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onsemi LM2575TV-ADJ
- Part No.:
- LM2575TV-ADJ
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575TV-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
LM2575TV-ADJ from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with adjustable output voltage from 1.23 V to 37 V, ±4% tolerance over line and load, operating from 4.75 V to 40 V input, and featuring internal 52 kHz oscillator, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in compact, high-efficiency DC-DC conversion for industrial power supplies and embedded systems.
For engineers reviewing the LM2575TV-ADJ datasheet, pinout, applications, or equivalent options, key selection considerations include its fixed-frequency buck architecture, feedback reference voltage of 1.23 V, 1.0 A guaranteed output capability, TO-220-5 package with heatsink-connected ground pin, and compatibility with standard off-the-shelf inductors and Schottky catch diodes.
Technical Context
The LM2575TV-ADJ implements a voltage-mode controlled buck converter with an internal NPN switch, fixed 52 kHz oscillator, and error amplifier referenced to a 1.23 V bandgap. Regulation is achieved by comparing feedback voltage at Pin 4 against this reference and adjusting duty cycle via pulse-width modulation.
It integrates cycle-by-cycle current limiting (1.4–3.2 A peak), thermal shutdown, and a dedicated ON/OFF pin (Pin 5) enabling logic-level shutdown with ≤80 µA standby current. The output stage uses emitter-follower topology (Pin 2 = switch emitter), requiring external catch diode and inductor for energy transfer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.0 A continuous - supports medium-power loads without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - enables direct operation from 5 V, 12 V, 24 V, or unregulated battery/bus rails. |
| Output Voltage Range | 1.23 V to 37 V adjustable via external resistor divider - covers wide range of system supply needs. |
| Feedback Reference | 1.23 V ±2% (0°C to 125°C) - sets precision of output programming; determines R1/R2 ratio. |
| Switching Frequency | 52 kHz fixed (±10% over temp) - balances EMI, inductor size, and efficiency; reduces filter component cost. |
| Efficiency | Up to 77% at 12 VIN/5 VOUT/1 A - significantly higher than linear regulators, minimizing heat dissipation. |
| Standby Current | 80 µA typical at shutdown - enables low-power system sleep modes without auxiliary LDOs. |
Pinout & Package
LM2575TV-ADJ is housed in a TO-220-5 (Case 314B) package with exposed heatsink surface electrically connected to Pin 3 (GND). The package supports vertical mounting with heatsinking to PCB or external heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local low-ESR bypass capacitor (e.g., 100 µF) to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.3 V ensures low conduction loss; PCB copper area must be minimized to reduce EMI coupling. |
| 3 - GND | Circuit ground / heatsink connection | Common return for all internal circuits; metal tab is electrically tied to this pin - critical for thermal and noise performance. |
| 4 - Feedback | Error amplifier non-inverting input | Directly senses output via resistor divider; 25–200 nA bias current allows use of high-value resistors (e.g., 1–10 kΩ) for low quiescent error. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA when active, enabling microcontroller-based power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.0 A NPN switch | Eliminates need for external power transistor - reduces BOM count and layout complexity. |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and simplifies filter design using standardized inductor families. |
| Thermal shutdown + current limit | Provides autonomous fault protection under overload, short-circuit, or inadequate heatsinking conditions. |
| Adjustable output (1.23–37 V) | Supports custom rail generation (e.g., 3.3 V, 9 V, 15 V, 24 V) with only two external resistors - no variant stocking required. |
| TTL shutdown with 80 µA standby | Allows system-level power management without external enable circuitry or leakage-sensitive bias networks. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
|
Use Scenario: Generating stable 5 V or 12 V from 24 V factory bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24 V to isolated 5 V logic rail. Use Value: Delivers 1.0 A with 77% efficiency and no heatsink needed - reduces thermal design overhead and board space. |
Use Scenario: Providing configurable 3.3 V or adjustable 1.8 V supply for FPGA core or MCU in portable instrumentation. IC Role / Device Role / Timing Role: Adjustable buck controller setting precise output via resistor network; enabled/disabled by host processor. Use Value: ±4% output tolerance and 1.23 V reference ensure accurate rail compliance; 80 µA shutdown extends battery life. |
| On-Card DC-DC Converter | Battery Charger Pre-Regulator |
|
Use Scenario: Replacing linear regulators on dense PCBs where heat dissipation is constrained. IC Role / Device Role / Timing Role: High-efficiency buck converter replacing 7805-style LDOs in space-constrained applications. Use Value: 52 kHz switching allows small 330 µH inductors and avoids audible noise - ideal for fanless enclosures. |
Use Scenario: Stepping down 19 V laptop adapter output to 12 V intermediate rail before linear charging IC. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing dropout and thermal stress on downstream linear charger. Use Value: Operates down to 4.75 V input - supports brownout resilience; current limiting protects during battery fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576TV-ADJ | Higher 3.0 A output current, 52 kHz frequency, wider input (4–40 V), but larger dropout and higher quiescent current (10 mA vs. 5 mA). | Preferred for >1 A loads or higher reliability margin; less suitable for ultra-low-quiescent designs. | Select when output current >1.0 A is required and board space allows larger TO-220 package. |
| MP1584EN-LF-Z | 4.5–28 V input, 3 A output, 1.5 MHz switching, smaller SOT-23-8 package, but requires external compensation and lacks integrated thermal shutdown latch. | Better for compact, high-density layouts; not drop-in due to different pinout, frequency, and control architecture. | Choose for space-constrained designs needing >1 A and higher frequency; verify loop stability with external components. |
Compared with LM2576TV-ADJ and MP1584EN-LF-Z, the LM2575TV-ADJ offers optimal balance of simplicity (4 external parts), proven ruggedness (integrated protections), and thermal performance in TO-220 - making it ideal for cost-sensitive, medium-current industrial power rails where layout simplicity and long-term reliability are prioritized over miniaturization or ultra-high current.
Availability
LM2575TV-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, on-card DC-DC conversion, and battery charger pre-regulation requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for LM2575TV-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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, and intelligent power solutions.
The LM2575 series was designed as a robust, easy-to-use monolithic buck regulator family targeting cost-sensitive industrial, automotive (NCV variant), and general-purpose power applications - emphasizing minimal external components and field-proven reliability.
FAQ
What is the minimum input voltage required for LM2575TV-ADJ to regulate at 5 V output?
The LM2575TV-ADJ requires a minimum input voltage of 4.75 V to maintain regulation. At 5 V output, the dropout headroom is determined by switch saturation voltage (≤1.3 V) and diode forward drop (~0.4 V), so practical minimum Vin is ~6.7 V for full-load operation. Datasheet specifies 4.75 V absolute minimum for all versions, but regulation margin decreases near that limit. LM2575TV-ADJ remains functional but may exhibit reduced line regulation or increased ripple below ~7 V input at 1 A load.
Can LM2575TV-ADJ be used in synchronous rectification configurations?
No, LM2575TV-ADJ cannot be used in synchronous rectification configurations. It features an NPN bipolar output switch with emitter output (Pin 2), and does not provide gate drive signals or timing control for an external synchronous MOSFET. The design relies on an external Schottky catch diode (e.g., 1N5819) for freewheeling. Synchronous operation would require a controller with complementary high-side/low-side drivers - which LM2575TV-ADJ does not implement.
What is the recommended feedback resistor configuration for 3.3 V output with LM2575TV-ADJ?
For 3.3 V output, use R1 = 1.0 kΩ and R2 = 1.7 kΩ (1% metal film), per datasheet Table on page 2. This yields VOUT = 1.23 × (1 + R2/R1) = 1.23 × (1 + 1.7) = 3.32 V. R1 must be between 1.0 kΩ and 5.0 kΩ for stability and temperature coefficient; values outside this range risk poor regulation or oscillation. LM2575TV-ADJ's feedback node draws only 25–200 nA, so resistor power dissipation is negligible.
Does LM2575TV-ADJ require a minimum load to maintain regulation?
No, LM2575TV-ADJ does not require a minimum load for regulation. Its voltage-mode control architecture and internal error amplifier remain stable from zero load up to 1.0 A. However, light-load efficiency drops due to fixed switching losses and quiescent current (~5 mA), and output ripple may increase slightly at very low currents (<50 mA). LM2575TV-ADJ maintains ±4% output accuracy across 0–1.0 A load range per datasheet specifications.
How is thermal performance affected when LM2575TV-ADJ is mounted without a heatsink?
When LM2575TV-ADJ is mounted on a standard FR-4 PCB with no external heatsink, its junction-to-ambient thermal resistance is 65°C/W (TO-220 Case 314B). At 1.0 A output into 5 V with 12 V input (77% efficiency), power dissipation is ~1.5 W - resulting in ~98°C junction rise above ambient. With 25°C ambient, TJ ≈ 123°C, within the −40°C to +125°C operating range but near thermal shutdown threshold. LM2575TV-ADJ will activate thermal shutdown if TJ exceeds 150°C, so moderate heatsinking is recommended for sustained full-load operation.
LM2575TV-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- TO-220-5
LM2575TV-ADJ FAQ
1.How can I place an order for LM2575TV-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575TV-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 LM2575TV-ADJ reliable?
The price and inventory of LM2575TV-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575TV-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575TV-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575TV-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575TV-ADJ?
LM2575TV-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575TV-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 LM2575TV-ADJ?
For technical support, including LM2575TV-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575TV-ADJ requirements.
6.How does Aetrix verify that LM2575TV-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575TV-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 LM2575TV-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575TV-ADJ?
All LM2575TV-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575TV-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 LM2575TV-ADJ part is unused and in its original packaging.
Return procedure for LM2575TV-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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