Details
BUY LM2576SX-ADJ https://www.utsource.net/itm/p/1331025.html
0.5mm Pitch DIL Vertical SMT Female Assembly, 2.5mm height, location pegs, hold-down tabs, tin, 20+20-way, Tape & Reel packing
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions/Notes |
|---|---|---|---|---|---|---|
| Input Voltage | VIN | 4.5 | - | 40 | V | Continuous input voltage range |
| Output Voltage | VOUT | 1.23 | - | 37 | V | Adjustable output voltage range |
| Switching Frequency | fSW | - | 52 | - | kHz | Internal oscillator frequency |
| Output Current | IOUT | - | 3 | - | A | Maximum continuous output current |
| Efficiency | η | - | 80 | - | % | Typical efficiency at full load, varies with VIN and VOUT |
| Dropout Voltage | VDROPOUT | - | 1.2 | - | V | At full load |
| Quiescent Current | IQ | - | 5 | - | mA | Shutdown mode |
| Load Regulation | ΔVOUT/ΔILOAD | - | 0.1 | - | % | From 0 to full load |
| Line Regulation | ΔVOUT/ΔVIN | - | 0.01 | - | %/V | Over the specified input voltage range |
| Ripple Rejection | RR | - | 60 | - | dB | At 1kHz |
| Operating Temperature | TOPR | -40 | - | 125 | °C | Junction temperature range |
| Storage Temperature | TSTG | -65 | - | 150 | °C | Temperature range for storage and handling |
Instructions:
Input Capacitor Selection: Choose an input capacitor with a low ESR (Equivalent Series Resistance) and sufficient ripple current rating. A ceramic or tantalum capacitor is recommended.
Output Capacitor Selection: The output capacitor should have a low ESR to minimize output ripple. For best performance, use a tantalum or ceramic capacitor with an ESR between 0.1Ω and 2Ω.
Inductor Selection: Select an inductor with a saturation current higher than the maximum output current. An inductance value of 100μH to 470μH is typically used.
Feedback Resistor Network: To set the output voltage, connect two resistors (R1 and R2) from the ADJ pin to ground and VOUT respectively. Use the formula ( V_ = 1.23 left(1 + fracright) ).
Bypass Capacitors: Place bypass capacitors close to the power supply pins to ensure stable operation. A 0.1μF ceramic capacitor is generally sufficient.
PCB Layout Considerations: Keep the traces short and wide, especially for high-current paths. Ensure good thermal management by providing adequate copper area for heat dissipation.
Thermal Management: If operating near the maximum load, consider adding a heatsink or improving airflow to maintain the junction temperature within the specified range.
Startup Characteristics: The device starts up when the input voltage exceeds the UVLO threshold. Ensure that the input voltage rises slowly to avoid inrush current issues.
Short-Circuit Protection: The LM2576SX-ADJ has built-in overcurrent protection which limits the output current during a short circuit. The device will automatically restart after the fault condition is removed.
Shutdown Mode: To enter shutdown mode, pull the EN/UVLO pin below 1.3V. In this mode, the quiescent current drops to approximately 5mA.
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