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Specifications
SKU: 12398988
| Parameter | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage (VIN) | Operating input voltage range | 4.5 | - | 40 | V |
| Output Voltage (VOUT) | Fixed output voltage | - | 5.0 | - | V |
| Output Current (IOUT) | Maximum continuous output current | - | 3.0 | - | A |
| Switching Frequency (fSW) | Switching frequency | - | 52 | - | kHz |
| Efficiency (η) | Typical efficiency at nominal conditions | - | 84 | - | % |
| Dropout Voltage (VDROP) | Dropout voltage at full load | - | 1.0 | - | V |
| Quiescent Current (IQ) | Quiescent current | - | 5 | - | mA |
| Load Regulation | Change in output voltage with load current | - | 0.5 | - | % |
| Line Regulation | Change in output voltage with input voltage | - | 0.05 | - | % |
| Ripple Rejection | Attenuation of input ripple at the output | - | 60 | - | dB |
| Operating Temperature (Toper) | Operating temperature range | -40 | - | 125 | °C |
| Storage Temperature (Tstg) | Storage temperature range | -65 | - | 150 | °C |
Instructions for Using the LM2574N-5.0/NOPB
Input Capacitor (CIN):
- Use a 10 μF to 100 μF electrolytic capacitor to filter the input voltage.
- Place the capacitor close to the input pin to minimize noise.
Output Capacitor (COUT):
- Use a 100 μF to 1000 μF electrolytic capacitor to stabilize the output voltage.
- For better transient response, add a 0.1 μF ceramic capacitor in parallel.
Inductor (L):
- Select an inductor value based on the desired output current and switching frequency.
- Typical values range from 100 μH to 1000 μH.
- Ensure the inductor can handle the maximum output current without saturating.
Feedback Resistor (R1 and R2):
- The LM2574N-5.0/NOPB has a fixed output voltage of 5.0 V, so no external resistors are required for feedback.
- If a different output voltage is needed, refer to the datasheet for resistor values.
Schottky Diode (D):
- Use a Schottky diode with a reverse voltage rating higher than the maximum input voltage.
- Ensure the diode can handle the peak current, which is typically 1.5 times the output current.
Thermal Considerations:
- Ensure adequate heat dissipation if operating at high output currents or in high ambient temperatures.
- Use a heatsink if necessary to keep the junction temperature within the specified limits.
Layout Considerations:
- Keep the ground plane solid and wide to reduce inductance and improve stability.
- Route input and output capacitors directly to the respective pins to minimize parasitic inductance.
Testing:
- Verify the output voltage and current using a multimeter.
- Check the ripple and noise at the output using an oscilloscope.
- Test the circuit under various load conditions to ensure stability and performance.
Storage and Handling:
- Store the device in a dry environment to prevent moisture damage.
- Handle with care to avoid static discharge, which can damage the device.
For detailed specifications and additional information, refer to the LM2574N-5.0/NOPB datasheet provided by the manufacturer.
(For reference only)Inquiry - LM2574N-5.0/NOPB
