IntelliMAXT load switches simplify complex power design challenges

San Jose, Calif. – Fairchild Semiconductor is offering advanced load management switches dubbed FPF1038/FPF1039, which 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 in which 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 functions into one chip, requiring less board space, reducing part counts, eliminating tolerance matching issues and additional design time to compensate the circuitry, according to Fairchild.

The FPF1038/FPF1039 integrate a slew-rate controlled low-impedance MOSFET switch (21mO typical) and other features useful in embedded applications: low power consumption (<1µA), load discharge path, ESD protection, GPIO/CMOS compatible-enable circuitry. The devices also features a 1.2V to 5.5V input voltage operating range, which aligns with supply rails for the latest embedded processors, custom ASICs, and FPGAs used in these applications. The optimized slew-rate controlled turn-on characteristics with TR=2.7mS prevent voltage droop on supply rails with bulk capacitances as large as 200µF. Pricing: $.60 in 1,000 quantity pieces.
Availability: Samples available now; delivery is 8 to 10 weeks ARO.

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