My Inquiry
My Account
Microchip Technology LM2576-5.0WU
- Part No.:
- LM2576-5.0WU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576-5.0WU.pdf
- Description:
- IC REG BUCK 5V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2576-5.0WU from Micrel, Inc. is a fixed-output 5.0V, 3A step-down (buck) switching regulator in TO-263-5 package. It features 52kHz fixed-frequency operation, ±3% output voltage tolerance over line and load, internal current limiting, thermal shutdown, and <200µA standby current. It replaces linear regulators in medium-power DC-DC conversion for industrial power supplies.
For engineers reviewing the LM2576-5.0WU datasheet, LM2576-5.0WU pinout, LM2576-5.0WU application, or LM2576-5.0WU equivalent, key selection criteria include input voltage range (4–40V), guaranteed 3A output capability, thermal performance in TO-263, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576-5.0WU integrates a 52kHz oscillator, error amplifier, PWM comparator, 3A NPN switch, and thermal/current protection circuitry. Its feedback loop references an internal 1.23V bandgap, with fixed 5.0V output set by internal resistor divider - eliminating external feedback components.
It operates in continuous conduction mode with cycle-by-cycle current limiting and automatic thermal shutdown at ~150°C junction temperature. The device requires only four external components: input capacitor, output capacitor, catch diode, and power inductor - all standardized and widely available.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over full operating range (4.80–5.20V min/max) |
| Max Output Current | 3A continuous, with internal current limit protecting against overload |
| Input Voltage Range | 4V to 40V DC - supports wide-range industrial inputs including 12V/24V/36V rails |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, high-current standard inductors (e.g., 330µH) |
| Efficiency | 82% typical at VIN=12V, VOUT=5V, IOUT=3A - reduces heat sink requirements vs. linear regulators |
| Standby Current | <200µA when ON/OFF pin = 5V - enables low-power shutdown mode |
| Thermal Shutdown | Activates at ~150°C junction temperature - prevents damage under sustained overload or poor heatsinking |
Pinout & Package
LM2576-5.0WU uses the 5-lead TO-263 (D²PAK) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 3 (GND) and the tab are electrically connected to internal ground and serve as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – VIN | Power Input | Accepts unregulated DC input (4–40V); connects to input capacitor and inductor |
| 2 – OUTPUT | Switch Node | Drives inductor and catch diode; carries high di/dt switching current |
| 3 – GND | Ground Reference | Main power and signal ground; tied to exposed thermal pad for thermal conduction |
| 4 – FEEDBACK | Internal Fixed Reference | Internally connected to 5.0V divider - no external connection required |
| 5 – ON/OFF | Enable Control | Logic-level shutdown: ≤0.8V = ON, ≥2.2V = OFF; draws <30µA in OFF state |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V Output | Eliminates external feedback resistors - simplifies layout and improves stability |
| Integrated 3A Switch | Reduces BOM count and eliminates need for external MOSFET driver or discrete transistor |
| 52kHz Oscillator | Enables use of low-cost, high-current off-the-shelf inductors (e.g., AIE 415-0926) |
| Thermal + Current Protection | Prevents failure during short-circuit, overload, or inadequate heatsinking without external circuitry |
| TO-263 Thermal Pad | Low θJA (45°C/W with 1 in² copper) - supports 3A operation without external heatsink in many cases |
Applications
| Industrial Power Supply | Automotive Subsystem |
|---|---|
Use Scenario: Converting 24V vehicle battery to stable 5V for microcontroller and sensor modules. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V rail with transient immunity and thermal resilience. Use Value: Delivers 3A continuously at >80% efficiency, reducing thermal stress and enabling compact PCB layout without forced air cooling. | Use Scenario: On-card DC-DC conversion in programmable logic controllers (PLCs) with 12–36V input range. IC Role / Device Role / Timing Role: Fixed-output step-down regulator powering FPGA I/O banks and communication interfaces. Use Value: ±3% output accuracy ensures reliable digital logic operation; 52kHz frequency avoids EMI-sensitive bands while supporting cost-effective magnetics. |
| Embedded System Power | Test & Measurement Equipment |
Use Scenario: Local 5V supply for ARM-based edge computing modules powered from 12V wall adapters. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding LDOs for noise-sensitive analog sections. Use Value: Reduces heat generation vs. linear solutions - critical for sealed enclosures; ON/OFF pin enables system-level power sequencing. | Use Scenario: Benchtop instrument requiring clean, stable 5V for ADC reference and digital control logic. IC Role / Device Role / Timing Role: Main 5V power source with low ripple and fast load transient response (±100mV typical). Use Value: Internal compensation and fixed frequency ensure consistent regulation across varying loads - simplifying compliance testing. |
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; TO-220-5 through-hole package with higher θJA (65°C/W, no thermal pad) | Requires external heatsink for 3A continuous operation; less suitable for space-constrained SMT designs | Select LM2576-5.0T only when through-hole assembly or manual prototyping is required. |
| LM2596-5.0 | Higher 150kHz switching frequency, lower 3A max current, different pinout, no ON/OFF pin | Lacks enable control and has tighter input voltage limits (4.5–40V); requires different inductor value (typically 33–100µH) | Choose LM2596-5.0 only if higher frequency allows smaller magnetics and enable function is not needed. |
Compared with LM2576-5.0T and LM2596-5.0, the LM2576-5.0WU uniquely combines SMT-compatible thermal performance (TO-263), integrated enable functionality, and proven 52kHz design maturity - making it optimal for production-grade industrial power rails where reliability and thermal margin are critical.
Availability
LM2576-5.0WU is available at Aetrix Electronics and suitable for industrial power supplies, automotive subsystems, and embedded system power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2576-5.0WU 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 RF ICs before its acquisition by Microchip Technology in 2015. Known for robust, application-ready power solutions.
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 applications with minimal external component count.
FAQ
What is the maximum input voltage rating for the LM2576-5.0WU?
The LM2576-5.0WU has an absolute maximum input voltage of 45V, with recommended operating range from 4V to 40V DC. Exceeding 40V may reduce reliability or trigger overvoltage stress; the device includes no input overvoltage protection, so external clamping or filtering must be added if transients exceed 45V. Always verify input ripple and surge margins in final design.
Does the LM2576-5.0WU require external feedback resistors?
No, the LM2576-5.0WU does not require external feedback resistors. It is a fixed-output variant with internal resistor divider setting the output to 5.0V - pin 4 (FEEDBACK) is internally connected and must remain unconnected. This eliminates tuning errors and improves regulation stability compared to adjustable versions like LM2576-ADJ.
Can the LM2576-5.0WU be used in negative-output configurations?
Yes, the LM2576-5.0WU can be configured as a positive-to-negative inverting buck-boost converter per Micrel Application Note AN-11. In this topology, the device regulates –5.0V output using standard external components. However, the output polarity is inverted, and efficiency drops ~5–10% versus standard buck operation due to diode conduction losses.
What thermal performance can be expected from the LM2576-5.0WU in TO-263 package?
With 1 in² of 2-oz copper on the PCB connected to the exposed thermal pad, the LM2576-5.0WU achieves θJA ≈ 45°C/W. At 3A output and 12V input, junction temperature rise is ~110°C above ambient - requiring ambient ≤40°C for safe operation. For higher ambient or continuous 3A loads, adding a small external heatsink to the tab is recommended.
Is the LM2576-5.0WU RoHS compliant?
Yes, the LM2576-5.0WU is RoHS compliant per the manufacturer's ordering information, with exemption for "hot-melting solder" as noted in the datasheet. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for environmentally regulated industrial and commercial end equipment.
LM2576-5.0WU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
LM2576-5.0WU FAQ
1.How can I place an order for LM2576-5.0WU through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576-5.0WU 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 LM2576-5.0WU reliable?
The price and inventory of LM2576-5.0WU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576-5.0WU is usually 5 days.
3.What payment methods are accepted for LM2576-5.0WU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576-5.0WU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576-5.0WU?
LM2576-5.0WU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576-5.0WU 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 LM2576-5.0WU?
For technical support, including LM2576-5.0WU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576-5.0WU requirements.
6.How does Aetrix verify that LM2576-5.0WU is sourced from the original manufacturer or authorized distributors?
All LM2576-5.0WU 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 LM2576-5.0WU meets industry standards.
7.What is the process for return or replacement of LM2576-5.0WU?
All LM2576-5.0WU units undergo pre-shipment inspection (PSI). If there is an issue with LM2576-5.0WU, 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 LM2576-5.0WU part is unused and in its original packaging.
Return procedure for LM2576-5.0WU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576-5.0WU 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…
