LT8645S-2 Datasheet

• Silent Switcher^® Architecture
  • Ultralow EMI Emissions
  • Optional Spread Spectrum Modulation
• • Up to 95% Efficiency at 1MHz, 12V_IN to 5V_OUT
  • Up to 94% Efficiency at 2MHz, 12V_IN to 5V_OUT
• Wide Input Voltage Range: 3.4V to 65V
• 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: 40ns
• Low Dropout Under All Conditions: 60mV at 1A
• Adjustable and Synchronizable: 200kHz to 2.2MHz
• Peak Current Mode Operation
• Output Soft-Start and Tracking
• Small 32-Lead 6mm × 4mm LQFN Package
• AEC-Q100 Qualification In Progress

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

The LT8645S-2 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This performance makes the LT8645S-2 ideal for noise sensitive applications and environments.

The fast, clean, low-overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 40ns minimum on-time allows high step-down ratios even at high switching frequencies. 

Burst Mode^® operation enables ultralow standby current consumption, pulse-skipping mode allows full switching frequency at lower output loads, or spread spectrum operation can further reduce EMI emissions.