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Texas Instruments LM2575N-ADJ
- Part No.:
- LM2575N-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575N-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
LM2575N-ADJ from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 5-lead TO-220 package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in mid-power DC/DC conversion applications such as industrial power supplies and embedded system pre-regulation.
For engineers reviewing the LM2575N-ADJ datasheet, LM2575N-ADJ pinout, LM2575N-ADJ application, or LM2575N-ADJ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives with documented differences, and supply support for production-grade sourcing.
Technical Context
The LM2575N-ADJ implements a fixed-frequency PWM buck topology with internal 52 kHz oscillator, N-channel MOSFET switch, and feedback comparator referenced to a precise 1.23V bandgap voltage. Its control loop relies on external RC compensation via the feedback network (R1/R2), with no internal frequency compensation beyond the fixed oscillator.
It operates in continuous conduction mode (CCM) across its full input range (4.75V–40V), delivering up to 1A output current while maintaining ±4% output voltage tolerance over line, load, and temperature. Protection includes thermal shutdown, peak current limiting (2.2A typical), and TTL-compatible ON/OFF control with 50 μA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports mid-power loads without external pass transistor or heat sink under typical conditions. |
| Input Voltage Range | 4.75V to 40V - compatible with 5V, 12V, 24V, and 36V nominal bus systems; excludes HV variant. |
| Output Voltage Range | 1.23V to 37V - set externally via R1/R2 divider; 1.23V reference enables precision programmability. |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator simplifies EMI filtering and inductor selection using standard off-the-shelf parts. |
| Feedback Reference Voltage | 1.230V ±2.2% - defines output accuracy baseline; actual VOUT = 1.23 × (1 + R2/R1). |
| Efficiency | 77% at VIN=12V, VOUT=5V, IOUT=1A - reduces thermal load vs. linear regulators; efficiency rises with higher VIN/VOUT ratios. |
| Quiescent Current | 5 mA typical - enables low-noise operation during active regulation; drops to 50 μA in TTL shutdown mode. |
Pinout & Package
LM2575N-ADJ uses a 5-lead TO-220 package (package number NDH0005D) with exposed tab electrically connected to Pin 2 (Output). Mounting requires thermal interface to heatsink or copper pour for >0.5A continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Unregulated DC input supply | Accepts 4.75–40V; requires local 100 μF/75V electrolytic bypass capacitor. |
| 2: Output | Regulated switched output node | Drives inductor and catch diode; tab connection enables thermal path to PCB/heatsink. |
| 3: Ground | Power and signal reference | Single-point ground connection required; separate from input/output capacitor grounds to minimize noise. |
| 4: Feedback | Resistor-divider sense input | Compares divided output against 1.23V reference; high-impedance (50 nA bias) for minimal divider loading. |
| 5: ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables switch and reduces IQ to 50 μA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A N-MOSFET switch | Eliminates need for external high-side switch; saturation voltage ≤0.9V at 1A reduces conduction loss. |
| Fixed 52 kHz oscillator | Enables use of low-cost, high-inductance, low-DCR toroidal inductors optimized for <100 kHz operation. |
| TTL shutdown with 50 μA standby | Supports low-power sleep modes in battery-backed or energy-conscious systems without auxiliary circuitry. |
| Cycle-by-cycle current limit | Protects against short-circuit and overload faults by limiting peak switch current to 2.2A (typical). |
| Thermal shutdown | Disables output when junction temperature exceeds ~150°C; auto-recovers after cooldown. |
Applications
| Industrial Power Supply | Embedded System Pre-Regulator |
|---|---|
Use Scenario: 24V rail conversion to 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing stable intermediate voltage before LDO post-regulation. Use Value: Reduces heat sink size by >70% versus linear solution; maintains ±4% output accuracy across -40°C to +85°C ambient. |
Use Scenario: On-board 12V-to-3.3V conversion for microcontroller, memory, and peripheral rails in edge gateways. IC Role / Device Role / Timing Role: High-efficiency DC/DC stage minimizing board-level thermal density and enabling compact layout. Use Value: Delivers 1A at 77% efficiency with only four external components; ON/OFF pin enables firmware-controlled power sequencing. |
| Positive-to-Negative Converter | Test Equipment Power Module |
Use Scenario: Generating -5V from +12V supply in analog front-end circuits requiring dual-rail op-amps. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using LM2575N-ADJ's grounded switch architecture. Use Value: Achieves regulated negative output without dedicated inverting IC; leverages same BOM and layout as positive versions. |
Use Scenario: Programmable bench power supply channel with user-selectable 3.3V/5V/12V outputs via resistor network. IC Role / Device Role / Timing Role: Adjustable-output core regulator supporting multiple voltage configurations from single PCB design. Use Value: Enables field-reconfigurable output via R1/R2 change; ±4% tolerance and 52 kHz switching ensure low ripple and predictable EMI profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-ADJ | Same die, TO-220 package with bent/staggered leads (NDH0005D vs. NDH0005D - identical mechanical outline); identical electrical specs. | No functional difference; lead form variation affects manual assembly or socket compatibility only. | Select LM2575T-ADJ if bent-lead TO-220 is required for vertical mounting or legacy socket fit. |
| LM2596-ADJ | Higher 3A output rating, 150 kHz switching frequency, improved efficiency (≥85% at 12V→5V), but requires different inductor/capacitor values and layout. | Supports higher current and tighter ripple specs; not drop-in due to differing compensation and pinout (no ON/OFF pin). | Choose LM2596-ADJ when >1A output or lower ripple is required; redesign needed for inductor, diode, and feedback network. |
Compared with LM2575T-ADJ, LM2575N-ADJ offers identical performance in straight-lead TO-220 packaging; versus LM2596-ADJ, it trades lower current and efficiency for proven reliability, simpler magnetics, and integrated enable functionality - making it optimal for cost-sensitive, thermally constrained 1A designs.
Availability
LM2575N-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, test equipment power modules, and positive-to-negative converter designs requiring stable component supply and long-term manufacturability.
Supply support for LM2575N-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 switching regulator design and manufacturing.
The LM2575 series was engineered as a robust, easy-to-use replacement for linear regulators in medium-current DC/DC applications, emphasizing simplicity (4 external parts), thermal resilience, and broad input voltage support for industrial and automotive subsystems.
FAQ
What is the maximum input voltage rating for LM2575N-ADJ?
The LM2575N-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 (LM2575HV-ADJ) supports up to 60V input.
How do I calculate the output voltage for LM2575N-ADJ?
The output voltage of LM2575N-ADJ is set by two external resistors: VOUT = 1.23V × (1 + R2/R1), where R1 connects from Feedback (Pin 4) to Ground and R2 connects from Output (Pin 2) to Feedback (Pin 4). R1 should be 1k–5kΩ; 1% metal film resistors are recommended for stability.
Does LM2575N-ADJ require an external diode, and what type is recommended?
Yes, LM2575N-ADJ requires an external Schottky catch diode (e.g., MBR340 or SR103) connected from Output (Pin 2) to Ground. The diode must handle ≥1.2× the maximum load current and have reverse voltage rating ≥1.25× VIN(Max); fast recovery or Schottky types minimize switching losses and voltage spikes.
Can LM2575N-ADJ be used in a buck-boost (inverting) configuration?
Yes, LM2575N-ADJ supports inverting buck-boost topology by grounding the Output pin (Pin 2) and taking the regulated negative output from the Switch node (Pin 1). This leverages its grounded-switch architecture and is documented in TI's application notes for generating negative voltages from positive inputs.
What thermal considerations apply to LM2575N-ADJ in TO-220 package?
In the 5-lead TO-220 package, LM2575N-ADJ has θJA = 65°C/W (no heatsink, minimal copper) or 45°C/W (with ~4 in² PCB copper). At 1A load and 12V→5V conversion, power dissipation is ~1.5W; derating is required above 85°C ambient unless heatsinked or mounted on large copper area.
LM2575N-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
LM2575N-ADJ FAQ
1.How can I place an order for LM2575N-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575N-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 LM2575N-ADJ reliable?
The price and inventory of LM2575N-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575N-ADJ is usually 5 days.
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LM2575N-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575N-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 LM2575N-ADJ?
For technical support, including LM2575N-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575N-ADJ requirements.
6.How does Aetrix verify that LM2575N-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575N-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 LM2575N-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575N-ADJ?
All LM2575N-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575N-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 LM2575N-ADJ part is unused and in its original packaging.
Return procedure for LM2575N-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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