LM3697YFQR datasheet by Texas Instruments

LM3697YFQR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the LM3697YFQR to minimize EMI?
  A good PCB layout for the LM3697YFQR involves keeping the input and output capacitors close to the IC, using a solid ground plane, and minimizing the length of the input and output traces. Additionally, it's recommended to use a shielded inductor and to keep the switching node (pin 5) away from sensitive analog circuits.
• How do I ensure the LM3697YFQR operates within its safe operating area (SOA)?
  To ensure the LM3697YFQR operates within its SOA, monitor the input voltage, output current, and junction temperature. Make sure the input voltage is within the recommended range (3.5V to 15V), the output current is within the maximum rating (3A), and the junction temperature is below the maximum rating (150°C).
• What is the recommended input capacitor type and value for the LM3697YFQR?
  A low-ESR ceramic capacitor with a value of 10uF to 22uF is recommended for the input capacitor. This helps to filter out high-frequency noise and ensure stable operation.
• How do I optimize the inductor selection for the LM3697YFQR?
  Choose an inductor with a high saturation current rating, low DC resistance, and a suitable inductance value (e.g., 1uH to 10uH). The inductor should also be shielded to minimize EMI. Consult the datasheet and application notes for more guidance on inductor selection.
• What is the purpose of the EN pin on the LM3697YFQR, and how do I use it?
  The EN (enable) pin is used to turn the regulator on or off. Connect the EN pin to a logic-level signal (e.g., from a microcontroller) to enable or disable the regulator. When EN is high, the regulator is enabled; when EN is low, the regulator is disabled.