LT3071 5 A Programmable Output LDO Regulator

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 μV_RMS. 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 V_OUT + 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.

Features
Digitally programmable VOUT: 0.8 V to 1.8 V Output current: 5 A Dropout voltage: 85 mV typical Analog output margining: ±10% range Low output noise: 25 μVRMS (10 Hz to 100 kHz) Parallel multiple devices for 10 A or more Precision current limit: ±20% Output current monitor: IMON = IOUT/2,500 ±1% accuracy over line, load, and temperature		Stable with low ESR ceramic output capacitors (15 μF min.) High-frequency PSRR: 30 dB at 1 MHz Enable function turns output on/off VIOC pin controls buck converter to maintain low power dissipation and optimize efficiency PWRGD/UVLO/thermal shutdown flag Current limit with foldback protection Thermal shutdown
Applications
FPGA, DSP, ASIC, microprocessor power supplies Servers/data storage		Post buck regulation and supply isolation