Typical application schematic

AN2650

8/26

DocID14109 Rev 3

1.2

Low drop reverse polarity protection

Figure 2. Low drop reverse polarity protection

As shown in Figure 2 the charge pump pin can be used for a low drop reverse polarity

protection. The charge pump pin can also be used for other devices in the same application.

Because of the additional gate capacity, the charge pump ramps up more slowly than

without the additional MOSFET gate.

V

bat

100n

C

buffer

310

22

16

15

Vs

CP

Vs

Vs

L9942

STD17NF03LT4

100k

100k

L9942

Vreg