My Inquiry
My Account
Microchip Technology LM2575-5.0BU TR
- Part No.:
- LM2575-5.0BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575-5.0BU TR.pdf
- Description:
- IC REG BUCK 5V 1A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,695
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2575-5.0BU TR from Micrel is a monolithic 5V fixed-output buck switching regulator 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 operates from 4V to 40V input and replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575-5.0BU TR datasheet, LM2575-5.0BU TR pinout, LM2575-5.0BU TR application, or LM2575-5.0BU TR equivalent, key selection factors include guaranteed 1A load capability, TO-263 package thermal performance (θJA = 45°C/W), 82% typical efficiency at 12VIN/5VOUT/1A, and ON/OFF control with <200µA standby current.
Technical Context
The LM2575-5.0BU TR integrates a 52kHz oscillator, error amplifier with 1.23V internal reference, PWM comparator, and 1A NPN switch driver in a single TO-263 package. Its feedback loop uses an internal 5V reference for fixed-output regulation-no external resistor divider required.
Thermal shutdown activates at 150°C junction temperature, and current limiting protects against overload by clamping peak switch current to 1.7–3.2A. The ON/OFF pin supports logic-level control with VIH ≥ 2.2V and VIL ≤ 1.0V, enabling low-power system sequencing.
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 microcontroller or logic rail without trimming. |
| Max Output Current | 1A continuous - supports single-rail embedded systems like PLC I/O modules or sensor interfaces. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial sources including 24V DC buses and automotive battery variations. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, standard 330µH inductors and simplifies EMI filtering design. |
| Efficiency | 82% typical at 12VIN, 5VOUT, 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 or energy-conscious systems. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during short-circuit or overtemperature events without external circuitry. |
Pinout & Package
LM2575-5.0BU TR uses a 5-pin TO-263 (D2Pak) surface-mount package with exposed tab for thermal dissipation. Pin 1: VIN, Pin 2: OUTPUT, Pin 3: GND, Pin 4: FEEDBACK (internally connected to 5V reference for fixed version), Pin 5: ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 4–40V unregulated DC; requires 100µF input capacitor for stability and ripple suppression. |
| 2 - OUTPUT | Switched output node | Drives external catch diode (e.g., MBR360) and output inductor; carries pulsed 1A current. |
| 3 - GND | Power and signal ground reference | Must be low-impedance connection; shared return path for input cap, output cap, and feedback network. |
| 4 - FB | Feedback input | Internally tied to 5V reference in LM2575-5.0BU TR - no external resistors needed; open-circuit tolerant. |
| 5 - ON/OFF | Enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<1.0V) disables output and reduces quiescent current to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Eliminates external feedback resistors - reduces BOM count and layout sensitivity in cost-sensitive designs. |
| Integrated current limit & thermal shutdown | Enables self-protected operation without external sensing or fault-handling circuitry. |
| 52kHz fixed-frequency oscillator | Allows predictable EMI filtering and compatibility with off-the-shelf 330µH power inductors. |
| TO-263 package with exposed thermal tab | Provides θJA = 45°C/W (with 4 in² copper), enabling 1A operation without heatsink in most PCB layouts. |
| ON/OFF logic control | Supports system-level power sequencing and low-power sleep states with sub-200µA standby draw. |
Applications
| Industrial Sensor Power Supply | Embedded Controller Auxiliary Rail |
|---|---|
|
Use Scenario: Powers analog sensors and signal-conditioning circuits in factory automation nodes operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V to clean, regulated 5V for ADC references and microcontroller peripherals. Use Value: Delivers 1A with ±3% tolerance and 82% efficiency, minimizing heat rise in sealed enclosures while maintaining measurement accuracy. |
Use Scenario: Supplies 5V to FPGA configuration memory, USB PHY, and real-time clock in edge gateway devices. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable core logic voltage independent of input bus fluctuations. Use Value: Internal 5V reference and no external feedback components reduce layout area and improve long-term voltage drift stability. |
| On-Board 5V Conversion for PLC Modules | Efficient Pre-Regulator for Linear LDOs |
|
Use Scenario: Generates 5V rail on modular PLC I/O cards powered from 24V backplane. IC Role / Device Role / Timing Role: High-current buck regulator handling transient loads from relay drivers and opto-isolators. Use Value: Cycle-by-cycle current limiting prevents nuisance tripping during solenoid actuation, ensuring reliable fieldbus communication. |
Use Scenario: Feeds low-noise LDOs (e.g., for RF or audio subsystems) in mixed-signal equipment. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing dropout voltage and thermal stress on downstream linear regulators. Use Value: 82% efficiency at full load cuts input power demand by >4× versus direct 24V-to-5V linear regulation, lowering system cooling 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 TR | Same electrical specs; RoHS-compliant "WU" variant with high-melting-point solder exemption. | Identical functional behavior; selected where lead-free assembly with Pb-free exemption is mandated. | Choose LM2575-5.0WU TR for RoHS-compliant manufacturing with legacy solder process compatibility. |
| MC33063APDG | 3.3V–40V input, adjustable output, 1.5A switch, 100kHz operation - requires external feedback resistors and compensation. | Greater flexibility for non-5V rails but adds design complexity and component count. | Choose MC33063APDG only when variable output or higher switching frequency is required; not drop-in for LM2575-5.0BU TR. |
Compared with LM2575-5.0WU TR, the LM2575-5.0BU TR offers identical performance but lacks RoHS exemption documentation; compared with MC33063APDG, it trades adjustability for simplicity, requiring zero external feedback components and delivering guaranteed 5V ±3% without calibration.
Availability
LM2575-5.0BU TR is available at Aetrix Electronics and suitable for industrial sensor power supplies, embedded controller auxiliary rails, and on-board 5V conversion for PLC modules requiring stable component supply across multi-year production cycles.
Supply support for LM2575-5.0BU 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
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. It emphasized robust, easy-to-use ICs for industrial and embedded markets.
The LM2575 series was designed as a simple, high-efficiency replacement for three-terminal linear regulators - targeting cost-sensitive, thermally constrained applications like industrial controls and distributed power systems.
FAQ
What is the maximum input voltage rating for the LM2575-5.0BU TR?
The LM2575-5.0BU TR has an absolute maximum input voltage of 45V, with recommended continuous operation up to 40V. Exceeding 40V risks violating operating ratings and may trigger internal protection or reduce reliability. Always maintain input transients below 45V with appropriate clamping or filtering.
Does the LM2575-5.0BU TR require external feedback resistors to set the output voltage?
No. The LM2575-5.0BU TR is a fixed 5V output variant - its feedback pin (Pin 4) is internally connected to the 5V reference, eliminating the need for external resistors. This simplifies layout and improves output voltage stability versus adjustable versions that rely on resistor tolerance.
Can the LM2575-5.0BU TR deliver full 1A output current continuously in a TO-263 package without a heatsink?
Yes - with ≥4 in² of 2-oz copper on the PCB connected to the exposed tab, the LM2575-5.0BU TR achieves θJA = 45°C/W, allowing 1A continuous output at ambient temperatures up to +75°C. At higher ambient or with less copper, derating or heatsinking is required per thermal calculations in the datasheet.
What protection features are built into the LM2575-5.0BU TR?
The LM2575-5.0BU TR includes cycle-by-cycle current limiting (1.7–3.2A peak), thermal shutdown at 150°C junction temperature, and internal safe-start circuitry. These operate autonomously without external components, protecting against short-circuit, overload, and overheating conditions in deployed systems.
Is the ON/OFF pin of the LM2575-5.0BU TR compatible with standard 3.3V or 5V logic levels?
Yes - the ON/OFF pin accepts logic-high signals ≥2.2V (VIH min) and logic-low signals ≤1.0V (VIL max), making it directly compatible with both 3.3V and 5V CMOS/TTL outputs. Pulling the pin to GND enables regulation; pulling to ≥2.2V disables output and reduces quiescent current to <200µA.
LM2575-5.0BU TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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 TR FAQ
1.How can I place an order for LM2575-5.0BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-5.0BU 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 LM2575-5.0BU TR reliable?
The price and inventory of LM2575-5.0BU TR 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 TR is usually 5 days.
3.What payment methods are accepted for LM2575-5.0BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-5.0BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-5.0BU TR?
LM2575-5.0BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-5.0BU 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 LM2575-5.0BU TR?
For technical support, including LM2575-5.0BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-5.0BU TR requirements.
6.How does Aetrix verify that LM2575-5.0BU TR is sourced from the original manufacturer or authorized distributors?
All LM2575-5.0BU 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 LM2575-5.0BU TR meets industry standards.
7.What is the process for return or replacement of LM2575-5.0BU TR?
All LM2575-5.0BU TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-5.0BU 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 LM2575-5.0BU TR part is unused and in its original packaging.
Return procedure for LM2575-5.0BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575-5.0BU TR 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…
