SNVA962 December   2020 TPSM5601R5H

 

  1.   1
  2.   2
    1.     3
    2.     4
  3.   5
    1.     6
    2.     7
  4.   8
    1.     9
    2.     10
    3.     11
    4.     12
  5.   13
    1.     14
    2.     15
  6.   16
  7.   17
  8.   18

2.2 VIN and VOUT in an Inverting Configuration

When configured in an IBB topology, the voltage across the device is equal to the input voltage minus the output voltage (where the output voltage is a negative value). One must make sure to keep the voltage across the device less than the specified maximum input voltage (VIN_MAX) of the device. The maximum input voltage in an IBB configuration can be calculated by using Equation 5.

Equation 5. GUID-20201102-CA0I-MCV5-SZ46-PCRFDKX6T06M-low.gif

where

  • VIN_MAX(IBB) is the maximum voltage across the device
  • VIN_MAX is the specified maximum input voltage of the device
  • VOUT is the negative output voltage

As a result, in an IBB configuration the input voltage range is reduced. For example, the TPSM5601R5H has an input voltage range of 4.2 V to 60 V. Therefore, for a desired output voltage of –5 V, the input voltage now has an operating range of 4.2 V to 55 V.