LD2981

Application notes

DocID6279 Rev 17

17/27

7.6

Reverse current

The power transistor used in the LD2981 has not an inherent diode connected between the

regulator input and output. If the output is forced above the input, no current will flow from

the output to the input across the series pass transistor. When a VREV voltage is applied on

the output, the reverse current measured, according to the test circuit in Figure 22:

"Reverse current test circuit", flows to the GND across the two feedback resistors. This

current typical value is 160 μA. R1 and R2 resistors are implanted type; typical values are,

respectively, 42.6 kΩ and 51.150 kΩ.

Figure 22: Reverse current test circuit