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Analog Devices Inc. LT83201 Step-Down Ultra-Low Noise Regulator

Analog Devices LT83201 Step-Down Ultra-Low Noise Regulator is uniquely designed to combine an ultra-low noise reference with Silent Switcher® architecture to achieve both high efficiency and excellent wideband noise performance. The innovative ultra-low noise architecture allows exceptional low-frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage.

The Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies. The Analog Devices LT83201 is ideal for noise-sensitive applications that benefit from the high efficiency of a synchronous switching regulator.

Features

  • Silent Switcher 3 architecture
    • Ultra-low RMS noise (10Hz to 100kHz) of 4μVRMS
    • Ultra-low spot noise of 4nV/√Hz at 10kHz
    • Ultra-low EMI emissions
  • Ultra-fast transient response of <1μs transient recovery time
  • High efficiency at high frequency
    • Up to 94% efficiency at 2MHz, 12VIN to 5VOUT
    • Up to 92% efficiency at 4MHz, 12VIN to 5VOUT
  • 2.8V to 18V input voltage range
  • 0V to (VIN to 0.5V) output voltage range with unity gain configuration up to 13V output
  • 1A maximum continuous output current
  • 13ns fast minimum switch-on time
  • Adjustable and synchronizable from 300kHz to 6MHz
  • Precision reference of ±0.6% over temperature with remote sense
  • Pin selectable Forced Continuous Mode (FCM) or Discontinuous Conduction Mode (DCM) during operation
  • Full frequency discontinuous conduction at light loads in DCM for higher efficiency and predictable noise
  • Supports dynamic output voltage control
  • Programmable Power Good
  • Tiny 15-lead 3mm × 2mm LFCSP package
  • Pin-to-pin compatible family with LT83201 (1A), LT83203 (3A), and LT83205 (5A)

Applications

  • RF power supplies (PLLs, VCOs, mixers, LNAs, and PAs)
  • Low-noise instrumentation
  • High-speed/high-precision ADCs/DACs
  • General-purpose power supply

Typical Application

Application Circuit Diagram - Analog Devices Inc. LT83201 Step-Down Ultra-Low Noise Regulator
Published: 2025-06-03 | Updated: 2025-06-11