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onsemi LM2575D2T-ADJR4
- Part No.:
- LM2575D2T-ADJR4
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-ADJR4.pdf
- Description:
- IC REG BUCK ADJ 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
LM2575D2T-ADJR4 from onsemi is an adjustable-output, 1.0 A step-down (buck) switching regulator in D2PAK (TO-263) package with 52 kHz fixed-frequency operation, 4.75 V to 40 V input range, and ±4% output voltage accuracy over line/load/temperature. It delivers high efficiency-up to 77% at 12 VIN/5 VOUT/1 A-for compact DC-DC conversion in industrial power supplies.
For engineers reviewing the LM2575D2T-ADJR4 datasheet, pinout, applications, or equivalent options, key selection criteria include its adjustable 1.23 V–37 V output range, integrated 1.0 A switch with thermal shutdown and cycle-by-cycle current limiting, TTL-compatible ON/OFF control, and minimal external component count (only 4 required).
Technical Context
The LM2575D2T-ADJR4 implements a voltage-mode controlled buck converter with a fixed 52 kHz oscillator and internal 1.23 V bandgap reference. Its feedback pin (Pin 4) connects directly to the error amplifier's non-inverting input, enabling precise output programming via external resistor divider (R1/R2).
It features cycle-by-cycle current limiting (1.4–3.2 A peak), thermal shutdown, and a dedicated ON/OFF pin (Pin 5) with 1.4 V typical logic threshold. Standby quiescent current is 80 µA typical, supporting low-power shutdown modes without external circuitry.
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 - accommodates wide-input industrial, automotive, and battery-derived supplies |
| Output Voltage Range | 1.23 V to 37 V ±4% - programmable via two external resistors; enables single BOM for multiple output rails |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 330 µH) |
| Feedback Reference | 1.23 V ±2% (0°C to 125°C) - sets output accuracy baseline; defines R1/R2 ratio for target VOUT |
| Quiescent Current | 5.0–9.0 mA (active), 80 µA (standby) - minimizes no-load power loss; enables efficient light-load operation |
| Thermal Protection | Internal thermal shutdown - prevents damage during sustained overload or poor heatsinking |
Pinout & Package
D2PAK (TO-263-5) package with exposed heat slug (terminal 6) electrically connected to Pin 3 (GND); requires PCB copper area for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local 100 µF low-ESR input capacitor |
| 2: Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.3 V at 1 A ensures low conduction loss |
| 3: GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and heatsink slug |
| 4: Feedback | Error amplifier input | Direct connection to internal 1.23 V reference; sets output via R1/R2 divider (VOUT = 1.23 × (1 + R2/R1)) |
| 5: ON/OFF | Logic-controlled enable | TTL-compatible; <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA when asserted high |
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 |
| Integrated 1.0 A switch | On-chip NPN transistor with 1.0 A guaranteed output - reduces bill-of-materials and layout complexity |
| Fixed 52 kHz oscillator | Enables predictable EMI filtering and compatibility with standard inductor families (e.g., Renco RL195x) |
| TTL shutdown capability | 80 µA standby current with logic-level ON/OFF control - supports microcontroller-based power sequencing |
| Full fault protection | Cycle-by-cycle current limit + thermal shutdown - ensures robust operation under short-circuit or overtemperature |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24 V vehicle battery to 5 V/1 A for microcontroller and sensor rails. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, efficient DC-DC conversion with thermal resilience. Use Value: Eliminates need for linear pre-regulator; achieves 77% efficiency at 12 VIN/5 VOUT, reducing heat sink size and system power loss. |
Use Scenario: Generating 3.3 V for CAN transceiver and EEPROM in door module electronics. IC Role / Device Role / Timing Role: Adjustable buck controller configured for 3.3 V output with tight tolerance and load regulation. Use Value: ±4% output accuracy over −40°C to +125°C ensures reliable logic-level compliance across automotive temperature extremes. |
| Programmable Lab Power Supply | Legacy Equipment Retrofit |
Use Scenario: User-adjustable 1.23–15 V output stage in benchtop DC supply with digital potentiometer interface. IC Role / Device Role / Timing Role: Core adjustable regulator with external R1/R2 network; ON/OFF pin enables remote enable/disable. Use Value: Single IC supports full 1.23–37 V range; 52 kHz frequency simplifies filter design versus variable-frequency alternatives. |
Use Scenario: Replacing obsolete linear regulators (e.g., 7805) in aging industrial controllers requiring higher efficiency. IC Role / Device Role / Timing Role: Drop-in buck replacement delivering same output voltage with lower thermal stress and input headroom. Use Value: Operates down to 4.75 V input - maintains regulation where linear regulators drop out; reduces board-level heating by >50%. |
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-220-5 package; higher RJA (65°C/W vs. 70°C/W); identical electrical specs | Requires larger heatsink for same 1 A load at high ambient; less suitable for space-constrained PCBs | Choose LM2575T-ADJ only if TO-220 mounting is preferred and thermal margin allows |
| MP1584EN-LF-Z | 3 A output, 1.5 MHz switching, smaller solution size; requires different compensation and external MOSFET driver | Not pin-compatible; needs redesign of inductor, diode, and feedback network; better for high-density designs | Choose MP1584EN-LF-Z when higher current or smaller footprint is critical and redesign is acceptable |
Compared with LM2575T-ADJ, LM2575D2T-ADJR4 offers superior thermal performance in surface-mount form factor; compared with MP1584EN-LF-Z, it provides proven reliability and simpler design with fewer external components, albeit at lower frequency and current rating.
Availability
LM2575D2T-ADJR4 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, programmable lab equipment, and legacy equipment retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2575D2T-ADJR4 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 sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a monolithic, easy-to-use buck regulator family minimizing external components while delivering 1.0 A output with robust thermal and current protection-targeting cost-sensitive, high-reliability embedded power applications.
FAQ
What is the maximum output voltage achievable with LM2575D2T-ADJR4?
The LM2575D2T-ADJR4 supports an adjustable output voltage range of 1.23 V to 37 V, with ±4% tolerance over line, load, and temperature (−40°C to +125°C). This is achieved using an external resistor divider on the Feedback pin, where VOUT = 1.23 V × (1 + R2/R1). The upper limit is constrained by the 40 V maximum input voltage and internal switch breakdown rating.
Does LM2575D2T-ADJR4 require a heatsink in 1 A operation?
LM2575D2T-ADJR4 can operate at 1 A without an external heatsink under moderate ambient conditions (e.g., <50°C) and adequate PCB copper area (≥2 in² of 2-oz copper tied to Pin 3/GND and the exposed heat slug). At higher ambient temperatures or continuous full-load operation, a small heatsink improves thermal margin-its RJA is 70°C/W (junction-to-ambient) per datasheet Figure 34.
Can LM2575D2T-ADJR4 be used in automotive applications?
Yes-LM2575D2T-ADJR4 is functionally identical to the AEC-Q100 qualified NCV2575 variant and shares the same operating junction temperature range (−40°C to +125°C), thermal shutdown, and moisture sensitivity level (MSL 1). While the LM2575D2T-ADJR4 part number itself is not AEC-Q100 certified, its design and process are aligned with automotive requirements; consult onsemi for PPAP-capable NCV2575D2T-ADJR4 if formal qualification is mandatory.
What is the minimum number of external components needed for LM2575D2T-ADJR4?
LM2575D2T-ADJR4 requires only four external components for basic operation: an input capacitor (100 µF), output capacitor (330 µF), catch diode (e.g., 1N5819), and inductor (e.g., 330 µH). The feedback resistors (R1/R2) are required for adjustable output but are counted separately-the core power stage functions with those four.
How does the ON/OFF pin of LM2575D2T-ADJR4 behave during shutdown?
When the ON/OFF pin (Pin 5) is pulled above 2.2 V (typical), LM2575D2T-ADJR4 enters low-power shutdown mode with total input supply current reduced to 80 µA typical. The internal switch turns off, output voltage collapses, and the feedback amplifier remains biased. Pulling Pin 5 below 1.4 V (typical) resumes normal regulation-no external pull-down is required due to internal biasing.
LM2575D2T-ADJR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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-ADJR4 FAQ
1.How can I place an order for LM2575D2T-ADJR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-ADJR4 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-ADJR4 reliable?
The price and inventory of LM2575D2T-ADJR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-ADJR4 is usually 5 days.
3.What payment methods are accepted for LM2575D2T-ADJR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-ADJR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-ADJR4?
LM2575D2T-ADJR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-ADJR4 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-ADJR4?
For technical support, including LM2575D2T-ADJR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-ADJR4 requirements.
6.How does Aetrix verify that LM2575D2T-ADJR4 is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-ADJR4 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-ADJR4 meets industry standards.
7.What is the process for return or replacement of LM2575D2T-ADJR4?
All LM2575D2T-ADJR4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-ADJR4, 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-ADJR4 part is unused and in its original packaging.
Return procedure for LM2575D2T-ADJR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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