Texas Instruments LM2576S-3.3
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $1.75 | $1.75 |
| 15+ | $1.69 | $25.35 |
| 25+ | $1.66 | $41.50 |
| 50+ | $1.56 | $78.00 |
| 100+ | $1.38 | $138.00 |
| N+ | $0.28 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | SIMPLE SWITCHER® |
| Packaging | Tube | |
| 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) | 3.3V |
| 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 |
| Package / Case | TO-263-6, D2PAK (5 Leads + Tab), TO-263BA |
| Supplier Device Package | TO-263 (DDPAK-5) |
| ROHS |  |
The LM2576S-3.3 from UMW is a simple, high-efficiency step-down (buck) switching regulator. It accepts a wide input voltage from 4V to 40V and provides a fixed 3.3V output with up to 3A of load current. The 52kHz fixed-frequency oscillator simplifies filtering and reduces external component count. Its TO-263 (D2PAK) package offers excellent thermal performance. This regulator is ideal for applications requiring a rugged, low-cost 3.3V supply from higher voltage sources.
- High Output Current (3A): Powers multiple digital loads without additional drivers.
- Wide Input Range (4V-40V): Works with 5V, 12V, 24V, and 28V rails.
- Fixed 3.3V Output: No external resistor divider needed, simplifying design.
- 52kHz Fixed Frequency: Predictable EMI and easy filter design.
- Robust TO-263 Package: Excellent heat dissipation for continuous operation.
Simple 3.3V Logic Supplies
With a fixed 3.3V output and 3A capability, it is ideal for powering microcontrollers, FPGAs, and digital logic from a 12V or 24V input. The 52kHz frequency allows for small, low-cost inductors.
Battery Chargers
The LM2576S-3.3 can be configured as a constant-current/constant-voltage charger for 3.3V lithium or NiMH batteries. Its high efficiency reduces heat in portable chargers.
Industrial Control Panels
In 24V industrial systems, this regulator provides a stable 3.3V rail for sensors, PLCs, and HMI displays. The wide input range tolerates voltage fluctuations on the bus.
Point-of-Load Regulation
Use it as a local 3.3V supply from a higher voltage bus (e.g., 5V or 12V) to power mixed-signal circuits. The 3A output supports multiple ICs.
Automotive Aftermarket
For 12V automotive accessories, it steps down to 3.3V for dashcams, GPS trackers, or OBD-II devices. The 40V input rating handles load dump transients.
White Goods and Appliances
In washing machines or refrigerators, it powers control boards from a 12V or 24V rail. The simple design and robust TO-263 package ensure long-term reliability.
- Q: What type of converter is the LM2576S-3.3?
- A: It is a step-down (Buck) switching regulator.
- Q: What is the input voltage range?
- A: The input voltage range is from 4V to 40V.
- Q: What is the fixed output voltage?
- A: The output voltage is fixed at 3.3V.
- Q: What is the maximum load current?
- A: It can deliver up to 3A of load current.
- Q: What is the switching frequency?
- A: The switching frequency is fixed at 52kHz.
- Q: What package is available?
- A: It is available in a TO-263-6 (D2PAK) package.
LM2576S-3.3.pdf
- Q: What type of converter is the LM2576S-3.3?
- A: It is a step-down (Buck) switching regulator.
- Q: What is the input voltage range?
- A: The input voltage range is from 4V to 40V.
- Q: What is the fixed output voltage?
- A: The output voltage is fixed at 3.3V.
- Q: What is the maximum load current?
- A: It can deliver up to 3A of load current.
- Q: What is the switching frequency?
- A: The switching frequency is fixed at 52kHz.
- Q: What package is available?
- A: It is available in a TO-263-6 (D2PAK) package.
