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onsemi LM2575T-ADJ
- Part No.:
- LM2575T-ADJ
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2575T-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
LM2575T-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, and cycle-by-cycle current limiting - used in compact, high-efficiency DC-DC conversion for industrial power supplies and embedded systems.
For engineers reviewing the LM2575T-ADJ datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, confirmed pin functions, real-world application mappings, and two validated alternative parts with documented functional and application-level differences - all grounded in onsemi's official LM2575/D Rev. 14 datasheet.
Technical Context
The LM2575T-ADJ implements a fixed-frequency (52 kHz) voltage-mode buck converter architecture with an internal NPN switch, 1.23 V bandgap reference, error amplifier, and PWM comparator. Feedback is applied directly to Pin 4 (FB), enabling external resistor programming of output voltage via VOUT = 1.23 V × (1 + R2/R1).
It integrates cycle-by-cycle current limiting (1.7–3.0 A peak), thermal shutdown, TTL-compatible ON/OFF control (Pin 5), and a 1.0 V typical saturation voltage at 1.0 A. Standby quiescent current is 80 µA typical when disabled, and it operates across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0 A continuous - supports medium-power loads without external pass devices. |
| 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 ±4% - set externally with two resistors; reference accuracy enables stable regulation across temperature. |
| Switching Frequency | 52 kHz fixed (±10%) - balances EMI, inductor size, and efficiency; drops to ~18 kHz under overload for self-protection. |
| Feedback Reference Voltage | 1.23 V ±2.7% (−40°C to +125°C) - defines output scaling ratio and sets minimum achievable output. |
| Thermal Shutdown Threshold | Internally triggered above ~150°C junction - protects against sustained overload or poor heatsinking. |
| Standby Quiescent Current | 80 µA typical - enables low-power system sleep modes without external enable circuitry. |
Pinout & Package
LM2575T-ADJ is supplied in TO-220 package (Case 314D, T suffix), with Pin 3 (GND) electrically connected to the heatsink tab for thermal conduction and electrical grounding. The package requires mechanical mounting to a heatsink for >0.5 A continuous operation at elevated ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 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. |
| Pin 2: Output | Emitter of internal NPN switch | Drives inductor; 1.0 V typical saturation drop at 1.0 A; PCB copper area must be minimized to reduce EMI coupling. |
| Pin 3: GND | Circuit ground reference | Common return for internal circuits and heatsink tab; must be single-point grounded near input/output capacitors per layout guidelines. |
| Pin 4: Feedback | Error amplifier non-inverting input | Direct connection point for external resistor divider; high-impedance node (25–200 nA bias) requiring short, noise-immune routing. |
| Pin 5: ON/OFF | Logic-controlled enable/disable | TTL-compatible: ≤1.2 V = ON, ≥2.2 V = OFF; draws ≤30 µA when high; enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.23 V to 37 V set by two external resistors - eliminates need for multiple fixed-voltage SKUs and simplifies BOM management. |
| Integrated protection | Cycle-by-cycle current limit + thermal shutdown - prevents damage during short-circuit, overload, or inadequate cooling without external sensing. |
| Low external component count | Only 4 required components (inductor, diode, input cap, output cap) - reduces design time, board space, and qualification effort. |
| High efficiency at wide input range | Up to 88% efficiency (e.g., 15 V out @ 1.0 A from 18 V in) - minimizes heat generation and eliminates heatsink in many low-power applications. |
| TTL shutdown capability | 80 µA standby current with logic-level disable - supports low-power sleep states in battery-powered or energy-conscious systems. |
Applications
| Industrial Power Supply | Embedded System DC-DC Conversion |
|---|---|
|
Use Scenario: Generating 5 V or 12 V from a 24 V factory bus for PLC I/O modules or sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, regulated rail with built-in fault protection. Use Value: Eliminates linear pre-regulator losses; 88% efficiency at 12 V out reduces thermal load in enclosed enclosures. |
Use Scenario: Converting 12 V vehicle battery to 3.3 V for microcontroller and peripheral logic in automotive telematics units. IC Role / Device Role / Timing Role: Buck converter with wide input range handling cold-crank (4.75 V) and load-dump (40 V) transients. Use Value: Guaranteed 1.0 A output sustains processor + RF + CAN transceiver loads; thermal shutdown prevents field failure. |
| Battery Charger Power Stage | Positive-to-Negative Converter |
|
Use Scenario: Providing constant-current/constant-voltage charging for 3-cell Li-ion packs using programmable feedback network. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured as CV stage with external current-sense and control loop. Use Value: 1.23 V reference enables precise voltage setting; ±4% output tolerance ensures cell voltage compliance per JEITA standards. |
Use Scenario: Generating −5 V rail from +12 V supply for op-amp biasing or analog signal conditioning in test equipment. IC Role / Device Role / Timing Role: Used in inverting buck-boost topology (with modified external components) to produce negative output. Use Value: Fixed 52 kHz frequency simplifies filter design; internal switch handles 1.0 A, supporting moderate-current negative rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ | Higher 3.0 A output current, 150 kHz switching frequency, lower dropout, but requires larger output capacitor for stability. | Better suited for higher-current loads (>1.2 A); higher frequency allows smaller inductors but increases EMI filtering complexity. | Select LM2596T-ADJ when >1.0 A output or tighter ripple specs are required; verify layout for 150 kHz operation. |
| MP1584EN-LF-Z | 2.5 A output, 1.5 MHz switching, integrated soft-start, but narrower 4.5–28 V input range and no built-in thermal shutdown latch. | Ideal for space-constrained designs needing small LC filters; less robust for 40 V transients or sustained overload conditions. | Choose MP1584EN-LF-Z for compact consumer-grade supplies; avoid in automotive or industrial environments with >28 V surges. |
Compared with LM2575T-ADJ, LM2596T-ADJ offers higher current and frequency at the cost of increased design sensitivity, while MP1584EN-LF-Z trades ruggedness and voltage range for integration and footprint - making LM2575T-ADJ optimal for cost-sensitive, thermally demanding, or wide-input industrial buck applications.
Availability
LM2575T-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and battery charger power stages requiring stable component supply, long-term lifecycle support, and proven reliability in harsh environments.
Supply support for LM2575T-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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a robust, easy-to-use monolithic buck regulator family targeting cost-sensitive industrial and embedded applications where simplicity, thermal resilience, and wide input range outweigh ultra-high efficiency or miniaturization.
FAQ
What is the minimum input voltage required for LM2575T-ADJ to regulate at 5.0 V output?
The LM2575T-ADJ requires a minimum input voltage of approximately 7.0 V to sustain 5.0 V output at full 1.0 A load, due to its 1.0 V typical saturation voltage and necessary headroom for feedback loop stability. Datasheet specifies guaranteed operation down to 4.75 V input, but output regulation at 5.0 V is only assured above ~6.5 V under typical conditions - always verify with worst-case VSAT and load.
Can LM2575T-ADJ be used in a negative-output configuration?
Yes, LM2575T-ADJ can be configured as a positive-to-negative buck-boost converter by repositioning the inductor and diode - a standard application shown in the official datasheet (page 2). In this mode, LM2575T-ADJ regulates the magnitude of the negative output, but note that feedback sensing and component stress differ from standard buck operation.
What is the purpose of the ON/OFF pin (Pin 5) on LM2575T-ADJ?
Pin 5 provides TTL-compatible logic control: applying ≤1.2 V enables the LM2575T-ADJ, while ≥2.2 V disables it, reducing total input current to 80 µA typical. This allows system-level power sequencing, battery-saving sleep modes, or fault-initiated shutdown - all without external MOSFETs or level shifters.
How do I calculate the feedback resistors for a 12 V output using LM2575T-ADJ?
Use VOUT = 1.23 V × (1 + R2/R1). For 12 V, select R1 = 1.2 kΩ (standard value), then R2 = R1 × ((12 V / 1.23 V) − 1) ≈ 10.5 kΩ - use a 10.5 kΩ or 10.7 kΩ 1% metal film resistor. R1 should be between 1.0 kΩ and 5.0 kΩ for optimal temperature stability, as specified in the LM2575T-ADJ datasheet.
Is LM2575T-ADJ still in active production and supported by onsemi?
LM2575T-ADJ remains actively manufactured and supported by onsemi, with datasheet Rev. 14 published March 2025. It is not listed among discontinued devices in the official ordering table (page 24), and distributor stock (Digi-Key, Mouser) confirms ongoing availability with full technical documentation and application guidance.
LM2575T-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- 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
LM2575T-ADJ FAQ
1.How can I place an order for LM2575T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-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 LM2575T-ADJ reliable?
The price and inventory of LM2575T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-ADJ?
LM2575T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-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 LM2575T-ADJ?
For technical support, including LM2575T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-ADJ requirements.
6.How does Aetrix verify that LM2575T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575T-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 LM2575T-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575T-ADJ?
All LM2575T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-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 LM2575T-ADJ part is unused and in its original packaging.
Return procedure for LM2575T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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