LT8640-1 Datasheet

• Silent Switcher^® Architecture
  • Ultralow EMI Emissions
  • Spread Spectrum Frequency Modulation
• High Efficiency at High Frequency
  • Up to 96% Efficiency at 1MHz, 12V_IN to 5V_OUT
  • Up to 95% Efficiency at 2MHz, 12V_IN to 5V_OUT
• Wide Input Voltage Range: 3.4V to 42V
• 5A Maximum Continuous Output, 7A Peak Transient Output
• Ultralow Quiescent Current Burst Mode^® Operation
  • 2.5µA I_Q Regulating 12V_IN to 3.3V_OUT
  • Output Ripple < 10mV_P-P
• Fast Minimum Switch On-Time: 30ns
• Low Dropout Under All Conditions: 100mV at 1A
• Forced Continuous Mode
• Safely Tolerates Inductor Saturation in Overload
• Adjustable and Synchronizable: 200kHz to 3MHz
• Peak Current Mode Operation
• Output Soft-Start and Tracking
• Small 18-Lead 3mm × 4mm QFN and Side Wettable QFN
• AEC-Q100 Qualified for Automotive Applications

• Automotive and Industrial Supplies
• General Purpose Step-Down
• GSM Power Supplies

The LT8640-1 step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents.

The LT8640-1 allows high V_IN to low V_OUT conversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and forced continuous mode (LT8640-1).