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Microchip Technology LM2575-5.0BT
- Part No.:
- LM2575-5.0BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
LM2575-5.0BT.pdf
- Description:
- IC REG BUCK 5V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,120
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Product details
Overview
LM2575-5.0BT from Micrel is a fixed-output 5.0V, 1A step-down (buck) switching regulator in a 5-pin TO-220 package, operating at 52kHz with ±3% output voltage accuracy over 4V–40V input and full load range, used for high-efficiency on-card DC-DC conversion in industrial power supplies.
For engineers reviewing the LM2575-5.0BT datasheet, LM2575-5.0BT pinout, LM2575-5.0BT application, or LM2575-5.0BT equivalent, this page delivers verified electrical specs, thermal performance data, functional block diagram context, real-world efficiency curves, and validated alternative options - all specific to the LM2575-5.0BT variant and its TO-220 package configuration.
Technical Context
The LM2575-5.0BT integrates a 52kHz oscillator, internal current-limit protection (1.7–3.2A peak), thermal shutdown, and a 1.23V bandgap reference with fixed-gain error amplifier. Its feedback node is internally tied to generate 5.0V output without external resistors.
It uses cycle-by-cycle current limiting and fixed-frequency PWM control to regulate output under line/load transients. The internal switch exhibits 0.9V typical saturation voltage at 1A, enabling >82% efficiency at 12V input/5V output/1A load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 0.2–1A load and 8–40V input - ensures stable rail for microcontrollers and logic without trimming. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, standard 330µH inductors and simplifies EMI filtering design. |
| Max Output Current | 1A continuous - supports single-rail powering of FPGA I/O banks, sensors, or analog front-ends. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial 12V/24V systems and automotive battery variations. |
| Efficiency | 82% typical at VIN=12V, VOUT=5V, IOUT=1A - reduces thermal load vs. linear regulators, often eliminating heatsinks. |
| Standby Current | <200µA when ON/OFF pin = 5V - enables low-power sleep modes in battery-backed systems. |
| Thermal Resistance | θJA = 65°C/W (TO-220, no heatsink) - defines junction temperature rise under 1A load for PCB copper area planning. |
Pinout & Package
LM2575-5.0BT is housed in a 5-pin TO-220 package with exposed tab (pin 3) serving as GND and thermal path. Mounting orientation and PCB copper area directly impact θJA (65°C/W min. copper, 45°C/W with 4 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Unregulated input supply | Accepts 4–40V DC; requires ≥100µF bulk capacitance close to pin for stability and ripple suppression. |
| 2: OUTPUT | Switched output node | Drives external catch diode (e.g., MBR360) and inductor; high dI/dt path requiring short trace routing. |
| 3: GND | Power ground / tab | Common return for input/output capacitors and thermal interface; must be connected to large copper pour. |
| 4: FB | Feedback (internal connection) | Internally tied to 5.0V reference; not accessible - eliminates resistor divider layout errors for fixed-output operation. |
| 5: ON/OFF | Enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<1.0V) disables output and reduces IQ to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and tolerance drift risk. |
| Integrated thermal shutdown | Automatically disables switching if junction exceeds 150°C - prevents catastrophic failure during overload or poor heatsinking. |
| Cycle-by-cycle current limit | Clamps peak switch current to ≥1.7A - protects against short-circuit output faults without external sensing. |
| Low quiescent current | 5mA typical operating IQ - minimizes no-load power loss in always-on subsystems like monitoring circuits. |
| Standard inductor compatibility | Optimized for off-the-shelf 330µH shielded inductors (e.g., AIE 415-0926) - accelerates power stage validation. |
Applications
| Industrial PLC I/O Power | Embedded Controller Core Supply |
|---|---|
|
Use Scenario: Providing isolated 5V rail for digital I/O modules in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24V to clean 5V for optocoupler drivers and level translators. Use Value: Delivers 1A at 82% efficiency with no heatsink required, reducing module size and thermal management overhead. |
Use Scenario: Generating 5V for ARM Cortex-M4 microcontroller core and peripherals in edge-sensing gateways. IC Role / Device Role / Timing Role: Main system regulator supplying VDD and VDDA rails, synchronized to internal 52kHz clock for predictable noise spectrum. Use Value: Fixed 5.0V output ensures consistent ADC reference and USB PHY compliance without calibration. |
| On-Board Telecom Power | Test Equipment Auxiliary Rail |
|
Use Scenario: Local 5V supply for Ethernet PHY and management MCU on telecom line cards powered from -48V backplane. IC Role / Device Role / Timing Role: Buck pre-regulator stepping -48V (via intermediate +12V) down to 5V, handling transient surges per GR-1089. Use Value: 40V max input rating and thermal shutdown enable robust operation in harsh telecom environments. |
Use Scenario: Secondary 5V rail in benchtop multimeters and signal generators where low-noise, stable supply is critical. IC Role / Device Role / Timing Role: Low-ripple DC-DC source feeding precision DACs and reference buffers, with ON/OFF pin enabling instrument sleep mode. Use Value: <200µA standby current extends battery life in portable test gear; ±3% output tolerance meets Class II accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-5.0WU | Same electrical specs, but TO-263 (SMD) package with θJA = 45°C/W - lower thermal resistance due to larger pad area. | Preferred for automated assembly and higher-density layouts; requires reflow-compatible PCB design. | Select LM2575-5.0WU when board space is constrained and thermal performance demands SMT mounting with thermal vias. |
| LM2596-5.0 | Higher 150kHz switching frequency, 3A output rating, and ±2% output tolerance - different internal architecture and compensation. | Better suited for compact designs needing higher current or tighter regulation; requires different inductor/capacitor values. | Choose LM2596-5.0 only when upgrading current capability or improving regulation accuracy is required - not a drop-in replacement. |
Compared with LM2575-5.0BT, LM2575-5.0WU offers identical regulation but superior thermal performance in SMT form, while LM2596-5.0 provides higher current and accuracy at the cost of redesigning the power stage and control loop.
Availability
LM2575-5.0BT is available at Aetrix Electronics and suitable for industrial PLCs, embedded controller power, telecom line cards, test equipment, and on-board DC-DC conversion requiring stable component supply across extended temperature ranges.
Supply support for LM2575-5.0BT 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
Micrel Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The LM2575 series was designed as a high-efficiency, simple-to-use buck regulator family targeting cost-sensitive industrial and embedded applications where thermal simplicity and minimal external components were critical.
FAQ
What is the maximum input voltage rating for LM2575-5.0BT?
The LM2575-5.0BT has an absolute maximum input voltage of 45V, with guaranteed operation up to 40V across the full –40°C to +85°C temperature range. Exceeding 40V may cause premature device stress or reduced lifetime, even if below the 45V absolute limit.
Does LM2575-5.0BT require external feedback resistors?
No - the LM2575-5.0BT is a fixed-output variant with internal feedback network set to 5.0V, so pins 1 (VIN), 2 (OUTPUT), 3 (GND), 4 (FB), and 5 (ON/OFF) are fully functional without any external resistors. Pin 4 (FB) is not externally accessible.
What is the thermal resistance (θJA) of LM2575-5.0BT in typical mounting?
The LM2575-5.0BT has a junction-to-ambient thermal resistance (θJA) of 65°C/W when mounted vertically in a socket or on a PCB with minimal copper. With ~4 in² of copper area surrounding the leads, θJA improves to 45°C/W - critical for 1A continuous operation without a heatsink.
Can LM2575-5.0BT be used in negative-output configurations?
Yes - the LM2575-5.0BT can be configured as an inverting buck-boost converter to generate negative output voltages, as documented in Micrel's application notes. This requires reconfiguring the inductor and diode placement, with output polarity reversed relative to GND.
What protection features are integrated into LM2575-5.0BT?
The LM2575-5.0BT includes cycle-by-cycle current limiting (1.7–3.2A peak), thermal shutdown (activates at ~150°C junction), and low-standby-current disable via the ON/OFF pin. These functions operate autonomously without external circuitry to ensure safe operation under fault conditions.
LM2575-5.0BT 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):
- 5V
- 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
LM2575-5.0BT FAQ
1.How can I place an order for LM2575-5.0BT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-5.0BT 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 LM2575-5.0BT reliable?
The price and inventory of LM2575-5.0BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-5.0BT is usually 5 days.
3.What payment methods are accepted for LM2575-5.0BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-5.0BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-5.0BT?
LM2575-5.0BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-5.0BT 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 LM2575-5.0BT?
For technical support, including LM2575-5.0BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-5.0BT requirements.
6.How does Aetrix verify that LM2575-5.0BT is sourced from the original manufacturer or authorized distributors?
All LM2575-5.0BT 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 LM2575-5.0BT meets industry standards.
7.What is the process for return or replacement of LM2575-5.0BT?
All LM2575-5.0BT units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-5.0BT, 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 LM2575-5.0BT part is unused and in its original packaging.
Return procedure for LM2575-5.0BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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