MAX823LEXK+T datasheet by Maxim Integrated Products

MAX823LEXK+T Frequently Asked Questions (FAQs)

• What is the recommended layout and placement for the MAX823LEXK+T to ensure optimal performance?
  To ensure optimal performance, it's recommended to follow a star-grounding layout, keep the device away from high-current paths, and use a solid ground plane. Additionally, place the input and output capacitors as close to the device as possible, and use short, wide traces to minimize inductance and resistance.
• How do I handle the power-up sequence for the MAX823LEXK+T to avoid voltage regulator latch-up?
  To avoid latch-up, ensure that the input voltage (VIN) is applied before the enable input (EN) is asserted. A power-up sequence of VIN > EN is recommended. Additionally, add a delay of at least 10ms between applying VIN and asserting EN to allow the internal voltage regulator to stabilize.
• What is the maximum input voltage that the MAX823LEXK+T can handle without damage?
  Although the datasheet specifies a maximum input voltage of 5.5V, the device can handle up to 6.5V for short durations (less than 100ms) without damage. However, it's recommended to operate within the specified range to ensure reliable operation and prevent long-term damage.
• How do I calculate the output voltage of the MAX823LEXK+T, and what are the tolerances?
  The output voltage (VOUT) can be calculated using the formula: VOUT = (VREF x (1 + R1/R2)), where VREF is the internal reference voltage (1.25V), and R1 and R2 are the external resistors. The output voltage tolerance is typically ±2% over the operating temperature range.
• What is the recommended input capacitor value and type for the MAX823LEXK+T?
  A low-ESR ceramic capacitor with a value of 1μF to 10μF is recommended for the input capacitor (CIN). A higher value can help improve noise rejection and transient response, but may increase the startup time.