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LT8610AC/LT8610AC-1 - 42V, 3.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current

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 VIN 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 VOUT 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.

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 IQ Regulating 12VIN to 3.3VOUT High Efficiency Synchronous Operation: 95% Efficiency at 1A, 5VOUT from 12VIN 93% Efficiency at 1A, 3.3VOUT from 12VIN Low Dropout Under All Conditions: 200mV at 1A Safely Tolerates Inductor Saturation in Overload Adjustable and Synchronizable Frequency:LT8610AC: 200kHz to 2.2MHzLT8610AC-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

Applications Automotive and Industrial Supplies GSM Power Supplies Packaging