The MAX1558ETB requires careful layout and placement to minimize noise and ensure optimal performance. It is recommended to place the device close to the battery, use a solid ground plane, and keep the input and output traces short and separate. Additionally, it is recommended to use a 10uF ceramic capacitor at the input and a 1uF ceramic capacitor at the output to filter out noise and ripple.
The input capacitor selection depends on the input voltage range, output voltage, and desired ripple rejection. A general rule of thumb is to choose a capacitor with a value between 1uF to 10uF, with a voltage rating at least 1.5 times the maximum input voltage. X5R or X7R ceramic capacitors are recommended for their low ESR and high ripple current capability.
The MAX1558ETB can handle input voltages up to 28V, but it is recommended to operate within the specified input voltage range of 4.5V to 16V for optimal performance and reliability. Exceeding the maximum input voltage can cause damage to the device or affect its performance.
To ensure stability, it is recommended to follow the layout and placement guidelines, use the recommended input and output capacitors, and ensure that the input voltage is within the specified range. Additionally, it is recommended to add a 1kΩ to 10kΩ resistor in series with the output capacitor to prevent oscillation.
The typical dropout voltage of the MAX1558ETB is around 1.2V to 1.5V, depending on the output current and input voltage. This means that the output voltage will be around 1.2V to 1.5V lower than the input voltage when the device is operating in dropout mode.
MAX1558ETB datasheet
by Maxim Integrated Products
