LT8608 Datasheet

• Wide Input Voltage Range: 3.0V to 42V
• Ultralow Quiescent Current Burst Mode^® Operation:
  • <2.5μA I_Q Regulating 12V_IN to 3.3V_OUT
  • Output Ripple <10mV_P-P
• High Efficiency 2MHz Synchronous Operation:
  • >92% Efficiency at 0.5A, 5V_OUT from 12V_IN
• 1.5A Continuous Output Current
• Fast Minimum Switch-On Time: 35ns
• Adjustable and Synchronizable: 200kHz to 2.2MHz
• Spread Spectrum Frequency Modulation for Low EMI
• Allows Use of Small Inductors
• Low Dropout
• Peak Current Mode Operation
• Accurate 1V Enable Pin Threshold
• Internal Compensation
• Output Soft-Start and Tracking
• Small 10-Lead MSOP Package or 8-Lead 2mm × 2mm DFN Package
• AEC-Q100 Qualified for Automotive Applications

• General Purpose Step Down
• Low EMI Step Down

The LT8608 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 1.7µA of quiescent current. The LT8608 can deliver 1.5A of continuous current. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mV. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/ UV pin has an accurate 1V threshold and can be used to program V_IN undervoltage lockout or to shut down the LT8608. The PG flag signals when V_OUT is within ±8.5% of the programmed output voltage as well as fault conditions.

The MSOP package includes a SYNC pin to synchronize to an external clock, or to select Burst Mode operation or pulse-skipping with or without spread-spectrum; the TR/SS pin programs soft-start or tracking. The DFN package omits these pins and can be purchased in pulse-skipping or Burst Mode operation varieties.