Features

• LT8610 Feature Set, Plus:
  3.5A Maximum Output Current
  Fast 30ns Minimum Switch-On Time
  Improved Burst Mode Efficiency (LT8610AB Only)
  Improved EMI
• Wide Input Voltage Range: 3.4V to 42V
• Ultralow Quiescent Current Burst Mode® Operation:
  2.5μA I_Q Regulating 12V_IN to 3.3V_OUT
• Fixed Output Voltages: 3.3V, 5V
• Output Ripple < 10mV_P-P (LT8610A Only)
• 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:
  200kHz to 2.2MHz
• Accurate 1V Enable Pin Threshold
• Output Soft-Start and Tracking
• Small Thermally Enhanced 16-Lead MSOP Package

Typical Application

Description

The LT®8610A/LT8610AB series are compact, high efficiency, high speed synchronous monolithic step-down switching regulators that consume only 2.5μA of quiescent current. Compared to the LT8610, they have higher maximum output currents of 3.5A and a faster minimum switch-on time of 30ns. The LT8610A has the same low ripple burst mode performance of the LT8610, while the LT8610AB has even higher light load efficiency.

The other features of the LT8610 remain unchanged in the LT8610A/LT8610AB series. A SYNC pin allows synchronization to an external clock. The EN/UV pin has an accurate 1V threshold for V_IN undervoltage lockout or shut down. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup. The PG flag signals when V_OUT is within ±9% of the programmed output voltage as well as fault conditions.