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onsemi LM2576D2T-3.3
- Part No.:
- LM2576D2T-3.3
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,976
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Product details
Overview
LM2576D2T-3.3 from onsemi is a monolithic 3.0 A, 52 kHz fixed-frequency step-down (buck) switching regulator with fixed 3.3 V output, designed for high-efficiency DC-DC conversion in industrial and embedded power supplies. It operates from 7.0 V to 40 V input, delivers ±4% output voltage tolerance over line/load/temperature, and integrates thermal shutdown and cycle-by-cycle current limiting.
For engineers reviewing the LM2576D2T-3.3 datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (7–40 V), guaranteed 3.0 A output current, D2PAK (TO-263) package thermal performance, and compatibility with standard off-the-shelf inductors such as Pulse PE-92108.
Technical Context
The LM2576D2T-3.3 implements a voltage-mode controlled buck topology with an internal 52 kHz oscillator, integrated 3.0 A NPN switch, and 1.235 V bandgap reference. Its feedback loop uses a precision error amplifier comparing output voltage (via internal resistor divider for fixed versions) against this reference.
Protection features include cycle-by-cycle current limiting (typ. 5.8 A peak at 25 °C), thermal shutdown at 150 °C junction temperature, and TTL-compatible ON/OFF control with 80 µA standby current. The device requires only four external components: input capacitor, output capacitor, catch diode (e.g., MBR360), and inductor (e.g., 100 µH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 6–40 V input - ensures stable logic supply for microcontrollers and FPGAs. |
| Max Output Current | 3.0 A continuous - supports mid-power applications like sensor hubs and industrial I/O modules without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial rails (e.g., 12/24 V nominal systems with surge tolerance). |
| Switching Frequency | 52 kHz (±10% over temp) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 75% typ. at 12 VIN, 3.0 A - significantly exceeds linear regulators under same conditions, minimizing heatsink requirements. |
| Quiescent Current | 5.0 mA typ. (active), 80 µA typ. (standby) - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Resistance | RθJC = 5.0 °C/W - allows direct heatsinking via D2PAK exposed pad to maintain safe junction temperature at full load. |
Pinout & Package
D2PAK (TO-263-5) package with exposed thermal pad connected to Pin 3 (GND); heatsink surface must be soldered to PCB copper for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires low-ESR 100 µF input capacitor placed adjacent to minimize switching transients. |
| 2: Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.8 V at 3.0 A - contributes directly to conduction loss and thermal design. |
| 3: GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and thermal pad; must be single-point grounded per layout guidelines. |
| 4: Feedback | Regulated output sense node | Internally connected to fixed 3.3 V divider; not user-accessible in fixed-output variants - eliminates external resistor selection errors. |
| 5: ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator, reducing input current to ~80 µA; open or logic-low enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0 A switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and layout area in space-constrained designs. |
| Fixed 3.3 V output | Guaranteed ±4% accuracy across temperature and load - suitable for powering 3.3 V microcontrollers, ADCs, and communication ICs without post-regulation. |
| 52 kHz oscillator | Enables use of low-cost, high-current pulse inductors (e.g., 100 µH) with minimal core loss - simplifies magnetics selection and lowers system cost. |
| TTL shutdown | Reduces total input current to 80 µA typical during standby - critical for low-quiescent-power battery-operated or always-on systems. |
| Thermal + current protection | Auto-recovery thermal shutdown and cycle-by-cycle current limit prevent damage during overload or short-circuit events - improves field reliability. |
Applications
| Industrial PLC I/O Module | Embedded Microcontroller Power Supply |
|---|---|
Use Scenario: Providing regulated 3.3 V rail to digital I/O circuits, analog front-ends, and isolation interfaces in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V input to clean 3.3 V for MCU, FPGA, and sensor signal conditioning. Use Value: High efficiency (≥75%) minimizes heat buildup in sealed enclosures; 3.0 A output supports multiple peripherals without derating. | Use Scenario: Powering ARM Cortex-M or RISC-V microcontrollers in edge-node IoT devices with wide-input 12 V battery or adapter input. IC Role / Device Role / Timing Role: Main DC-DC converter delivering stable 3.3 V to processor core, memory, and wireless transceivers. Use Value: Fixed 3.3 V output eliminates external feedback resistors, reducing component count and improving long-term voltage stability. |
| On-Card Switching Regulator | Efficient Pre-Regulator for Linear Regulators |
Use Scenario: Local point-of-load regulation on dense PCBs where space limits use of larger buck modules or discrete controllers. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator mounted directly beside load ICs to reduce voltage drop and noise coupling. Use Value: D2PAK package offers superior thermal performance vs. SO-8 alternatives, enabling 3.0 A output in minimal board area. | Use Scenario: Reducing dropout voltage before low-noise LDOs in mixed-signal systems (e.g., audio codecs, precision ADCs) requiring ultra-low ripple. IC Role / Device Role / Timing Role: First-stage buck converter stepping 12 V down to 5 V or 3.3 V, feeding low-dropout linear regulator for final clean rail. Use Value: 75%+ efficiency at full load cuts pre-regulator dissipation by >70% vs. linear solution - extends thermal margin and simplifies heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-3.3 | TO-220-5 package; higher RθJA (65 °C/W vs. 70 °C/W for D2PAK); identical electrical specs. | Less effective thermal dissipation in high-density layouts; requires external heatsink for sustained 3.0 A operation. | Select when mechanical mounting constraints favor TO-220 or legacy board compatibility is required. |
| MP1584EN-LF-Z | 3.0 A, 1.5 MHz synchronous buck; smaller external components; no external diode needed. | Higher frequency enables smaller inductors/capacitors but increases EMI sensitivity; lacks built-in thermal shutdown latch. | Select for size-constrained designs where board area is premium and EMI filtering can be implemented. |
Compared with LM2576T-3.3, the LM2576D2T-3.3 offers better thermal resistance in surface-mount applications; compared with MP1584EN-LF-Z, it provides proven robustness in industrial environments with integrated protection and lower EMI generation at 52 kHz.
Availability
LM2576D2T-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller power supplies, on-card switching regulators, and efficient pre-regulator applications requiring stable component supply and long-term manufacturability.
Supply support for LM2576D2T-3.3 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed specifically for simple, reliable, high-efficiency step-down conversion in cost-sensitive industrial and embedded systems - prioritizing minimal external components, robust protection, and wide-input operation.
FAQ
What is the maximum input voltage rating for the LM2576D2T-3.3?
The LM2576D2T-3.3 has a maximum supply voltage rating of 45 V, with recommended operating input range of 7.0 V to 40 V. Exceeding 45 V may cause permanent damage. The device's internal current limit and thermal shutdown provide protection within this absolute maximum rating, but design should target ≤40 V for reliable long-term operation per datasheet specifications.
Does the LM2576D2T-3.3 require an external catch diode?
Yes, the LM2576D2T-3.3 requires an external Schottky catch diode (e.g., MBR360) connected between the Output pin and GND. Unlike synchronous buck converters, it uses an internal NPN transistor switch and relies on this external diode to complete the inductor current path during the switch-off period. Omitting it will cause failure.
Can the LM2576D2T-3.3 be used in adjustable-output configurations?
No - the LM2576D2T-3.3 is a fixed-output variant with internal feedback divider set for 3.3 V. To achieve adjustable output, the LM2576ADJ-D2T must be used instead, which exposes the Feedback pin for external resistor programming. Attempting to modify the LM2576D2T-3.3 for adjustability is not supported and will not function correctly.
What is the thermal performance of the LM2576D2T-3.3 in its D2PAK package?
The LM2576D2T-3.3 in D2PAK (Case 936A) has RθJC = 5.0 °C/W and RθJA = 70 °C/W. With proper PCB copper pour under the exposed thermal pad, it sustains 3.0 A output at ambient temperatures up to 75 °C without additional heatsinking. For higher ambient or continuous full-load operation, thermal vias and inner-layer copper planes are recommended.
Is the LM2576D2T-3.3 RoHS compliant and lead-free?
Yes, the LM2576D2T-3.3 is offered in Pb-Free packages meeting RoHS Directive 2011/65/EU requirements. The device carries Moisture Sensitivity Level (MSL) 1, indicating unlimited floor life at ≤30 °C/85% RH - no baking required prior to reflow assembly.
LM2576D2T-3.3 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 or Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2576D2T-3.3 FAQ
1.How can I place an order for LM2576D2T-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-3.3 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 LM2576D2T-3.3 reliable?
The price and inventory of LM2576D2T-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-3.3 is usually 5 days.
3.What payment methods are accepted for LM2576D2T-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-3.3?
LM2576D2T-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-3.3 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 LM2576D2T-3.3?
For technical support, including LM2576D2T-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-3.3 requirements.
6.How does Aetrix verify that LM2576D2T-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-3.3 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 LM2576D2T-3.3 meets industry standards.
7.What is the process for return or replacement of LM2576D2T-3.3?
All LM2576D2T-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-3.3, 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 LM2576D2T-3.3 part is unused and in its original packaging.
Return procedure for LM2576D2T-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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