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onsemi LM2575D2T-ADJR4G
- Part No.:
- LM2575D2T-ADJR4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-ADJR4G.pdf
- Description:
- IC REG BUCK ADJ 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,425
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Product details
Overview
LM2575D2T-ADJR4G from onsemi is a monolithic step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), 1.0 A guaranteed output current, 52 kHz fixed-frequency internal oscillator, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates across 4.75 V to 40 V input and delivers high efficiency-up to 77% at 12 VIN/5 VOUT/1 A-for compact DC-DC power conversion in industrial control modules.
For engineers reviewing the LM2575D2T-ADJR4G datasheet, pinout, applications, or equivalent options, key selection criteria include its D2PAK (TO-263) package with heatsink-connected ground pin, ±4% output voltage tolerance over line/load/temperature, TTL-compatible ON/OFF control, and minimal external component count (only 4 required).
Technical Context
The LM2575D2T-ADJR4G implements a voltage-mode controlled buck converter architecture with a 1.23 V internal bandgap reference, error amplifier, 52 kHz oscillator, and 1.0 A NPN switch. Its feedback pin directly senses the output divider network, enabling precise regulation across the full 1.23–37 V range without internal resistor programming.
Protection features include cycle-by-cycle current limiting (1.4–3.2 A peak), thermal shutdown (TJ ≥ 150°C), and low-quiescent standby mode (80 µA typical). The device supports stable operation with standard off-the-shelf inductors and requires no heatsink under typical 1 A loads due to low saturation voltage (1.0–1.3 V) and high efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0 A guaranteed continuous - supports single-rail microcontroller or sensor subsystems without derating. |
| Input Voltage Range | 4.75 V to 40 V - compatible with 5 V, 12 V, 24 V, and 36 V industrial bus rails. |
| Output Voltage Range | 1.23 V to 37 V adjustable - set via external R1/R2 divider; enables flexible rail generation from one BOM item. |
| Oscillator Frequency | 52 kHz ±10% (±2% over 0°C–125°C) - fixed frequency simplifies EMI filtering and inductor selection. |
| Feedback Reference Voltage | 1.23 V ±2.7% (−40°C to +125°C) - defines output accuracy baseline for all programmed voltages. |
| Standby Quiescent Current | 80 µA typical at 25°C - enables low-power shutdown in battery-backed or energy-sensitive systems. |
| Saturation Voltage | 1.0–1.3 V at 1.0 A - determines conduction loss and minimum dropout; dictates thermal design margin. |
Pinout & Package
D2PAK (TO-263-5) package with exposed heatsink pad electrically connected to Pin 3 (GND); thermally optimized for surface-mount PCBs requiring moderate power dissipation without external heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local 100 µF low-ESR bypass capacitor to suppress switching transients. |
| 2: Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.3 V at 1 A defines conduction loss; PCB copper area must be minimized to reduce EMI coupling. |
| 3: GND | Circuit ground / heatsink connection | Common return for all signals and power paths; exposed pad must be soldered to large PCB ground plane for thermal and electrical integrity. |
| 4: Feedback | Error amplifier input | Senses divided output voltage; high-impedance node (≤200 nA bias current) requiring short trace routing near R1/R2 resistors. |
| 5: ON/OFF | TTL-compatible enable/disable control | Logic-low (≤1.0 V) enables regulation; logic-high (≥2.2 V) disables switch and reduces IQ to 80 µA - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.23 V to 37 V via two external resistors - eliminates need for multiple fixed-voltage SKUs in multi-rail designs. |
| Integrated protection | Cycle-by-cycle current limit + thermal shutdown - prevents damage during overload, short-circuit, or ambient overheating without external circuitry. |
| Low-component-count design | Only 4 external parts required (inductor, diode, input/output capacitors) - reduces BOM cost, board space, and qualification effort. |
| High efficiency | 77% typical at 12 VIN/5 VOUT/1 A - lowers thermal load vs. linear regulators, enabling smaller enclosures and passive cooling. |
| TTL shutdown capability | 80 µA standby current with logic-level control - enables deep-sleep modes in portable or always-on IoT edge devices. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated 3.3 V or 5 V logic rails from a 12 V or 24 V vehicle battery or factory bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated DC to MCU, CAN transceiver, and digital I/O drivers. Use Value: ±4% output tolerance ensures reliable logic-level compliance; 40 V max input withstands load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: Generating 5 V for microcontroller and sensors in door module or lighting control unit. IC Role / Device Role / Timing Role: Main DC-DC converter with ON/OFF pin tied to vehicle ignition signal for automatic power-up/down sequencing. Use Value: 80 µA standby current meets automotive quiescent current requirements; AEC-Q100 qualified NCV variants available for full qualification path. |
| Point-of-Load Telecom Supply | Programmable Test Equipment PSU |
|
Use Scenario: Local 12 V or 15 V rail generation from a 48 V backplane in base station submodules. IC Role / Device Role / Timing Role: Secondary buck stage stepping down intermediate bus voltage to ASIC or FPGA core voltage domains. Use Value: 52 kHz fixed frequency allows predictable EMI filter design; D2PAK package supports >1 W dissipation without heatsink at 50°C ambient. |
Use Scenario: User-configurable output voltage (e.g., 3.3 V, 5 V, 9 V, 12 V) in bench power supplies or automated test fixtures. IC Role / Device Role / Timing Role: Adjustable-output regulator whose VOUT is set by DAC-controlled resistor network or front-panel potentiometer. Use Value: 1.23 V reference enables precise programmability; ±4% total output error includes temp/line/load effects - simplifies calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVS-ADJ/NOPB | TO-220-5 package; higher 60 V max input; identical electrical specs except RJA = 65°C/W vs. 70°C/W. | Better suited for high-input-voltage industrial systems (>40 V) where through-hole mounting is preferred. | Select when input exceeds 40 V or mechanical robustness of TO-220 is required; same feedback network and layout. |
| MP1584EN-LF-Z | 3 A output; 1.5 MHz switching; smaller solution size; requires different compensation and external MOSFET driver. | Targets space-constrained, high-efficiency designs needing >1 A or faster transient response. | Choose for higher current or higher frequency; not drop-in - requires new inductor, diode, and loop compensation redesign. |
Compared with LM2575HVS-ADJ/NOPB, the LM2575D2T-ADJR4G offers lower thermal resistance to PCB but lacks 60 V input rating; versus MP1584EN-LF-Z, it trades higher current and frequency for proven reliability, simpler design, and legacy compatibility in cost-sensitive industrial applications.
Availability
LM2575D2T-ADJR4G is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, telecom point-of-load supplies, and programmable test equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2575D2T-ADJR4G 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 power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The LM2575 series was designed as a rugged, easy-to-use buck regulator family targeting cost-sensitive, high-reliability applications where simplicity, thermal resilience, and wide input range outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2575D2T-ADJR4G?
The LM2575D2T-ADJR4G has an absolute maximum input voltage of 45 V, with recommended operating input up to 40 V. Exceeding 40 V may trigger internal protection or reduce lifetime; for 48 V systems, consider the LM2575HVS-ADJ variant rated to 60 V. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
Does LM2575D2T-ADJR4G require an external catch diode?
Yes, the LM2575D2T-ADJR4G requires an external Schottky catch diode (e.g., 1N5819 or MBR320) connected between the Output (Pin 2) and GND (Pin 3). The diode provides the freewheeling path during switch-off; omitting it will cause catastrophic failure due to inductive kickback and voltage overshoot at the output pin.
How is output voltage set on LM2575D2T-ADJR4G?
Output voltage is set using two external resistors (R1 and R2) forming a voltage divider from VOUT to GND, with the junction connected to the Feedback (Pin 4). The formula is VOUT = 1.23 V × (1 + R2/R1), where R1 is typically 1.0–5.0 kΩ. For example, R1 = 1.2 kΩ and R2 = 3.9 kΩ yields ~5.2 V output.
What thermal considerations apply to LM2575D2T-ADJR4G in D2PAK package?
The LM2575D2T-ADJR4G in D2PAK has RJA = 70°C/W (JEDEC High-K board). To maintain TJ ≤ 125°C at 1 A load, ensure the exposed GND pad is fully soldered to ≥2 in² of 2-oz copper with ≥6 thermal vias. At 40 VIN/5 VOUT, power dissipation exceeds 3.5 W - forced air or heatsink may be needed above 50°C ambient.
Is LM2575D2T-ADJR4G pin-compatible with other LM2575 variants?
Yes, all LM2575 variants (fixed and adjustable, D2PAK, TO-220, surface-mount) share identical 5-pin functional mapping: Pin 1 = Vin, Pin 2 = Output, Pin 3 = GND, Pin 4 = Feedback, Pin 5 = ON/OFF. However, thermal performance and max input voltage differ by package and suffix - verify datasheet tables before substitution.
LM2575D2T-ADJR4G 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:
- Active
- 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-ADJR4G FAQ
1.How can I place an order for LM2575D2T-ADJR4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-ADJR4G 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-ADJR4G reliable?
The price and inventory of LM2575D2T-ADJR4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-ADJR4G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-ADJR4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-ADJR4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-ADJR4G?
LM2575D2T-ADJR4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-ADJR4G 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-ADJR4G?
For technical support, including LM2575D2T-ADJR4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-ADJR4G requirements.
6.How does Aetrix verify that LM2575D2T-ADJR4G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-ADJR4G 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-ADJR4G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-ADJR4G?
All LM2575D2T-ADJR4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-ADJR4G, 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-ADJR4G part is unused and in its original packaging.
Return procedure for LM2575D2T-ADJR4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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