HR1001CGS-Z - Monolithic Power Systems (MPS)

HR1001CGS-Z Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  Monolithic Power Systems recommends a 2-layer or 4-layer PCB with a solid ground plane and a thermal relief pattern under the IC to improve thermal dissipation. A minimum of 2 oz copper thickness is recommended for the top and bottom layers.
• How do I ensure reliable start-up and operation with a high-impedance input source?
  To ensure reliable start-up and operation with a high-impedance input source, add a 1-2uF ceramic capacitor between the VIN pin and GND pin to filter out noise and improve input impedance. Additionally, ensure the input voltage rises slowly (e.g., 10-20ms) to prevent false triggering of the UVLO.
• What is the maximum allowed capacitance on the output pin?
  The maximum allowed capacitance on the output pin is 10uF. Exceeding this value may cause instability or oscillations in the regulator. If a larger output capacitance is required, consider adding a series resistor (e.g., 1-2 ohms) to dampen the output and prevent oscillations.
• How do I adjust the output voltage accuracy to meet specific requirements?
  The output voltage accuracy can be adjusted by trimming the resistor divider network (R1 and R2) connected to the FB pin. A 1% tolerance resistor is recommended for R1 and R2 to ensure accurate output voltage regulation.
• What is the recommended input capacitor type and value for optimal performance?
  A low-ESR ceramic capacitor (e.g., X5R or X7R) with a value of 4.7uF to 10uF is recommended for the input capacitor. This helps to filter out input noise and improve the regulator's power supply rejection ratio (PSRR).