Fairchild Semiconductor’s IntelliMAX™ Load Switches Simplify Complex Power Design Challenges

Designers of higher-complexity consumer applications like set-top boxes, ultra-mobile PCs, mobile internet devices and eBooks need a power switch solution that can handle the battery management and green energy challenges associated with the higher load currents, lower supply voltages, larger batteries and more dynamic operating conditions found in these applications.

Fairchild Semiconductor’s (NYSE: FCS) FPF1038 / FPF1039 advanced load management switches provide a monolithic, one-chip solution to the designers’ challenge of reducing in-rush current, or high di/dt, when a switch is used to disconnect loads with high (>100µF) output capacitances. If the load is connected directly to a battery or power supply using a conventional MOSFET/discrete solution, the tolerances of discrete components can create conditions where excessive droop can cause voltage rails to go out of regulation as the switch turns on and draws large currents. The FPF1038 / FPF1039 prevents this from occurring by integrating the necessary functionality into one chip, requiring less board space, reducing part counts, eliminating tolerance matching issues and additional design time to compensate the circuitry.

The FPF1038 / FPF1039 integrates a slew-rate controlled low-impedance MOSFET switch (21mΩ typical) and other features useful in embedded applications: ultra-low power consumption (

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