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Analog Devices Inc. LT3077 Low Voltage/Ultra-Fast Linear Regulators

Analog Devices LT3077 Low Voltage/Ultra-Fast Linear Regulators are 5.5V, 3A, ultra-low noise, high PSRR, 85mV dropout, ultra-fast linear regulators. The Analog Devices LT3077 regulators supply up to 3A with a typical dropout voltage of 85mV. A 4.7µF reference bypass capacitor decreases output voltage noise to 1.2µVRMS. The wide bandwidth and high PSRR permit the use of small ceramic capacitors, saving bulk capacitance and cost. Available in a compact 18-lead (3mm x 3mm) LFCSP-RT package, the LT3077 is ideal for powering high-performance FPGAs, data converters, RF, and noise-sensitive signal chain applications.

The output voltage is digitally selectable in 50mV increments from 0.5V to 1.2V, 100mV increments from 1.2V to 1.8V, and discrete levels at 2V, 2.5V, 3V, 3.3V, and 4.2V. The LT3077’s unity-gain operation provides virtually constant output noise, PSRR, and bandwidth independent of the programmed output voltage. Precision current limiting allows users to minimize input power supply size and cost. Built-in protection includes Undervoltage Lockout (UVLO), internal current limit, and thermal shutdown with hysteresis.

Features

  • Ultra-low 1.2μVRMS noise (10Hz to 100kHz)
  • Ultra-low 3.5nV/√ spot noise at 10kHz
  • Ultra-low 7µVP-P 1/f  noise from 0.1Hz to 10Hz
  • High-frequency 50dB PSRR at 1MHz
  • Ultra-fast transient response
  • 85mV typical dropout voltage
  • 0.5V to 4.2V digitally programmable VOUT range
  • ±1.5% output tolerance over line, load, and temperature
  • ±10% programmable output current limit at 3A
  • 0.6V to 5.5V input range
  • Stable with ceramic output capacitors (10μF minimum)
  • Parallel multiple devices for higher current
  • Precision enable/UVLO
  • Power Good (PG) flag
  • 18-lead (3mm x 3mm) LFCSP-RT package
  • -40°C to +125°C operating junction temperature range

Applications

  • RF power supplies (PLLs, VCOs, Mixers, LNAs, and PAs)
  • High-speed/precision data converters
  • Low-noise instrumentation
  • Post-regulator for switching supplies
  • FPGA and DSP power supplies
  • Medical

SIMPLIFIED APPLICATION DIAGRAM

Application Circuit Diagram - Analog Devices Inc. LT3077 Low Voltage/Ultra-Fast Linear Regulators

Functional Block Diagram

Block Diagram - Analog Devices Inc. LT3077 Low Voltage/Ultra-Fast Linear Regulators
Published: 2025-07-07 | Updated: 2025-08-12