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

VSET

Using the MODE/S-CONF pin in conjunction with the FB/VSET pin, can be used to save an additional one or two resistors when setting the output voltage. Typically, to set an output voltage, a resistor divider is used on the feedback pin. The advantage to using the resistor divider is flexibility to choose any output value in the output voltage range. Both the TPS82130 and TPSM8290x have the ability to use a resistor divider to configure the Vout. Several applications use common voltages at point of load, so TPSM8290x has added the ability to select an output value from one of 16 common voltages preset options through the VSET function. These values vary from 0.4 V to 5.5 V. If one of those preset output voltages is desired for a design, the VSET function can be used to save one or even both resistors (if left floating or grounded) when configuring the output voltage, as shown in Figure 3-3. The resulting total solution size is 25 mm2.

Figure 3-3 Configuration for the Smallest Solution Size Using TPSM8290x