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onsemi LM2575D2T-5R4
- Part No.:
- LM2575D2T-5R4
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-5R4.pdf
- Description:
- IC REG BUCK 5V 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,471
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Product details
Overview
LM2575D2T-5R4 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current with fixed 5.0 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 8.0 V to 40 V input and is used in on-card DC-DC conversion for industrial power supplies.
For engineers reviewing the LM2575D2T-5R4 datasheet, pinout, applications, or equivalent options, key selection considerations include input voltage range, guaranteed 1.0 A load capability, D2PAK (TO-263) package thermal performance, and compatibility with standard 330 µH inductors and Schottky catch diodes.
Technical Context
The LM2575D2T-5R4 implements a voltage-mode controlled buck converter with an internal 1.0 A NPN switch, 1.23 V bandgap reference, and error amplifier driving a PWM comparator. Its 52 kHz fixed-frequency oscillator enables predictable EMI filtering and simplifies external component selection.
It features TTL-compatible ON/OFF control (1.4 V threshold), 80 µA standby quiescent current, and protection circuitry including thermal shutdown and peak-current limiting (1.7–3.0 A typical). The feedback pin is internally connected to the 5.0 V output divider, eliminating external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over −40°C to +125°C, 0.2–1.0 A load, and 8–40 V input - ensures stable logic supply without trimming. |
| Max Output Current | 1.0 A continuous - supports single-rail microcontroller or FPGA core power with margin. |
| Input Voltage Range | 8.0 V to 40 V - accommodates 12 V/24 V industrial bus inputs and battery-derived rails. |
| Oscillator Frequency | 52 kHz (±10% over temp) - enables use of low-cost, high-saturation-current inductors and reduces EMI below 150 kHz. |
| Efficiency | 77% at 12 VIN, 1.0 A, 5 VOUT - minimizes heat generation vs. linear regulators, often eliminating heatsink need. |
| Quiescent Current | 5.0 mA typical (11 mA max) - enables low-power operation in active mode without excessive idle loss. |
| Standby Current | 80 µA typical at ON/OFF = 5 V - supports ultra-low-power shutdown for battery-backed systems. |
Pinout & Package
D2PAK (TO-263-5) package with exposed thermal pad (terminal 6) electrically connected to Pin 3 (GND); requires minimum copper area for thermal dissipation per JEDEC MO-263.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 8–40 V unregulated DC; requires low-ESR 100 µF input capacitor placed adjacent to minimize switching noise. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤1.2 V at 1.0 A - impacts dropout and efficiency at low VIN–VOUT. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, feedback, and ON/OFF; must be single-point grounded near IC for stability. |
| 4 - Feedback | Regulated output sense node | Internally tied to 5.0 V divider; not accessible - eliminates resistor selection error and improves accuracy vs. adjustable versions. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible; <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA when high - enables microcontroller-based power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors, reducing BOM count, layout sensitivity, and temperature drift in production. |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or ambient overheating. |
| Low-component design | Requires only four external parts: input cap, output cap, inductor, and Schottky diode - accelerates prototyping and reduces failure points. |
| D2PAK thermal performance | RJC = 5.0°C/W enables 1.0 A operation at up to +125°C junction temperature with minimal PCB copper. |
| Automotive-grade option | NCV2575 variant available AEC-Q100 qualified; LM2575D2T-5R4 shares identical electrical specs and pinout. |
Applications
| Industrial PLC Power Supply | Embedded Controller Core Rail |
|---|---|
|
Use Scenario: Providing regulated 5 V for I/O modules and communication interfaces in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V bus to isolated 5 V logic rail with high efficiency and fault resilience. Use Value: 77% efficiency at full load reduces thermal stress in enclosed cabinets; thermal shutdown prevents field failures during ambient temperature excursions. |
Use Scenario: Powering ARM Cortex-M4 microcontrollers and peripheral logic in edge IoT gateways with wide-input 12–36 V battery or PoE sources. IC Role / Device Role / Timing Role: On-board buck converter delivering clean, stable 5 V to MCU VDD and USB PHY, synchronized to system clock domain. Use Value: Fixed 5.0 V output eliminates calibration overhead; 80 µA standby current extends battery life in sleep modes without external enable logic. |
| Test Equipment Auxiliary Rail | Motor Drive Logic Supply |
|
Use Scenario: Generating 5 V for analog front-end biasing, ADC references, and digital control logic in portable multimeters and signal generators. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main SMPS, minimizing noise coupling into precision analog sections. Use Value: Low 52 kHz switching frequency allows simple LC filtering; ±4% output tolerance meets 12-bit ADC reference stability requirements. |
Use Scenario: Supplying isolated 5 V to gate drivers, current sensors, and MCU in BLDC motor inverters powered from 48 V battery packs. IC Role / Device Role / Timing Role: Robust pre-regulator feeding linear LDOs for gate driver ICs, surviving automotive load-dump transients up to 40 V. Use Value: 40 V absolute max input rating and built-in current limiting protect against battery surge events; D2PAK package withstands vibration and thermal cycling. |
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-5.0 | TO-220-5 package (RJA = 65°C/W vs. 70°C/W), same electrical specs, no exposed thermal pad. | Lower power density; requires larger heatsink for 1.0 A at high ambient; suitable for non-space-constrained designs. | Select LM2575T-5.0 if mechanical mounting constraints favor through-hole or thermal management uses external heatsink. |
| MP1584EN-LF-Z | 4.5–28 V input, 1.5 A output, 1.4 MHz switching, adjustable output - higher frequency, smaller passives, but narrower VIN range. | Not drop-in; requires redesign of inductor/capacitor values and feedback network; better for compact, high-efficiency designs. | Select MP1584EN-LF-Z only when board space is critical and input voltage stays ≤28 V; LM2575D2T-5R4 remains preferred for 36–40 V industrial inputs. |
Compared with LM2575T-5.0, LM2575D2T-5R4 offers superior thermal resistance to case and surface-mount assembly; compared with MP1584EN-LF-Z, it supports wider input voltage and requires fewer external components but operates at lower frequency.
Availability
LM2575D2T-5R4 is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded controller core rails, test equipment auxiliary rails, and motor drive logic supplies requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LM2575D2T-5R4 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2575 series was designed as a cost-optimized, easy-to-use buck regulator family targeting industrial and embedded power conversion where reliability, simplicity, and wide input range outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage for LM2575D2T-5R4?
The LM2575D2T-5R4 has an absolute maximum input voltage rating of 45 V, with recommended operating input range of 8.0 V to 40 V. Exceeding 40 V may trigger internal protection or reduce reliability; sustained operation above 45 V risks permanent damage to the internal NPN switch and control circuitry of the LM2575D2T-5R4.
Does LM2575D2T-5R4 require external feedback resistors?
No. The LM2575D2T-5R4 is the fixed 5.0 V output version - its internal resistor divider is factory-trimmed and permanently connected to the feedback pin (Pin 4). No external resistors are needed, unlike the adjustable LM2575ADJ variant, which simplifies layout and improves output voltage accuracy over temperature for the LM2575D2T-5R4.
What inductor value is recommended for LM2575D2T-5R4?
A 330 µH inductor is the standard recommendation for LM2575D2T-5R4 at 1.0 A load and 12 V input, per Figure 18 and Table 1 of the datasheet. Inductors such as Pulse PE-52627 or Renco RL1952 are optimized for 52 kHz operation and rated for ≥1.15 A DC current to ensure stable continuous conduction mode for the LM2575D2T-5R4.
Can LM2575D2T-5R4 be used in automotive applications?
The LM2575D2T-5R4 is not AEC-Q100 qualified; however, the functionally identical NCV2575D2T-5R4 variant is automotive-qualified and PPAP-capable. For automotive use, specify NCV2575D2T-5R4 - it shares the same D2PAK package, pinout, and electrical characteristics as the LM2575D2T-5R4 but undergoes additional screening and traceability controls.
What is the thermal resistance of the LM2575D2T-5R4 package?
The LM2575D2T-5R4 uses the D2PAK (TO-263-5) package with junction-to-case thermal resistance (RJC) of 5.0°C/W and junction-to-ambient (RJA) of 70°C/W (Figure 34). Effective thermal performance depends on PCB copper area under the exposed pad; minimum 1 in² of 2-oz copper is recommended to maintain TJ ≤ 125°C at 1.0 A for the LM2575D2T-5R4.
LM2575D2T-5R4 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- 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-5R4 FAQ
1.How can I place an order for LM2575D2T-5R4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-5R4 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-5R4 reliable?
The price and inventory of LM2575D2T-5R4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-5R4 is usually 5 days.
3.What payment methods are accepted for LM2575D2T-5R4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-5R4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-5R4?
LM2575D2T-5R4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-5R4 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-5R4?
For technical support, including LM2575D2T-5R4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-5R4 requirements.
6.How does Aetrix verify that LM2575D2T-5R4 is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-5R4 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-5R4 meets industry standards.
7.What is the process for return or replacement of LM2575D2T-5R4?
All LM2575D2T-5R4 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-5R4, 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-5R4 part is unused and in its original packaging.
Return procedure for LM2575D2T-5R4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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