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onsemi LM2575D2T-ADJ
- Part No.:
- LM2575D2T-ADJ
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
LM2575D2T-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 LM2575D2T-ADJ datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A output capability, feedback reference voltage of 1.23 V, standby quiescent current of 80 µA, fixed 52 kHz switching frequency, and D2PAK (TO-263) package with heatsink-connected ground pin.
Technical Context
The LM2575D2T-ADJ integrates a 1.0 A NPN switch, error amplifier, 1.23 V bandgap reference, 52 kHz oscillator, and protection circuitry including thermal shutdown and cycle-by-cycle current limiting. It operates in continuous conduction mode and uses external components (inductor, diode, input/output capacitors, and feedback resistors) to configure output voltage and optimize transient response.
Its voltage-mode control architecture relies on feedback of the regulated output via an external resistor divider connected to the Feedback (Pin 4) terminal. The ON/OFF pin (Pin 5) enables TTL-compatible shutdown with 1.4 V typical threshold, reducing total supply current to ~80 µA in standby.
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 - accommodates wide-range unregulated inputs including 12 V, 24 V, and 36 V battery or adapter sources. |
| Output Voltage Range | 1.23 V to 37 V adjustable via external resistor divider - enables flexible regulation across analog, digital, and mixed-signal rails. |
| Feedback Reference Voltage | 1.23 V ±2% (0°C to 125°C) - sets precision of output programming; determines R1/R2 ratio for target VOUT. |
| Switching Frequency | 52 kHz fixed (±10% over temperature) - enables use of low-cost, standard inductors and simplifies EMI filtering design. |
| Standby Quiescent Current | 80 µA typical at 25°C - ensures ultra-low power consumption during system sleep or shutdown modes. |
| Saturation Voltage | 1.0 V typical at 1.0 A - defines minimum dropout headroom and impacts efficiency at low VIN–VOUT differentials. |
Pinout & Package
D2PAK (TO-263-5) package with exposed heatsink pad electrically connected to Pin 3 (GND); requires PCB copper area for thermal dissipation and EMI reduction.
| 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; saturation voltage ≤1.2 V at 1.0 A; PCB trace area must be minimized to reduce coupling into sensitive circuits. |
| Pin 3: GND | Circuit ground / heatsink connection | Common return for all internal circuitry; exposed pad must be soldered to large copper plane for thermal management and noise control. |
| Pin 4: Feedback | Error amplifier non-inverting input | Directly senses output via external R1/R2 divider; high-impedance node requiring short, shielded routing near IC. |
| Pin 5: ON/OFF | Logic-controlled enable/disable | TTL-compatible input; <1.4 V = "on", >2.2 V = "off"; draws <30 µA when active, enabling low-power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.0 A switch | Eliminates need for external MOSFET or transistor, reducing BOM count and layout complexity in buck designs. |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and compatibility with off-the-shelf inductors optimized for this frequency. |
| Thermal shutdown + current limit | Provides autonomous fault protection under overload, short-circuit, or inadequate heatsinking conditions. |
| Adjustable output (1.23–37 V) | Supports single-IC reuse across multiple voltage rails using only two external resistors - no redesign required. |
| 80 µA standby current | Permits energy-sensitive applications (e.g., battery-backed systems) to maintain regulation readiness with negligible drain. |
Applications
| Industrial Power Supply | Embedded System DC-DC Conversion |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, efficient, and protected intermediate rail. Use Value: Delivers 1.0 A at >77% efficiency with minimal external parts, reducing board space and thermal load vs. linear regulators. |
Use Scenario: Generating 12 V and 5 V rails from a 28 V avionics bus in flight control computers. IC Role / Device Role / Timing Role: Adjustable buck converter configured for dual-rail generation via resistor reconfiguration. Use Value: Single-part flexibility avoids stocking multiple fixed-output variants; 52 kHz frequency eases compliance with airborne EMI limits. |
| Battery Charger Pre-regulator | On-Card Switching Supply |
|
Use Scenario: Stepping down 36 V LiFePO₄ pack voltage to 15 V for constant-current charging stage. IC Role / Device Role / Timing Role: Efficient pre-regulator preceding linear charger IC to minimize heat dissipation. Use Value: High input voltage tolerance (up to 40 V) and 1.0 A output support fast-charging topologies without derating. |
Use Scenario: Local 3.3 V supply for FPGA configuration and I/O banks on high-density compute cards. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator placed directly adjacent to load. Use Value: D2PAK thermal performance and integrated switch allow full 1.0 A delivery in space-constrained layouts without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-ADJ | Higher peak current limit (3.0 A), lower quiescent current (5.0 mA active), 52 kHz same frequency, TO-220/D2PAK options. | Preferred where higher surge current or tighter load transient response is required; larger footprint in TO-220 variant. | Select LM2576-ADJ if output short-circuit robustness or dynamic load handling exceeds LM2575D2T-ADJ's 1.0 A continuous rating. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, 3 A output, but requires external compensation and lacks integrated catch diode driver. | Better suited for space-constrained portable designs; not drop-in due to different pinout, control scheme, and external component requirements. | Choose MP1584EN-LF-Z only when board area is critical and design team can implement high-frequency layout best practices. |
Compared with LM2575D2T-ADJ, LM2576-ADJ offers greater current headroom and identical frequency, while MP1584EN-LF-Z trades simplicity and ruggedness for miniaturization and higher bandwidth - making LM2575D2T-ADJ optimal for cost-sensitive, thermally constrained, fixed-frequency industrial applications.
Availability
LM2575D2T-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and battery charger pre-regulators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575D2T-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 manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed for simple, reliable, and cost-effective buck conversion in industrial and embedded applications - prioritizing ease of use, thermal robustness, and minimal external component count over ultra-high frequency or digital control.
FAQ
What is the maximum input voltage rating for LM2575D2T-ADJ?
The absolute maximum input voltage for LM2575D2T-ADJ is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V may trigger internal protection or reduce reliability; sustained operation above this level is not guaranteed and risks damage. Always verify input transient margins in the final design.
How do I calculate the feedback resistors for a desired output voltage with LM2575D2T-ADJ?
Use the formula VOUT = 1.23 V × (1 + R2/R1), where R1 connects from Feedback (Pin 4) to GND and R2 connects from Output (Pin 2) to Feedback (Pin 4). Select R1 between 1.0 kΩ and 5.0 kΩ (1% metal film recommended), then solve for R2. For example, for 12 V output: R2 = R1 × (12/1.23 − 1) ≈ R1 × 8.75.
Does LM2575D2T-ADJ require an external catch diode, and what type is recommended?
Yes, LM2575D2T-ADJ requires an external Schottky catch diode (e.g., 1N5819, MBR320) rated for ≥1.2× the maximum load current and ≥1.25× the maximum input voltage. The diode conducts during the switch "off" period and must handle peak currents up to the IC's current limit (~3 A). Fast recovery or ultra-low forward voltage types improve efficiency.
What thermal considerations apply to LM2575D2T-ADJ in D2PAK package?
The D2PAK package has RJC = 5.0 °C/W and RJA = 70 °C/W (with PCB copper). To maintain TJ ≤ 125°C at 1.0 A, ensure ≥4 cm² of 2-oz copper connected to Pin 3 (GND/heatsink pad), use thermal vias, and avoid enclosing the device. Derate output current above 70°C ambient per the thermal curves in the datasheet.
Can LM2575D2T-ADJ be synchronized to an external clock?
No, LM2575D2T-ADJ does not support external clock synchronization. Its 52 kHz oscillator is fully internal and fixed-frequency. Attempting to force sync via ON/OFF pin modulation causes unstable regulation and is not supported. For synchronizable alternatives, consider modern controllers like LM5116 or MPQ4312.
LM2575D2T-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2575D2T-ADJ FAQ
1.How can I place an order for LM2575D2T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-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 LM2575D2T-ADJ reliable?
The price and inventory of LM2575D2T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2575D2T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-ADJ?
LM2575D2T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-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 LM2575D2T-ADJ?
For technical support, including LM2575D2T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-ADJ requirements.
6.How does Aetrix verify that LM2575D2T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-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 LM2575D2T-ADJ meets industry standards.
7.What is the process for return or replacement of LM2575D2T-ADJ?
All LM2575D2T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-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 LM2575D2T-ADJ part is unused and in its original packaging.
Return procedure for LM2575D2T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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