: On-board 24V-to-5V conversion for PLC I/O modules operating in ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing clean, regulated 5V for microcontroller, ADC, and digital isolators. Use Value: Replaces linear regulator to eliminate heatsink, reduce board area by 40%, and improve system efficiency from 21% to 77%. |
Use Scenario: Local 12V-to-5V regulation for ARM Cortex-M4-based motor drive controller with real-time firmware execution. IC Role / Device Role / Timing Role: Dedicated power stage supplying core logic voltage with fast transient response to CPU load changes. Use Value: Delivers 1A peak current with <50 mV output ripple, enabling stable clock generation and analog sensor accuracy. |
| Test Equipment Front-End | Legacy System Upgrade |
Use Scenario: Retrofitting aging benchtop multimeters using obsolete 7805 linear regulators with higher thermal stress. IC Role / Device Role / Timing Role: Drop-in replacement power IC maintaining same footprint and pinout compatibility with modified passive layout. Use Value: Cuts power dissipation by 3.5W at full load, extending product lifetime and eliminating fan requirement. |
Use Scenario: Upgrading legacy HVAC control panels where 5V rail powers relay drivers, display backlight, and RS-485 transceivers. IC Role / Device Role / Timing Role: Centralized switching regulator supporting mixed-signal loads with simultaneous 100 ms startup time. Use Value: Maintains EN/UVLO behavior compatible with existing supervisor ICs while improving input voltage range margin. |
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 silicon die and electrical specs; differs only in packaging - TO-220-5 with bent leads (LM2575IN uses straight leads). | No change in circuit performance or thermal behavior; mechanical fit may differ in automated assembly. | Select LM2575IN for manual or socketed prototyping; LM2575T-5.0 for wave-soldered production with staggered lead pitch. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but requires external compensation and lacks built-in thermal foldback. | Better suited for compact consumer designs; less robust under sustained overload than LM2575IN's cycle-by-cycle current limit. | Choose LM2575IN for rugged industrial environments where reliability > miniaturization; MP1584EN-LF-Z only if board space is critical and thermal derating is managed externally. |
Compared with LM2575T-5.0, LM2575IN offers identical regulation performance but optimized lead form for through-hole prototyping; versus MP1584EN-LF-Z, it trades higher-frequency integration for inherent fault resilience and simpler bill-of-materials.
Availability
LM2575IN is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, and test equipment front-ends requiring stable component supply with long lifecycle visibility.
Supply support for LM2575IN 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 part of TI's SIMPLE SWITCHER® portfolio to provide robust, easy-to-use buck regulators for cost-sensitive industrial and embedded applications - prioritizing reliability, minimal external parts, and thermal resilience over ultra-high frequency or digital control.
FAQ
What is the maximum input voltage rating for LM2575IN?
The LM2575IN has an absolute maximum input voltage of 45V, but its specified operating range is 8V to 40V. Exceeding 40V risks violating output voltage accuracy and thermal limits - for 48V systems, consider the LM2575HV variant rated up to 60V input. Always verify transient conditions with input clamping diodes when using LM2575IN in automotive or industrial environments.
Does LM2575IN require external compensation components?
No, LM2575IN includes internal frequency compensation and is stable with the standard 4-component configuration (input cap, inductor, catch diode, output cap). No external compensation network is needed - unlike many current-mode controllers, its loop is factory-tuned for 52 kHz operation and typical output capacitor ESR ranges. This eliminates tuning effort and improves design repeatability.
Can LM2575IN be used in adjustable-output configurations?
No, LM2575IN is a fixed 5V output variant. The adjustable version is designated LM2575IN-ADJ (or LM2575N-ADJ), which exposes the feedback pin and requires external resistor dividers. Attempting to modify LM2575IN's output voltage by altering external components will not work - its internal feedback network is hardwired to 5V, and pin 4 is not functional.
What is the thermal resistance (θJA) of LM2575IN in TO-220 package?
LM2575IN in the 5-lead TO-220 package has θJA = 65°C/W with minimal copper (no heatsink), and 45°C/W with ~4 in² of PCB copper area surrounding the leads. These values assume vertical mounting per TI's thermal model. For 1A continuous operation, thermal design must ensure junction temperature stays ≤125°C - typically requiring ≥2 in² of 2-oz copper pour or a small heatsink.
Is LM2575IN RoHS compliant and lead-free?
Yes, LM2575IN is RoHS compliant and lead-free per TI's current manufacturing standards. The device carries the "N" suffix per TI's nomenclature, indicating lead-free finish and green molding compound. Full compliance documentation, including material declarations and test reports, is available in TI's official product folder for LM2575IN on ti.com.
LM2575IN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
LM2575IN FAQ
1.How can I place an order for LM2575IN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575IN 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 LM2575IN reliable?
The price and inventory of LM2575IN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575IN is usually 5 days.
3.What payment methods are accepted for LM2575IN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575IN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575IN?
LM2575IN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575IN 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 LM2575IN?
For technical support, including LM2575IN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575IN requirements.
6.How does Aetrix verify that LM2575IN is sourced from the original manufacturer or authorized distributors?
All LM2575IN 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 LM2575IN meets industry standards.
7.What is the process for return or replacement of LM2575IN?
All LM2575IN units undergo pre-shipment inspection (PSI). If there is an issue with LM2575IN, 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 LM2575IN part is unused and in its original packaging.
Return procedure for LM2575IN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575IN Tags
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