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Q: TPS63010 vs. TPS63020 power dissipation by 1579618
The TPS63010 is being used to regulate a 4.5V - 5V rail to 5V @ 1A max. The PCB is 6-layers with 2 GND planes about 3.8" x 1.5" size. The concern is with the TPS63010's ability to dissipate power which is spec'd for approximately a max output current of 2A from the data sheet. The temp spec is 0 to 40C with convection cooling only. They could use the TPS63020 which is spec'd at 4A, but the TPS63010 would save them cost. Will using the TPS63010 in this application be an issue?
A: Re: TPS63010 vs. TPS63020 power dissipation by 1129650
The TPS63010 efficiency for 4.5-5Vin and 5V out at 1A is above 90%. Meaning you will need ~5.5W in to get 5W out. That is 500mW dissipated in the IC. Substituting 40*C for TA in equation 7 of the datasheet allows for 1W of power dissipation to keep the IC junction below 125*C. With proper layout (i.e. customer matches the EVM) the TPS63010 can be evaluated for your application and should work just fine.
The only way to determine actual thermal performance is to build and test it since this is dependent on the system. Please refer to ti.com/thermal for more information.
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