FEATURES

 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

 Maximum Continuous Output Current

 LT83203: 3A

 LT83205: 5A

 Fast Minimum Switch On-Time: 15ns

 Adjustable and Synchronizable: 300kHz to 6MHz

 Precision Reference: ±0.7% Over Temperature

with Remote Sense

 Supports Dynamic Output Voltage Control

 Pin Selectable Forced Continuous Mode or

Pulse-Skipping Mode

 Programmable Power Good

 Tiny 15-Lead 3mm × 2mm LFCSP Package

 Pin-to-Pin Compatible Family: LT83201 (1A),

LT83203 (3A), LT83205 (5A)

GENERAL DESCRIPTION

The LT®83203/LT®83205 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, noisesensitive

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