LT3071 5 A Programmable Output LDO Regulator

By Linear Technology 53

LT3071 5 A Programmable Output LDO Regulator

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.


 
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

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