Analog Devices Inc. LT1963A Low-Noise Low Dropout Regulators

Analog Devices LT1963A Low-Noise Low Dropout Regulators are optimized for fast transient response. The devices are capable of supplying 1.5A of output current with a dropout voltage of 340mV. The operating quiescent current is 1mA, dropping to < 1μA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to the fast transient response, the LT1963A regulators have very low output noise, making them ideal for sensitive RF supply applications.

The output voltage range is from 1.21V to 20V. The LT1963A regulators are stable with output capacitors as low as 10μF. Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting, and reverse current protection. The devices are available in fixed output voltages of 1.5V, 1.8V, 2.5V, and 3.3V and as an adjustable device with a 1.21V reference voltage. The LT1963A regulators are available in 5-lead TO-220, DD, 3-lead SOT-223, 8-lead SO, and 16-lead TSSOP packages.


  • Optimized for fast transient response
  • 1.5A Output current
  • 340mV Dropout voltage
  • 40μVRMS (10Hz to 100kHz) Low noise
  • 1mA Quiescent current
  • No protection diodes needed
  • Controlled quiescent current in dropout
  • 1.5V, 1.8V, 2.5V, 3.3V Fixed output voltages
  • Adjustable output from 1.21V to 20V
  • <1μA Quiescent current in shutdown
  • Stable with 10μF output capacitor
  • Stable with ceramic capacitors
  • Reverse battery protection
  • No reverse current
  • Thermal limiting
  • 5-Lead TO-220, DD, 3-lead SOT-223 and 8-lead SO packages


  • 3.3V to 2.5V Logic power supplies
  • Post regulator for switching supplies

Typical Application

Application Circuit Diagram - Analog Devices Inc. LT1963A Low-Noise Low Dropout Regulators
Publicado: 2019-04-10 | Atualizado: 2023-09-25