The MAX872CPA 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 separate to minimize noise coupling. Additionally, it is recommended to use a 10uF ceramic capacitor at the input and a 22uF ceramic capacitor at the output to filter out noise and ripple.
The MAX872CPA has a adjustable output voltage range of 2.5V to 5.5V. To select the correct output voltage, consider the voltage requirements of your load, the input voltage range, and the desired output voltage tolerance. You can use the feedback resistors (R1 and R2) to set the output voltage according to the formula: VOUT = 1.25V x (1 + R2/R1).
The MAX872CPA has a maximum input voltage rating of 6.5V. However, it is recommended to operate the device within the recommended input voltage range of 2.5V to 5.5V to ensure optimal performance and reliability. Exceeding the maximum input voltage rating may damage the device or affect its performance.
To ensure the MAX872CPA is stable and does not oscillate, it is recommended to use a minimum output capacitance of 22uF, a minimum input capacitance of 10uF, and to place the output capacitor close to the device. Additionally, it is recommended to use a low-ESR output capacitor and to avoid using tantalum or electrolytic capacitors, which can cause oscillation.
The typical startup time for the MAX872CPA is around 100ms to 200ms, depending on the input voltage and output capacitance. However, this time can vary depending on the specific application and operating conditions.
MAX872CPA datasheet
by Maxim Integrated Products
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