A good PCB layout for the TPS51218DSCR involves placing the input capacitors close to the VIN pin, using a solid ground plane, and keeping the high-current paths short and wide. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
Choose input capacitors with a voltage rating of at least 1.5 times the maximum input voltage, and an ESR of less than 1 ohm. For output capacitors, choose ones with a voltage rating of at least 1.5 times the output voltage, and an ESR of less than 0.1 ohm. X5R or X7R ceramic capacitors are recommended.
The TPS51218DSCR can operate in an ambient temperature range of -40°C to 85°C. However, the junction temperature should not exceed 125°C.
The power dissipation of the TPS51218DSCR can be calculated using the formula: Pd = (VIN x IIN) - (VOUT x IOUT). The junction temperature can be estimated using the thermal resistance (RθJA) and the power dissipation.
The recommended input voltage range for the TPS51218DSCR is 2.7V to 5.5V. However, the device can operate with input voltages as low as 2.3V, but with reduced performance.
TPS51218DSCR datasheet
by Texas Instruments
