LT8618C Datasheet

• High Efficiency Synchronous Operation
  • > 90% Efficiency at 30mA, 12V_IN to 3.3V_OUT
• Pin Selectable Forced Continuous or Burst Mode^® Operation
• Ultralow Quiescent Current Burst Mode Operation
  • < 2.5μA I_Q Regulating 48V_IN to 3.3V_OUT
  • Output Ripple < 10mV_P-P
• 3.4V to 60V Input Operation Range (65V Max)
• Fast Minimum Switch-On Time: 35ns
• Adjustable And Synchronizable Switching Frequency: 200kHz to 2.2MHz
• Accurate 1V Enable Pin Threshold with Adjustable Hysteresis
• Internal Compensation
• Output Soft-Start and Tracking
• Small 12-Lead 2mm × 2mm LQFN Packages

• Industrial Sensors
• Industrial Internet of Things
• 4mA to 20mA Current Loops
• Flow Meters
• Automotive Housekeeping Supplies

The LT8618 family are compact, high speed synchronous monolithic step-down switching regulators that deliver up to 100mA to the output with high efficiency at a constant frequency, even up to 2.2MHz. They accept a wide input voltage range up to 65V (transients only, 60V for continuous operation), and consume only 2.5μA of quiescent current when operating in Burst Mode. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.

The LT8618C includes BST and INTV_CC ceramic capacitors for a more compact solution while having SYNC/MODE and HYST pins. The SYNC/MODE pin selects the regulator’s operation between forced continuous mode, for predictive interference in sampling systems, Burst Mode, for increased efficiency at light loads or spread spectrum for Low EMI. It also allows synchronization to an external clock to further increase signal to noise ratio in high-resolution acquisition systems.

A PG flag signals when V_OUT is within ±7.5% of the programmed output voltage and when in fault conditions. Thermal shutdown provides additional protection.