Circuit designers looking for a simple and inexpensive method of disabling low-voltage power rails will benefit from the guaranteed low on-state resistance ( RDS(ON)) of these MOSFETs under low gate drive conditions. This enables power rails down to 1.5V to be switched with minimal conduction losses. The DMP1022UFDF has an RDS(ON) of <20mO with a -2.5V gate drive, while the DMP2021UFDF achieves <26mO at -1.8V gate drive. Switching off power to idle processor cores and other inactive circuitry using MOSFETs as high-side load switches is said to be an effective way of extending battery life.
Equally important for space-critical applications is the 2 x 2 x 0.6mm DFN2020 package. It also features an exposed drain pad with a thermal resistance of <10°C/W from junction to pad to assist in extracting heat from the package, reducing die temperature and increasing device reliability.
