SLVAFA9 March   2022 TPS82130 , TPSM82903

 

  1.   Trademarks
  2. 1Introduction
  3. 2Power Density
  4. 3Achieving a Smaller Solution
    1. 3.1 Fewer External Components
    2. 3.2 Smart Configuration Pin
    3. 3.3 VSET
  5. 4Reducing Power Loss
    1. 4.1 Junction Temperature
    2. 4.2 Automatic Efficiency Enhancement (AEE™)
    3. 4.3 Switching Frequencies and FET RDS(ON)
    4. 4.4 Auto PFM/PWM vs. Forced PWM
  6. 5Application Flexibility
    1. 5.1 Quiescent Current
    2. 5.2 Lower and More Accurate Output Voltages
    3. 5.3 Capacitive Discharge
  7. 6Summary
  8. 7References

4.1 Junction Temperature

The TPSM8290x has extended the junction temperature to 125°C vs. the 110°C of the TPS82130 for a maximum life time of the device. This allows the device to be used at higher ambient temperatures with higher loads. With the 46.1°C/W RӨJA of the TPS821x0, and with an ambient temperature of 65° C, the device is allowed to dissipate less than 1 W of power to reach the max junction temperature of 110°C. Whereas, the TPSM82903, has more than 1.25 W of allowable power to dissipate before the max junction temperature of 125°C is reached. This contributes to how much load the device can deliver under the same ambient temperature, VIN, and VOUT condition. Also, note that the TPSM82903 has better efficiency and has an option to run at 1 MHz (less switching losses).

For example, if we compare the two devices under the same conditions, 12-V input, 1.2-V output, and 60°C ambient. The TPS82130 can deliver only approximately 2.1 A whereas the TPSM82903 can deliver 3 A before the max junction temperature is reached. For the TPS82130 to deliver full load of 3 A, the ambient temperature has to be reduced to 45°C.