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Microchip Technology LM2576BT
- Part No.:
- LM2576BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
LM2576BT.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:75,604
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Product details
Overview
LM2576BT from Texas Instruments is a 3A step-down switching regulator IC with fixed 5V output, 40V input voltage rating, and 52kHz switching frequency. It integrates a PWM controller, power switch, and thermal shutdown protection, and is used in industrial power supplies and embedded system DC-DC conversion.
For engineers reviewing the LM2576BT datasheet, LM2576BT pinout, LM2576BT application, or LM2576BT equivalent, key selection criteria include output current capability (3A), dropout behavior under load transients, thermal performance in TO-220-5 package, and compatibility with standard buck converter external components (inductor, diode, capacitors).
Technical Context
The LM2576BT implements a fixed-frequency pulse-width modulation (PWM) control architecture with internal 52kHz oscillator and built-in 3A NPN power transistor. It operates over 4V to 40V input range and delivers regulated 5V ±2% output with line regulation of 0.1%/V and load regulation of 0.2%.
Thermal shutdown activates at 165°C junction temperature, and the device includes cycle-by-cycle current limiting and undervoltage lockout (UVLO) with 3.8V turn-on threshold. No external compensation network is required for stable operation with standard output filter configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% - eliminates need for external feedback resistors and simplifies BOM. |
| Max Output Current | 3A continuous - supports mid-power applications such as microcontroller power rails and sensor subsystems. |
| Input Voltage Range | 4V to 40V - enables direct use with 12V/24V industrial bus inputs without pre-regulation. |
| Switching Frequency | 52kHz ±10% - allows use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Line Regulation | 0.1%/V - ensures stable output across wide input variations typical in automotive or battery-fed systems. |
| Load Regulation | 0.2% - maintains tight voltage accuracy from no-load to full 3A load without external trimming. |
Pinout & Package
LM2576BT is housed in a TO-220-5 (straight lead) thermally enhanced package with exposed metal tab electrically connected to Pin 2 (Ground). The package provides 2.5°C/W junction-to-case thermal resistance when mounted on ≥2in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage supply | Accepts 4V–40V unregulated DC; requires local 100µF electrolytic capacitor for stability. |
| Pin 2 (GND) | Power ground / thermal pad | Common return path and primary heat dissipation node; must be soldered to large copper pour. |
| Pin 3 (OUT) | Regulated output | Delivers 5V at up to 3A; connects to output inductor and freewheeling diode anode. |
| Pin 4 (FEEDBACK) | Feedback disable | Internally tied to ground; leaving open or grounding disables feedback loop for fixed-output mode. |
| Pin 5 (ON/OFF) | Enable control | Logic-high (>2.5V) enables regulator; logic-low (<1.3V) disables output and reduces quiescent current to 50µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A NPN switch | Eliminates need for external power transistor and associated drive circuitry. |
| Fixed 5V output configuration | Reduces component count by removing feedback resistor network and associated layout sensitivity. |
| Internal 52kHz oscillator | Enables predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
| Thermal shutdown with hysteresis | Protects against sustained overload or poor heatsinking without latch-up; resumes operation after cooldown. |
| Undervoltage lockout (UVLO) | Prevents erratic startup during brown-out conditions by holding off until input exceeds 3.8V. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing clean 5V rail for microcontroller, I/O drivers, and CAN transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator delivering stable 5V from 24V DC bus. Use Value: Delivers 3A continuous current with <0.2% load regulation, ensuring reliable MCU operation during I/O switching transients. | Use Scenario: Powering 5V logic circuits in vehicle door modules, seat controllers, and lighting ECUs. IC Role / Device Role / Timing Role: Main 5V supply regulator tolerant of automotive load dump (40V) and cold-crank (4V) conditions. Use Value: Withstands 40V input surges and maintains regulation down to 4V, eliminating need for upstream TVS or pre-regulator stages. |
| Embedded System Power Subsystem | Test Equipment Auxiliary Supply |
Use Scenario: Generating 5V for FPGA configuration, memory, and peripheral interfaces in field-deployable edge devices. IC Role / Device Role / Timing Role: High-current, thermally robust DC-DC stage replacing linear regulators to reduce heat generation. Use Value: Achieves >75% efficiency at 2A load, reducing thermal load compared to 7805-based solutions while maintaining low-noise output. | Use Scenario: Providing isolated 5V bias for analog front-end circuitry and digital logic in benchtop instrumentation. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying low-noise, well-regulated 5V from lab DC supply or internal battery pack. Use Value: Internal UVLO and thermal shutdown ensure safe operation during test setup misconfigurations or extended overloads. |
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-5.0 | Same 5V fixed output, TO-220-5 package, but rated for 3A at lower ambient (25°C only); lacks extended thermal derating curve of LM2576BT. | Suitable for lower-power or better-ventilated designs where full 3A at 70°C ambient is not required. | Select LM2576BT when operating ambient exceeds 50°C or when consistent 3A delivery across temperature is critical. |
| LM2596T-5.0 | Higher 150kHz switching frequency, smaller external components, but lower 3A rating limited to 25°C; no integrated thermal foldback. | Better suited for space-constrained PCBs where inductor size matters more than thermal margin. | Choose LM2576BT for ruggedized industrial environments requiring proven thermal robustness and simpler EMI filtering. |
Compared with LM2576T-5.0 and LM2596T-5.0, the LM2576BT offers superior thermal performance at elevated ambient temperatures and a more forgiving EMI profile due to its lower 52kHz switching frequency-critical for noise-sensitive analog subsystems and long-term reliability in sealed enclosures.
Availability
LM2576BT is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, and embedded system power subsystems requiring stable component supply and long-lifecycle support.
Supply support for LM2576BT 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.
The LM2576BT belongs to TI's classic non-synchronous buck regulator product line, designed for cost-sensitive, thermally demanding DC-DC conversion in industrial and automotive applications where reliability and simplicity are prioritized over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for the LM2576BT?
The LM2576BT supports a maximum input voltage of 40V, making it suitable for 24V industrial bus and automotive battery-fed applications. This rating includes transient tolerance per the datasheet's absolute maximum ratings table. Operation above 40V risks permanent damage to the internal NPN switch. The LM2576BT maintains regulation down to 4V input, enabling use in cold-crank scenarios.
Does the LM2576BT require an external feedback resistor network?
No, the LM2576BT does not require an external feedback resistor network because it is configured for fixed 5V output. Pin 4 (FEEDBACK) is internally tied to ground, disabling the adjustable feedback path. This simplifies design, reduces component count, and improves output voltage accuracy to ±2% without calibration or trimming.
How is thermal management handled in the LM2576BT?
The LM2576BT incorporates thermal shutdown that activates at 165°C junction temperature, with automatic recovery after cooldown. Its TO-220-5 package features an exposed metal tab (connected to Pin 2/GND) providing 2.5°C/W junction-to-case thermal resistance. Effective heatsinking-via soldering the tab to ≥2in² copper area-is essential to sustain 3A output at ambient temperatures above 50°C.
Can the LM2576BT be used in automotive applications?
Yes, the LM2576BT is qualified for automotive body electronics applications due to its 4V–40V input range, which covers cold-crank (down to 4V) and load-dump (up to 40V) conditions. It meets AEC-Q100 stress-test requirements for temperature cycling and humidity exposure when sourced from TI's automotive-grade production lot. Always verify qualification status via TI's official part search tool.
What type of output capacitor is recommended for the LM2576BT?
Texas Instruments recommends a minimum 100µF aluminum electrolytic capacitor at the LM2576BT output, with low ESR (≤0.5Ω) and 16V or higher voltage rating. Ceramic capacitors may be added in parallel for high-frequency noise suppression, but the bulk electrolytic remains essential for loop stability and transient response. Using undersized or high-ESR capacitors can cause output ripple exceeding 100mV or instability.
LM2576BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576BT FAQ
1.How can I place an order for LM2576BT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576BT 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 LM2576BT reliable?
The price and inventory of LM2576BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576BT is usually 5 days.
3.What payment methods are accepted for LM2576BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576BT?
LM2576BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576BT 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 LM2576BT?
For technical support, including LM2576BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576BT requirements.
6.How does Aetrix verify that LM2576BT is sourced from the original manufacturer or authorized distributors?
All LM2576BT 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 LM2576BT meets industry standards.
7.What is the process for return or replacement of LM2576BT?
All LM2576BT units undergo pre-shipment inspection (PSI). If there is an issue with LM2576BT, 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 LM2576BT part is unused and in its original packaging.
Return procedure for LM2576BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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