AN3399

Evaluations of circuit with PNP and current limitation

Doc ID 018824 Rev 2

9/24

2

Evaluations of circuit with PNP and current limitation

2.1

Static characteristics

2.1.1

Standby current

regulation and current limitation with external PNP transistor (see Figure 1).

The 5V2 voltage regulator was switched OFF by SPI in Active Mode Configuration. There

regulator.

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This current will be significantly decreased by switching the device in V1stby Mode which

turns OFF the operational amplifier (see Figure 5).

Figure 5.

Removing residual current by turning L99PM62GXP in standby mode

Conclusion

A residual current can be observed in the load in case the reference voltage 5V2 is turned

OFF and L99PM62GXP is maintained on active more.

By turning L99PM62GXP in any standby mode (V1stby or Vbatstby), this residual current

will be removed.