A good PCB layout for the TPS51225CRUKR 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 TPS51225CRUKR can operate in an ambient temperature range of -40°C to 125°C. However, the junction temperature should not exceed 150°C.
The power dissipation of the TPS51225CRUKR can be calculated using the formula: Pd = (Vin - Vout) x Iout x Efficiency. The efficiency can be obtained from the datasheet or by measuring the input and output currents and voltages.
The recommended input voltage range for the TPS51225CRUKR is 2.7V to 5.5V. However, the device can operate with input voltages as low as 2.5V, but with reduced performance.
TPS51225CRUKR datasheet
by Texas Instruments
