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Microchip Technology LM2576-12BU TR
- Part No.:
- LM2576-12BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576-12BU TR.pdf
- Description:
- IC REG BUCK 12V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
LM2576-12BU TR from Texas Instruments is a step-down (buck) switching regulator IC delivering fixed 12 V output at up to 3 A, with 40 V input voltage rating, 52 kHz switching frequency, and internal 3.0 A switch. It is used in industrial power supplies and embedded systems requiring regulated DC power from unregulated sources.
For engineers reviewing the LM2576-12BU TR datasheet, LM2576-12BU TR pinout, LM2576-12BU TR application, or LM2576-12BU TR equivalent, key selection factors include output voltage accuracy (±2%), thermal shutdown protection, input voltage range (4.75 V to 40 V), and TO-220-5 package compatibility with heatsink mounting.
Technical Context
The LM2576-12BU TR integrates a PWM controller, power transistor, and internal compensation network into a single monolithic IC. Its fixed-frequency current-mode control architecture ensures stable regulation across line and load variations without external loop compensation.
It operates in continuous conduction mode with cycle-by-cycle current limiting and includes built-in thermal shutdown, overvoltage protection, and undervoltage lockout (UVLO) that disables operation below ~3.8 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±2%; eliminates need for external feedback resistors. |
| Max Output Current | 3.0 A continuous; supports mid-power industrial loads without external pass devices. |
| Input Voltage Range | 4.75 V to 40 V; compatible with 12 V/24 V battery systems and rectified AC rails. |
| Switching Frequency | 52 kHz nominal; enables use of standard low-cost electrolytic output capacitors. |
| Thermal Shutdown | Activates at ~160 °C junction temperature; protects device during overload or poor heatsinking. |
| Line Regulation | ±0.1% typical over full input range; maintains tight output stability despite input ripple or sag. |
Pinout & Package
LM2576-12BU TR is housed in a TO-220-5 (Straight Lead) thermally enhanced package with exposed metal tab for heatsink attachment. Pin 1 is Input, Pin 2 is Ground, Pin 3 is Output, Pin 4 is Feedback (internally tied to 12 V reference), Pin 5 is ON/OFF (active-low enable).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Power Input | Accepts 4.75–40 V unregulated DC; requires local ceramic bypass capacitor. |
| Pin 2 (GND) | Power Ground | Common return for input, output, and internal circuitry; connects to heatsink tab. |
| Pin 3 (OUT) | Regulated Output | Delivers 12 V @ up to 3 A; connects to output filter inductor and capacitor. |
| Pin 4 (FB) | Feedback Input | Internally connected to 12 V reference; not user-accessible for adjustment. |
| Pin 5 (ON/OFF) | Enable Control | Active-low logic input; pulls low to disable regulator and reduce quiescent current to 75 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 3.0 A Power Switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity. |
| Fixed 12 V Output | Guarantees precise regulation without resistor divider tuning or calibration. |
| 52 kHz Fixed-Frequency PWM | Enables predictable EMI filtering and simplifies inductor selection using standard off-the-shelf parts. |
| Thermal Shutdown + UVLO | Provides autonomous fault recovery and prevents startup under insufficient input conditions. |
Applications
| Industrial Power Supply | Embedded System Rail |
|---|---|
Use Scenario: Converting 24 VDC bus to stable 12 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing isolated, filtered, and protected 12 V rail. Use Value: Delivers 3 A continuous current with ±2% output accuracy and thermal foldback, ensuring reliable operation in cabinet-mounted enclosures. | Use Scenario: Generating 12 V supply for microcontroller peripherals, relays, and analog front-ends in edge gateways. IC Role / Device Role / Timing Role: Main system power regulator with ON/OFF control synchronized to host processor sleep states. Use Value: Active-low enable pin allows <75 µA standby current, supporting low-power wake-on-event designs. |
| Automotive Aftermarket | Test Equipment Power |
Use Scenario: Regulating vehicle battery voltage (9–16 V) to clean 12 V for dash cameras and ADAS add-ons. IC Role / Device Role / Timing Role: Input-transient-tolerant buck converter with built-in UVLO and thermal protection. Use Value: Withstands cold-crank dips down to 4.75 V and hot ambient up to 125 °C junction, meeting automotive-grade reliability needs. | Use Scenario: Providing stable 12 V bias for benchtop oscilloscope probes and signal generators. IC Role / Device Role / Timing Role: Low-noise, high-stability DC source with minimal output ripple (<1% peak-to-peak). Use Value: Achieves <150 mVpp output ripple with recommended LC filter, enabling accurate analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576H-12 | Same topology and pinout, but rated for 125 °C junction temperature (vs. 150 °C for LM2576-12BU TR); uses TO-220-5 package with different thermal pad design. | Preferred for extended-temperature industrial environments where long-term reliability above 105 °C ambient is required. | Select LM2576H-12 only if operating ambient exceeds 85 °C and full 125 °C TJ margin is needed. |
| LM2596-12 | Higher 150 kHz switching frequency, lower 3 A max output current, and different internal compensation; requires smaller inductors but exhibits higher switching losses. | Better suited for space-constrained PCBs where compact magnetics are prioritized over thermal efficiency. | Choose LM2596-12 when board area is critical and thermal management is less constrained than in LM2576-12BU TR deployments. |
Compared with LM2576H-12 and LM2596-12, the LM2576-12BU TR offers superior thermal robustness at 150 °C TJ and lower EMI due to its 52 kHz frequency, making it optimal for high-reliability industrial and automotive power conversion where heatsink integration and noise control are essential.
Availability
LM2576-12BU TR is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rails, and automotive aftermarket electronics requiring stable component supply and long-lifecycle support.
Supply support for LM2576-12BU TR 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 specializing in analog and embedded processing technologies, with leadership in power management ICs since the 1980s.
The LM2576 series was designed for cost-sensitive, high-reliability DC-DC conversion in industrial, automotive, and telecom infrastructure applications where simplicity, thermal resilience, and long-term manufacturability are critical.
FAQ
What is the maximum input voltage rating for the LM2576-12BU TR?
The LM2576-12BU TR supports an absolute maximum input voltage of 40 V. Operation above this level risks permanent damage to the internal power switch. For reliable performance, TI recommends maintaining input within 4.75 V to 40 V, with derating advised above 35 V under high-temperature conditions. The LM2576-12BU TR includes undervoltage lockout to prevent startup below ~3.8 V.
Does the LM2576-12BU TR require external feedback resistors to set output voltage?
No. The LM2576-12BU TR features a factory-trimmed internal feedback network configured for a fixed 12 V output. Pin 4 (FB) is internally connected to the 12 V reference and is not accessible for external adjustment. This eliminates resistor tolerance errors and reduces component count. The LM2576-12BU TR is not adjustable - alternative variants like LM2576-ADJ must be used for variable outputs.
Can the LM2576-12BU TR be used without a heatsink?
The LM2576-12BU TR can operate without an external heatsink only at light loads (<500 mA) and ambient temperatures ≤40 °C. At full 3 A load, junction temperature rises rapidly; TI specifies a maximum junction temperature of 150 °C and recommends mounting the TO-220-5 package's exposed tab to a heatsink with thermal interface material. Without heatsinking, sustained 3 A operation exceeds safe thermal limits within seconds.
What is the purpose of the ON/OFF pin (Pin 5) on the LM2576-12BU TR?
Pin 5 is an active-low enable input. Pulling it low disables the internal power switch and reduces quiescent current to approximately 75 µA, placing the LM2576-12BU TR in standby mode. Leaving it open or pulled high enables normal regulation. This feature allows host microcontrollers to manage system-level power sequencing and low-power sleep states. The LM2576-12BU TR does not support analog dimming or PWM modulation via this pin.
Is the LM2576-12BU TR RoHS compliant and lead-free?
Yes, the LM2576-12BU TR is RoHS compliant and lead-free per TI's official product change notification (PCN) and packaging data. The "BU" suffix denotes a TO-220-5 package with lead-free matte tin plating and halogen-free molding compound. TI confirms full compliance with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) 3. The LM2576-12BU TR meets IPC/JEDEC J-STD-033 handling requirements.
LM2576-12BU TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- 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:
- TO-263-5
LM2576-12BU TR FAQ
1.How can I place an order for LM2576-12BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576-12BU TR 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 LM2576-12BU TR reliable?
The price and inventory of LM2576-12BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576-12BU TR is usually 5 days.
3.What payment methods are accepted for LM2576-12BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576-12BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576-12BU TR?
LM2576-12BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576-12BU TR 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 LM2576-12BU TR?
For technical support, including LM2576-12BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576-12BU TR requirements.
6.How does Aetrix verify that LM2576-12BU TR is sourced from the original manufacturer or authorized distributors?
All LM2576-12BU TR 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 LM2576-12BU TR meets industry standards.
7.What is the process for return or replacement of LM2576-12BU TR?
All LM2576-12BU TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2576-12BU TR, 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 LM2576-12BU TR part is unused and in its original packaging.
Return procedure for LM2576-12BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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