The recommended layout and placement for the MAX6639ATE+ involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces to reduce noise and EMI.
To ensure stability, make sure to follow the recommended component values and layout guidelines, and add a 10nF capacitor between the VCC and GND pins to filter out noise. Also, ensure that the output capacitor is properly sized and placed close to the device.
The MAX6639ATE+ can handle input voltages up to 5.5V, but it's recommended to keep the input voltage below 5V to ensure reliable operation and to prevent damage to the device.
The output voltage of the MAX6639ATE+ can be adjusted by changing the ratio of the resistors R1 and R2 in the feedback network. A higher ratio will result in a higher output voltage, and a lower ratio will result in a lower output voltage.
The MAX6639ATE+ can deliver up to 1.5A of output current, but the actual output current capability may be limited by the input voltage, output voltage, and the thermal performance of the device.