LM4140ACM-2.0/NOPB datasheet by Texas Instruments

LM4140ACM-2.0/NOPB Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the LM4140ACM-2.0/NOPB to minimize noise and ensure stability?
  A good PCB layout for the LM4140ACM-2.0/NOPB involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing trace lengths and loops. TI provides a recommended PCB layout in the datasheet and application notes.
• How do I ensure the LM4140ACM-2.0/NOPB is stable and doesn't oscillate?
  To ensure stability, follow the recommended PCB layout, use a minimum output capacitance of 10uF, and ensure the output voltage is within the specified range. Additionally, avoid using long output cables and minimize the distance between the output capacitor and the load.
• What is the maximum input voltage that the LM4140ACM-2.0/NOPB can handle?
  The LM4140ACM-2.0/NOPB has an absolute maximum input voltage rating of 7V. Exceeding this voltage can damage the device. It's recommended to operate the device within the specified input voltage range of 2.7V to 5.5V.
• Can I use the LM4140ACM-2.0/NOPB in a high-temperature environment?
  The LM4140ACM-2.0/NOPB is rated for operation up to 125°C. However, the device's performance and reliability may degrade at high temperatures. It's recommended to derate the device's output current and voltage according to the temperature derating curve in the datasheet.
• How do I calculate the output voltage of the LM4140ACM-2.0/NOPB?
  The output voltage of the LM4140ACM-2.0/NOPB is determined by the resistor divider network connected to the FB pin. The output voltage can be calculated using the formula: Vout = 2.0V x (1 + R1/R2), where R1 and R2 are the resistors in the divider network.