Maxim provides a recommended PCB layout in the application note AN4341, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize noise.
The LMX393HAKA-T requires a stable power supply with adequate decoupling capacitors to ensure proper operation. A 10uF ceramic capacitor and a 1uF film capacitor in parallel, placed close to the device, are recommended for decoupling. Additionally, a low-ESR capacitor (e.g., 10uF) should be placed on the output pin to filter the output voltage.
The LMX393HAKA-T can deliver up to 3A of output current, but this is dependent on the input voltage, output voltage, and ambient temperature. It's essential to consult the datasheet and perform thermal calculations to ensure the device operates within its safe operating area.
The output voltage of the LMX393HAKA-T can be adjusted using the feedback resistors (R1 and R2) connected between the output pin and the feedback pin. The output voltage is determined by the ratio of R1 to R2, according to the formula: Vout = 1.25V x (1 + R2/R1).
The enable pin (EN) is used to turn the device on or off. When EN is high, the device is enabled, and when EN is low, the device is disabled, and the output is turned off. This pin can be used to implement power sequencing or to shut down the device when not in use.
LMX393HAKA-T datasheet
by Maxim Integrated Products
