Texas Instruments provides a recommended PCB layout in the LM94022BIMGX datasheet, but it's essential to follow additional guidelines for optimal thermal performance. Ensure a solid ground plane, use thermal vias, and keep the device away from heat sources. A 4-layer PCB with a dedicated thermal layer is recommended.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. A general guideline is to use a capacitor with a capacitance value between 10uF to 22uF, and an ESR (Equivalent Series Resistance) of less than 1 ohm. TI recommends using a capacitor with a voltage rating of at least 2x the output voltage.
Although the datasheet specifies a maximum input voltage of 5.5V, it's essential to consider the absolute maximum rating of 6V. Exceeding this voltage can cause permanent damage to the device. Ensure that the input voltage is within the recommended operating range to maintain reliability and performance.
The LM94022BIMGX does not have built-in overvoltage protection. To implement OVP, you can use an external voltage supervisor or a dedicated OVP IC. Connect the OVP circuitry to the input voltage rail and configure it to shut down the device or trigger an alert when the input voltage exceeds a predetermined threshold.
The recommended input capacitor value is 1uF to 10uF, with a voltage rating of at least 2x the input voltage. Use a ceramic or film capacitor with low ESR and high ripple current capability. Avoid using electrolytic capacitors due to their high ESR and limited lifespan.
