My Inquiry
My Account
Microchip Technology LM2576-5.0WT
- Part No.:
- LM2576-5.0WT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
LM2576-5.0WT.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:375
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2576-5.0WT from Micrel is a fixed-output 5.0V, 3A step-down (buck) switching regulator in TO-220-5 package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2576-5.0WT datasheet, LM2576-5.0WT pinout, LM2576-5.0WT application, or LM2576-5.0WT equivalent, key selection considerations include input voltage range (4–40V), guaranteed 3A output current, 82% typical efficiency at 12VIN/5VOUT/3A, and ON/OFF control with <200µA standby current.
Technical Context
The LM2576-5.0WT integrates a 3A NPN switch, 1.23V bandgap reference, error amplifier, 52kHz oscillator, and thermal/current protection circuitry. Its fixed 5.0V output eliminates external feedback resistors, simplifying design versus adjustable variants.
It operates in continuous conduction mode with internal frequency compensation and requires only four external components: input capacitor, output capacitor, catch diode, and inductor. The ON/OFF pin enables logic-level shutdown with VIH ≥ 2.2V and VIL ≤ 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over –40°C to +85°C, 0.5–3A load, 8–40V input - ensures stable rail for microcontrollers and sensors without trimming. |
| Max Output Current | 3A DC - supports mid-power applications like motor drivers or FPGA I/O banks without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial sources including 12V/24V battery systems and unregulated rectified AC. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, standard 330µH inductors and reduces EMI filtering complexity vs. MHz-range regulators. |
| Efficiency | 82% typical at VIN=12V, VOUT=5V, IOUT=3A - cuts heat sink requirements versus linear regulators and improves system thermal margin. |
| 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 overload, short-circuit, or ambient temperature excursions. |
Pinout & Package
LM2576-5.0WT uses the 5-lead TO-220-5 package with exposed tab (electrically connected to Pin 3/GND). Mounting requires thermal interface to heatsink for >1.5A continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply connection | Accepts 4–40V DC; must be decoupled with ≥100µF electrolytic capacitor near pin to suppress switching transients. |
| 2 - OUTPUT | Switched output node | Drives external catch diode and inductor; peak current up to 5.8A; connects to LC filter output. |
| 3 - GND | Power and signal ground reference | Common return for input cap, output cap, feedback network (not used in fixed version), and heatsink mounting surface. |
| 4 - FEEDBACK | Regulation sense input | Internally tied to 5.0V output divider; no external connection required for LM2576-5.0WT - distinguishes it from adjustable variants. |
| 5 - ON/OFF | Logic-controlled enable/disable | Active-low disable: ≤1.0V turns off regulator; ≥2.2V enables operation; pulls <30µA when enabled. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external resistor divider, reducing BOM count, layout area, and calibration drift risk. |
| Integrated 3A switch | Removes need for external MOSFET and driver, lowering solution cost and board space versus controller-based designs. |
| 52kHz fixed-frequency oscillator | Enables predictable EMI spectrum and compatibility with low-cost, widely available off-the-shelf inductors (e.g., 330µH). |
| Thermal shutdown + current limit | Provides autonomous fault recovery without external monitoring circuitry - critical for unattended industrial equipment. |
| ON/OFF logic control | Supports system-level power sequencing and low-power states using standard 3.3V/5V GPIO, not requiring level shifters. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
|
Use Scenario: Converting 24V DC bus to stable 5V for PLC I/O modules operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/3A to digital logic, ADC references, and communication interfaces. Use Value: Replaces inefficient 7805-style linear regulators, eliminating mandatory heatsinks and enabling compact DIN-rail mounted enclosures. |
Use Scenario: On-board power conversion for ARM Cortex-M4-based edge sensor nodes powered by 12V PoE injectors. IC Role / Device Role / Timing Role: Main 5V supply for MCU, Wi-Fi module, and analog front-end; ON/OFF pin synchronized to MCU sleep/wake cycles. Use Value: 82% efficiency and <200µA standby current extend battery backup runtime during grid outages without sacrificing processing capability. |
| Test Equipment Power Rail | Motor Drive Logic Supply |
|
Use Scenario: Generating clean 5V for precision DACs and op-amps inside portable multimeters and calibrators. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 5V source with minimal ripple (<100mV pk-pk) under dynamic load steps. Use Value: ±3% output tolerance and excellent load regulation ensure measurement accuracy across varying battery charge states. |
Use Scenario: Providing isolated 5V logic supply for gate drivers in 24V BLDC motor controllers subject to high dv/dt noise. IC Role / Device Role / Timing Role: Robust 5V rail tolerant to input transients up to 45V, with fast thermal shutdown preventing latch-up during MOSFET shoot-through faults. Use Value: Integrated protection avoids cascading failures in high-reliability motion control systems where field repair is costly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-5.0T | Same electrical specs and TO-220-5 package; "T" suffix denotes standard lead form (non-staggered), while "WT" indicates staggered leads for improved creepage clearance. | No functional difference in circuit operation; WT variant preferred in high-voltage isolation or safety-critical layouts per IEC 61000-4-5. | Select LM2576-5.0WT when PCB layout requires enhanced creepage between VIN and GND pins; otherwise LM2576-5.0T is functionally identical. |
| MP1584EN-LF-Z | Higher 1.5MHz switching frequency, smaller 2A output, different pinout (SOIC-8), no ON/OFF pin - requires redesign of magnetics and layout. | Better suited for space-constrained consumer devices; lacks thermal shutdown flag and has lower max input (28V). | Choose MP1584EN-LF-Z only if board area is critical and 2A output suffices; LM2576-5.0WT remains optimal for industrial 3A, 40V-input, and robustness requirements. |
Compared with LM2576-5.0T, the LM2576-5.0WT offers identical regulation performance but with staggered leads for higher isolation compliance; versus MP1584EN-LF-Z, it trades higher frequency for proven ruggedness, wider input range, and built-in enable/shutdown functionality.
Availability
LM2576-5.0WT is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, test equipment power rails, and motor drive logic supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2576-5.0WT 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, timing, and networking ICs before its acquisition by Microchip Technology in 2015. Its products emphasized reliability and ease-of-use for industrial applications.
The LM2576 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators, targeting cost-sensitive, thermally constrained industrial and embedded power systems requiring simple, robust DC-DC conversion.
FAQ
What is the maximum input voltage rating for the LM2576-5.0WT?
The LM2576-5.0WT has an absolute maximum input voltage rating of 45V, with recommended continuous operation up to 40V. Exceeding 40V risks exceeding thermal limits or triggering overvoltage stress on internal junctions, even with proper heatsinking. Always observe the 40V operational limit specified in the datasheet for reliable long-term use of the LM2576-5.0WT.
Does the LM2576-5.0WT require external feedback resistors?
No, the LM2576-5.0WT does not require external feedback resistors. As a fixed-output variant, its internal resistor divider sets the regulated output to 5.0V. Pin 4 (FEEDBACK) is internally connected and must remain unconnected in the LM2576-5.0WT - unlike adjustable versions such as LM2576-ADJ, which rely on external R1/R2 networks.
Can the LM2576-5.0WT be used in a negative-output (inverting) configuration?
Yes, the LM2576-5.0WT can be configured as a negative-output buck-boost converter by repositioning the inductor and diode, as documented in Micrel Application Note AN-11. This yields a regulated –5V output from a positive input, preserving the LM2576-5.0WT's 3A capability and protection features, though efficiency drops ~5–8% versus standard buck mode.
What thermal management is required for full 3A output from the LM2576-5.0WT?
At 3A output with 12V input, the LM2576-5.0WT dissipates ~2.1W. With θJA = 65°C/W (no heatsink), junction temperature rise exceeds safe limits. A minimum 1.5" × 1.5" copper pour plus a 1°C/W heatsink is required to maintain TJ < 125°C. Always verify thermal performance using actual board layout and ambient conditions for the LM2576-5.0WT.
Is the LM2576-5.0WT RoHS compliant?
Yes, the LM2576-5.0WT is RoHS compliant per the manufacturer's ordering information, with exemption for "hot-melting solder" as noted in the datasheet revision M9999-082605-B. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, meeting EU Directive 2011/65/EU requirements for the LM2576-5.0WT.
LM2576-5.0WT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 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
LM2576-5.0WT FAQ
1.How can I place an order for LM2576-5.0WT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576-5.0WT 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 LM2576-5.0WT reliable?
The price and inventory of LM2576-5.0WT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576-5.0WT is usually 5 days.
3.What payment methods are accepted for LM2576-5.0WT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576-5.0WT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576-5.0WT?
LM2576-5.0WT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576-5.0WT 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 LM2576-5.0WT?
For technical support, including LM2576-5.0WT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576-5.0WT requirements.
6.How does Aetrix verify that LM2576-5.0WT is sourced from the original manufacturer or authorized distributors?
All LM2576-5.0WT 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 LM2576-5.0WT meets industry standards.
7.What is the process for return or replacement of LM2576-5.0WT?
All LM2576-5.0WT units undergo pre-shipment inspection (PSI). If there is an issue with LM2576-5.0WT, 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 LM2576-5.0WT part is unused and in its original packaging.
Return procedure for LM2576-5.0WT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576-5.0WT 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…
