6.1.1

MOSFET reference information

The external MOSFET realizing the hot swap and oring functions, must be properly chosen considering the

application requirements, in terms of current and voltages, and all the STPM801 parameters related to HGATE

and DGATE driving.

On the product application note more details about the choice of external FETs are described.

6.1.2

Dual line application scenario

Device can also be used in double line application, as shown in the Figure 19.

Figure 19. Double line application

The two-lines scheme is useful when a second battery supply line is recommended as auxiliary line in case the

main battery is not available anymore (under voltage condition or any other malfunction).

In this way the voltage on the output line is the OR of the supply voltages of the two single lines. The higher

voltage supply is transferred to the output line; on the other line a reverse condition is detected by STPM801,

oring MOSFET is switched OFF, avoiding current back feeding from OUT to VB.

STPM801

Applications information

DS13990 - Rev 2

page 30/38