A good PCB layout for the LM4950TS/NOPB involves keeping the analog and digital grounds separate, using a star-ground configuration, and placing the device close to the power supply. Additionally, it's recommended to use a 4-layer PCB with a dedicated ground plane to reduce noise and EMI.
To ensure proper biasing, make sure to connect the BYPASS pin to a 10uF capacitor to ground, and the SHUTDOWN pin to a logic-level signal or a pull-up resistor to VCC. Also, ensure that the input voltage is within the recommended range of 4.5V to 12V.
The maximum power dissipation of the LM4950TS/NOPB is 2.5W. To prevent overheating, ensure good airflow around the device, use a heat sink if necessary, and keep the device away from other heat sources. Also, make sure to follow the recommended thermal design guidelines in the datasheet.
Yes, the LM4950TS/NOPB can be used in battery-powered applications. It has a low quiescent current of 5mA, and a shutdown mode that reduces the current consumption to 10uA. Additionally, the device has a low-dropout voltage regulator, which helps to minimize power loss and extend battery life.
To filter out noise and ripple, use a capacitor in parallel with the output voltage pin (VOUT) and ground. A 10uF ceramic capacitor is recommended. Additionally, consider using a pi-filter or a common-mode filter to further reduce noise and EMI.
LM4950TS/NOPB datasheet
by Texas Instruments
