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onsemi LM2575D2T-12R4G
- Part No.:
- LM2575D2T-12R4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-12R4G.pdf
- Description:
- IC REG BUCK 12V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LM2575D2T-12R4G from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 12 V output, 52 kHz internal oscillator frequency, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 15 V to 40 V input and is used in efficient pre-regulators for linear regulators and on-card DC-DC conversion.
For engineers reviewing the LM2575D2T-12R4G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A load capability, fixed 12 V output without external feedback resistors, TO-263 (D2PAK) package thermal performance, and compatibility with standard off-the-shelf 330 µH inductors and Schottky catch diodes.
Technical Context
The LM2575D2T-12R4G implements a voltage-mode controlled buck converter with a fixed-frequency 52 kHz oscillator, internal 1.23 V bandgap reference, and error amplifier driving a 1.0 A NPN switch. Its control loop uses output voltage sensing via internal resistor divider (for fixed-output versions) and features built-in 18 kHz foldback during overload to reduce junction temperature.
It integrates cycle-by-cycle current limiting (typ. 2.3 A peak), thermal shutdown (150 °C), and TTL-compatible ON/OFF pin with 80 µA standby current. The device requires only four external components: input capacitor, output capacitor, catch diode, and inductor - all optimized for standard values across the LM2575 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over −40°C to +125°C, 0.2–1.0 A load, and 15–40 V input - eliminates need for external feedback resistors. |
| Output Current | Guaranteed 1.0 A continuous - supports medium-power embedded systems without heatsink under typical conditions. |
| Input Voltage Range | 15 V to 40 V DC - suitable for industrial 24 V rail and automotive battery-supplied applications with transient margin. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current inductors with minimal EMI filtering. |
| Efficiency | 88% at Vin = 15 V, IOUT = 1.0 A - significantly higher than linear regulators, reducing power loss and thermal design burden. |
| Standby Current | 80 µA typical when ON/OFF pin ≥ 2.4 V - enables low-power shutdown mode for battery-backed or energy-sensitive systems. |
| Thermal Resistance | Junction-to-case 5.0 °C/W - allows direct heatsink mounting via exposed tab (Pin 3) for high ambient or sustained load operation. |
Pinout & Package
LM2575D2T-12R4G uses the D2PAK (TO-263) package (Case 936A), with Pin 3 connected to the exposed metal tab serving as both ground and thermal path. The heatsink surface is electrically tied to Pin 3 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 15–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF/50 V) placed adjacent to minimize switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 12 V; saturation voltage ≤1.2 V at 1.0 A - dictates minimum dropout and conduction loss in buck topology. |
| 3 - GND | Circuit and thermal ground | Common return for input/output paths and thermal interface; PCB copper area must be large for heat dissipation and low-impedance grounding. |
| 4 - Feedback | Internal voltage divider tap | Internally connected to fixed 12 V divider - not accessible externally; unused in fixed-output variants. |
| 5 - ON/OFF | Logic-controlled enable input | TTL-compatible: <1.0 V = "on", >2.4 V = "off"; draws ≤30 µA in active state - enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors, reduces BOM count, and ensures stable regulation without trimming or calibration. |
| Integrated protection | Combines cycle-by-cycle current limiting (2.3 A typ.), thermal shutdown (150 °C), and 18 kHz foldback during short-circuit - prevents damage without external circuitry. |
| Low-component-count design | Requires only 4 external parts: input cap, output cap, Schottky diode (e.g., 1N5819), and 330 µH inductor - accelerates layout and validation. |
| High efficiency at 12 V out | 88% efficiency at 15 VIN/1.0 A enables compact thermal design and extends battery life in portable 12 V systems. |
| D2PAK thermal performance | 5.0 °C/W junction-to-case resistance with heatsink-mountable tab - supports 1.0 A continuous operation up to +85°C ambient without forced air. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V vehicle battery or industrial rail to stable 12 V for microcontrollers, sensors, and actuators. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, noise-immune 12 V rail with fast transient response. Use Value: Delivers full 1.0 A at 88% efficiency, minimizing heat buildup in sealed enclosures and extending component lifetime. |
Use Scenario: Powering CAN transceivers, LIN interfaces, and door/window control logic in automotive ECUs. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying clean 12 V to communication peripherals with built-in fault protection. Use Value: Withstands load dump transients up to 40 V input and shuts down safely during short circuits - meets AEC-Q100 stress requirements. |
| Programmable Logic Controller (PLC) I/O Module | Test Equipment Power Subsystem |
|
Use Scenario: Generating local 12 V bias for analog input conditioning, relay drivers, and isolation circuitry in modular PLC backplanes. IC Role / Device Role / Timing Role: High-reliability DC-DC stage ensuring stable voltage despite varying input due to long cable runs or shared rails. Use Value: ±4% output tolerance over −40°C to +125°C guarantees consistent ADC reference and actuator timing across operating range. |
Use Scenario: Providing regulated 12 V to FPGA configuration circuitry, DACs, and precision op-amps in benchtop test instruments. IC Role / Device Role / Timing Role: Low-noise, well-regulated power source with fast enable/disable for power sequencing and sleep modes. Use Value: 80 µA standby current and TTL ON/OFF control allow precise power gating - critical for low-power calibration sequences. |
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-12G | TO-220 package (Case 314D); RJA = 65 °C/W vs. 70 °C/W for D2PAK; same electrical specs. | Limited to lower ambient temperatures or forced-air cooling; less suitable for high-density PCBs requiring surface-mount assembly. | Select when through-hole mounting, manual prototyping, or legacy board compatibility is required. |
| MP1584EN-LF-Z | 4.5–28 V input; adjustable output; 3 MHz switching; smaller solution size but no integrated thermal protection foldback. | Better for space-constrained designs needing variable output, but requires external current limit and thermal monitoring. | Choose for compact, high-frequency designs where 12 V is programmable and thermal safety is managed at system level. |
Compared with LM2575T-12G, the LM2575D2T-12R4G offers superior thermal dissipation in surface-mount form factor; compared with MP1584EN-LF-Z, it trades higher frequency for robust integrated protection and fixed-output simplicity in industrial environments.
Availability
LM2575D2T-12R4G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575D2T-12R4G 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a rugged, low-component-count buck regulator family targeting cost-sensitive, reliability-critical applications such as industrial controls and automotive subsystems - prioritizing ease of use, thermal resilience, and fault tolerance over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for the LM2575D2T-12R4G?
The LM2575D2T-12R4G has an absolute maximum input voltage of 45 V, but its recommended operating input range is 15 V to 40 V DC for the 12 V fixed-output version. Operation above 40 V risks exceeding safe power dissipation limits even with heatsinking, and below 15 V may cause dropout or regulation failure. Always observe derating curves in the datasheet for extended temperature operation.
Does the LM2575D2T-12R4G require external feedback resistors to set the output voltage?
No - the LM2575D2T-12R4G is a fixed 12 V output variant with internal resistor divider network. Pin 4 (Feedback) is internally connected and not user-accessible; no external resistors are needed. This simplifies design, improves stability, and eliminates drift-related errors common in adjustable configurations.
Can the LM2575D2T-12R4G be used in automotive applications?
Yes - the LM2575D2T-12R4G meets AEC-Q100 stress testing requirements when ordered as the NCV2575 variant, but the LM2575D2T-12R4G itself is qualified for industrial temperature range (−40°C to +125°C) and supports automotive input transients (up to 40 V). For full PPAP compliance, specify NCV2575D2T-12R4G.
What inductor value is recommended for the LM2575D2T-12R4G?
The standard inductor value for LM2575D2T-12R4G is 330 µH, optimized for 1.0 A load and 52 kHz switching. Per Figure 19 of the datasheet, this value corresponds to the L330 region for 15–40 V input and ≤1.0 A output. Inductors must handle ≥2.3 A peak current and be rated for ≥52 kHz operation (e.g., Pulse PE-52627 or Renco RL1952).
How does the ON/OFF pin function on the LM2575D2T-12R4G?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: applying <1.0 V (or grounding) enables regulation; applying >2.4 V disables the internal switch, reducing total input current to ~80 µA. The pin draws ≤30 µA when high, enabling direct interfacing with microcontroller GPIOs without level-shifting.
LM2575D2T-12R4G 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- 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-12R4G FAQ
1.How can I place an order for LM2575D2T-12R4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-12R4G 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-12R4G reliable?
The price and inventory of LM2575D2T-12R4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-12R4G is usually 5 days.
3.What payment methods are accepted for LM2575D2T-12R4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-12R4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-12R4G?
LM2575D2T-12R4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-12R4G 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-12R4G?
For technical support, including LM2575D2T-12R4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-12R4G requirements.
6.How does Aetrix verify that LM2575D2T-12R4G is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-12R4G 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-12R4G meets industry standards.
7.What is the process for return or replacement of LM2575D2T-12R4G?
All LM2575D2T-12R4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-12R4G, 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-12R4G part is unused and in its original packaging.
Return procedure for LM2575D2T-12R4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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