My Inquiry
My Account
Microchip Technology LM2576-12BT
- Part No.:
- LM2576-12BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
LM2576-12BT.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,882
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2576-12BT from Texas Instruments is a step-down (buck) DC-DC switching regulator IC delivering fixed 12 V output at up to 3 A, with internal 41 kHz switching frequency, thermal shutdown, and current-limit protection. It operates from 4.75 V to 40 V input and is used in industrial power supplies and embedded system main rail regulation.
For engineers reviewing the LM2576-12BT datasheet, LM2576-12BT pinout, LM2576-12BT application, or LM2576-12BT equivalent, key selection factors include its fixed-output architecture, TO-220-5 package thermal performance, dropout behavior under load transients, and compatibility with standard buck external components (inductor, diode, capacitors).
Technical Context
The LM2576-12BT integrates a PWM controller, power switch, and protection circuitry in a single monolithic IC. Its fixed 12 V output eliminates external feedback resistor networks, simplifying design while maintaining ±2% output voltage tolerance over line, load, and temperature.
It uses a built-in NPN transistor switch rated for 3 A peak current and relies on external freewheeling diode, output inductor, and input/output capacitors. The 41 kHz switching frequency balances EMI control and component size, targeting cost-sensitive non-isolated buck converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±2%; eliminates need for feedback resistors and reduces BOM count. |
| Max Output Current | 3 A continuous; requires heatsinking in TO-220-5 package above ~1.5 A ambient load. |
| Input Voltage Range | 4.75 V to 40 V; supports wide-input industrial and automotive battery-fed systems. |
| Switching Frequency | 41 kHz nominal; enables use of low-cost, high-saturation-current inductors and reduces EMI filter complexity. |
| Thermal Shutdown | Activates at ~160°C junction temperature; latches off until cooldown, protecting against sustained overload. |
| Line/Load Regulation | ±0.4% line, ±0.2% load; ensures stable 12 V rail across varying input and output conditions. |
Pinout & Package
LM2576-12BT is housed in a TO-220-5 thermally enhanced package with exposed tab (pin 5), requiring mechanical mounting to heatsink for >1.5 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 4.75–40 V DC; must be bypassed with ≥100 µF electrolytic capacitor near pin. |
| 2 (OUT) | Switching node | Connects to inductor and freewheeling diode anode; high dv/dt node requiring short PCB trace. |
| 3 (GND) | Power ground reference | Common return for input cap, output cap, and control circuitry; separate from heatsink ground path. |
| 4 (FEEDBACK) | Output voltage sense | Internally tied to 12 V reference; left unconnected for fixed-output operation. |
| 5 (TAB) | Thermal pad / case | Electrically connected to GND; must be soldered to large copper area or heatsink for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 3 A NPN switch | Reduces external component count versus controller-only buck ICs; eliminates gate driver design. |
| Fixed 12 V output | Removes feedback resistor network, improving accuracy and reducing layout sensitivity to noise. |
| 41 kHz oscillator | Enables use of low-DCR, low-cost toroidal inductors and simplifies EMI filtering vs. MHz-range regulators. |
| Thermal shutdown + current limit | Provides self-protection during overload or poor heatsinking without external sensing circuitry. |
Applications
| Industrial Power Supply | Embedded System Main Rail |
|---|---|
Use Scenario: Converting 24 V DC bus to stable 12 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing main system power rail. Use Value: Delivers 3 A at 12 V with <1% load regulation, supporting multiple downstream LDOs and digital logic. | Use Scenario: Powering microcontroller, memory, and peripheral ICs in ruggedized edge gateway hardware. IC Role / Device Role / Timing Role: Step-down regulator generating clean 12 V intermediate rail before final LDO conversion. Use Value: Fixed output and integrated protection reduce design risk and qualification time for long-lifecycle deployments. |
| Automotive Aftermarket Electronics | Test Equipment Power Module |
Use Scenario: Regulating 12–36 V vehicle battery input to steady 12 V for dashcam or ADAS auxiliary modules. IC Role / Device Role / Timing Role: Input-tolerant buck converter handling cold-crank and load-dump transients. Use Value: 40 V max input rating and thermal shutdown enable reliable operation without external surge clamping. | Use Scenario: Providing adjustable 12 V source in benchtop power subsystems for DUT biasing. IC Role / Device Role / Timing Role: Fixed-output DC-DC stage replacing linear regulators to improve efficiency and reduce heat dissipation. Use Value: 77% typical efficiency at 2 A load cuts thermal load by >60% versus 7812-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-12W | Same 12 V fixed output, but in TO-263-5 surface-mount package; no through-hole mounting option. | Preferred for automated assembly and space-constrained PCBs; requires different thermal pad layout. | Select LM2576-12W when SMT production and board area are critical; LM2576-12BT remains optimal for manual prototyping and heatsink-integrated designs. |
| LM2596-12 | Higher 150 kHz switching frequency, lower 1.5 A output current, and different internal compensation network. | Better suited for compact designs with smaller magnetics; not drop-in due to differing pinout and transient response. | Choose LM2596-12 only if footprint and inductor size are primary constraints; LM2576-12BT offers higher current and proven robustness in industrial environments. |
Compared with LM2576-12W and LM2596-12, the LM2576-12BT provides superior thermal management via TO-220-5 mechanical interface, higher current capability, and field-proven reliability in high-temperature industrial enclosures-making it the preferred choice where serviceability and thermal margin are prioritized over miniaturization.
Availability
LM2576-12BT is available at Aetrix Electronics and suitable for industrial power supplies, embedded system main rails, and automotive aftermarket electronics requiring stable component supply and long-term manufacturability.
Supply support for LM2576-12BT 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, embedded processing, and power management technologies, with decades of leadership in power conversion ICs.
The LM2576 series was designed as a family of easy-to-use, cost-effective buck regulators targeting industrial, automotive, and consumer power applications where simplicity, reliability, and thermal resilience are essential.
FAQ
What is the maximum input voltage rating for the LM2576-12BT?
The LM2576-12BT supports a maximum input voltage of 40 V DC. This rating allows direct connection to 24 V industrial buses and 12 V automotive systems under load-dump conditions. Operation beyond 40 V risks permanent damage to the internal NPN switch. Always verify input transient suppression in automotive applications before deploying the LM2576-12BT.
Does the LM2576-12BT require external feedback resistors?
No, the LM2576-12BT does not require external feedback resistors because it features an internally trimmed 12 V output. Pin 4 (FEEDBACK) is internally connected to the 12 V reference and must remain unconnected in standard operation. Adding external resistors would disrupt regulation and is incompatible with the LM2576-12BT's fixed-output architecture.
Can the LM2576-12BT be used without a heatsink?
The LM2576-12BT can operate without an external heatsink only at light loads (<500 mA) and ambient temperatures below 40°C. At full 3 A load, junction temperature rises rapidly; the TO-220-5 package requires mechanical attachment of pin 5 (TAB) to a heatsink or large copper pour. Thermal derating curves in the official LM2576 datasheet must be consulted before finalizing the LM2576-12BT thermal design.
What type of output capacitor is recommended for the LM2576-12BT?
Texas Instruments recommends ≥100 µF low-ESR aluminum or tantalum electrolytic capacitors at the LM2576-12BT output. Ceramic capacitors alone are insufficient due to insufficient bulk capacitance and potential resonance issues. A parallel combination-e.g., 100 µF electrolytic + 10 µF ceramic-improves high-frequency ripple suppression while maintaining stability for the LM2576-12BT's 41 kHz loop.
Is the LM2576-12BT RoHS compliant and lead-free?
Yes, the LM2576-12BT is RoHS compliant and manufactured with lead-free terminations per TI's current product specifications. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and is qualified for reflow soldering. Always refer to the latest TI packaging and compliance documentation for the exact LM2576-12BT lot-specific certification status.
LM2576-12BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576-12BT FAQ
1.How can I place an order for LM2576-12BT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576-12BT 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 LM2576-12BT reliable?
The price and inventory of LM2576-12BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576-12BT is usually 5 days.
3.What payment methods are accepted for LM2576-12BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576-12BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576-12BT?
LM2576-12BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576-12BT 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 LM2576-12BT?
For technical support, including LM2576-12BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576-12BT requirements.
6.How does Aetrix verify that LM2576-12BT is sourced from the original manufacturer or authorized distributors?
All LM2576-12BT 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 LM2576-12BT meets industry standards.
7.What is the process for return or replacement of LM2576-12BT?
All LM2576-12BT units undergo pre-shipment inspection (PSI). If there is an issue with LM2576-12BT, 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 LM2576-12BT part is unused and in its original packaging.
Return procedure for LM2576-12BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576-12BT Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
