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Texas Instruments LM2575M-ADJ/NOPB
- Part No.:
- LM2575M-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575M-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
LM2575M-ADJ/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 5-pin TO-220 package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency operation, and integrated thermal shutdown/current limiting. It replaces linear regulators in mid-power DC/DC conversion for industrial power supplies and embedded systems requiring high efficiency and minimal external components.
For engineers reviewing the LM2575M-ADJ/NOPB datasheet, LM2575M-ADJ/NOPB pinout, LM2575M-ADJ/NOPB application, or LM2575M-ADJ/NOPB equivalent, key selection considerations include its ±4% output voltage tolerance over line/load, 40V max input voltage, TTL-compatible shutdown, and compatibility with standard off-the-shelf inductors - critical for cost-sensitive, thermally constrained buck converter designs.
Technical Context
The LM2575M-ADJ/NOPB implements a current-mode control architecture with an internal 52 kHz oscillator and cycle-by-cycle current limiting. Its feedback loop references a precise 1.23V bandgap voltage at the INH pin, enabling stable regulation across 1.23V–37V via external resistor dividers.
It integrates a 1A N-channel DMOS switch with 0.9V typical saturation voltage, operates from −40°C to +125°C junction temperature, and features thermal shutdown triggered above 150°C. Standby quiescent current is 50 μA typical when the ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports medium-power loads without external pass devices |
| Input Voltage Range | 4.75V to 40V - compatible with 5V, 12V, 24V, and 36V input rails |
| Output Voltage Range | 1.23V to 37V (adjustable) - set by external R1/R2 divider; 1.23V reference enables wide-range programmability |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency simplifies EMI filtering and inductor selection |
| Feedback Reference Voltage | 1.23V ±4% - defines output accuracy; determines VOUT = 1.23V × (1 + R2/R1) |
| Efficiency | 77% at VIN=12V, VOUT=5V, IOUT=1A - reduces heat sink requirements vs. linear regulators |
| Thermal Shutdown Threshold | 150°C junction - protects device during overload or poor heatsinking |
Pinout & Package
LM2575M-ADJ/NOPB uses a 5-lead TO-220 package (package code NDH0005D) with integral heat tab. Pin 3 is the exposed metal tab, electrically connected to Pin 2 (Output) and intended for thermal mounting to a heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | VIN supply connection | Accepts 4.75V–40V DC; requires local 100 μF/75V input capacitor |
| 2: Output | Switched output node | Drives inductor; connects to heatsink tab (Pin 3); must be decoupled with 330 μF output capacitor |
| 3: Tab | Thermal pad / Output tie | Electrically tied to Pin 2; must be soldered to PCB copper pour or heatsink for thermal management |
| 4: Feedback | Voltage sense input | Monitors output via R1/R2 divider; regulates to 1.23V at this pin |
| 5: ON/OFF | TTL-compatible enable control | Logic high (>2.2V) enables regulation; logic low (<0.8V) disables with 50 μA standby current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A power switch | Eliminates need for external MOSFET and gate driver in ≤1A buck designs |
| Fixed 52 kHz switching frequency | Enables predictable EMI profile and use of low-cost, standardized inductors |
| 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 |
| ±4% output voltage tolerance | Ensures stable regulation across full line/load/temperature range without trimming |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Generating 5V or 12V from 24V rail in PLC I/O modules or motor drive logic boards. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated DC power to microcontrollers and sensors. Use Value: Replaces linear regulators to eliminate heat sinks and reduce board area while maintaining ±4% output stability under load transients. |
Use Scenario: Providing 3.3V intermediate rail for FPGA core logic before final LDO post-regulation. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing voltage drop and thermal stress on downstream LDOs. Use Value: Achieves 77% efficiency at 1A, cutting total system power dissipation versus linear solutions and extending thermal margin. |
| On-Card DC/DC Converter | Positive-to-Negative Buck-Boost |
Use Scenario: Local 15V generation on a data acquisition card powered from a shared 28V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck converter minimizing inter-board cabling and noise coupling. Use Value: Requires only four external components (inductor, diode, two capacitors), accelerating layout and reducing BOM count. |
Use Scenario: Generating −5V from +12V for analog signal conditioning circuits using inverted topology. IC Role / Device Role / Timing Role: Configured as inverting buck-boost regulator via standard application circuit (Figure 25). Use Value: Leverages same IC and external parts as buck mode - no additional IC cost for dual-polarity supply generation. |
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-ADJ | TO-220 package with bent, staggered leads (vs. straight leads in M-suffix); identical electrical specs | No PCB layout change required - same footprint and thermal interface; differs only in lead form factor | Select LM2575T-ADJ for through-hole assembly requiring bent leads for manual insertion or wave soldering compatibility |
| LM2596-ADJ | Higher 3A output rating, 150 kHz switching frequency, improved efficiency (up to 92%), and tighter 1.23V reference (±1.5%) | Supports higher current loads and smaller passive components; requires redesign of inductor/capacitor values | Choose LM2596-ADJ when upgrading for >1A loads, lower ripple, or space-constrained layouts - not a drop-in replacement |
Compared with LM2575T-ADJ, LM2575M-ADJ/NOPB offers identical performance in a straight-lead TO-220 variant optimized for automated pick-and-place and reflow; versus LM2596-ADJ, it trades higher current and efficiency for proven robustness, lower EMI, and legacy design continuity in established 1A applications.
Availability
LM2575M-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card DC/DC converters, and positive-to-negative buck-boost applications requiring stable component supply and long-term manufacturability.
Supply support for LM2575M-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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2575 series was designed as a rugged, easy-to-use replacement for three-terminal linear regulators in medium-current DC/DC applications - prioritizing thermal resilience, minimal external parts, and broad industrial temperature operation.
FAQ
What is the maximum input voltage for LM2575M-ADJ/NOPB?
The LM2575M-ADJ/NOPB supports a maximum input voltage of 40V under normal operating conditions. This rating applies across the full −40°C to +125°C junction temperature range and is validated per the Absolute Maximum Ratings table in the official SNVS106E datasheet. Exceeding 40V may trigger internal protection or cause permanent damage.
How do I set the output voltage of LM2575M-ADJ/NOPB?
The output voltage of LM2575M-ADJ/NOPB is set using two external resistors (R1 and R2) forming a voltage divider from VOUT to GND, with the midpoint connected to the Feedback (Pin 4) terminal. The formula is VOUT = 1.23V × (1 + R2/R1), where R1 is typically 1kΩ–5kΩ. For example, R1 = 2.0kΩ and R2 = 6.12kΩ yields 5.0V output. Resistor tolerance directly impacts output accuracy.
Does LM2575M-ADJ/NOPB require a heat sink?
LM2575M-ADJ/NOPB can operate without an external heat sink at moderate loads and ambient temperatures, but thermal performance depends on PCB copper area and airflow. With the TO-220 package's θJA = 65°C/W (no heatsink, minimal copper), power dissipation above ~0.5W may exceed safe junction limits. Mounting the metal tab (Pin 3) to ≥4 in² of 2-oz copper significantly improves thermal resistance to ~45°C/W, enabling full 1A operation in most industrial environments.
What type of catch diode should be used with LM2575M-ADJ/NOPB?
A Schottky diode rated for ≥1.2× the maximum load current and ≥1.25× the maximum input voltage is recommended for LM2575M-ADJ/NOPB. For example, at VIN = 24V and ILOAD = 1A, a 30V/1.5A Schottky such as MBR130 or SR103 is appropriate. Fast-recovery diodes like UF4007 may be used if Schottky availability is limited, though efficiency will decrease due to higher forward voltage.
Is LM2575M-ADJ/NOPB RoHS compliant and lead-free?
Yes, LM2575M-ADJ/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per TI's product nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LM2575M-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
LM2575M-ADJ/NOPB FAQ
1.How can I place an order for LM2575M-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575M-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 LM2575M-ADJ/NOPB reliable?
The price and inventory of LM2575M-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 LM2575M-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575M-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575M-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575M-ADJ/NOPB?
LM2575M-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575M-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 LM2575M-ADJ/NOPB?
For technical support, including LM2575M-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575M-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2575M-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575M-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 LM2575M-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575M-ADJ/NOPB?
All LM2575M-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575M-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 LM2575M-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2575M-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575M-ADJ/NOPB Tags
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