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Texas Instruments LM2575M-ADJ
- Part No.:
- LM2575M-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575M-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
LM2575M-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 compact DC-DC converters for industrial power rails.
For engineers reviewing the LM2575M-ADJ datasheet, LM2575M-ADJ pinout, LM2575M-ADJ application, or LM2575M-ADJ equivalent, this page delivers verified technical context, real-world design meaning of key specs, TO-220 package terminal mapping, confirmed alternative parts with functional differences, and supply support for volume procurement and BOM continuity.
Technical Context
The LM2575M-ADJ implements a fixed-frequency (52 kHz) pulse-width modulation (PWM) buck topology with integrated NPN power 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 monitors a precise 1.23V reference voltage, enabling programmable output via R1/R2 resistive divider; quiescent current is 5 mA typical during operation and drops to 50 μA in TTL-enabled standby mode. Input voltage range is 40V max, with saturation voltage ≤1.4 V at 1A load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A maximum continuous - supports single-rail loads like microcontroller cores or analog subsystems without external pass devices. |
| Output Voltage Range | 1.23 V to 37 V adjustable - set by external R1/R2 divider; enables flexible rail generation across diverse system requirements. |
| Input Voltage Range | Up to 40 V - compatible with 24 V industrial buses, automotive battery systems (with derating), and unregulated AC/DC outputs. |
| Switching Frequency | 52 kHz fixed - simplifies EMI filtering design and allows use of low-cost, high-saturation-current off-the-shelf inductors. |
| Feedback Reference | 1.23 V ±1.2% - defines output accuracy baseline; actual output tolerance is ±4% over line/load/temperature per spec. |
| Efficiency | 77% at 12 VIN/5 VOUT/1 A - reduces thermal load vs linear regulators; enables TO-220 operation without heatsink at moderate loads. |
| Thermal Resistance | 65 °C/W (Junction-to-Ambient, no heatsink) - determines required PCB copper area and derating curves for sustained 1A operation. |
Pinout & Package
LM2575M-ADJ is supplied in a 5-lead TO-220 package (package code NDH0005D), with the tab electrically connected to Pin 2 (Output). Mounting requires thermal interface to PCB copper or heatsink for >0.5 A continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 4–40 V; requires local 100 µF/75 V electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Regulated switched output node | Connects to inductor and catch diode anode; tab is internally tied to this pin - must be isolated from chassis ground if floating output needed. |
| 3 - Ground | Power and signal reference return | Single-point grounding recommended; ties internal oscillator, error amp, and current sense circuits to common reference. |
| 4 - Feedback | Resistive divider sensing node | Monitors output via R1–R2 divider; 50 nA bias current necessitates low-impedance divider (R1 = 1–5 kΩ) for stability and accuracy. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Drives internal switch OFF when pulled ≥2.2 V; draws <30 µA when active; enables low-power standby mode with 50 µA quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A NPN switch | Eliminates need for external MOSFET and driver; reduces bill-of-materials and layout complexity in space-constrained designs. |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and compatibility with standard inductor families optimized for this frequency (e.g., PE-52627). |
| TTL shutdown capability | Supports system-level power sequencing and sleep modes; standby current drops to 50 µA without external circuitry. |
| Internal thermal shutdown | Protects against sustained overload or poor heatsinking; device resumes regulation automatically after junction cools below 150°C threshold. |
| Cycle-by-cycle current limit | Clamps peak switch current to ~2.2 A; prevents destructive inductor saturation and provides robust short-circuit protection. |
Applications
| Industrial Power Supply | Embedded System Pre-Regulator |
|---|---|
Use Scenario: Generating stable 5 V or 12 V rails from 24 V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally manageable DC-DC conversion. Use Value: Replaces linear regulators to eliminate heat sink requirements and reduce board area while maintaining ±4% output accuracy under variable load. |
Use Scenario: Supplying intermediate 3.3 V or 5 V to MCU, FPGA, or ADC subsystems from higher-voltage battery or adapter inputs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-noise LDOs; handles bulk power conversion before final regulation. Use Value: Achieves 77–88% efficiency at 1 A, lowering total system power dissipation and extending battery runtime in portable instrumentation. |
| On-Card Buck Converter | Positive-to-Negative Inverter |
Use Scenario: Local voltage conversion on dense PCBs where space prohibits external controllers or multi-chip solutions. IC Role / Device Role / Timing Role: Self-contained buck regulator requiring only four external components (inductor, diode, two capacitors). Use Value: Minimizes component count and layout footprint - ideal for cost-sensitive consumer electronics and edge-node IoT devices. |
Use Scenario: Generating regulated negative supply (e.g., –5 V) from positive input using buck-boost topology with inverted output configuration. IC Role / Device Role / Timing Role: Core switching element in inverting buck-boost converter; leverages internal switch and feedback architecture for polarity reversal. Use Value: Enables dual-rail analog circuits (op-amps, data converters) without dedicated inverting ICs or transformers - reduces BOM and design time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-ADJ | Higher 3A output current rating; 52 kHz frequency; wider 40 V input range; requires larger inductor and diode due to higher peak current. | Better suited for >1 A loads or higher transient demands; not drop-in - needs recalculation of R1/R2, inductor, and diode ratings. | Select LM2576-ADJ only when sustained >1 A output or improved transient response is required; verify thermal margin with new layout. |
| MP1584EN-LF-Z | 3 A output; 1.5 MHz switching frequency; smaller external components; no integrated catch diode; requires external bootstrap capacitor. | Enables ultra-compact designs but increases layout sensitivity and noise filtering complexity; lacks TTL shutdown and thermal foldback. | Choose MP1584EN-LF-Z for space-constrained, high-density boards where 1.5 MHz operation is acceptable; LM2575M-ADJ remains preferred for robustness and simplicity. |
Compared with LM2576-ADJ and MP1584EN-LF-Z, the LM2575M-ADJ offers optimal balance of simplicity, proven reliability, and minimal external part count for 1 A applications - especially where thermal management, EMI predictability, and ease of qualification matter more than peak current or footprint reduction.
Availability
LM2575M-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card DC-DC converters, and positive-to-negative inverters requiring stable component supply and long-term BOM continuity.
Supply support for LM2575M-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 highly reliable, production-ready power ICs.
The LM2575 series was designed as a simple, robust replacement for three-terminal linear regulators - targeting cost-sensitive, thermally constrained industrial and embedded applications needing 1 A buck conversion with minimal external components.
FAQ
What is the maximum input voltage for LM2575M-ADJ?
The LM2575M-ADJ supports a maximum input voltage of 40 V under normal operating conditions. Exceeding this may trigger internal protection or cause permanent damage. The absolute maximum rating is 45 V, but operation above 40 V is not specified or guaranteed. Always refer to the LM2575M-ADJ datasheet for derating guidelines and thermal considerations at high VIN.
How do I set the output voltage for LM2575M-ADJ?
The LM2575M-ADJ output voltage is set using a two-resistor divider (R1 and R2) connected between output, feedback pin (Pin 4), and ground. With a precise 1.23 V internal reference, VOUT = 1.23 × (1 + R2/R1). R1 should be 1–5 kΩ (1% metal film recommended); for example, R1 = 2.0 kΩ and R2 = 6.12 kΩ yields 5 V. Layout must keep feedback traces short and away from noisy nodes to maintain accuracy.
Does LM2575M-ADJ include thermal protection?
Yes, the LM2575M-ADJ integrates thermal shutdown that disables the output switch when junction temperature exceeds approximately 150°C. Operation resumes automatically once the die cools below the hysteresis threshold (~135°C). This protects against sustained overload, inadequate heatsinking, or ambient temperature extremes - a critical safeguard confirmed in the LM2575M-ADJ electrical characteristics table.
What package type is LM2575M-ADJ supplied in?
The LM2575M-ADJ is supplied in a 5-lead TO-220 package (package code NDH0005D), with Pin 2 (Output) internally connected to the metal tab. This package supports direct mounting to heatsinks or large PCB copper areas. Thermal resistance is 65°C/W (junction-to-ambient, no heatsink) - proper thermal design is essential for full 1 A output capability.
Can LM2575M-ADJ be used in a buck-boost (inverting) configuration?
Yes, the LM2575M-ADJ can be configured as a positive-to-negative buck-boost converter by repositioning the inductor and diode - a standard application shown in TI's LM2575 datasheet (Figure 26 alternate connection). In this mode, it generates a regulated negative output (e.g., –5 V) from a positive input, leveraging the same internal switch and feedback architecture - confirmed in the official LM2575M-ADJ application notes.
LM2575M-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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:
- 24-SOIC
LM2575M-ADJ FAQ
1.How can I place an order for LM2575M-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575M-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 LM2575M-ADJ reliable?
The price and inventory of LM2575M-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575M-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575M-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575M-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575M-ADJ?
LM2575M-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575M-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 LM2575M-ADJ?
For technical support, including LM2575M-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575M-ADJ requirements.
6.How does Aetrix verify that LM2575M-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575M-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 LM2575M-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575M-ADJ?
All LM2575M-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575M-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 LM2575M-ADJ part is unused and in its original packaging.
Return procedure for LM2575M-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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