Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | Fixed 5 V buck regulator |
| Output current | 3 A |
| Input range | 8 V to 40 V for 5 V regulation specification |
| Switching frequency | 52 kHz |
| Output tolerance | 4.75 V to 5.25 V over extended conditions |
| Package | 5-lead TO-263 |
| Temperature range | -40°C to +125°C |
| Family status | In Production |
Product Overview
The LM2576-5.0WU is Microchip’s 5 V fixed-output LM2576 buck regulator in the 5-lead TO-263 package. It provides up to 3 A regulated output using a low-frequency 52 kHz architecture and an external inductor, catch diode and capacitors.
The WU suffix is the TO-263 version. It should not be confused with the WT TO-220 variant or the WU-TR reel option.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Fixed output | 5.0 V |
| Rated output current | 3 A |
| Input range for 5 V spec | 8–40 V |
| Output at 25°C reference | 4.8–5.2 V |
| Extended output range | 4.75–5.25 V |
| Switching frequency | 52 kHz |
| Typical efficiency | 75% at VIN = 12 V, IOUT = 3 A |
| Junction max | 150°C |
| Operating temperature | -40°C to +125°C |
| Package | TO-263-5 |
Design Considerations
The regulator requires the recommended Schottky catch diode, inductor and output capacitor ESR range for stable operation. Modern low-ESR capacitors should be checked against the datasheet rather than substituted blindly.
At large VIN−VOUT and heavy load, package dissipation can become substantial despite switching operation. Use copper spreading and thermal calculations for the TO-263 pad.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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