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Microchip Technology LM2575-5.0BU
- Part No.:
- LM2575-5.0BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575-5.0BU.pdf
- Description:
- IC REG BUCK 5V 1A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,811
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Product details
Overview
LM2575-5.0BU from Micrel Inc. is a monolithic 5V fixed-output buck switching regulator in TO-263 package, delivering up to 1A output current with ±3% output voltage accuracy, 52kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion from 7–40V input.
For engineers reviewing the LM2575-5.0BU datasheet, LM2575-5.0BU pinout, LM2575-5.0BU application, or LM2575-5.0BU equivalent, key selection criteria include guaranteed 1A load capability, 82% typical efficiency at 12VIN/5VOUT/1A, TO-263 thermal performance (θJA = 45°C/W), and compatibility with standard off-the-shelf 330µH inductors and Schottky catch diodes.
Technical Context
The LM2575-5.0BU integrates a 52kHz oscillator, error amplifier with 1.23V internal reference, PWM comparator, and 1A NPN switch driver. Its feedback loop uses a fixed 5V output divider embedded in the die, eliminating external resistors required by adjustable versions.
Thermal shutdown activates at 150°C junction temperature, and current limiting trips at 1.7–3.2A peak switch current. Standby quiescent current drops to ≤200µA when the ON/OFF pin is pulled high, enabling low-power system control.
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 logic supply without trimming. |
| Max Output Current | 1A continuous - supports microcontroller cores, sensors, and peripheral rails in embedded systems. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) with minimal EMI filtering. |
| Efficiency | 82% typical at 12VIN, 5VOUT, 1A - reduces thermal load vs. linear regulators, often eliminating heatsinks. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial, automotive, and telecom power buses. |
| Quiescent Current | ≤10mA operating, ≤200µA standby - enables battery-backed or always-on subsystems with low idle power. |
| Protection Features | Integrated cycle-by-cycle current limit and thermal shutdown - prevents damage during short-circuit or overload events without external circuitry. |
Pinout & Package
LM2575-5.0BU uses a 5-pin TO-263 (D2PAK) surface-mount package with exposed thermal pad for enhanced heat dissipation (θJA = 45°C/W with ~1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Input power supply connection | Accepts 4–40V unregulated DC; requires ≥100µF input capacitance for stability and ripple suppression. |
| 2: OUTPUT | Switch node / power output | Drives external inductor; connects to cathode of Schottky catch diode (e.g., MBR360) and output capacitor. |
| 3: GND | Power ground reference | Common return for input/output capacitors and catch diode anode; must be low-inductance single-point connection. |
| 4: FB | Feedback input (internal 5V divider) | Internally connected; no external components needed - distinguishes fixed from adjustable variants. |
| 5: ON/OFF | Enable/disable control input | Logic-high (>2.2V) disables regulator (≤200µA IQ); logic-low (<1.0V) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity in cost-sensitive designs. |
| 52kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with standardized inductor families (e.g., AIE 415-0926). |
| Integrated thermal shutdown | Automatically disables switching at 150°C junction temperature, protecting PCB and adjacent components during sustained overload. |
| ON/OFF logic control | Supports system-level power sequencing and sleep-mode management via microcontroller GPIO without level-shifting. |
| 1A output with no external pass transistor | Reduces solution size and component count versus linear regulators paired with discrete MOSFETs or BJTs. |
Applications
| Industrial Sensor Node Power | Embedded Controller Pre-regulator |
|---|---|
Use Scenario: Powering 3.3V/5V microcontrollers, analog front-ends, and RS-485 transceivers in remote environmental monitoring units. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator converting 12–24V field bus to stable 5V rail. Use Value: 82% efficiency minimizes self-heating in sealed enclosures; TO-263 thermal pad enables conduction cooling without heatsink. |
Use Scenario: Generating clean 5V intermediate rail for downstream LDOs feeding FPGA I/O banks or ADC reference circuits. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing dropout and thermal stress on precision linear regulators. Use Value: Fixed 5V output eliminates resistor tolerance errors; ±3% regulation ensures consistent LDO headroom across line/load variations. |
| On-Board Telecom Power | POS Terminal Power Supply |
Use Scenario: Converting 48V telecom battery backup to 5V for payment processing modules and display drivers. IC Role / Device Role / Timing Role: Primary buck converter handling wide-input transients (up to 40V) in distributed power architecture. Use Value: 4–40V input range accommodates brownout and surge conditions; thermal shutdown prevents latch-up during hot-swap events. |
Use Scenario: Powering barcode scanners, receipt printers, and touchscreens in retail point-of-sale terminals with 12V wall adapters. IC Role / Device Role / Timing Role: Compact, low-noise 5V source replacing bulky linear supplies in space-constrained enclosures. Use Value: TO-263 package allows automated SMT assembly; 1A rating supports simultaneous peripheral activation without voltage droop. |
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 and TO-263 package, but RoHS-compliant with high-melting solder exemption per ordering table. | No functional difference; selected when lead-free compliance is mandated for final product certification. | Choose LM2575-5.0WU if RoHS-6 compliance is required; otherwise LM2575-5.0BU meets standard industrial requirements. |
| LM2596-5.0 | Higher 150kHz switching frequency, 3A output rating, and improved 4% output accuracy; requires different inductor value (e.g., 47µH). | Better suited for higher-current or smaller-filter designs; not pin-compatible due to different pinout and thermal pad configuration. | Select LM2596-5.0 only when >1A load or tighter size constraints justify redesign; LM2575-5.0BU remains optimal for proven 1A legacy layouts. |
Compared with LM2575-5.0WU, the LM2575-5.0BU offers identical performance with non-RoHS lead finish; versus LM2596-5.0, it trades higher current and frequency for proven reliability, simpler magnetics, and direct drop-in replacement in existing TO-263 footprints.
Availability
LM2575-5.0BU is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded controller pre-regulators, and on-board telecom power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575-5.0BU 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 power management, analog, and mixed-signal ICs before its acquisition by Microchip Technology in 2015.
The LM2575 series was designed as a drop-in switching alternative to three-terminal linear regulators, targeting cost-sensitive, thermally constrained industrial and embedded power applications where efficiency and simplicity were critical.
FAQ
What is the maximum input voltage rating for the LM2575-5.0BU?
The LM2575-5.0BU has an absolute maximum input voltage of 45V, with recommended continuous operation up to 40V. Exceeding 40V may trigger internal protection or reduce reliability; the device is rated for stable 5V output across 7–40V input in typical applications per the datasheet test conditions.
Does the LM2575-5.0BU require external feedback resistors?
No. The LM2575-5.0BU is a fixed-output variant with internal feedback divider set for 5.0V, so pins 1 (VIN), 2 (OUTPUT), 3 (GND), 4 (FB), and 5 (ON/OFF) connect directly without external resistors. This distinguishes it from adjustable versions like LM2575 and simplifies design and layout.
What thermal performance can be expected from the LM2575-5.0BU in a standard PCB layout?
With approximately 1 square inch of copper area surrounding the leads and thermal pad, the LM2575-5.0BU achieves θJA = 45°C/W. At 1A load and 12V input, junction temperature rise is ~37°C above ambient - typically allowing operation without a heatsink in environments ≤85°C ambient.
Can the LM2575-5.0BU be used in negative-output configurations?
Yes - the LM2575-5.0BU supports inverting buck-boost topology to generate regulated negative voltages, as documented in the "Typical Applications" section. In this mode, the device regulates |VOUT| = 5V with reversed inductor and diode orientation, maintaining the same 1A capability and protection features.
Is the LM2575-5.0BU pin-compatible with other packages in the LM2575 family?
No - the LM2575-5.0BU (TO-263) shares pin numbering and function with the TO-220 variant (LM2575-5.0BT), but differs mechanically and thermally from DIP (N) and SOIC (WM) packages. PCB layout must match the 5-pin TO-263 footprint; land pattern and thermal pad design are not interchangeable with other packages.
LM2575-5.0BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
LM2575-5.0BU FAQ
1.How can I place an order for LM2575-5.0BU through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-5.0BU 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 LM2575-5.0BU reliable?
The price and inventory of LM2575-5.0BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-5.0BU is usually 5 days.
3.What payment methods are accepted for LM2575-5.0BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-5.0BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-5.0BU?
LM2575-5.0BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-5.0BU 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 LM2575-5.0BU?
For technical support, including LM2575-5.0BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-5.0BU requirements.
6.How does Aetrix verify that LM2575-5.0BU is sourced from the original manufacturer or authorized distributors?
All LM2575-5.0BU 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 LM2575-5.0BU meets industry standards.
7.What is the process for return or replacement of LM2575-5.0BU?
All LM2575-5.0BU units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-5.0BU, 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 LM2575-5.0BU part is unused and in its original packaging.
Return procedure for LM2575-5.0BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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