By Linear Technology 72
Power by Linear™/Analog Devices’ LT3071 is a low voltage, UltraFast™ transient response linear regulator. This regulator supplies up to 5 A of output current with a typical dropout voltage of 85 mV. A 0.01 μF reference bypass capacitor decreases output voltage noise to 25 μVRMS. The LT3071’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost.
Output voltage is digitally selectable in 50 mV increments over a 0.8 V to 1.8 V range. An analog margining function allows the user to adjust system output voltage over a continuous ±10% range. The IC incorporates a unique tracking function to control a buck regulator powering the LT3071’s input. This tracking function drives the buck regulator to maintain the LT3071’s input voltage to VOUT + 300 mV, minimizing power dissipation.
Internal protection includes UVLO, reverse-current protection, precision current limiting with power foldback, and thermal shutdown. The LT3071’s features make it ideal for high-performance FPGAs, microprocessors, or sensitive communication supply applications.
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