18V, 3A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

The LT83203/LT83205 synchronous step-down 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 provides 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.

Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies.

The LT83203/LT83205 is ideal for high-current, noise-sensitive applications that benefit from the high efficiency of a synchronous switching regulator.

APPLICATIONS

* RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs

* High Speed/High Precision ADCs/DACs

* Low Noise Instrumentation

* General Purpose Power Supply

* Silent Switcher® 3 Architecture

* Ultra-Low RMS Noise (10Hz to 100kHz): 4μVRMS

* Ultra-Low Spot Noise: 4nV/√Hz at 10kHz

* Ultra-Low EMI Emissions

* Ultra-Fast Transient Response

* <1μs Transient Recovery Time

* High Efficiency at High Frequency

* Up to 93% Efficiency at 2MHz, 12VIN to 3.3VOUT

* Up to 90% Efficiency at 4MHz, 12VIN to 3.3VOUT

* Input Voltage Range: 2.8V to 18V

* Output Voltage Range: 0V to (VIN − 0.5V)

* Unity Gain Configuration up to 13V Output