Features

• LT8610 Feature Set, Plus:
  3V Minimum Input Voltage
  800mV Feedback Voltage
  3.5A Maximum Output Current
  Fast 30ns Minimum Switch-On Time
  Improved Burst Mode Efficiency
  Improved EMI
• Wide Input Voltage Range: 3V to 42V
• Ultralow Quiescent Current Burst Mode® Operation:
  2.5μA I_Q Regulating 12V_IN to 3.3V_OUT
• High Efficiency Synchronous Operation:
  95% Efficiency at 1A, 5V_OUT from 12V_IN
  93% Efficiency at 1A, 3.3V_OUT from 12V_IN
• Low Dropout Under All Conditions: 200mV at 1A
• Safely Tolerates Inductor Saturation in Overload
• Adjustable and Synchronizable Frequency:
  LT8610AC: 200kHz to 2.2MHz
  LT8610AC-1: 1.5MHz to 2.2MHz
• Accurate 1.015V Enable Pin Threshold
• Output Soft-Start and Tracking
• Small Thermally Enhanced 16-Lead MSOP Package

Typical Application

Description

The LT®8610AC/LT8610AC-1 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current. Compared to the LT8610AB, the LT8610AC/LT8610AC-1 has a lower feedback voltage of 800mV and a lower minimum V_IN of 3V. The LT8610AC/LT8610AC-1 has the same additional features of the LT8610AB as compared to the LT8610: higher maximum output current of 3.5A, faster minimum on time of 30ns, and higher light load efficiency.

The LT8610AC/LT8610AC-1 has a SYNC pin for synchronization to an external clock. A capacitor on the TR/ SS pin programs the output voltage ramp rate during startup. The PG flag signals when V_OUT is within ±8% of the programmed output voltage as well as fault conditions. The LT8610AC-1 has internal compensation optimized for high switching frequencies resulting in improved transient response compared to the LT8610AC. The LT8610AC-1 also has a feature which will soft-start the part when exiting dropout or brownout conditions reducing output voltage overshoot.