LT83401/LT83402: 42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

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 Electromagnetic interference (EMI) emissions while delivering high efficiency at high switching frequencies.
 
The LT83401/LT83402 is ideal for high-current, noise-sensitive applications that benefit from the high efficiency of a synchronous switching regulator.

• Silent Switcher® 3 Architecture
  • Ultra-Low RMS Noise (10Hz–100kHz): 2.8μVRMS
  • Ultra-Low Spot Noise: 4nV/√Hz at 10kHz
  • Ultra-Low EMI Emissions
• Ultra-Fast Transient Response
  • Minimizes the Output Capacitance
• High Efficiency at High Frequency
  • Up to 92.4% Efficiency at 2MHz, 12VIN to 5VOUT
• Input Voltage Range: 2.8V to 42V
• Output Voltage Range: 0V to (VIN - 1V)
  • Unity Gain Configuration Up to 15VOUT
• Maximum DC Output Current:
  • LT83401: 1A
  • LT83402: 2.5A
• Peak Switch Current Limit:
  • LT83401: 2.2A
  • LT83402: 4.0A
• Valley Switch Current Limit:
  • LT83401: 1.5A
  • LT83402: 2.4A
• Fast Minimum Switch On-Time: 22ns
• Precision Reference: ±0.8% Over Temperature with Remote Sense
• Forced Continuous Mode Capability
• Adjustable and Synchronizable: 300kHz to 6MHz
• Programmable Power Good
• Tiny, 15-Lead 3mm x 2mm LFCSP Package
• Pin-to-Pin Compatible Family: LT83201 (18V, 1A), LT83203 (18V, 3A), and LT83205 (18V, 5A)
• AEC-Q100 Qualified for Automotive Applications

• Automotive and Industrial Power Supplies
• Medical Applications: Imaging and Diagnostics
• High-Speed and High-Precision Data Converters
• Bipolar, Very Low-Noise Power Supplies
• Low-Noise Instrumentation and Displays