Texas Instruments recommends a 2-layer or 4-layer PCB with a solid ground plane on the bottom layer and a thermal relief pattern on the top layer to ensure good thermal dissipation. A thermal pad on the bottom of the device should be connected to the ground plane.
To ensure stable output voltage regulation, it is recommended to use a minimum output capacitance of 10uF with an ESR of 100mΩ or less, and to place the output capacitor close to the device. Additionally, a 1uF or larger input capacitor is recommended to filter out input voltage noise.
Although the datasheet specifies a maximum input voltage of 5.5V, it is recommended to limit the input voltage to 5V to ensure reliable operation and to prevent damage to the device.
The power dissipation of the device can be calculated using the formula: Pd = (Vin - Vout) x Iout + (Vin x Iq), where Vin is the input voltage, Vout is the output voltage, Iout is the output current, and Iq is the quiescent current.
The recommended input voltage range for optimal efficiency is between 3.5V and 4.5V. Operating the device outside of this range may result in reduced efficiency and increased power dissipation.
LP5996SD-1833/NOPB datasheet
by Texas Instruments
