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Texas Instruments LM2575MX-ADJ/NOPB
- Part No.:
- LM2575MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,160
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Product details
Overview
LM2575MX-ADJ/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with adjustable output (1.23V to 37V), 52 kHz fixed-frequency internal oscillator, and integrated power switch. It delivers ±4% output voltage accuracy across line/load conditions, supports wide 40V input range, and requires only four external components - enabling compact, high-efficiency replacements for linear regulators in industrial power supplies.
For engineers reviewing the LM2575MX-ADJ/NOPB datasheet, LM2575MX-ADJ/NOPB pinout, LM2575MX-ADJ/NOPB application, or LM2575MX-ADJ/NOPB equivalent, this device is selected for cost-sensitive, medium-power DC-DC conversion where thermal performance, minimal BOM count, and proven reliability under continuous 1A load are critical design requirements.
Technical Context
The LM2575MX-ADJ/NOPB implements a current-mode PWM buck topology with cycle-by-cycle current limiting and thermal shutdown protection. Its internal 52 kHz oscillator sets switching frequency independent of input/output conditions, simplifying EMI filtering and inductor selection using standard off-the-shelf parts.
Feedback is taken from the ADJ pin referencing a precise 1.23V internal bandgap reference; output voltage is set externally via resistor divider (R1/R2). The ON/OFF pin enables TTL-compatible shutdown with 50 μA standby current, while saturation voltage remains ≤1.4 V at 1A peak switch current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports full-load operation without external current boosting |
| Input Voltage Range | 40 V max - compatible with unregulated 24V/36V industrial rails and automotive battery systems |
| Output Voltage Range | 1.23 V to 37 V - programmable via two-resistor feedback network for flexible system-level regulation |
| Feedback Reference Voltage | 1.23 V ±1.2% - enables accurate output setting with standard 1% metal-film resistors |
| Switching Frequency | 52 kHz fixed - ensures predictable filter design and low EMI without external timing components |
| Efficiency | 77% at 12 VIN/5 VOUT/1 A - reduces heat sink requirements versus linear alternatives |
| Thermal Resistance (θJA) | 100 °C/W (SOIC package) - defines maximum power dissipation limit under natural convection |
Pinout & Package
LM2575MX-ADJ/NOPB is housed in a 5-pin SOIC (Small Outline Integrated Circuit) surface-mount package (package code NFE0024B per TI documentation), optimized for automated assembly and moderate power density.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Accepts 4.75–40 V DC; requires local 100 µF electrolytic bypass capacitor |
| 2 - OUTPUT | Switch node | Drives external catch diode and inductor; carries pulsed 1A switch current |
| 3 - GND | Power and signal ground | Common return for input cap, output cap, and feedback network; single-point grounding recommended |
| 4 - FEEDBACK (ADJ) | Regulation sense | Connects to resistor divider midpoint; references internal 1.23 V bandgap for output programming |
| 5 - ON/OFF | Enable control | TTL-compatible shutdown: <1.0 V = ON, >2.2 V = OFF; draws ≤30 µA in standby |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A power switch | Eliminates need for external MOSFET and gate driver, reducing layout complexity and component count |
| Fixed 52 kHz oscillator | Enables use of standardized, low-cost inductors and simplifies EMI compliance testing |
| TTL shutdown with 50 µA standby | Supports low-power sleep modes in battery-backed or energy-conscious systems |
| Internal thermal shutdown & current limit | Provides autonomous fault protection without external sensing circuitry |
| Requires only 4 external components | Minimizes BOM cost and PCB area - input cap, output cap, catch diode, and feedback resistors |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
|
Use Scenario: Generating stable 5 V or 12 V rail from 24 V factory bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated DC power to microcontroller, sensors, and digital logic. Use Value: Replaces linear regulators to eliminate heat sink requirements and improve efficiency from ~40% to >75% at 1A load. |
Use Scenario: On-board DC-DC conversion for FPGA or ARM-based edge computing module powered by 12 V adapter. IC Role / Device Role / Timing Role: Adjustable buck converter configured for 3.3 V or 1.8 V core supply with tight load regulation. Use Value: Achieves ±4% output accuracy over temperature and line variation using only two precision resistors. |
| Test Equipment Power Rail | LED Driver Bias Supply |
|
Use Scenario: Providing clean, low-noise 15 V bias for analog front-end circuits in portable multimeters. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulator to suppress switching noise. Use Value: Delivers 1A output with 52 kHz fundamental frequency easily filtered by small LC stage before LDO input. |
Use Scenario: Constant-voltage supply for LED string bias in signage or indicator panels operating from 24 V DC source. IC Role / Device Role / Timing Role: Efficient constant-voltage source driving series-connected LEDs via external current-limiting resistor. Use Value: Maintains stable LED brightness across input voltage fluctuations (e.g., 18–32 V vehicle supply). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576MX-ADJ/NOPB | Higher 3A output current rating; 52 kHz frequency; wider 40 V input range; requires larger inductor | Better suited for higher-current loads (>1.2 A); same pinout but higher thermal mass | Select when sustained >1A load or higher transient current margin is required |
| MP1584EN-LF-Z | 2A output; 1.5 MHz switching frequency; smaller external components; no built-in thermal shutdown | Enables ultra-compact designs but demands careful thermal layout and external fault protection | Prefer for space-constrained applications where board area is prioritized over legacy compatibility |
Compared with LM2575MX-ADJ/NOPB, LM2576MX-ADJ/NOPB offers higher current headroom at identical footprint, while MP1584EN-LF-Z trades robustness for miniaturization - making LM2575MX-ADJ/NOPB optimal for cost-sensitive, thermally stable 1A industrial supplies where proven reliability outweighs size reduction.
Availability
LM2575MX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded controller boards, and test equipment requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM2575MX-ADJ/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2575MX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and rugged operation in industrial and commercial DC-DC applications.
FAQ
What is the maximum input voltage rating for LM2575MX-ADJ/NOPB?
The LM2575MX-ADJ/NOPB has an absolute maximum input voltage of 45 V and an operating maximum of 40 V. Exceeding 40 V during normal operation risks violating specifications; for 60 V input applications, the LM2575HVM-ADJ variant must be used instead. Always observe derating guidelines per TI SNVS106E.
How is output voltage programmed on LM2575MX-ADJ/NOPB?
Output voltage is set using a resistor divider between OUTPUT and GND, with the ADJ pin connected to the midpoint. The formula is VOUT = 1.23 V × (1 + R2/R1), where R1 connects ADJ to GND and R2 connects OUTPUT to ADJ. TI recommends R1 = 1 kΩ–5 kΩ and 1% metal-film resistors for stability.
Does LM2575MX-ADJ/NOPB require an external catch diode?
Yes - LM2575MX-ADJ/NOPB requires an external Schottky or fast-recovery diode (e.g., MBR340 or SR103) connected from OUTPUT to GND. This diode provides the freewheeling path during switch-off cycles; omission causes catastrophic failure due to inductive kickback at the OUTPUT pin.
What thermal considerations apply to LM2575MX-ADJ/NOPB in SOIC package?
In its SOIC-8 package (NFE0024B), LM2575MX-ADJ/NOPB has θJA = 100 °C/W. At 1A load and 12 V input → 5 V output, power dissipation is ~1.4 W, resulting in ~140 °C junction rise above ambient - exceeding 125 °C max rating. Adequate copper pour, airflow, or reduced load is mandatory for reliable operation.
Can LM2575MX-ADJ/NOPB be synchronized to an external clock?
No - LM2575MX-ADJ/NOPB uses an internal fixed-frequency 52 kHz oscillator with no synchronization input. Frequency cannot be adjusted or locked to external sources. For synchronizable buck regulators, consider TI's TPS543x or MPQ4420A families instead.
LM2575MX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM2575MX-ADJ/NOPB FAQ
1.How can I place an order for LM2575MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575MX-ADJ/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 LM2575MX-ADJ/NOPB reliable?
The price and inventory of LM2575MX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575MX-ADJ/NOPB?
LM2575MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575MX-ADJ/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 LM2575MX-ADJ/NOPB?
For technical support, including LM2575MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2575MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575MX-ADJ/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 LM2575MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575MX-ADJ/NOPB?
All LM2575MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575MX-ADJ/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 LM2575MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2575MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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