LT83203 Datasheet

• Silent Switcher^® 3 Architecture
  • Ultra-Low RMS Noise (10Hz to 100kHz): 4μV_RMS
  • 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, 12V_IN to 3.3V_OUT
  • Up to 90% Efficiency at 4MHz, 12V_IN to 3.3V_OUT
• Input Voltage Range: 2.8V to 18V
• Output Voltage Range: 0V to (V_IN − 0.5V)
  • Unity Gain Configuration up to 13V Output
• Maximum Continuous Output Current
  • LT83203: 3A
• 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)

• RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
• High Speed/High Precision ADCs/DACs
• Low Noise Instrumentation
• General Purpose Power Supply

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