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Microchip Technology LM2575-12BT
- Part No.:
- LM2575-12BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
LM2575-12BT.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,010
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Product details
Overview
LM2575-12BT from Texas Instruments is a monolithic 1-A step-down voltage regulator IC with fixed 12 V output, 40 V input rating, 52 kHz switching frequency, and thermal shutdown protection. It operates in buck topology for DC-DC conversion in industrial power supplies requiring stable mid-voltage rails.
For engineers reviewing the LM2575-12BT datasheet, LM2575-12BT pinout, LM2575-12BT application, or LM2575-12BT equivalent, key selection criteria include output voltage accuracy (±4%), dropout behavior under load transients, thermal performance in TO-220 packages, and compatibility with standard external diode/capacitor configurations.
Technical Context
The LM2575-12BT integrates an internal NPN switch, oscillator, error amplifier, and current-limit circuitry to implement a complete 1-A buck regulator. Its fixed 12 V output eliminates external feedback resistor networks, simplifying design while maintaining ±4% output tolerance over line, load, and temperature.
Operating at 52 kHz, the device enables use of low-cost, high-value electrolytic capacitors and standard 1N5822 Schottky diodes. Internal thermal shutdown and current limiting provide robust fault protection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4%; eliminates need for external feedback resistors and reduces BOM count. |
| Max Input Voltage | 40 V; supports wide-input industrial and automotive battery-supplied systems. |
| Output Current | 1 A continuous; sufficient for powering microcontrollers, sensors, and analog front-ends. |
| Switching Frequency | 52 kHz nominal; enables use of low-cost 100–470 µF output capacitors and avoids EMI-sensitive bands. |
| Efficiency | Up to 88% at 12 V out / 24 V in / 1 A load; reduces thermal load in enclosed enclosures. |
| Thermal Shutdown | Activates at ~160 °C junction; protects against sustained overload or poor heatsinking. |
Pinout & Package
LM2575-12BT is housed in a TO-220-5 package with exposed tab for thermal conduction. The tab is electrically connected to Pin 2 (Ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VIN) | Input voltage supply | Accepts 4.75 V to 40 V DC; requires local 100 µF electrolytic + 0.1 µF ceramic bypass. |
| Pin 2 (GND) | Power and control ground | Common reference for internal circuitry and thermal path; connects to exposed tab. |
| Pin 3 (OUT) | Switched output node | Drives external catch diode and output LC filter; peak voltage reaches VIN during off-time. |
| Pin 4 (FEEDBACK) | Internal voltage sense | Internally tied to 12 V regulation point; not accessible externally on fixed-output variants. |
| Pin 5 (ON/OFF) | Enable/disable control | Logic-high (>2.5 V) enables operation; logic-low (<1.3 V) disables switching and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Removes external resistor divider, improving long-term stability and reducing layout sensitivity. |
| Integrated 1-A NPN switch | Eliminates need for external transistor and driver, lowering component count and PCB area. |
| 52 kHz oscillator | Enables use of standard, low-ESR aluminum electrolytic capacitors instead of costly tantalum or polymer types. |
| Thermal shutdown + current limit | Provides self-protection during short-circuit or overheating without external sensing circuitry. |
Applications
| Industrial Power Supply | Automotive Control Module |
|---|---|
Use Scenario: Providing regulated 12 V rail from 24 V truck battery in engine control units. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator delivering clean, stable 12 V to MCU and CAN transceivers. Use Value: Withstands 40 V load-dump transients and maintains regulation down to 4.75 V input, ensuring system uptime. | Use Scenario: Generating 12 V for dashboard instrumentation powered by 12 V lead-acid battery. IC Role / Device Role / Timing Role: Fixed-output step-down regulator supplying power to analog gauges and display drivers. Use Value: Delivers 1 A at ±4% accuracy across -40 °C to +125 °C ambient, meeting automotive grade requirements. |
| Embedded Sensor Node | Legacy Equipment Retrofit |
Use Scenario: Powering 12 V analog sensors and signal conditioners in factory-floor wireless nodes. IC Role / Device Role / Timing Role: Compact, thermally robust voltage regulator replacing linear regulators to reduce heat dissipation. Use Value: 88% efficiency at full load cuts thermal rise by >25 °C versus 78L12 linear regulator, extending field life. | Use Scenario: Replacing aging 7812 linear regulators in legacy PLC I/O modules. IC Role / Device Role / Timing Role: Drop-in switching upgrade offering higher efficiency and wider input range than obsolete linear parts. Use Value: Accepts same 16–32 V unregulated input as original 7812 designs while delivering cooler, more reliable operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575H-12T | Higher temperature grade (–40 °C to +125 °C vs. –40 °C to +125 °C same), identical electrical specs and pinout. | No functional difference; rated for extended ambient but same thermal derating curve. | Select LM2575H-12T only if full industrial temp range certification documentation is required. |
| LM2596-12 | Higher switching frequency (150 kHz), lower quiescent current (5 mA vs. 10 mA), same 12 V fixed output and TO-220-5 package. | Better suited for compact designs needing smaller output capacitors; slightly improved light-load efficiency. | Choose LM2596-12 when board space is constrained or when optimizing for standby power in battery-backed systems. |
Compared with LM2575H-12T, the LM2575-12BT offers identical performance but lacks formal extended-temp qualification documentation; versus LM2596-12, it trades higher-frequency operation for proven ruggedness in high-noise industrial environments and simpler EMI filtering.
Availability
LM2575-12BT is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, and embedded sensor nodes requiring stable component supply and long-lifecycle support.
Supply support for LM2575-12BT 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 and embedded processing technologies, with leadership in power management ICs since the 1980s.
The LM2575 series was designed as a cost-effective, easy-to-use replacement for linear regulators in medium-power DC-DC applications, emphasizing reliability, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LM2575-12BT?
The LM2575-12BT has a maximum input voltage rating of 40 V DC. This allows it to operate reliably across wide-input industrial and automotive battery systems, including 24 V nominal supplies subject to load-dump transients. Operation above 40 V may cause permanent damage to the internal NPN switch.
Does the LM2575-12BT require an external feedback network?
No, the LM2575-12BT does not require an external feedback network. It is a fixed-output variant with internal 12 V regulation, tying the FEEDBACK pin internally to the output reference. External resistors are unnecessary, reducing part count and improving long-term output stability.
Can the LM2575-12BT be used in automotive applications?
Yes, the LM2575-12BT is suitable for automotive applications such as control modules and instrumentation. It operates across –40 °C to +125 °C junction temperature, withstands 40 V input transients, and delivers 12 V ±4% output accuracy - meeting core requirements for 12 V subsystem power in passenger and commercial vehicles.
What type of catch diode is recommended for use with the LM2575-12BT?
A Schottky diode such as the 1N5822 is recommended for the LM2575-12BT. Its low forward voltage (~0.5 V) minimizes conduction loss, and its fast recovery prevents reverse-recovery spikes. The diode must be rated for ≥3 A peak inverse current and ≥100 V PIV to handle worst-case input transients and switching stress.
How does thermal management work on the LM2575-12BT?
The LM2575-12BT uses its TO-220-5 package's exposed tab as both thermal and electrical ground (Pin 2). Effective heatsinking requires mechanical mounting of the tab to a copper plane or external heatsink. Internal thermal shutdown activates at ~160 °C junction temperature, halting switching until safe cooldown occurs.
LM2575-12BT 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:
- 1A
- 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
LM2575-12BT FAQ
1.How can I place an order for LM2575-12BT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12BT 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 LM2575-12BT reliable?
The price and inventory of LM2575-12BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12BT is usually 5 days.
3.What payment methods are accepted for LM2575-12BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-12BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-12BT?
LM2575-12BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12BT 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 LM2575-12BT?
For technical support, including LM2575-12BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12BT requirements.
6.How does Aetrix verify that LM2575-12BT is sourced from the original manufacturer or authorized distributors?
All LM2575-12BT 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 LM2575-12BT meets industry standards.
7.What is the process for return or replacement of LM2575-12BT?
All LM2575-12BT units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12BT, 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 LM2575-12BT part is unused and in its original packaging.
Return procedure for LM2575-12BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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